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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/module.h>
28
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/slab.h>
33#include <linux/poll.h>
34#include <linux/fcntl.h>
35#include <linux/init.h>
36#include <linux/skbuff.h>
37#include <linux/interrupt.h>
38#include <linux/notifier.h>
39#include <net/sock.h>
40
41#include <asm/system.h>
42#include <linux/uaccess.h>
43#include <asm/unaligned.h>
44
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
47
48static void hci_le_connect(struct hci_conn *conn)
49{
50 struct hci_dev *hdev = conn->hdev;
51 struct hci_cp_le_create_conn cp;
52
53 conn->state = BT_CONNECT;
54 conn->out = 1;
55 conn->link_mode |= HCI_LM_MASTER;
56 conn->sec_level = BT_SECURITY_LOW;
57
58 memset(&cp, 0, sizeof(cp));
59 cp.scan_interval = cpu_to_le16(0x0004);
60 cp.scan_window = cpu_to_le16(0x0004);
61 bacpy(&cp.peer_addr, &conn->dst);
62 cp.peer_addr_type = conn->dst_type;
63 cp.conn_interval_min = cpu_to_le16(0x0008);
64 cp.conn_interval_max = cpu_to_le16(0x0100);
65 cp.supervision_timeout = cpu_to_le16(0x0064);
66 cp.min_ce_len = cpu_to_le16(0x0001);
67 cp.max_ce_len = cpu_to_le16(0x0001);
68
69 hci_send_cmd(hdev, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
70}
71
72static void hci_le_connect_cancel(struct hci_conn *conn)
73{
74 hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
75}
76
77void hci_acl_connect(struct hci_conn *conn)
78{
79 struct hci_dev *hdev = conn->hdev;
80 struct inquiry_entry *ie;
81 struct hci_cp_create_conn cp;
82
83 BT_DBG("%p", conn);
84
85 conn->state = BT_CONNECT;
86 conn->out = 1;
87
88 conn->link_mode = HCI_LM_MASTER;
89
90 conn->attempt++;
91
92 conn->link_policy = hdev->link_policy;
93
94 memset(&cp, 0, sizeof(cp));
95 bacpy(&cp.bdaddr, &conn->dst);
96 cp.pscan_rep_mode = 0x02;
97
98 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
99 if (ie) {
100 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
101 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
102 cp.pscan_mode = ie->data.pscan_mode;
103 cp.clock_offset = ie->data.clock_offset |
104 cpu_to_le16(0x8000);
105 }
106
107 memcpy(conn->dev_class, ie->data.dev_class, 3);
108 conn->ssp_mode = ie->data.ssp_mode;
109 }
110
111 cp.pkt_type = cpu_to_le16(conn->pkt_type);
112 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
113 cp.role_switch = 0x01;
114 else
115 cp.role_switch = 0x00;
116
117 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
118}
119
120static void hci_acl_connect_cancel(struct hci_conn *conn)
121{
122 struct hci_cp_create_conn_cancel cp;
123
124 BT_DBG("%p", conn);
125
126 if (conn->hdev->hci_ver < 2)
127 return;
128
129 bacpy(&cp.bdaddr, &conn->dst);
130 hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
131}
132
133void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
134{
135 struct hci_cp_disconnect cp;
136
137 BT_DBG("%p", conn);
138
139 conn->state = BT_DISCONN;
140
141 cp.handle = cpu_to_le16(conn->handle);
142 cp.reason = reason;
143 hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
144}
145
146void hci_add_sco(struct hci_conn *conn, __u16 handle)
147{
148 struct hci_dev *hdev = conn->hdev;
149 struct hci_cp_add_sco cp;
150
151 BT_DBG("%p", conn);
152
153 conn->state = BT_CONNECT;
154 conn->out = 1;
155
156 conn->attempt++;
157
158 cp.handle = cpu_to_le16(handle);
159 cp.pkt_type = cpu_to_le16(conn->pkt_type);
160
161 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
162}
163
164void hci_setup_sync(struct hci_conn *conn, __u16 handle)
165{
166 struct hci_dev *hdev = conn->hdev;
167 struct hci_cp_setup_sync_conn cp;
168
169 BT_DBG("%p", conn);
170
171 conn->state = BT_CONNECT;
172 conn->out = 1;
173
174 conn->attempt++;
175
176 cp.handle = cpu_to_le16(handle);
177 cp.pkt_type = cpu_to_le16(conn->pkt_type);
178
179 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
180 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
181 cp.max_latency = cpu_to_le16(0xffff);
182 cp.voice_setting = cpu_to_le16(hdev->voice_setting);
183 cp.retrans_effort = 0xff;
184
185 hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
186}
187
188void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
189 u16 latency, u16 to_multiplier)
190{
191 struct hci_cp_le_conn_update cp;
192 struct hci_dev *hdev = conn->hdev;
193
194 memset(&cp, 0, sizeof(cp));
195
196 cp.handle = cpu_to_le16(conn->handle);
197 cp.conn_interval_min = cpu_to_le16(min);
198 cp.conn_interval_max = cpu_to_le16(max);
199 cp.conn_latency = cpu_to_le16(latency);
200 cp.supervision_timeout = cpu_to_le16(to_multiplier);
201 cp.min_ce_len = cpu_to_le16(0x0001);
202 cp.max_ce_len = cpu_to_le16(0x0001);
203
204 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
205}
206EXPORT_SYMBOL(hci_le_conn_update);
207
208void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __u8 rand[8],
209 __u8 ltk[16])
210{
211 struct hci_dev *hdev = conn->hdev;
212 struct hci_cp_le_start_enc cp;
213
214 BT_DBG("%p", conn);
215
216 memset(&cp, 0, sizeof(cp));
217
218 cp.handle = cpu_to_le16(conn->handle);
219 memcpy(cp.ltk, ltk, sizeof(cp.ltk));
220 cp.ediv = ediv;
221 memcpy(cp.rand, rand, sizeof(rand));
222
223 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
224}
225EXPORT_SYMBOL(hci_le_start_enc);
226
227void hci_le_ltk_reply(struct hci_conn *conn, u8 ltk[16])
228{
229 struct hci_dev *hdev = conn->hdev;
230 struct hci_cp_le_ltk_reply cp;
231
232 BT_DBG("%p", conn);
233
234 memset(&cp, 0, sizeof(cp));
235
236 cp.handle = cpu_to_le16(conn->handle);
237 memcpy(cp.ltk, ltk, sizeof(ltk));
238
239 hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp);
240}
241EXPORT_SYMBOL(hci_le_ltk_reply);
242
243void hci_le_ltk_neg_reply(struct hci_conn *conn)
244{
245 struct hci_dev *hdev = conn->hdev;
246 struct hci_cp_le_ltk_neg_reply cp;
247
248 BT_DBG("%p", conn);
249
250 memset(&cp, 0, sizeof(cp));
251
252 cp.handle = cpu_to_le16(conn->handle);
253
254 hci_send_cmd(hdev, HCI_OP_LE_LTK_NEG_REPLY, sizeof(cp), &cp);
255}
256
257/* Device _must_ be locked */
258void hci_sco_setup(struct hci_conn *conn, __u8 status)
259{
260 struct hci_conn *sco = conn->link;
261
262 BT_DBG("%p", conn);
263
264 if (!sco)
265 return;
266
267 if (!status) {
268 if (lmp_esco_capable(conn->hdev))
269 hci_setup_sync(sco, conn->handle);
270 else
271 hci_add_sco(sco, conn->handle);
272 } else {
273 hci_proto_connect_cfm(sco, status);
274 hci_conn_del(sco);
275 }
276}
277
278static void hci_conn_timeout(unsigned long arg)
279{
280 struct hci_conn *conn = (void *) arg;
281 struct hci_dev *hdev = conn->hdev;
282 __u8 reason;
283
284 BT_DBG("conn %p state %d", conn, conn->state);
285
286 if (atomic_read(&conn->refcnt))
287 return;
288
289 hci_dev_lock(hdev);
290
291 switch (conn->state) {
292 case BT_CONNECT:
293 case BT_CONNECT2:
294 if (conn->out) {
295 if (conn->type == ACL_LINK)
296 hci_acl_connect_cancel(conn);
297 else if (conn->type == LE_LINK)
298 hci_le_connect_cancel(conn);
299 }
300 break;
301 case BT_CONFIG:
302 case BT_CONNECTED:
303 reason = hci_proto_disconn_ind(conn);
304 hci_acl_disconn(conn, reason);
305 break;
306 default:
307 conn->state = BT_CLOSED;
308 break;
309 }
310
311 hci_dev_unlock(hdev);
312}
313
314static void hci_conn_idle(unsigned long arg)
315{
316 struct hci_conn *conn = (void *) arg;
317
318 BT_DBG("conn %p mode %d", conn, conn->mode);
319
320 hci_conn_enter_sniff_mode(conn);
321}
322
323static void hci_conn_auto_accept(unsigned long arg)
324{
325 struct hci_conn *conn = (void *) arg;
326 struct hci_dev *hdev = conn->hdev;
327
328 hci_dev_lock(hdev);
329
330 hci_send_cmd(hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
331 &conn->dst);
332
333 hci_dev_unlock(hdev);
334}
335
336struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
337{
338 struct hci_conn *conn;
339
340 BT_DBG("%s dst %s", hdev->name, batostr(dst));
341
342 conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
343 if (!conn)
344 return NULL;
345
346 bacpy(&conn->dst, dst);
347 conn->hdev = hdev;
348 conn->type = type;
349 conn->mode = HCI_CM_ACTIVE;
350 conn->state = BT_OPEN;
351 conn->auth_type = HCI_AT_GENERAL_BONDING;
352 conn->io_capability = hdev->io_capability;
353 conn->remote_auth = 0xff;
354 conn->key_type = 0xff;
355
356 conn->power_save = 1;
357 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
358
359 switch (type) {
360 case ACL_LINK:
361 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
362 break;
363 case SCO_LINK:
364 if (lmp_esco_capable(hdev))
365 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
366 (hdev->esco_type & EDR_ESCO_MASK);
367 else
368 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
369 break;
370 case ESCO_LINK:
371 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
372 break;
373 }
374
375 skb_queue_head_init(&conn->data_q);
376
377 setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
378 setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
379 setup_timer(&conn->auto_accept_timer, hci_conn_auto_accept,
380 (unsigned long) conn);
381
382 atomic_set(&conn->refcnt, 0);
383
384 hci_dev_hold(hdev);
385
386 tasklet_disable(&hdev->tx_task);
387
388 hci_conn_hash_add(hdev, conn);
389 if (hdev->notify)
390 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
391
392 atomic_set(&conn->devref, 0);
393
394 hci_conn_init_sysfs(conn);
395
396 tasklet_enable(&hdev->tx_task);
397
398 return conn;
399}
400
401int hci_conn_del(struct hci_conn *conn)
402{
403 struct hci_dev *hdev = conn->hdev;
404
405 BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
406
407 del_timer(&conn->idle_timer);
408
409 del_timer(&conn->disc_timer);
410
411 del_timer(&conn->auto_accept_timer);
412
413 if (conn->type == ACL_LINK) {
414 struct hci_conn *sco = conn->link;
415 if (sco)
416 sco->link = NULL;
417
418 /* Unacked frames */
419 hdev->acl_cnt += conn->sent;
420 } else if (conn->type == LE_LINK) {
421 if (hdev->le_pkts)
422 hdev->le_cnt += conn->sent;
423 else
424 hdev->acl_cnt += conn->sent;
425 } else {
426 struct hci_conn *acl = conn->link;
427 if (acl) {
428 acl->link = NULL;
429 hci_conn_put(acl);
430 }
431 }
432
433 tasklet_disable(&hdev->tx_task);
434
435 hci_conn_hash_del(hdev, conn);
436 if (hdev->notify)
437 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
438
439 tasklet_enable(&hdev->tx_task);
440
441 skb_queue_purge(&conn->data_q);
442
443 hci_conn_put_device(conn);
444
445 hci_dev_put(hdev);
446
447 if (conn->handle == 0)
448 kfree(conn);
449
450 return 0;
451}
452
453struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
454{
455 int use_src = bacmp(src, BDADDR_ANY);
456 struct hci_dev *hdev = NULL;
457 struct list_head *p;
458
459 BT_DBG("%s -> %s", batostr(src), batostr(dst));
460
461 read_lock_bh(&hci_dev_list_lock);
462
463 list_for_each(p, &hci_dev_list) {
464 struct hci_dev *d = list_entry(p, struct hci_dev, list);
465
466 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
467 continue;
468
469 /* Simple routing:
470 * No source address - find interface with bdaddr != dst
471 * Source address - find interface with bdaddr == src
472 */
473
474 if (use_src) {
475 if (!bacmp(&d->bdaddr, src)) {
476 hdev = d; break;
477 }
478 } else {
479 if (bacmp(&d->bdaddr, dst)) {
480 hdev = d; break;
481 }
482 }
483 }
484
485 if (hdev)
486 hdev = hci_dev_hold(hdev);
487
488 read_unlock_bh(&hci_dev_list_lock);
489 return hdev;
490}
491EXPORT_SYMBOL(hci_get_route);
492
493/* Create SCO, ACL or LE connection.
494 * Device _must_ be locked */
495struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
496{
497 struct hci_conn *acl;
498 struct hci_conn *sco;
499 struct hci_conn *le;
500
501 BT_DBG("%s dst %s", hdev->name, batostr(dst));
502
503 if (type == LE_LINK) {
504 struct adv_entry *entry;
505
506 le = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
507 if (le)
508 return ERR_PTR(-EBUSY);
509
510 entry = hci_find_adv_entry(hdev, dst);
511 if (!entry)
512 return ERR_PTR(-EHOSTUNREACH);
513
514 le = hci_conn_add(hdev, LE_LINK, dst);
515 if (!le)
516 return ERR_PTR(-ENOMEM);
517
518 le->dst_type = entry->bdaddr_type;
519
520 hci_le_connect(le);
521
522 hci_conn_hold(le);
523
524 return le;
525 }
526
527 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
528 if (!acl) {
529 acl = hci_conn_add(hdev, ACL_LINK, dst);
530 if (!acl)
531 return NULL;
532 }
533
534 hci_conn_hold(acl);
535
536 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
537 acl->sec_level = BT_SECURITY_LOW;
538 acl->pending_sec_level = sec_level;
539 acl->auth_type = auth_type;
540 hci_acl_connect(acl);
541 }
542
543 if (type == ACL_LINK)
544 return acl;
545
546 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
547 if (!sco) {
548 sco = hci_conn_add(hdev, type, dst);
549 if (!sco) {
550 hci_conn_put(acl);
551 return NULL;
552 }
553 }
554
555 acl->link = sco;
556 sco->link = acl;
557
558 hci_conn_hold(sco);
559
560 if (acl->state == BT_CONNECTED &&
561 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
562 acl->power_save = 1;
563 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
564
565 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->pend)) {
566 /* defer SCO setup until mode change completed */
567 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->pend);
568 return sco;
569 }
570
571 hci_sco_setup(acl, 0x00);
572 }
573
574 return sco;
575}
576EXPORT_SYMBOL(hci_connect);
577
578/* Check link security requirement */
579int hci_conn_check_link_mode(struct hci_conn *conn)
580{
581 BT_DBG("conn %p", conn);
582
583 if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
584 !(conn->link_mode & HCI_LM_ENCRYPT))
585 return 0;
586
587 return 1;
588}
589EXPORT_SYMBOL(hci_conn_check_link_mode);
590
591/* Authenticate remote device */
592static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
593{
594 BT_DBG("conn %p", conn);
595
596 if (conn->pending_sec_level > sec_level)
597 sec_level = conn->pending_sec_level;
598
599 if (sec_level > conn->sec_level)
600 conn->pending_sec_level = sec_level;
601 else if (conn->link_mode & HCI_LM_AUTH)
602 return 1;
603
604 /* Make sure we preserve an existing MITM requirement*/
605 auth_type |= (conn->auth_type & 0x01);
606
607 conn->auth_type = auth_type;
608
609 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
610 struct hci_cp_auth_requested cp;
611 cp.handle = cpu_to_le16(conn->handle);
612 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
613 sizeof(cp), &cp);
614 if (conn->key_type != 0xff)
615 set_bit(HCI_CONN_REAUTH_PEND, &conn->pend);
616 }
617
618 return 0;
619}
620
621/* Encrypt the the link */
622static void hci_conn_encrypt(struct hci_conn *conn)
623{
624 BT_DBG("conn %p", conn);
625
626 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) {
627 struct hci_cp_set_conn_encrypt cp;
628 cp.handle = cpu_to_le16(conn->handle);
629 cp.encrypt = 0x01;
630 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
631 &cp);
632 }
633}
634
635/* Enable security */
636int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
637{
638 BT_DBG("conn %p", conn);
639
640 /* For sdp we don't need the link key. */
641 if (sec_level == BT_SECURITY_SDP)
642 return 1;
643
644 /* For non 2.1 devices and low security level we don't need the link
645 key. */
646 if (sec_level == BT_SECURITY_LOW &&
647 (!conn->ssp_mode || !conn->hdev->ssp_mode))
648 return 1;
649
650 /* For other security levels we need the link key. */
651 if (!(conn->link_mode & HCI_LM_AUTH))
652 goto auth;
653
654 /* An authenticated combination key has sufficient security for any
655 security level. */
656 if (conn->key_type == HCI_LK_AUTH_COMBINATION)
657 goto encrypt;
658
659 /* An unauthenticated combination key has sufficient security for
660 security level 1 and 2. */
661 if (conn->key_type == HCI_LK_UNAUTH_COMBINATION &&
662 (sec_level == BT_SECURITY_MEDIUM ||
663 sec_level == BT_SECURITY_LOW))
664 goto encrypt;
665
666 /* A combination key has always sufficient security for the security
667 levels 1 or 2. High security level requires the combination key
668 is generated using maximum PIN code length (16).
669 For pre 2.1 units. */
670 if (conn->key_type == HCI_LK_COMBINATION &&
671 (sec_level != BT_SECURITY_HIGH ||
672 conn->pin_length == 16))
673 goto encrypt;
674
675auth:
676 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
677 return 0;
678
679 if (!hci_conn_auth(conn, sec_level, auth_type))
680 return 0;
681
682encrypt:
683 if (conn->link_mode & HCI_LM_ENCRYPT)
684 return 1;
685
686 hci_conn_encrypt(conn);
687 return 0;
688}
689EXPORT_SYMBOL(hci_conn_security);
690
691/* Check secure link requirement */
692int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
693{
694 BT_DBG("conn %p", conn);
695
696 if (sec_level != BT_SECURITY_HIGH)
697 return 1; /* Accept if non-secure is required */
698
699 if (conn->sec_level == BT_SECURITY_HIGH)
700 return 1;
701
702 return 0; /* Reject not secure link */
703}
704EXPORT_SYMBOL(hci_conn_check_secure);
705
706/* Change link key */
707int hci_conn_change_link_key(struct hci_conn *conn)
708{
709 BT_DBG("conn %p", conn);
710
711 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
712 struct hci_cp_change_conn_link_key cp;
713 cp.handle = cpu_to_le16(conn->handle);
714 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
715 sizeof(cp), &cp);
716 }
717
718 return 0;
719}
720EXPORT_SYMBOL(hci_conn_change_link_key);
721
722/* Switch role */
723int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
724{
725 BT_DBG("conn %p", conn);
726
727 if (!role && conn->link_mode & HCI_LM_MASTER)
728 return 1;
729
730 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
731 struct hci_cp_switch_role cp;
732 bacpy(&cp.bdaddr, &conn->dst);
733 cp.role = role;
734 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
735 }
736
737 return 0;
738}
739EXPORT_SYMBOL(hci_conn_switch_role);
740
741/* Enter active mode */
742void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
743{
744 struct hci_dev *hdev = conn->hdev;
745
746 BT_DBG("conn %p mode %d", conn, conn->mode);
747
748 if (test_bit(HCI_RAW, &hdev->flags))
749 return;
750
751 if (conn->mode != HCI_CM_SNIFF)
752 goto timer;
753
754 if (!conn->power_save && !force_active)
755 goto timer;
756
757 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
758 struct hci_cp_exit_sniff_mode cp;
759 cp.handle = cpu_to_le16(conn->handle);
760 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
761 }
762
763timer:
764 if (hdev->idle_timeout > 0)
765 mod_timer(&conn->idle_timer,
766 jiffies + msecs_to_jiffies(hdev->idle_timeout));
767}
768
769/* Enter sniff mode */
770void hci_conn_enter_sniff_mode(struct hci_conn *conn)
771{
772 struct hci_dev *hdev = conn->hdev;
773
774 BT_DBG("conn %p mode %d", conn, conn->mode);
775
776 if (test_bit(HCI_RAW, &hdev->flags))
777 return;
778
779 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
780 return;
781
782 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
783 return;
784
785 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
786 struct hci_cp_sniff_subrate cp;
787 cp.handle = cpu_to_le16(conn->handle);
788 cp.max_latency = cpu_to_le16(0);
789 cp.min_remote_timeout = cpu_to_le16(0);
790 cp.min_local_timeout = cpu_to_le16(0);
791 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
792 }
793
794 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
795 struct hci_cp_sniff_mode cp;
796 cp.handle = cpu_to_le16(conn->handle);
797 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
798 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
799 cp.attempt = cpu_to_le16(4);
800 cp.timeout = cpu_to_le16(1);
801 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
802 }
803}
804
805/* Drop all connection on the device */
806void hci_conn_hash_flush(struct hci_dev *hdev)
807{
808 struct hci_conn_hash *h = &hdev->conn_hash;
809 struct list_head *p;
810
811 BT_DBG("hdev %s", hdev->name);
812
813 p = h->list.next;
814 while (p != &h->list) {
815 struct hci_conn *c;
816
817 c = list_entry(p, struct hci_conn, list);
818 p = p->next;
819
820 c->state = BT_CLOSED;
821
822 hci_proto_disconn_cfm(c, 0x16);
823 hci_conn_del(c);
824 }
825}
826
827/* Check pending connect attempts */
828void hci_conn_check_pending(struct hci_dev *hdev)
829{
830 struct hci_conn *conn;
831
832 BT_DBG("hdev %s", hdev->name);
833
834 hci_dev_lock(hdev);
835
836 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
837 if (conn)
838 hci_acl_connect(conn);
839
840 hci_dev_unlock(hdev);
841}
842
843void hci_conn_hold_device(struct hci_conn *conn)
844{
845 atomic_inc(&conn->devref);
846}
847EXPORT_SYMBOL(hci_conn_hold_device);
848
849void hci_conn_put_device(struct hci_conn *conn)
850{
851 if (atomic_dec_and_test(&conn->devref))
852 hci_conn_del_sysfs(conn);
853}
854EXPORT_SYMBOL(hci_conn_put_device);
855
856int hci_get_conn_list(void __user *arg)
857{
858 struct hci_conn_list_req req, *cl;
859 struct hci_conn_info *ci;
860 struct hci_dev *hdev;
861 struct list_head *p;
862 int n = 0, size, err;
863
864 if (copy_from_user(&req, arg, sizeof(req)))
865 return -EFAULT;
866
867 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
868 return -EINVAL;
869
870 size = sizeof(req) + req.conn_num * sizeof(*ci);
871
872 cl = kmalloc(size, GFP_KERNEL);
873 if (!cl)
874 return -ENOMEM;
875
876 hdev = hci_dev_get(req.dev_id);
877 if (!hdev) {
878 kfree(cl);
879 return -ENODEV;
880 }
881
882 ci = cl->conn_info;
883
884 hci_dev_lock_bh(hdev);
885 list_for_each(p, &hdev->conn_hash.list) {
886 register struct hci_conn *c;
887 c = list_entry(p, struct hci_conn, list);
888
889 bacpy(&(ci + n)->bdaddr, &c->dst);
890 (ci + n)->handle = c->handle;
891 (ci + n)->type = c->type;
892 (ci + n)->out = c->out;
893 (ci + n)->state = c->state;
894 (ci + n)->link_mode = c->link_mode;
895 if (++n >= req.conn_num)
896 break;
897 }
898 hci_dev_unlock_bh(hdev);
899
900 cl->dev_id = hdev->id;
901 cl->conn_num = n;
902 size = sizeof(req) + n * sizeof(*ci);
903
904 hci_dev_put(hdev);
905
906 err = copy_to_user(arg, cl, size);
907 kfree(cl);
908
909 return err ? -EFAULT : 0;
910}
911
912int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
913{
914 struct hci_conn_info_req req;
915 struct hci_conn_info ci;
916 struct hci_conn *conn;
917 char __user *ptr = arg + sizeof(req);
918
919 if (copy_from_user(&req, arg, sizeof(req)))
920 return -EFAULT;
921
922 hci_dev_lock_bh(hdev);
923 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
924 if (conn) {
925 bacpy(&ci.bdaddr, &conn->dst);
926 ci.handle = conn->handle;
927 ci.type = conn->type;
928 ci.out = conn->out;
929 ci.state = conn->state;
930 ci.link_mode = conn->link_mode;
931 }
932 hci_dev_unlock_bh(hdev);
933
934 if (!conn)
935 return -ENOENT;
936
937 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
938}
939
940int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
941{
942 struct hci_auth_info_req req;
943 struct hci_conn *conn;
944
945 if (copy_from_user(&req, arg, sizeof(req)))
946 return -EFAULT;
947
948 hci_dev_lock_bh(hdev);
949 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
950 if (conn)
951 req.type = conn->auth_type;
952 hci_dev_unlock_bh(hdev);
953
954 if (!conn)
955 return -ENOENT;
956
957 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
958}