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1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth HCI connection handling. */
26
27#include <linux/export.h>
28#include <linux/debugfs.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32#include <net/bluetooth/l2cap.h>
33
34#include "hci_request.h"
35#include "smp.h"
36#include "a2mp.h"
37
38struct sco_param {
39 u16 pkt_type;
40 u16 max_latency;
41 u8 retrans_effort;
42};
43
44static const struct sco_param esco_param_cvsd[] = {
45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
50};
51
52static const struct sco_param sco_param_cvsd[] = {
53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
55};
56
57static const struct sco_param esco_param_msbc[] = {
58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
60};
61
62/* This function requires the caller holds hdev->lock */
63static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
64{
65 struct hci_conn_params *params;
66 struct hci_dev *hdev = conn->hdev;
67 struct smp_irk *irk;
68 bdaddr_t *bdaddr;
69 u8 bdaddr_type;
70
71 bdaddr = &conn->dst;
72 bdaddr_type = conn->dst_type;
73
74 /* Check if we need to convert to identity address */
75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
76 if (irk) {
77 bdaddr = &irk->bdaddr;
78 bdaddr_type = irk->addr_type;
79 }
80
81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
82 bdaddr_type);
83 if (!params || !params->explicit_connect)
84 return;
85
86 /* The connection attempt was doing scan for new RPA, and is
87 * in scan phase. If params are not associated with any other
88 * autoconnect action, remove them completely. If they are, just unmark
89 * them as waiting for connection, by clearing explicit_connect field.
90 */
91 params->explicit_connect = false;
92
93 list_del_init(¶ms->action);
94
95 switch (params->auto_connect) {
96 case HCI_AUTO_CONN_EXPLICIT:
97 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
98 /* return instead of break to avoid duplicate scan update */
99 return;
100 case HCI_AUTO_CONN_DIRECT:
101 case HCI_AUTO_CONN_ALWAYS:
102 list_add(¶ms->action, &hdev->pend_le_conns);
103 break;
104 case HCI_AUTO_CONN_REPORT:
105 list_add(¶ms->action, &hdev->pend_le_reports);
106 break;
107 default:
108 break;
109 }
110
111 hci_update_background_scan(hdev);
112}
113
114static void hci_conn_cleanup(struct hci_conn *conn)
115{
116 struct hci_dev *hdev = conn->hdev;
117
118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
120
121 hci_chan_list_flush(conn);
122
123 hci_conn_hash_del(hdev, conn);
124
125 if (hdev->notify)
126 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
127
128 hci_conn_del_sysfs(conn);
129
130 debugfs_remove_recursive(conn->debugfs);
131
132 hci_dev_put(hdev);
133
134 hci_conn_put(conn);
135}
136
137static void le_scan_cleanup(struct work_struct *work)
138{
139 struct hci_conn *conn = container_of(work, struct hci_conn,
140 le_scan_cleanup);
141 struct hci_dev *hdev = conn->hdev;
142 struct hci_conn *c = NULL;
143
144 BT_DBG("%s hcon %p", hdev->name, conn);
145
146 hci_dev_lock(hdev);
147
148 /* Check that the hci_conn is still around */
149 rcu_read_lock();
150 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
151 if (c == conn)
152 break;
153 }
154 rcu_read_unlock();
155
156 if (c == conn) {
157 hci_connect_le_scan_cleanup(conn);
158 hci_conn_cleanup(conn);
159 }
160
161 hci_dev_unlock(hdev);
162 hci_dev_put(hdev);
163 hci_conn_put(conn);
164}
165
166static void hci_connect_le_scan_remove(struct hci_conn *conn)
167{
168 BT_DBG("%s hcon %p", conn->hdev->name, conn);
169
170 /* We can't call hci_conn_del/hci_conn_cleanup here since that
171 * could deadlock with another hci_conn_del() call that's holding
172 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
173 * Instead, grab temporary extra references to the hci_dev and
174 * hci_conn and perform the necessary cleanup in a separate work
175 * callback.
176 */
177
178 hci_dev_hold(conn->hdev);
179 hci_conn_get(conn);
180
181 /* Even though we hold a reference to the hdev, many other
182 * things might get cleaned up meanwhile, including the hdev's
183 * own workqueue, so we can't use that for scheduling.
184 */
185 schedule_work(&conn->le_scan_cleanup);
186}
187
188static void hci_acl_create_connection(struct hci_conn *conn)
189{
190 struct hci_dev *hdev = conn->hdev;
191 struct inquiry_entry *ie;
192 struct hci_cp_create_conn cp;
193
194 BT_DBG("hcon %p", conn);
195
196 conn->state = BT_CONNECT;
197 conn->out = true;
198 conn->role = HCI_ROLE_MASTER;
199
200 conn->attempt++;
201
202 conn->link_policy = hdev->link_policy;
203
204 memset(&cp, 0, sizeof(cp));
205 bacpy(&cp.bdaddr, &conn->dst);
206 cp.pscan_rep_mode = 0x02;
207
208 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
209 if (ie) {
210 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
211 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
212 cp.pscan_mode = ie->data.pscan_mode;
213 cp.clock_offset = ie->data.clock_offset |
214 cpu_to_le16(0x8000);
215 }
216
217 memcpy(conn->dev_class, ie->data.dev_class, 3);
218 if (ie->data.ssp_mode > 0)
219 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
220 }
221
222 cp.pkt_type = cpu_to_le16(conn->pkt_type);
223 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
224 cp.role_switch = 0x01;
225 else
226 cp.role_switch = 0x00;
227
228 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
229}
230
231int hci_disconnect(struct hci_conn *conn, __u8 reason)
232{
233 BT_DBG("hcon %p", conn);
234
235 /* When we are master of an established connection and it enters
236 * the disconnect timeout, then go ahead and try to read the
237 * current clock offset. Processing of the result is done
238 * within the event handling and hci_clock_offset_evt function.
239 */
240 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
241 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
242 struct hci_dev *hdev = conn->hdev;
243 struct hci_cp_read_clock_offset clkoff_cp;
244
245 clkoff_cp.handle = cpu_to_le16(conn->handle);
246 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
247 &clkoff_cp);
248 }
249
250 return hci_abort_conn(conn, reason);
251}
252
253static void hci_add_sco(struct hci_conn *conn, __u16 handle)
254{
255 struct hci_dev *hdev = conn->hdev;
256 struct hci_cp_add_sco cp;
257
258 BT_DBG("hcon %p", conn);
259
260 conn->state = BT_CONNECT;
261 conn->out = true;
262
263 conn->attempt++;
264
265 cp.handle = cpu_to_le16(handle);
266 cp.pkt_type = cpu_to_le16(conn->pkt_type);
267
268 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
269}
270
271bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
272{
273 struct hci_dev *hdev = conn->hdev;
274 struct hci_cp_setup_sync_conn cp;
275 const struct sco_param *param;
276
277 BT_DBG("hcon %p", conn);
278
279 conn->state = BT_CONNECT;
280 conn->out = true;
281
282 conn->attempt++;
283
284 cp.handle = cpu_to_le16(handle);
285
286 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
287 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
288 cp.voice_setting = cpu_to_le16(conn->setting);
289
290 switch (conn->setting & SCO_AIRMODE_MASK) {
291 case SCO_AIRMODE_TRANSP:
292 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
293 return false;
294 param = &esco_param_msbc[conn->attempt - 1];
295 break;
296 case SCO_AIRMODE_CVSD:
297 if (lmp_esco_capable(conn->link)) {
298 if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
299 return false;
300 param = &esco_param_cvsd[conn->attempt - 1];
301 } else {
302 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
303 return false;
304 param = &sco_param_cvsd[conn->attempt - 1];
305 }
306 break;
307 default:
308 return false;
309 }
310
311 cp.retrans_effort = param->retrans_effort;
312 cp.pkt_type = __cpu_to_le16(param->pkt_type);
313 cp.max_latency = __cpu_to_le16(param->max_latency);
314
315 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
316 return false;
317
318 return true;
319}
320
321u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
322 u16 to_multiplier)
323{
324 struct hci_dev *hdev = conn->hdev;
325 struct hci_conn_params *params;
326 struct hci_cp_le_conn_update cp;
327
328 hci_dev_lock(hdev);
329
330 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
331 if (params) {
332 params->conn_min_interval = min;
333 params->conn_max_interval = max;
334 params->conn_latency = latency;
335 params->supervision_timeout = to_multiplier;
336 }
337
338 hci_dev_unlock(hdev);
339
340 memset(&cp, 0, sizeof(cp));
341 cp.handle = cpu_to_le16(conn->handle);
342 cp.conn_interval_min = cpu_to_le16(min);
343 cp.conn_interval_max = cpu_to_le16(max);
344 cp.conn_latency = cpu_to_le16(latency);
345 cp.supervision_timeout = cpu_to_le16(to_multiplier);
346 cp.min_ce_len = cpu_to_le16(0x0000);
347 cp.max_ce_len = cpu_to_le16(0x0000);
348
349 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
350
351 if (params)
352 return 0x01;
353
354 return 0x00;
355}
356
357void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
358 __u8 ltk[16], __u8 key_size)
359{
360 struct hci_dev *hdev = conn->hdev;
361 struct hci_cp_le_start_enc cp;
362
363 BT_DBG("hcon %p", conn);
364
365 memset(&cp, 0, sizeof(cp));
366
367 cp.handle = cpu_to_le16(conn->handle);
368 cp.rand = rand;
369 cp.ediv = ediv;
370 memcpy(cp.ltk, ltk, key_size);
371
372 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
373}
374
375/* Device _must_ be locked */
376void hci_sco_setup(struct hci_conn *conn, __u8 status)
377{
378 struct hci_conn *sco = conn->link;
379
380 if (!sco)
381 return;
382
383 BT_DBG("hcon %p", conn);
384
385 if (!status) {
386 if (lmp_esco_capable(conn->hdev))
387 hci_setup_sync(sco, conn->handle);
388 else
389 hci_add_sco(sco, conn->handle);
390 } else {
391 hci_connect_cfm(sco, status);
392 hci_conn_del(sco);
393 }
394}
395
396static void hci_conn_timeout(struct work_struct *work)
397{
398 struct hci_conn *conn = container_of(work, struct hci_conn,
399 disc_work.work);
400 int refcnt = atomic_read(&conn->refcnt);
401
402 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
403
404 WARN_ON(refcnt < 0);
405
406 /* FIXME: It was observed that in pairing failed scenario, refcnt
407 * drops below 0. Probably this is because l2cap_conn_del calls
408 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
409 * dropped. After that loop hci_chan_del is called which also drops
410 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
411 * otherwise drop it.
412 */
413 if (refcnt > 0)
414 return;
415
416 /* LE connections in scanning state need special handling */
417 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
418 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
419 hci_connect_le_scan_remove(conn);
420 return;
421 }
422
423 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
424}
425
426/* Enter sniff mode */
427static void hci_conn_idle(struct work_struct *work)
428{
429 struct hci_conn *conn = container_of(work, struct hci_conn,
430 idle_work.work);
431 struct hci_dev *hdev = conn->hdev;
432
433 BT_DBG("hcon %p mode %d", conn, conn->mode);
434
435 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
436 return;
437
438 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
439 return;
440
441 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
442 struct hci_cp_sniff_subrate cp;
443 cp.handle = cpu_to_le16(conn->handle);
444 cp.max_latency = cpu_to_le16(0);
445 cp.min_remote_timeout = cpu_to_le16(0);
446 cp.min_local_timeout = cpu_to_le16(0);
447 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
448 }
449
450 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
451 struct hci_cp_sniff_mode cp;
452 cp.handle = cpu_to_le16(conn->handle);
453 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
454 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
455 cp.attempt = cpu_to_le16(4);
456 cp.timeout = cpu_to_le16(1);
457 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
458 }
459}
460
461static void hci_conn_auto_accept(struct work_struct *work)
462{
463 struct hci_conn *conn = container_of(work, struct hci_conn,
464 auto_accept_work.work);
465
466 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
467 &conn->dst);
468}
469
470static void le_conn_timeout(struct work_struct *work)
471{
472 struct hci_conn *conn = container_of(work, struct hci_conn,
473 le_conn_timeout.work);
474 struct hci_dev *hdev = conn->hdev;
475
476 BT_DBG("");
477
478 /* We could end up here due to having done directed advertising,
479 * so clean up the state if necessary. This should however only
480 * happen with broken hardware or if low duty cycle was used
481 * (which doesn't have a timeout of its own).
482 */
483 if (conn->role == HCI_ROLE_SLAVE) {
484 u8 enable = 0x00;
485 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
486 &enable);
487 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
488 return;
489 }
490
491 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
492}
493
494struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
495 u8 role)
496{
497 struct hci_conn *conn;
498
499 BT_DBG("%s dst %pMR", hdev->name, dst);
500
501 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
502 if (!conn)
503 return NULL;
504
505 bacpy(&conn->dst, dst);
506 bacpy(&conn->src, &hdev->bdaddr);
507 conn->hdev = hdev;
508 conn->type = type;
509 conn->role = role;
510 conn->mode = HCI_CM_ACTIVE;
511 conn->state = BT_OPEN;
512 conn->auth_type = HCI_AT_GENERAL_BONDING;
513 conn->io_capability = hdev->io_capability;
514 conn->remote_auth = 0xff;
515 conn->key_type = 0xff;
516 conn->rssi = HCI_RSSI_INVALID;
517 conn->tx_power = HCI_TX_POWER_INVALID;
518 conn->max_tx_power = HCI_TX_POWER_INVALID;
519
520 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
521 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
522
523 if (conn->role == HCI_ROLE_MASTER)
524 conn->out = true;
525
526 switch (type) {
527 case ACL_LINK:
528 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
529 break;
530 case LE_LINK:
531 /* conn->src should reflect the local identity address */
532 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
533 break;
534 case SCO_LINK:
535 if (lmp_esco_capable(hdev))
536 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
537 (hdev->esco_type & EDR_ESCO_MASK);
538 else
539 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
540 break;
541 case ESCO_LINK:
542 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
543 break;
544 }
545
546 skb_queue_head_init(&conn->data_q);
547
548 INIT_LIST_HEAD(&conn->chan_list);
549
550 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
551 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
552 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
553 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
554 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
555
556 atomic_set(&conn->refcnt, 0);
557
558 hci_dev_hold(hdev);
559
560 hci_conn_hash_add(hdev, conn);
561 if (hdev->notify)
562 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
563
564 hci_conn_init_sysfs(conn);
565
566 return conn;
567}
568
569int hci_conn_del(struct hci_conn *conn)
570{
571 struct hci_dev *hdev = conn->hdev;
572
573 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
574
575 cancel_delayed_work_sync(&conn->disc_work);
576 cancel_delayed_work_sync(&conn->auto_accept_work);
577 cancel_delayed_work_sync(&conn->idle_work);
578
579 if (conn->type == ACL_LINK) {
580 struct hci_conn *sco = conn->link;
581 if (sco)
582 sco->link = NULL;
583
584 /* Unacked frames */
585 hdev->acl_cnt += conn->sent;
586 } else if (conn->type == LE_LINK) {
587 cancel_delayed_work(&conn->le_conn_timeout);
588
589 if (hdev->le_pkts)
590 hdev->le_cnt += conn->sent;
591 else
592 hdev->acl_cnt += conn->sent;
593 } else {
594 struct hci_conn *acl = conn->link;
595 if (acl) {
596 acl->link = NULL;
597 hci_conn_drop(acl);
598 }
599 }
600
601 if (conn->amp_mgr)
602 amp_mgr_put(conn->amp_mgr);
603
604 skb_queue_purge(&conn->data_q);
605
606 /* Remove the connection from the list and cleanup its remaining
607 * state. This is a separate function since for some cases like
608 * BT_CONNECT_SCAN we *only* want the cleanup part without the
609 * rest of hci_conn_del.
610 */
611 hci_conn_cleanup(conn);
612
613 return 0;
614}
615
616struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
617{
618 int use_src = bacmp(src, BDADDR_ANY);
619 struct hci_dev *hdev = NULL, *d;
620
621 BT_DBG("%pMR -> %pMR", src, dst);
622
623 read_lock(&hci_dev_list_lock);
624
625 list_for_each_entry(d, &hci_dev_list, list) {
626 if (!test_bit(HCI_UP, &d->flags) ||
627 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
628 d->dev_type != HCI_BREDR)
629 continue;
630
631 /* Simple routing:
632 * No source address - find interface with bdaddr != dst
633 * Source address - find interface with bdaddr == src
634 */
635
636 if (use_src) {
637 if (!bacmp(&d->bdaddr, src)) {
638 hdev = d; break;
639 }
640 } else {
641 if (bacmp(&d->bdaddr, dst)) {
642 hdev = d; break;
643 }
644 }
645 }
646
647 if (hdev)
648 hdev = hci_dev_hold(hdev);
649
650 read_unlock(&hci_dev_list_lock);
651 return hdev;
652}
653EXPORT_SYMBOL(hci_get_route);
654
655/* This function requires the caller holds hdev->lock */
656void hci_le_conn_failed(struct hci_conn *conn, u8 status)
657{
658 struct hci_dev *hdev = conn->hdev;
659 struct hci_conn_params *params;
660
661 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
662 conn->dst_type);
663 if (params && params->conn) {
664 hci_conn_drop(params->conn);
665 hci_conn_put(params->conn);
666 params->conn = NULL;
667 }
668
669 conn->state = BT_CLOSED;
670
671 /* If the status indicates successful cancellation of
672 * the attempt (i.e. Unkown Connection Id) there's no point of
673 * notifying failure since we'll go back to keep trying to
674 * connect. The only exception is explicit connect requests
675 * where a timeout + cancel does indicate an actual failure.
676 */
677 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
678 (params && params->explicit_connect))
679 mgmt_connect_failed(hdev, &conn->dst, conn->type,
680 conn->dst_type, status);
681
682 hci_connect_cfm(conn, status);
683
684 hci_conn_del(conn);
685
686 /* Since we may have temporarily stopped the background scanning in
687 * favor of connection establishment, we should restart it.
688 */
689 hci_update_background_scan(hdev);
690
691 /* Re-enable advertising in case this was a failed connection
692 * attempt as a peripheral.
693 */
694 hci_req_reenable_advertising(hdev);
695}
696
697static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
698{
699 struct hci_conn *conn;
700
701 hci_dev_lock(hdev);
702
703 conn = hci_lookup_le_connect(hdev);
704
705 if (!status) {
706 hci_connect_le_scan_cleanup(conn);
707 goto done;
708 }
709
710 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
711 status);
712
713 if (!conn)
714 goto done;
715
716 hci_le_conn_failed(conn, status);
717
718done:
719 hci_dev_unlock(hdev);
720}
721
722static bool conn_use_rpa(struct hci_conn *conn)
723{
724 struct hci_dev *hdev = conn->hdev;
725
726 return hci_dev_test_flag(hdev, HCI_PRIVACY);
727}
728
729static void hci_req_add_le_create_conn(struct hci_request *req,
730 struct hci_conn *conn)
731{
732 struct hci_cp_le_create_conn cp;
733 struct hci_dev *hdev = conn->hdev;
734 u8 own_addr_type;
735
736 /* Update random address, but set require_privacy to false so
737 * that we never connect with an non-resolvable address.
738 */
739 if (hci_update_random_address(req, false, conn_use_rpa(conn),
740 &own_addr_type))
741 return;
742
743 memset(&cp, 0, sizeof(cp));
744
745 /* Set window to be the same value as the interval to enable
746 * continuous scanning.
747 */
748 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
749 cp.scan_window = cp.scan_interval;
750
751 bacpy(&cp.peer_addr, &conn->dst);
752 cp.peer_addr_type = conn->dst_type;
753 cp.own_address_type = own_addr_type;
754 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
755 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
756 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
757 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
758 cp.min_ce_len = cpu_to_le16(0x0000);
759 cp.max_ce_len = cpu_to_le16(0x0000);
760
761 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
762
763 conn->state = BT_CONNECT;
764 clear_bit(HCI_CONN_SCANNING, &conn->flags);
765}
766
767static void hci_req_directed_advertising(struct hci_request *req,
768 struct hci_conn *conn)
769{
770 struct hci_dev *hdev = req->hdev;
771 struct hci_cp_le_set_adv_param cp;
772 u8 own_addr_type;
773 u8 enable;
774
775 /* Clear the HCI_LE_ADV bit temporarily so that the
776 * hci_update_random_address knows that it's safe to go ahead
777 * and write a new random address. The flag will be set back on
778 * as soon as the SET_ADV_ENABLE HCI command completes.
779 */
780 hci_dev_clear_flag(hdev, HCI_LE_ADV);
781
782 /* Set require_privacy to false so that the remote device has a
783 * chance of identifying us.
784 */
785 if (hci_update_random_address(req, false, conn_use_rpa(conn),
786 &own_addr_type) < 0)
787 return;
788
789 memset(&cp, 0, sizeof(cp));
790 cp.type = LE_ADV_DIRECT_IND;
791 cp.own_address_type = own_addr_type;
792 cp.direct_addr_type = conn->dst_type;
793 bacpy(&cp.direct_addr, &conn->dst);
794 cp.channel_map = hdev->le_adv_channel_map;
795
796 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
797
798 enable = 0x01;
799 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
800
801 conn->state = BT_CONNECT;
802}
803
804struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
805 u8 dst_type, u8 sec_level, u16 conn_timeout,
806 u8 role)
807{
808 struct hci_conn_params *params;
809 struct hci_conn *conn;
810 struct smp_irk *irk;
811 struct hci_request req;
812 int err;
813
814 /* Let's make sure that le is enabled.*/
815 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
816 if (lmp_le_capable(hdev))
817 return ERR_PTR(-ECONNREFUSED);
818
819 return ERR_PTR(-EOPNOTSUPP);
820 }
821
822 /* Since the controller supports only one LE connection attempt at a
823 * time, we return -EBUSY if there is any connection attempt running.
824 */
825 if (hci_lookup_le_connect(hdev))
826 return ERR_PTR(-EBUSY);
827
828 /* If there's already a connection object but it's not in
829 * scanning state it means it must already be established, in
830 * which case we can't do anything else except report a failure
831 * to connect.
832 */
833 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
834 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
835 return ERR_PTR(-EBUSY);
836 }
837
838 /* When given an identity address with existing identity
839 * resolving key, the connection needs to be established
840 * to a resolvable random address.
841 *
842 * Storing the resolvable random address is required here
843 * to handle connection failures. The address will later
844 * be resolved back into the original identity address
845 * from the connect request.
846 */
847 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
848 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
849 dst = &irk->rpa;
850 dst_type = ADDR_LE_DEV_RANDOM;
851 }
852
853 if (conn) {
854 bacpy(&conn->dst, dst);
855 } else {
856 conn = hci_conn_add(hdev, LE_LINK, dst, role);
857 if (!conn)
858 return ERR_PTR(-ENOMEM);
859 hci_conn_hold(conn);
860 conn->pending_sec_level = sec_level;
861 }
862
863 conn->dst_type = dst_type;
864 conn->sec_level = BT_SECURITY_LOW;
865 conn->conn_timeout = conn_timeout;
866
867 hci_req_init(&req, hdev);
868
869 /* Disable advertising if we're active. For master role
870 * connections most controllers will refuse to connect if
871 * advertising is enabled, and for slave role connections we
872 * anyway have to disable it in order to start directed
873 * advertising.
874 */
875 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
876 u8 enable = 0x00;
877 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
878 &enable);
879 }
880
881 /* If requested to connect as slave use directed advertising */
882 if (conn->role == HCI_ROLE_SLAVE) {
883 /* If we're active scanning most controllers are unable
884 * to initiate advertising. Simply reject the attempt.
885 */
886 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
887 hdev->le_scan_type == LE_SCAN_ACTIVE) {
888 skb_queue_purge(&req.cmd_q);
889 hci_conn_del(conn);
890 return ERR_PTR(-EBUSY);
891 }
892
893 hci_req_directed_advertising(&req, conn);
894 goto create_conn;
895 }
896
897 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
898 if (params) {
899 conn->le_conn_min_interval = params->conn_min_interval;
900 conn->le_conn_max_interval = params->conn_max_interval;
901 conn->le_conn_latency = params->conn_latency;
902 conn->le_supv_timeout = params->supervision_timeout;
903 } else {
904 conn->le_conn_min_interval = hdev->le_conn_min_interval;
905 conn->le_conn_max_interval = hdev->le_conn_max_interval;
906 conn->le_conn_latency = hdev->le_conn_latency;
907 conn->le_supv_timeout = hdev->le_supv_timeout;
908 }
909
910 /* If controller is scanning, we stop it since some controllers are
911 * not able to scan and connect at the same time. Also set the
912 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
913 * handler for scan disabling knows to set the correct discovery
914 * state.
915 */
916 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
917 hci_req_add_le_scan_disable(&req);
918 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
919 }
920
921 hci_req_add_le_create_conn(&req, conn);
922
923create_conn:
924 err = hci_req_run(&req, create_le_conn_complete);
925 if (err) {
926 hci_conn_del(conn);
927 return ERR_PTR(err);
928 }
929
930 return conn;
931}
932
933static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
934{
935 struct hci_conn *conn;
936
937 conn = hci_conn_hash_lookup_le(hdev, addr, type);
938 if (!conn)
939 return false;
940
941 if (conn->state != BT_CONNECTED)
942 return false;
943
944 return true;
945}
946
947/* This function requires the caller holds hdev->lock */
948static int hci_explicit_conn_params_set(struct hci_dev *hdev,
949 bdaddr_t *addr, u8 addr_type)
950{
951 struct hci_conn_params *params;
952
953 if (is_connected(hdev, addr, addr_type))
954 return -EISCONN;
955
956 params = hci_conn_params_lookup(hdev, addr, addr_type);
957 if (!params) {
958 params = hci_conn_params_add(hdev, addr, addr_type);
959 if (!params)
960 return -ENOMEM;
961
962 /* If we created new params, mark them to be deleted in
963 * hci_connect_le_scan_cleanup. It's different case than
964 * existing disabled params, those will stay after cleanup.
965 */
966 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
967 }
968
969 /* We're trying to connect, so make sure params are at pend_le_conns */
970 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
971 params->auto_connect == HCI_AUTO_CONN_REPORT ||
972 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
973 list_del_init(¶ms->action);
974 list_add(¶ms->action, &hdev->pend_le_conns);
975 }
976
977 params->explicit_connect = true;
978
979 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
980 params->auto_connect);
981
982 return 0;
983}
984
985/* This function requires the caller holds hdev->lock */
986struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
987 u8 dst_type, u8 sec_level,
988 u16 conn_timeout)
989{
990 struct hci_conn *conn;
991
992 /* Let's make sure that le is enabled.*/
993 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
994 if (lmp_le_capable(hdev))
995 return ERR_PTR(-ECONNREFUSED);
996
997 return ERR_PTR(-EOPNOTSUPP);
998 }
999
1000 /* Some devices send ATT messages as soon as the physical link is
1001 * established. To be able to handle these ATT messages, the user-
1002 * space first establishes the connection and then starts the pairing
1003 * process.
1004 *
1005 * So if a hci_conn object already exists for the following connection
1006 * attempt, we simply update pending_sec_level and auth_type fields
1007 * and return the object found.
1008 */
1009 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1010 if (conn) {
1011 if (conn->pending_sec_level < sec_level)
1012 conn->pending_sec_level = sec_level;
1013 goto done;
1014 }
1015
1016 BT_DBG("requesting refresh of dst_addr");
1017
1018 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1019 if (!conn)
1020 return ERR_PTR(-ENOMEM);
1021
1022 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1023 return ERR_PTR(-EBUSY);
1024
1025 conn->state = BT_CONNECT;
1026 set_bit(HCI_CONN_SCANNING, &conn->flags);
1027 conn->dst_type = dst_type;
1028 conn->sec_level = BT_SECURITY_LOW;
1029 conn->pending_sec_level = sec_level;
1030 conn->conn_timeout = conn_timeout;
1031
1032 hci_update_background_scan(hdev);
1033
1034done:
1035 hci_conn_hold(conn);
1036 return conn;
1037}
1038
1039struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1040 u8 sec_level, u8 auth_type)
1041{
1042 struct hci_conn *acl;
1043
1044 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1045 if (lmp_bredr_capable(hdev))
1046 return ERR_PTR(-ECONNREFUSED);
1047
1048 return ERR_PTR(-EOPNOTSUPP);
1049 }
1050
1051 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1052 if (!acl) {
1053 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1054 if (!acl)
1055 return ERR_PTR(-ENOMEM);
1056 }
1057
1058 hci_conn_hold(acl);
1059
1060 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1061 acl->sec_level = BT_SECURITY_LOW;
1062 acl->pending_sec_level = sec_level;
1063 acl->auth_type = auth_type;
1064 hci_acl_create_connection(acl);
1065 }
1066
1067 return acl;
1068}
1069
1070struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1071 __u16 setting)
1072{
1073 struct hci_conn *acl;
1074 struct hci_conn *sco;
1075
1076 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1077 if (IS_ERR(acl))
1078 return acl;
1079
1080 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1081 if (!sco) {
1082 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1083 if (!sco) {
1084 hci_conn_drop(acl);
1085 return ERR_PTR(-ENOMEM);
1086 }
1087 }
1088
1089 acl->link = sco;
1090 sco->link = acl;
1091
1092 hci_conn_hold(sco);
1093
1094 sco->setting = setting;
1095
1096 if (acl->state == BT_CONNECTED &&
1097 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1098 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1099 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1100
1101 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1102 /* defer SCO setup until mode change completed */
1103 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1104 return sco;
1105 }
1106
1107 hci_sco_setup(acl, 0x00);
1108 }
1109
1110 return sco;
1111}
1112
1113/* Check link security requirement */
1114int hci_conn_check_link_mode(struct hci_conn *conn)
1115{
1116 BT_DBG("hcon %p", conn);
1117
1118 /* In Secure Connections Only mode, it is required that Secure
1119 * Connections is used and the link is encrypted with AES-CCM
1120 * using a P-256 authenticated combination key.
1121 */
1122 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1123 if (!hci_conn_sc_enabled(conn) ||
1124 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1125 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1126 return 0;
1127 }
1128
1129 if (hci_conn_ssp_enabled(conn) &&
1130 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1131 return 0;
1132
1133 return 1;
1134}
1135
1136/* Authenticate remote device */
1137static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1138{
1139 BT_DBG("hcon %p", conn);
1140
1141 if (conn->pending_sec_level > sec_level)
1142 sec_level = conn->pending_sec_level;
1143
1144 if (sec_level > conn->sec_level)
1145 conn->pending_sec_level = sec_level;
1146 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1147 return 1;
1148
1149 /* Make sure we preserve an existing MITM requirement*/
1150 auth_type |= (conn->auth_type & 0x01);
1151
1152 conn->auth_type = auth_type;
1153
1154 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1155 struct hci_cp_auth_requested cp;
1156
1157 cp.handle = cpu_to_le16(conn->handle);
1158 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1159 sizeof(cp), &cp);
1160
1161 /* If we're already encrypted set the REAUTH_PEND flag,
1162 * otherwise set the ENCRYPT_PEND.
1163 */
1164 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1165 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1166 else
1167 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1168 }
1169
1170 return 0;
1171}
1172
1173/* Encrypt the the link */
1174static void hci_conn_encrypt(struct hci_conn *conn)
1175{
1176 BT_DBG("hcon %p", conn);
1177
1178 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1179 struct hci_cp_set_conn_encrypt cp;
1180 cp.handle = cpu_to_le16(conn->handle);
1181 cp.encrypt = 0x01;
1182 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1183 &cp);
1184 }
1185}
1186
1187/* Enable security */
1188int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1189 bool initiator)
1190{
1191 BT_DBG("hcon %p", conn);
1192
1193 if (conn->type == LE_LINK)
1194 return smp_conn_security(conn, sec_level);
1195
1196 /* For sdp we don't need the link key. */
1197 if (sec_level == BT_SECURITY_SDP)
1198 return 1;
1199
1200 /* For non 2.1 devices and low security level we don't need the link
1201 key. */
1202 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1203 return 1;
1204
1205 /* For other security levels we need the link key. */
1206 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1207 goto auth;
1208
1209 /* An authenticated FIPS approved combination key has sufficient
1210 * security for security level 4. */
1211 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1212 sec_level == BT_SECURITY_FIPS)
1213 goto encrypt;
1214
1215 /* An authenticated combination key has sufficient security for
1216 security level 3. */
1217 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1218 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1219 sec_level == BT_SECURITY_HIGH)
1220 goto encrypt;
1221
1222 /* An unauthenticated combination key has sufficient security for
1223 security level 1 and 2. */
1224 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1225 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1226 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1227 goto encrypt;
1228
1229 /* A combination key has always sufficient security for the security
1230 levels 1 or 2. High security level requires the combination key
1231 is generated using maximum PIN code length (16).
1232 For pre 2.1 units. */
1233 if (conn->key_type == HCI_LK_COMBINATION &&
1234 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1235 conn->pin_length == 16))
1236 goto encrypt;
1237
1238auth:
1239 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1240 return 0;
1241
1242 if (initiator)
1243 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1244
1245 if (!hci_conn_auth(conn, sec_level, auth_type))
1246 return 0;
1247
1248encrypt:
1249 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1250 return 1;
1251
1252 hci_conn_encrypt(conn);
1253 return 0;
1254}
1255EXPORT_SYMBOL(hci_conn_security);
1256
1257/* Check secure link requirement */
1258int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1259{
1260 BT_DBG("hcon %p", conn);
1261
1262 /* Accept if non-secure or higher security level is required */
1263 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1264 return 1;
1265
1266 /* Accept if secure or higher security level is already present */
1267 if (conn->sec_level == BT_SECURITY_HIGH ||
1268 conn->sec_level == BT_SECURITY_FIPS)
1269 return 1;
1270
1271 /* Reject not secure link */
1272 return 0;
1273}
1274EXPORT_SYMBOL(hci_conn_check_secure);
1275
1276/* Switch role */
1277int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1278{
1279 BT_DBG("hcon %p", conn);
1280
1281 if (role == conn->role)
1282 return 1;
1283
1284 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1285 struct hci_cp_switch_role cp;
1286 bacpy(&cp.bdaddr, &conn->dst);
1287 cp.role = role;
1288 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1289 }
1290
1291 return 0;
1292}
1293EXPORT_SYMBOL(hci_conn_switch_role);
1294
1295/* Enter active mode */
1296void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1297{
1298 struct hci_dev *hdev = conn->hdev;
1299
1300 BT_DBG("hcon %p mode %d", conn, conn->mode);
1301
1302 if (conn->mode != HCI_CM_SNIFF)
1303 goto timer;
1304
1305 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1306 goto timer;
1307
1308 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1309 struct hci_cp_exit_sniff_mode cp;
1310 cp.handle = cpu_to_le16(conn->handle);
1311 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1312 }
1313
1314timer:
1315 if (hdev->idle_timeout > 0)
1316 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1317 msecs_to_jiffies(hdev->idle_timeout));
1318}
1319
1320/* Drop all connection on the device */
1321void hci_conn_hash_flush(struct hci_dev *hdev)
1322{
1323 struct hci_conn_hash *h = &hdev->conn_hash;
1324 struct hci_conn *c, *n;
1325
1326 BT_DBG("hdev %s", hdev->name);
1327
1328 list_for_each_entry_safe(c, n, &h->list, list) {
1329 c->state = BT_CLOSED;
1330
1331 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1332 hci_conn_del(c);
1333 }
1334}
1335
1336/* Check pending connect attempts */
1337void hci_conn_check_pending(struct hci_dev *hdev)
1338{
1339 struct hci_conn *conn;
1340
1341 BT_DBG("hdev %s", hdev->name);
1342
1343 hci_dev_lock(hdev);
1344
1345 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1346 if (conn)
1347 hci_acl_create_connection(conn);
1348
1349 hci_dev_unlock(hdev);
1350}
1351
1352static u32 get_link_mode(struct hci_conn *conn)
1353{
1354 u32 link_mode = 0;
1355
1356 if (conn->role == HCI_ROLE_MASTER)
1357 link_mode |= HCI_LM_MASTER;
1358
1359 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1360 link_mode |= HCI_LM_ENCRYPT;
1361
1362 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1363 link_mode |= HCI_LM_AUTH;
1364
1365 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1366 link_mode |= HCI_LM_SECURE;
1367
1368 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1369 link_mode |= HCI_LM_FIPS;
1370
1371 return link_mode;
1372}
1373
1374int hci_get_conn_list(void __user *arg)
1375{
1376 struct hci_conn *c;
1377 struct hci_conn_list_req req, *cl;
1378 struct hci_conn_info *ci;
1379 struct hci_dev *hdev;
1380 int n = 0, size, err;
1381
1382 if (copy_from_user(&req, arg, sizeof(req)))
1383 return -EFAULT;
1384
1385 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1386 return -EINVAL;
1387
1388 size = sizeof(req) + req.conn_num * sizeof(*ci);
1389
1390 cl = kmalloc(size, GFP_KERNEL);
1391 if (!cl)
1392 return -ENOMEM;
1393
1394 hdev = hci_dev_get(req.dev_id);
1395 if (!hdev) {
1396 kfree(cl);
1397 return -ENODEV;
1398 }
1399
1400 ci = cl->conn_info;
1401
1402 hci_dev_lock(hdev);
1403 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1404 bacpy(&(ci + n)->bdaddr, &c->dst);
1405 (ci + n)->handle = c->handle;
1406 (ci + n)->type = c->type;
1407 (ci + n)->out = c->out;
1408 (ci + n)->state = c->state;
1409 (ci + n)->link_mode = get_link_mode(c);
1410 if (++n >= req.conn_num)
1411 break;
1412 }
1413 hci_dev_unlock(hdev);
1414
1415 cl->dev_id = hdev->id;
1416 cl->conn_num = n;
1417 size = sizeof(req) + n * sizeof(*ci);
1418
1419 hci_dev_put(hdev);
1420
1421 err = copy_to_user(arg, cl, size);
1422 kfree(cl);
1423
1424 return err ? -EFAULT : 0;
1425}
1426
1427int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1428{
1429 struct hci_conn_info_req req;
1430 struct hci_conn_info ci;
1431 struct hci_conn *conn;
1432 char __user *ptr = arg + sizeof(req);
1433
1434 if (copy_from_user(&req, arg, sizeof(req)))
1435 return -EFAULT;
1436
1437 hci_dev_lock(hdev);
1438 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1439 if (conn) {
1440 bacpy(&ci.bdaddr, &conn->dst);
1441 ci.handle = conn->handle;
1442 ci.type = conn->type;
1443 ci.out = conn->out;
1444 ci.state = conn->state;
1445 ci.link_mode = get_link_mode(conn);
1446 }
1447 hci_dev_unlock(hdev);
1448
1449 if (!conn)
1450 return -ENOENT;
1451
1452 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1453}
1454
1455int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1456{
1457 struct hci_auth_info_req req;
1458 struct hci_conn *conn;
1459
1460 if (copy_from_user(&req, arg, sizeof(req)))
1461 return -EFAULT;
1462
1463 hci_dev_lock(hdev);
1464 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1465 if (conn)
1466 req.type = conn->auth_type;
1467 hci_dev_unlock(hdev);
1468
1469 if (!conn)
1470 return -ENOENT;
1471
1472 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1473}
1474
1475struct hci_chan *hci_chan_create(struct hci_conn *conn)
1476{
1477 struct hci_dev *hdev = conn->hdev;
1478 struct hci_chan *chan;
1479
1480 BT_DBG("%s hcon %p", hdev->name, conn);
1481
1482 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1483 BT_DBG("Refusing to create new hci_chan");
1484 return NULL;
1485 }
1486
1487 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1488 if (!chan)
1489 return NULL;
1490
1491 chan->conn = hci_conn_get(conn);
1492 skb_queue_head_init(&chan->data_q);
1493 chan->state = BT_CONNECTED;
1494
1495 list_add_rcu(&chan->list, &conn->chan_list);
1496
1497 return chan;
1498}
1499
1500void hci_chan_del(struct hci_chan *chan)
1501{
1502 struct hci_conn *conn = chan->conn;
1503 struct hci_dev *hdev = conn->hdev;
1504
1505 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1506
1507 list_del_rcu(&chan->list);
1508
1509 synchronize_rcu();
1510
1511 /* Prevent new hci_chan's to be created for this hci_conn */
1512 set_bit(HCI_CONN_DROP, &conn->flags);
1513
1514 hci_conn_put(conn);
1515
1516 skb_queue_purge(&chan->data_q);
1517 kfree(chan);
1518}
1519
1520void hci_chan_list_flush(struct hci_conn *conn)
1521{
1522 struct hci_chan *chan, *n;
1523
1524 BT_DBG("hcon %p", conn);
1525
1526 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1527 hci_chan_del(chan);
1528}
1529
1530static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1531 __u16 handle)
1532{
1533 struct hci_chan *hchan;
1534
1535 list_for_each_entry(hchan, &hcon->chan_list, list) {
1536 if (hchan->handle == handle)
1537 return hchan;
1538 }
1539
1540 return NULL;
1541}
1542
1543struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1544{
1545 struct hci_conn_hash *h = &hdev->conn_hash;
1546 struct hci_conn *hcon;
1547 struct hci_chan *hchan = NULL;
1548
1549 rcu_read_lock();
1550
1551 list_for_each_entry_rcu(hcon, &h->list, list) {
1552 hchan = __hci_chan_lookup_handle(hcon, handle);
1553 if (hchan)
1554 break;
1555 }
1556
1557 rcu_read_unlock();
1558
1559 return hchan;
1560}
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4
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
29#include <net/bluetooth/bluetooth.h>
30#include <net/bluetooth/hci_core.h>
31
32#include "smp.h"
33#include "a2mp.h"
34
35struct sco_param {
36 u16 pkt_type;
37 u16 max_latency;
38};
39
40static const struct sco_param sco_param_cvsd[] = {
41 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a }, /* S3 */
42 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007 }, /* S2 */
43 { EDR_ESCO_MASK | ESCO_EV3, 0x0007 }, /* S1 */
44 { EDR_ESCO_MASK | ESCO_HV3, 0xffff }, /* D1 */
45 { EDR_ESCO_MASK | ESCO_HV1, 0xffff }, /* D0 */
46};
47
48static const struct sco_param sco_param_wideband[] = {
49 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d }, /* T2 */
50 { EDR_ESCO_MASK | ESCO_EV3, 0x0008 }, /* T1 */
51};
52
53static void hci_le_create_connection_cancel(struct hci_conn *conn)
54{
55 hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
56}
57
58static void hci_acl_create_connection(struct hci_conn *conn)
59{
60 struct hci_dev *hdev = conn->hdev;
61 struct inquiry_entry *ie;
62 struct hci_cp_create_conn cp;
63
64 BT_DBG("hcon %p", conn);
65
66 conn->state = BT_CONNECT;
67 conn->out = true;
68
69 conn->link_mode = HCI_LM_MASTER;
70
71 conn->attempt++;
72
73 conn->link_policy = hdev->link_policy;
74
75 memset(&cp, 0, sizeof(cp));
76 bacpy(&cp.bdaddr, &conn->dst);
77 cp.pscan_rep_mode = 0x02;
78
79 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
80 if (ie) {
81 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
82 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
83 cp.pscan_mode = ie->data.pscan_mode;
84 cp.clock_offset = ie->data.clock_offset |
85 cpu_to_le16(0x8000);
86 }
87
88 memcpy(conn->dev_class, ie->data.dev_class, 3);
89 if (ie->data.ssp_mode > 0)
90 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
91 }
92
93 cp.pkt_type = cpu_to_le16(conn->pkt_type);
94 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
95 cp.role_switch = 0x01;
96 else
97 cp.role_switch = 0x00;
98
99 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
100}
101
102static void hci_acl_create_connection_cancel(struct hci_conn *conn)
103{
104 struct hci_cp_create_conn_cancel cp;
105
106 BT_DBG("hcon %p", conn);
107
108 if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
109 return;
110
111 bacpy(&cp.bdaddr, &conn->dst);
112 hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
113}
114
115static void hci_reject_sco(struct hci_conn *conn)
116{
117 struct hci_cp_reject_sync_conn_req cp;
118
119 cp.reason = HCI_ERROR_REMOTE_USER_TERM;
120 bacpy(&cp.bdaddr, &conn->dst);
121
122 hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
123}
124
125void hci_disconnect(struct hci_conn *conn, __u8 reason)
126{
127 struct hci_cp_disconnect cp;
128
129 BT_DBG("hcon %p", conn);
130
131 conn->state = BT_DISCONN;
132
133 cp.handle = cpu_to_le16(conn->handle);
134 cp.reason = reason;
135 hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
136}
137
138static void hci_amp_disconn(struct hci_conn *conn, __u8 reason)
139{
140 struct hci_cp_disconn_phy_link cp;
141
142 BT_DBG("hcon %p", conn);
143
144 conn->state = BT_DISCONN;
145
146 cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
147 cp.reason = reason;
148 hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
149 sizeof(cp), &cp);
150}
151
152static void hci_add_sco(struct hci_conn *conn, __u16 handle)
153{
154 struct hci_dev *hdev = conn->hdev;
155 struct hci_cp_add_sco cp;
156
157 BT_DBG("hcon %p", conn);
158
159 conn->state = BT_CONNECT;
160 conn->out = true;
161
162 conn->attempt++;
163
164 cp.handle = cpu_to_le16(handle);
165 cp.pkt_type = cpu_to_le16(conn->pkt_type);
166
167 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
168}
169
170bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
171{
172 struct hci_dev *hdev = conn->hdev;
173 struct hci_cp_setup_sync_conn cp;
174 const struct sco_param *param;
175
176 BT_DBG("hcon %p", conn);
177
178 conn->state = BT_CONNECT;
179 conn->out = true;
180
181 conn->attempt++;
182
183 cp.handle = cpu_to_le16(handle);
184
185 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
186 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
187 cp.voice_setting = cpu_to_le16(conn->setting);
188
189 switch (conn->setting & SCO_AIRMODE_MASK) {
190 case SCO_AIRMODE_TRANSP:
191 if (conn->attempt > ARRAY_SIZE(sco_param_wideband))
192 return false;
193 cp.retrans_effort = 0x02;
194 param = &sco_param_wideband[conn->attempt - 1];
195 break;
196 case SCO_AIRMODE_CVSD:
197 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
198 return false;
199 cp.retrans_effort = 0x01;
200 param = &sco_param_cvsd[conn->attempt - 1];
201 break;
202 default:
203 return false;
204 }
205
206 cp.pkt_type = __cpu_to_le16(param->pkt_type);
207 cp.max_latency = __cpu_to_le16(param->max_latency);
208
209 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
210 return false;
211
212 return true;
213}
214
215void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
216 u16 latency, u16 to_multiplier)
217{
218 struct hci_cp_le_conn_update cp;
219 struct hci_dev *hdev = conn->hdev;
220
221 memset(&cp, 0, sizeof(cp));
222
223 cp.handle = cpu_to_le16(conn->handle);
224 cp.conn_interval_min = cpu_to_le16(min);
225 cp.conn_interval_max = cpu_to_le16(max);
226 cp.conn_latency = cpu_to_le16(latency);
227 cp.supervision_timeout = cpu_to_le16(to_multiplier);
228 cp.min_ce_len = cpu_to_le16(0x0000);
229 cp.max_ce_len = cpu_to_le16(0x0000);
230
231 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
232}
233
234void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
235 __u8 ltk[16])
236{
237 struct hci_dev *hdev = conn->hdev;
238 struct hci_cp_le_start_enc cp;
239
240 BT_DBG("hcon %p", conn);
241
242 memset(&cp, 0, sizeof(cp));
243
244 cp.handle = cpu_to_le16(conn->handle);
245 cp.rand = rand;
246 cp.ediv = ediv;
247 memcpy(cp.ltk, ltk, sizeof(cp.ltk));
248
249 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
250}
251
252/* Device _must_ be locked */
253void hci_sco_setup(struct hci_conn *conn, __u8 status)
254{
255 struct hci_conn *sco = conn->link;
256
257 if (!sco)
258 return;
259
260 BT_DBG("hcon %p", conn);
261
262 if (!status) {
263 if (lmp_esco_capable(conn->hdev))
264 hci_setup_sync(sco, conn->handle);
265 else
266 hci_add_sco(sco, conn->handle);
267 } else {
268 hci_proto_connect_cfm(sco, status);
269 hci_conn_del(sco);
270 }
271}
272
273static void hci_conn_disconnect(struct hci_conn *conn)
274{
275 __u8 reason = hci_proto_disconn_ind(conn);
276
277 switch (conn->type) {
278 case AMP_LINK:
279 hci_amp_disconn(conn, reason);
280 break;
281 default:
282 hci_disconnect(conn, reason);
283 break;
284 }
285}
286
287static void hci_conn_timeout(struct work_struct *work)
288{
289 struct hci_conn *conn = container_of(work, struct hci_conn,
290 disc_work.work);
291
292 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
293
294 if (atomic_read(&conn->refcnt))
295 return;
296
297 switch (conn->state) {
298 case BT_CONNECT:
299 case BT_CONNECT2:
300 if (conn->out) {
301 if (conn->type == ACL_LINK)
302 hci_acl_create_connection_cancel(conn);
303 else if (conn->type == LE_LINK)
304 hci_le_create_connection_cancel(conn);
305 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
306 hci_reject_sco(conn);
307 }
308 break;
309 case BT_CONFIG:
310 case BT_CONNECTED:
311 hci_conn_disconnect(conn);
312 break;
313 default:
314 conn->state = BT_CLOSED;
315 break;
316 }
317}
318
319/* Enter sniff mode */
320static void hci_conn_idle(struct work_struct *work)
321{
322 struct hci_conn *conn = container_of(work, struct hci_conn,
323 idle_work.work);
324 struct hci_dev *hdev = conn->hdev;
325
326 BT_DBG("hcon %p mode %d", conn, conn->mode);
327
328 if (test_bit(HCI_RAW, &hdev->flags))
329 return;
330
331 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
332 return;
333
334 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
335 return;
336
337 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
338 struct hci_cp_sniff_subrate cp;
339 cp.handle = cpu_to_le16(conn->handle);
340 cp.max_latency = cpu_to_le16(0);
341 cp.min_remote_timeout = cpu_to_le16(0);
342 cp.min_local_timeout = cpu_to_le16(0);
343 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
344 }
345
346 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
347 struct hci_cp_sniff_mode cp;
348 cp.handle = cpu_to_le16(conn->handle);
349 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
350 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
351 cp.attempt = cpu_to_le16(4);
352 cp.timeout = cpu_to_le16(1);
353 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
354 }
355}
356
357static void hci_conn_auto_accept(struct work_struct *work)
358{
359 struct hci_conn *conn = container_of(work, struct hci_conn,
360 auto_accept_work.work);
361
362 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
363 &conn->dst);
364}
365
366static void le_conn_timeout(struct work_struct *work)
367{
368 struct hci_conn *conn = container_of(work, struct hci_conn,
369 le_conn_timeout.work);
370
371 BT_DBG("");
372
373 hci_le_create_connection_cancel(conn);
374}
375
376struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
377{
378 struct hci_conn *conn;
379
380 BT_DBG("%s dst %pMR", hdev->name, dst);
381
382 conn = kzalloc(sizeof(struct hci_conn), GFP_KERNEL);
383 if (!conn)
384 return NULL;
385
386 bacpy(&conn->dst, dst);
387 bacpy(&conn->src, &hdev->bdaddr);
388 conn->hdev = hdev;
389 conn->type = type;
390 conn->mode = HCI_CM_ACTIVE;
391 conn->state = BT_OPEN;
392 conn->auth_type = HCI_AT_GENERAL_BONDING;
393 conn->io_capability = hdev->io_capability;
394 conn->remote_auth = 0xff;
395 conn->key_type = 0xff;
396
397 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
398 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
399
400 switch (type) {
401 case ACL_LINK:
402 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
403 break;
404 case SCO_LINK:
405 if (lmp_esco_capable(hdev))
406 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
407 (hdev->esco_type & EDR_ESCO_MASK);
408 else
409 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
410 break;
411 case ESCO_LINK:
412 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
413 break;
414 }
415
416 skb_queue_head_init(&conn->data_q);
417
418 INIT_LIST_HEAD(&conn->chan_list);
419
420 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
421 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
422 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
423 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
424
425 atomic_set(&conn->refcnt, 0);
426
427 hci_dev_hold(hdev);
428
429 hci_conn_hash_add(hdev, conn);
430 if (hdev->notify)
431 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
432
433 hci_conn_init_sysfs(conn);
434
435 return conn;
436}
437
438int hci_conn_del(struct hci_conn *conn)
439{
440 struct hci_dev *hdev = conn->hdev;
441
442 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
443
444 cancel_delayed_work_sync(&conn->disc_work);
445 cancel_delayed_work_sync(&conn->auto_accept_work);
446 cancel_delayed_work_sync(&conn->idle_work);
447
448 if (conn->type == ACL_LINK) {
449 struct hci_conn *sco = conn->link;
450 if (sco)
451 sco->link = NULL;
452
453 /* Unacked frames */
454 hdev->acl_cnt += conn->sent;
455 } else if (conn->type == LE_LINK) {
456 cancel_delayed_work_sync(&conn->le_conn_timeout);
457
458 if (hdev->le_pkts)
459 hdev->le_cnt += conn->sent;
460 else
461 hdev->acl_cnt += conn->sent;
462 } else {
463 struct hci_conn *acl = conn->link;
464 if (acl) {
465 acl->link = NULL;
466 hci_conn_drop(acl);
467 }
468 }
469
470 hci_chan_list_flush(conn);
471
472 if (conn->amp_mgr)
473 amp_mgr_put(conn->amp_mgr);
474
475 hci_conn_hash_del(hdev, conn);
476 if (hdev->notify)
477 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
478
479 skb_queue_purge(&conn->data_q);
480
481 hci_conn_del_sysfs(conn);
482
483 hci_dev_put(hdev);
484
485 hci_conn_put(conn);
486
487 return 0;
488}
489
490struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
491{
492 int use_src = bacmp(src, BDADDR_ANY);
493 struct hci_dev *hdev = NULL, *d;
494
495 BT_DBG("%pMR -> %pMR", src, dst);
496
497 read_lock(&hci_dev_list_lock);
498
499 list_for_each_entry(d, &hci_dev_list, list) {
500 if (!test_bit(HCI_UP, &d->flags) ||
501 test_bit(HCI_RAW, &d->flags) ||
502 test_bit(HCI_USER_CHANNEL, &d->dev_flags) ||
503 d->dev_type != HCI_BREDR)
504 continue;
505
506 /* Simple routing:
507 * No source address - find interface with bdaddr != dst
508 * Source address - find interface with bdaddr == src
509 */
510
511 if (use_src) {
512 if (!bacmp(&d->bdaddr, src)) {
513 hdev = d; break;
514 }
515 } else {
516 if (bacmp(&d->bdaddr, dst)) {
517 hdev = d; break;
518 }
519 }
520 }
521
522 if (hdev)
523 hdev = hci_dev_hold(hdev);
524
525 read_unlock(&hci_dev_list_lock);
526 return hdev;
527}
528EXPORT_SYMBOL(hci_get_route);
529
530/* This function requires the caller holds hdev->lock */
531void hci_le_conn_failed(struct hci_conn *conn, u8 status)
532{
533 struct hci_dev *hdev = conn->hdev;
534
535 conn->state = BT_CLOSED;
536
537 mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
538 status);
539
540 hci_proto_connect_cfm(conn, status);
541
542 hci_conn_del(conn);
543
544 /* Since we may have temporarily stopped the background scanning in
545 * favor of connection establishment, we should restart it.
546 */
547 hci_update_background_scan(hdev);
548}
549
550static void create_le_conn_complete(struct hci_dev *hdev, u8 status)
551{
552 struct hci_conn *conn;
553
554 if (status == 0)
555 return;
556
557 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
558 status);
559
560 hci_dev_lock(hdev);
561
562 conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
563 if (!conn)
564 goto done;
565
566 hci_le_conn_failed(conn, status);
567
568done:
569 hci_dev_unlock(hdev);
570}
571
572static void hci_req_add_le_create_conn(struct hci_request *req,
573 struct hci_conn *conn)
574{
575 struct hci_cp_le_create_conn cp;
576 struct hci_dev *hdev = conn->hdev;
577 u8 own_addr_type;
578
579 memset(&cp, 0, sizeof(cp));
580
581 /* Update random address, but set require_privacy to false so
582 * that we never connect with an unresolvable address.
583 */
584 if (hci_update_random_address(req, false, &own_addr_type))
585 return;
586
587 /* Save the address type used for this connnection attempt so we able
588 * to retrieve this information if we need it.
589 */
590 conn->src_type = own_addr_type;
591
592 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
593 cp.scan_window = cpu_to_le16(hdev->le_scan_window);
594 bacpy(&cp.peer_addr, &conn->dst);
595 cp.peer_addr_type = conn->dst_type;
596 cp.own_address_type = own_addr_type;
597 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
598 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
599 cp.supervision_timeout = cpu_to_le16(0x002a);
600 cp.min_ce_len = cpu_to_le16(0x0000);
601 cp.max_ce_len = cpu_to_le16(0x0000);
602
603 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
604
605 conn->state = BT_CONNECT;
606}
607
608struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
609 u8 dst_type, u8 sec_level, u8 auth_type)
610{
611 struct hci_conn_params *params;
612 struct hci_conn *conn;
613 struct smp_irk *irk;
614 struct hci_request req;
615 int err;
616
617 if (test_bit(HCI_ADVERTISING, &hdev->flags))
618 return ERR_PTR(-ENOTSUPP);
619
620 /* Some devices send ATT messages as soon as the physical link is
621 * established. To be able to handle these ATT messages, the user-
622 * space first establishes the connection and then starts the pairing
623 * process.
624 *
625 * So if a hci_conn object already exists for the following connection
626 * attempt, we simply update pending_sec_level and auth_type fields
627 * and return the object found.
628 */
629 conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
630 if (conn) {
631 conn->pending_sec_level = sec_level;
632 conn->auth_type = auth_type;
633 goto done;
634 }
635
636 /* Since the controller supports only one LE connection attempt at a
637 * time, we return -EBUSY if there is any connection attempt running.
638 */
639 conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
640 if (conn)
641 return ERR_PTR(-EBUSY);
642
643 /* When given an identity address with existing identity
644 * resolving key, the connection needs to be established
645 * to a resolvable random address.
646 *
647 * This uses the cached random resolvable address from
648 * a previous scan. When no cached address is available,
649 * try connecting to the identity address instead.
650 *
651 * Storing the resolvable random address is required here
652 * to handle connection failures. The address will later
653 * be resolved back into the original identity address
654 * from the connect request.
655 */
656 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
657 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
658 dst = &irk->rpa;
659 dst_type = ADDR_LE_DEV_RANDOM;
660 }
661
662 conn = hci_conn_add(hdev, LE_LINK, dst);
663 if (!conn)
664 return ERR_PTR(-ENOMEM);
665
666 conn->dst_type = dst_type;
667
668 conn->out = true;
669 conn->link_mode |= HCI_LM_MASTER;
670 conn->sec_level = BT_SECURITY_LOW;
671 conn->pending_sec_level = sec_level;
672 conn->auth_type = auth_type;
673
674 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
675 if (params) {
676 conn->le_conn_min_interval = params->conn_min_interval;
677 conn->le_conn_max_interval = params->conn_max_interval;
678 } else {
679 conn->le_conn_min_interval = hdev->le_conn_min_interval;
680 conn->le_conn_max_interval = hdev->le_conn_max_interval;
681 }
682
683 hci_req_init(&req, hdev);
684
685 /* If controller is scanning, we stop it since some controllers are
686 * not able to scan and connect at the same time. Also set the
687 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
688 * handler for scan disabling knows to set the correct discovery
689 * state.
690 */
691 if (test_bit(HCI_LE_SCAN, &hdev->dev_flags)) {
692 hci_req_add_le_scan_disable(&req);
693 set_bit(HCI_LE_SCAN_INTERRUPTED, &hdev->dev_flags);
694 }
695
696 hci_req_add_le_create_conn(&req, conn);
697
698 err = hci_req_run(&req, create_le_conn_complete);
699 if (err) {
700 hci_conn_del(conn);
701 return ERR_PTR(err);
702 }
703
704done:
705 hci_conn_hold(conn);
706 return conn;
707}
708
709struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
710 u8 sec_level, u8 auth_type)
711{
712 struct hci_conn *acl;
713
714 if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
715 return ERR_PTR(-ENOTSUPP);
716
717 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
718 if (!acl) {
719 acl = hci_conn_add(hdev, ACL_LINK, dst);
720 if (!acl)
721 return ERR_PTR(-ENOMEM);
722 }
723
724 hci_conn_hold(acl);
725
726 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
727 acl->sec_level = BT_SECURITY_LOW;
728 acl->pending_sec_level = sec_level;
729 acl->auth_type = auth_type;
730 hci_acl_create_connection(acl);
731 }
732
733 return acl;
734}
735
736struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
737 __u16 setting)
738{
739 struct hci_conn *acl;
740 struct hci_conn *sco;
741
742 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
743 if (IS_ERR(acl))
744 return acl;
745
746 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
747 if (!sco) {
748 sco = hci_conn_add(hdev, type, dst);
749 if (!sco) {
750 hci_conn_drop(acl);
751 return ERR_PTR(-ENOMEM);
752 }
753 }
754
755 acl->link = sco;
756 sco->link = acl;
757
758 hci_conn_hold(sco);
759
760 sco->setting = setting;
761
762 if (acl->state == BT_CONNECTED &&
763 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
764 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
765 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
766
767 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
768 /* defer SCO setup until mode change completed */
769 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
770 return sco;
771 }
772
773 hci_sco_setup(acl, 0x00);
774 }
775
776 return sco;
777}
778
779/* Check link security requirement */
780int hci_conn_check_link_mode(struct hci_conn *conn)
781{
782 BT_DBG("hcon %p", conn);
783
784 /* In Secure Connections Only mode, it is required that Secure
785 * Connections is used and the link is encrypted with AES-CCM
786 * using a P-256 authenticated combination key.
787 */
788 if (test_bit(HCI_SC_ONLY, &conn->hdev->flags)) {
789 if (!hci_conn_sc_enabled(conn) ||
790 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
791 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
792 return 0;
793 }
794
795 if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
796 return 0;
797
798 return 1;
799}
800
801/* Authenticate remote device */
802static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
803{
804 BT_DBG("hcon %p", conn);
805
806 if (conn->pending_sec_level > sec_level)
807 sec_level = conn->pending_sec_level;
808
809 if (sec_level > conn->sec_level)
810 conn->pending_sec_level = sec_level;
811 else if (conn->link_mode & HCI_LM_AUTH)
812 return 1;
813
814 /* Make sure we preserve an existing MITM requirement*/
815 auth_type |= (conn->auth_type & 0x01);
816
817 conn->auth_type = auth_type;
818
819 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
820 struct hci_cp_auth_requested cp;
821
822 cp.handle = cpu_to_le16(conn->handle);
823 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
824 sizeof(cp), &cp);
825
826 /* If we're already encrypted set the REAUTH_PEND flag,
827 * otherwise set the ENCRYPT_PEND.
828 */
829 if (conn->key_type != 0xff)
830 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
831 else
832 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
833 }
834
835 return 0;
836}
837
838/* Encrypt the the link */
839static void hci_conn_encrypt(struct hci_conn *conn)
840{
841 BT_DBG("hcon %p", conn);
842
843 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
844 struct hci_cp_set_conn_encrypt cp;
845 cp.handle = cpu_to_le16(conn->handle);
846 cp.encrypt = 0x01;
847 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
848 &cp);
849 }
850}
851
852/* Enable security */
853int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
854{
855 BT_DBG("hcon %p", conn);
856
857 if (conn->type == LE_LINK)
858 return smp_conn_security(conn, sec_level);
859
860 /* For sdp we don't need the link key. */
861 if (sec_level == BT_SECURITY_SDP)
862 return 1;
863
864 /* For non 2.1 devices and low security level we don't need the link
865 key. */
866 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
867 return 1;
868
869 /* For other security levels we need the link key. */
870 if (!(conn->link_mode & HCI_LM_AUTH))
871 goto auth;
872
873 /* An authenticated FIPS approved combination key has sufficient
874 * security for security level 4. */
875 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
876 sec_level == BT_SECURITY_FIPS)
877 goto encrypt;
878
879 /* An authenticated combination key has sufficient security for
880 security level 3. */
881 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
882 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
883 sec_level == BT_SECURITY_HIGH)
884 goto encrypt;
885
886 /* An unauthenticated combination key has sufficient security for
887 security level 1 and 2. */
888 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
889 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
890 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
891 goto encrypt;
892
893 /* A combination key has always sufficient security for the security
894 levels 1 or 2. High security level requires the combination key
895 is generated using maximum PIN code length (16).
896 For pre 2.1 units. */
897 if (conn->key_type == HCI_LK_COMBINATION &&
898 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
899 conn->pin_length == 16))
900 goto encrypt;
901
902auth:
903 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
904 return 0;
905
906 if (!hci_conn_auth(conn, sec_level, auth_type))
907 return 0;
908
909encrypt:
910 if (conn->link_mode & HCI_LM_ENCRYPT)
911 return 1;
912
913 hci_conn_encrypt(conn);
914 return 0;
915}
916EXPORT_SYMBOL(hci_conn_security);
917
918/* Check secure link requirement */
919int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
920{
921 BT_DBG("hcon %p", conn);
922
923 /* Accept if non-secure or higher security level is required */
924 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
925 return 1;
926
927 /* Accept if secure or higher security level is already present */
928 if (conn->sec_level == BT_SECURITY_HIGH ||
929 conn->sec_level == BT_SECURITY_FIPS)
930 return 1;
931
932 /* Reject not secure link */
933 return 0;
934}
935EXPORT_SYMBOL(hci_conn_check_secure);
936
937/* Change link key */
938int hci_conn_change_link_key(struct hci_conn *conn)
939{
940 BT_DBG("hcon %p", conn);
941
942 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
943 struct hci_cp_change_conn_link_key cp;
944 cp.handle = cpu_to_le16(conn->handle);
945 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
946 sizeof(cp), &cp);
947 }
948
949 return 0;
950}
951
952/* Switch role */
953int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
954{
955 BT_DBG("hcon %p", conn);
956
957 if (!role && conn->link_mode & HCI_LM_MASTER)
958 return 1;
959
960 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
961 struct hci_cp_switch_role cp;
962 bacpy(&cp.bdaddr, &conn->dst);
963 cp.role = role;
964 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
965 }
966
967 return 0;
968}
969EXPORT_SYMBOL(hci_conn_switch_role);
970
971/* Enter active mode */
972void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
973{
974 struct hci_dev *hdev = conn->hdev;
975
976 BT_DBG("hcon %p mode %d", conn, conn->mode);
977
978 if (test_bit(HCI_RAW, &hdev->flags))
979 return;
980
981 if (conn->mode != HCI_CM_SNIFF)
982 goto timer;
983
984 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
985 goto timer;
986
987 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
988 struct hci_cp_exit_sniff_mode cp;
989 cp.handle = cpu_to_le16(conn->handle);
990 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
991 }
992
993timer:
994 if (hdev->idle_timeout > 0)
995 queue_delayed_work(hdev->workqueue, &conn->idle_work,
996 msecs_to_jiffies(hdev->idle_timeout));
997}
998
999/* Drop all connection on the device */
1000void hci_conn_hash_flush(struct hci_dev *hdev)
1001{
1002 struct hci_conn_hash *h = &hdev->conn_hash;
1003 struct hci_conn *c, *n;
1004
1005 BT_DBG("hdev %s", hdev->name);
1006
1007 list_for_each_entry_safe(c, n, &h->list, list) {
1008 c->state = BT_CLOSED;
1009
1010 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1011 hci_conn_del(c);
1012 }
1013}
1014
1015/* Check pending connect attempts */
1016void hci_conn_check_pending(struct hci_dev *hdev)
1017{
1018 struct hci_conn *conn;
1019
1020 BT_DBG("hdev %s", hdev->name);
1021
1022 hci_dev_lock(hdev);
1023
1024 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1025 if (conn)
1026 hci_acl_create_connection(conn);
1027
1028 hci_dev_unlock(hdev);
1029}
1030
1031int hci_get_conn_list(void __user *arg)
1032{
1033 struct hci_conn *c;
1034 struct hci_conn_list_req req, *cl;
1035 struct hci_conn_info *ci;
1036 struct hci_dev *hdev;
1037 int n = 0, size, err;
1038
1039 if (copy_from_user(&req, arg, sizeof(req)))
1040 return -EFAULT;
1041
1042 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1043 return -EINVAL;
1044
1045 size = sizeof(req) + req.conn_num * sizeof(*ci);
1046
1047 cl = kmalloc(size, GFP_KERNEL);
1048 if (!cl)
1049 return -ENOMEM;
1050
1051 hdev = hci_dev_get(req.dev_id);
1052 if (!hdev) {
1053 kfree(cl);
1054 return -ENODEV;
1055 }
1056
1057 ci = cl->conn_info;
1058
1059 hci_dev_lock(hdev);
1060 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1061 bacpy(&(ci + n)->bdaddr, &c->dst);
1062 (ci + n)->handle = c->handle;
1063 (ci + n)->type = c->type;
1064 (ci + n)->out = c->out;
1065 (ci + n)->state = c->state;
1066 (ci + n)->link_mode = c->link_mode;
1067 if (++n >= req.conn_num)
1068 break;
1069 }
1070 hci_dev_unlock(hdev);
1071
1072 cl->dev_id = hdev->id;
1073 cl->conn_num = n;
1074 size = sizeof(req) + n * sizeof(*ci);
1075
1076 hci_dev_put(hdev);
1077
1078 err = copy_to_user(arg, cl, size);
1079 kfree(cl);
1080
1081 return err ? -EFAULT : 0;
1082}
1083
1084int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1085{
1086 struct hci_conn_info_req req;
1087 struct hci_conn_info ci;
1088 struct hci_conn *conn;
1089 char __user *ptr = arg + sizeof(req);
1090
1091 if (copy_from_user(&req, arg, sizeof(req)))
1092 return -EFAULT;
1093
1094 hci_dev_lock(hdev);
1095 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1096 if (conn) {
1097 bacpy(&ci.bdaddr, &conn->dst);
1098 ci.handle = conn->handle;
1099 ci.type = conn->type;
1100 ci.out = conn->out;
1101 ci.state = conn->state;
1102 ci.link_mode = conn->link_mode;
1103 }
1104 hci_dev_unlock(hdev);
1105
1106 if (!conn)
1107 return -ENOENT;
1108
1109 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1110}
1111
1112int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1113{
1114 struct hci_auth_info_req req;
1115 struct hci_conn *conn;
1116
1117 if (copy_from_user(&req, arg, sizeof(req)))
1118 return -EFAULT;
1119
1120 hci_dev_lock(hdev);
1121 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1122 if (conn)
1123 req.type = conn->auth_type;
1124 hci_dev_unlock(hdev);
1125
1126 if (!conn)
1127 return -ENOENT;
1128
1129 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1130}
1131
1132struct hci_chan *hci_chan_create(struct hci_conn *conn)
1133{
1134 struct hci_dev *hdev = conn->hdev;
1135 struct hci_chan *chan;
1136
1137 BT_DBG("%s hcon %p", hdev->name, conn);
1138
1139 chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1140 if (!chan)
1141 return NULL;
1142
1143 chan->conn = conn;
1144 skb_queue_head_init(&chan->data_q);
1145 chan->state = BT_CONNECTED;
1146
1147 list_add_rcu(&chan->list, &conn->chan_list);
1148
1149 return chan;
1150}
1151
1152void hci_chan_del(struct hci_chan *chan)
1153{
1154 struct hci_conn *conn = chan->conn;
1155 struct hci_dev *hdev = conn->hdev;
1156
1157 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1158
1159 list_del_rcu(&chan->list);
1160
1161 synchronize_rcu();
1162
1163 hci_conn_drop(conn);
1164
1165 skb_queue_purge(&chan->data_q);
1166 kfree(chan);
1167}
1168
1169void hci_chan_list_flush(struct hci_conn *conn)
1170{
1171 struct hci_chan *chan, *n;
1172
1173 BT_DBG("hcon %p", conn);
1174
1175 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1176 hci_chan_del(chan);
1177}
1178
1179static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1180 __u16 handle)
1181{
1182 struct hci_chan *hchan;
1183
1184 list_for_each_entry(hchan, &hcon->chan_list, list) {
1185 if (hchan->handle == handle)
1186 return hchan;
1187 }
1188
1189 return NULL;
1190}
1191
1192struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1193{
1194 struct hci_conn_hash *h = &hdev->conn_hash;
1195 struct hci_conn *hcon;
1196 struct hci_chan *hchan = NULL;
1197
1198 rcu_read_lock();
1199
1200 list_for_each_entry_rcu(hcon, &h->list, list) {
1201 hchan = __hci_chan_lookup_handle(hcon, handle);
1202 if (hchan)
1203 break;
1204 }
1205
1206 rcu_read_unlock();
1207
1208 return hchan;
1209}