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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 /* Set Default Authenticated payload timeout to 30s */
524 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
525
526 if (conn->role == HCI_ROLE_MASTER)
527 conn->out = true;
528
529 switch (type) {
530 case ACL_LINK:
531 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
532 break;
533 case LE_LINK:
534 /* conn->src should reflect the local identity address */
535 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
536 break;
537 case SCO_LINK:
538 if (lmp_esco_capable(hdev))
539 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
540 (hdev->esco_type & EDR_ESCO_MASK);
541 else
542 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
543 break;
544 case ESCO_LINK:
545 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
546 break;
547 }
548
549 skb_queue_head_init(&conn->data_q);
550
551 INIT_LIST_HEAD(&conn->chan_list);
552
553 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
554 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
555 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
556 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
557 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
558
559 atomic_set(&conn->refcnt, 0);
560
561 hci_dev_hold(hdev);
562
563 hci_conn_hash_add(hdev, conn);
564 if (hdev->notify)
565 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
566
567 hci_conn_init_sysfs(conn);
568
569 return conn;
570}
571
572int hci_conn_del(struct hci_conn *conn)
573{
574 struct hci_dev *hdev = conn->hdev;
575
576 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
577
578 cancel_delayed_work_sync(&conn->disc_work);
579 cancel_delayed_work_sync(&conn->auto_accept_work);
580 cancel_delayed_work_sync(&conn->idle_work);
581
582 if (conn->type == ACL_LINK) {
583 struct hci_conn *sco = conn->link;
584 if (sco)
585 sco->link = NULL;
586
587 /* Unacked frames */
588 hdev->acl_cnt += conn->sent;
589 } else if (conn->type == LE_LINK) {
590 cancel_delayed_work(&conn->le_conn_timeout);
591
592 if (hdev->le_pkts)
593 hdev->le_cnt += conn->sent;
594 else
595 hdev->acl_cnt += conn->sent;
596 } else {
597 struct hci_conn *acl = conn->link;
598 if (acl) {
599 acl->link = NULL;
600 hci_conn_drop(acl);
601 }
602 }
603
604 if (conn->amp_mgr)
605 amp_mgr_put(conn->amp_mgr);
606
607 skb_queue_purge(&conn->data_q);
608
609 /* Remove the connection from the list and cleanup its remaining
610 * state. This is a separate function since for some cases like
611 * BT_CONNECT_SCAN we *only* want the cleanup part without the
612 * rest of hci_conn_del.
613 */
614 hci_conn_cleanup(conn);
615
616 return 0;
617}
618
619struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
620{
621 int use_src = bacmp(src, BDADDR_ANY);
622 struct hci_dev *hdev = NULL, *d;
623
624 BT_DBG("%pMR -> %pMR", src, dst);
625
626 read_lock(&hci_dev_list_lock);
627
628 list_for_each_entry(d, &hci_dev_list, list) {
629 if (!test_bit(HCI_UP, &d->flags) ||
630 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
631 d->dev_type != HCI_PRIMARY)
632 continue;
633
634 /* Simple routing:
635 * No source address - find interface with bdaddr != dst
636 * Source address - find interface with bdaddr == src
637 */
638
639 if (use_src) {
640 bdaddr_t id_addr;
641 u8 id_addr_type;
642
643 if (src_type == BDADDR_BREDR) {
644 if (!lmp_bredr_capable(d))
645 continue;
646 bacpy(&id_addr, &d->bdaddr);
647 id_addr_type = BDADDR_BREDR;
648 } else {
649 if (!lmp_le_capable(d))
650 continue;
651
652 hci_copy_identity_address(d, &id_addr,
653 &id_addr_type);
654
655 /* Convert from HCI to three-value type */
656 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
657 id_addr_type = BDADDR_LE_PUBLIC;
658 else
659 id_addr_type = BDADDR_LE_RANDOM;
660 }
661
662 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
663 hdev = d; break;
664 }
665 } else {
666 if (bacmp(&d->bdaddr, dst)) {
667 hdev = d; break;
668 }
669 }
670 }
671
672 if (hdev)
673 hdev = hci_dev_hold(hdev);
674
675 read_unlock(&hci_dev_list_lock);
676 return hdev;
677}
678EXPORT_SYMBOL(hci_get_route);
679
680/* This function requires the caller holds hdev->lock */
681void hci_le_conn_failed(struct hci_conn *conn, u8 status)
682{
683 struct hci_dev *hdev = conn->hdev;
684 struct hci_conn_params *params;
685
686 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
687 conn->dst_type);
688 if (params && params->conn) {
689 hci_conn_drop(params->conn);
690 hci_conn_put(params->conn);
691 params->conn = NULL;
692 }
693
694 conn->state = BT_CLOSED;
695
696 /* If the status indicates successful cancellation of
697 * the attempt (i.e. Unkown Connection Id) there's no point of
698 * notifying failure since we'll go back to keep trying to
699 * connect. The only exception is explicit connect requests
700 * where a timeout + cancel does indicate an actual failure.
701 */
702 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
703 (params && params->explicit_connect))
704 mgmt_connect_failed(hdev, &conn->dst, conn->type,
705 conn->dst_type, status);
706
707 hci_connect_cfm(conn, status);
708
709 hci_conn_del(conn);
710
711 /* Since we may have temporarily stopped the background scanning in
712 * favor of connection establishment, we should restart it.
713 */
714 hci_update_background_scan(hdev);
715
716 /* Re-enable advertising in case this was a failed connection
717 * attempt as a peripheral.
718 */
719 hci_req_reenable_advertising(hdev);
720}
721
722static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
723{
724 struct hci_conn *conn;
725
726 hci_dev_lock(hdev);
727
728 conn = hci_lookup_le_connect(hdev);
729
730 if (!status) {
731 hci_connect_le_scan_cleanup(conn);
732 goto done;
733 }
734
735 bt_dev_err(hdev, "request failed to create LE connection: "
736 "status 0x%2.2x", status);
737
738 if (!conn)
739 goto done;
740
741 hci_le_conn_failed(conn, status);
742
743done:
744 hci_dev_unlock(hdev);
745}
746
747static bool conn_use_rpa(struct hci_conn *conn)
748{
749 struct hci_dev *hdev = conn->hdev;
750
751 return hci_dev_test_flag(hdev, HCI_PRIVACY);
752}
753
754static void set_ext_conn_params(struct hci_conn *conn,
755 struct hci_cp_le_ext_conn_param *p)
756{
757 struct hci_dev *hdev = conn->hdev;
758
759 memset(p, 0, sizeof(*p));
760
761 /* Set window to be the same value as the interval to
762 * enable continuous scanning.
763 */
764 p->scan_interval = cpu_to_le16(hdev->le_scan_interval);
765 p->scan_window = p->scan_interval;
766 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
767 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
768 p->conn_latency = cpu_to_le16(conn->le_conn_latency);
769 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
770 p->min_ce_len = cpu_to_le16(0x0000);
771 p->max_ce_len = cpu_to_le16(0x0000);
772}
773
774static void hci_req_add_le_create_conn(struct hci_request *req,
775 struct hci_conn *conn,
776 bdaddr_t *direct_rpa)
777{
778 struct hci_dev *hdev = conn->hdev;
779 u8 own_addr_type;
780
781 /* If direct address was provided we use it instead of current
782 * address.
783 */
784 if (direct_rpa) {
785 if (bacmp(&req->hdev->random_addr, direct_rpa))
786 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
787 direct_rpa);
788
789 /* direct address is always RPA */
790 own_addr_type = ADDR_LE_DEV_RANDOM;
791 } else {
792 /* Update random address, but set require_privacy to false so
793 * that we never connect with an non-resolvable address.
794 */
795 if (hci_update_random_address(req, false, conn_use_rpa(conn),
796 &own_addr_type))
797 return;
798 }
799
800 if (use_ext_conn(hdev)) {
801 struct hci_cp_le_ext_create_conn *cp;
802 struct hci_cp_le_ext_conn_param *p;
803 u8 data[sizeof(*cp) + sizeof(*p) * 3];
804 u32 plen;
805
806 cp = (void *) data;
807 p = (void *) cp->data;
808
809 memset(cp, 0, sizeof(*cp));
810
811 bacpy(&cp->peer_addr, &conn->dst);
812 cp->peer_addr_type = conn->dst_type;
813 cp->own_addr_type = own_addr_type;
814
815 plen = sizeof(*cp);
816
817 if (scan_1m(hdev)) {
818 cp->phys |= LE_SCAN_PHY_1M;
819 set_ext_conn_params(conn, p);
820
821 p++;
822 plen += sizeof(*p);
823 }
824
825 if (scan_2m(hdev)) {
826 cp->phys |= LE_SCAN_PHY_2M;
827 set_ext_conn_params(conn, p);
828
829 p++;
830 plen += sizeof(*p);
831 }
832
833 if (scan_coded(hdev)) {
834 cp->phys |= LE_SCAN_PHY_CODED;
835 set_ext_conn_params(conn, p);
836
837 plen += sizeof(*p);
838 }
839
840 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
841
842 } else {
843 struct hci_cp_le_create_conn cp;
844
845 memset(&cp, 0, sizeof(cp));
846
847 /* Set window to be the same value as the interval to enable
848 * continuous scanning.
849 */
850 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
851 cp.scan_window = cp.scan_interval;
852
853 bacpy(&cp.peer_addr, &conn->dst);
854 cp.peer_addr_type = conn->dst_type;
855 cp.own_address_type = own_addr_type;
856 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
857 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
858 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
859 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
860 cp.min_ce_len = cpu_to_le16(0x0000);
861 cp.max_ce_len = cpu_to_le16(0x0000);
862
863 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
864 }
865
866 conn->state = BT_CONNECT;
867 clear_bit(HCI_CONN_SCANNING, &conn->flags);
868}
869
870static void hci_req_directed_advertising(struct hci_request *req,
871 struct hci_conn *conn)
872{
873 struct hci_dev *hdev = req->hdev;
874 u8 own_addr_type;
875 u8 enable;
876
877 if (ext_adv_capable(hdev)) {
878 struct hci_cp_le_set_ext_adv_params cp;
879 bdaddr_t random_addr;
880
881 /* Set require_privacy to false so that the remote device has a
882 * chance of identifying us.
883 */
884 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
885 &own_addr_type, &random_addr) < 0)
886 return;
887
888 memset(&cp, 0, sizeof(cp));
889
890 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
891 cp.own_addr_type = own_addr_type;
892 cp.channel_map = hdev->le_adv_channel_map;
893 cp.tx_power = HCI_TX_POWER_INVALID;
894 cp.primary_phy = HCI_ADV_PHY_1M;
895 cp.secondary_phy = HCI_ADV_PHY_1M;
896 cp.handle = 0; /* Use instance 0 for directed adv */
897 cp.own_addr_type = own_addr_type;
898 cp.peer_addr_type = conn->dst_type;
899 bacpy(&cp.peer_addr, &conn->dst);
900
901 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
902
903 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
904 bacmp(&random_addr, BDADDR_ANY) &&
905 bacmp(&random_addr, &hdev->random_addr)) {
906 struct hci_cp_le_set_adv_set_rand_addr cp;
907
908 memset(&cp, 0, sizeof(cp));
909
910 cp.handle = 0;
911 bacpy(&cp.bdaddr, &random_addr);
912
913 hci_req_add(req,
914 HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
915 sizeof(cp), &cp);
916 }
917
918 __hci_req_enable_ext_advertising(req, 0x00);
919 } else {
920 struct hci_cp_le_set_adv_param cp;
921
922 /* Clear the HCI_LE_ADV bit temporarily so that the
923 * hci_update_random_address knows that it's safe to go ahead
924 * and write a new random address. The flag will be set back on
925 * as soon as the SET_ADV_ENABLE HCI command completes.
926 */
927 hci_dev_clear_flag(hdev, HCI_LE_ADV);
928
929 /* Set require_privacy to false so that the remote device has a
930 * chance of identifying us.
931 */
932 if (hci_update_random_address(req, false, conn_use_rpa(conn),
933 &own_addr_type) < 0)
934 return;
935
936 memset(&cp, 0, sizeof(cp));
937 cp.type = LE_ADV_DIRECT_IND;
938 cp.own_address_type = own_addr_type;
939 cp.direct_addr_type = conn->dst_type;
940 bacpy(&cp.direct_addr, &conn->dst);
941 cp.channel_map = hdev->le_adv_channel_map;
942
943 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
944
945 enable = 0x01;
946 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
947 &enable);
948 }
949
950 conn->state = BT_CONNECT;
951}
952
953struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
954 u8 dst_type, u8 sec_level, u16 conn_timeout,
955 u8 role, bdaddr_t *direct_rpa)
956{
957 struct hci_conn_params *params;
958 struct hci_conn *conn;
959 struct smp_irk *irk;
960 struct hci_request req;
961 int err;
962
963 /* Let's make sure that le is enabled.*/
964 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
965 if (lmp_le_capable(hdev))
966 return ERR_PTR(-ECONNREFUSED);
967
968 return ERR_PTR(-EOPNOTSUPP);
969 }
970
971 /* Since the controller supports only one LE connection attempt at a
972 * time, we return -EBUSY if there is any connection attempt running.
973 */
974 if (hci_lookup_le_connect(hdev))
975 return ERR_PTR(-EBUSY);
976
977 /* If there's already a connection object but it's not in
978 * scanning state it means it must already be established, in
979 * which case we can't do anything else except report a failure
980 * to connect.
981 */
982 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
983 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
984 return ERR_PTR(-EBUSY);
985 }
986
987 /* When given an identity address with existing identity
988 * resolving key, the connection needs to be established
989 * to a resolvable random address.
990 *
991 * Storing the resolvable random address is required here
992 * to handle connection failures. The address will later
993 * be resolved back into the original identity address
994 * from the connect request.
995 */
996 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
997 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
998 dst = &irk->rpa;
999 dst_type = ADDR_LE_DEV_RANDOM;
1000 }
1001
1002 if (conn) {
1003 bacpy(&conn->dst, dst);
1004 } else {
1005 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1006 if (!conn)
1007 return ERR_PTR(-ENOMEM);
1008 hci_conn_hold(conn);
1009 conn->pending_sec_level = sec_level;
1010 }
1011
1012 conn->dst_type = dst_type;
1013 conn->sec_level = BT_SECURITY_LOW;
1014 conn->conn_timeout = conn_timeout;
1015
1016 hci_req_init(&req, hdev);
1017
1018 /* Disable advertising if we're active. For master role
1019 * connections most controllers will refuse to connect if
1020 * advertising is enabled, and for slave role connections we
1021 * anyway have to disable it in order to start directed
1022 * advertising.
1023 */
1024 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
1025 u8 enable = 0x00;
1026 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1027 &enable);
1028 }
1029
1030 /* If requested to connect as slave use directed advertising */
1031 if (conn->role == HCI_ROLE_SLAVE) {
1032 /* If we're active scanning most controllers are unable
1033 * to initiate advertising. Simply reject the attempt.
1034 */
1035 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1036 hdev->le_scan_type == LE_SCAN_ACTIVE) {
1037 hci_req_purge(&req);
1038 hci_conn_del(conn);
1039 return ERR_PTR(-EBUSY);
1040 }
1041
1042 hci_req_directed_advertising(&req, conn);
1043 goto create_conn;
1044 }
1045
1046 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1047 if (params) {
1048 conn->le_conn_min_interval = params->conn_min_interval;
1049 conn->le_conn_max_interval = params->conn_max_interval;
1050 conn->le_conn_latency = params->conn_latency;
1051 conn->le_supv_timeout = params->supervision_timeout;
1052 } else {
1053 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1054 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1055 conn->le_conn_latency = hdev->le_conn_latency;
1056 conn->le_supv_timeout = hdev->le_supv_timeout;
1057 }
1058
1059 /* If controller is scanning, we stop it since some controllers are
1060 * not able to scan and connect at the same time. Also set the
1061 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1062 * handler for scan disabling knows to set the correct discovery
1063 * state.
1064 */
1065 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1066 hci_req_add_le_scan_disable(&req);
1067 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1068 }
1069
1070 hci_req_add_le_create_conn(&req, conn, direct_rpa);
1071
1072create_conn:
1073 err = hci_req_run(&req, create_le_conn_complete);
1074 if (err) {
1075 hci_conn_del(conn);
1076 return ERR_PTR(err);
1077 }
1078
1079 return conn;
1080}
1081
1082static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1083{
1084 struct hci_conn *conn;
1085
1086 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1087 if (!conn)
1088 return false;
1089
1090 if (conn->state != BT_CONNECTED)
1091 return false;
1092
1093 return true;
1094}
1095
1096/* This function requires the caller holds hdev->lock */
1097static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1098 bdaddr_t *addr, u8 addr_type)
1099{
1100 struct hci_conn_params *params;
1101
1102 if (is_connected(hdev, addr, addr_type))
1103 return -EISCONN;
1104
1105 params = hci_conn_params_lookup(hdev, addr, addr_type);
1106 if (!params) {
1107 params = hci_conn_params_add(hdev, addr, addr_type);
1108 if (!params)
1109 return -ENOMEM;
1110
1111 /* If we created new params, mark them to be deleted in
1112 * hci_connect_le_scan_cleanup. It's different case than
1113 * existing disabled params, those will stay after cleanup.
1114 */
1115 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1116 }
1117
1118 /* We're trying to connect, so make sure params are at pend_le_conns */
1119 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1120 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1121 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1122 list_del_init(¶ms->action);
1123 list_add(¶ms->action, &hdev->pend_le_conns);
1124 }
1125
1126 params->explicit_connect = true;
1127
1128 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1129 params->auto_connect);
1130
1131 return 0;
1132}
1133
1134/* This function requires the caller holds hdev->lock */
1135struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1136 u8 dst_type, u8 sec_level,
1137 u16 conn_timeout)
1138{
1139 struct hci_conn *conn;
1140
1141 /* Let's make sure that le is enabled.*/
1142 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1143 if (lmp_le_capable(hdev))
1144 return ERR_PTR(-ECONNREFUSED);
1145
1146 return ERR_PTR(-EOPNOTSUPP);
1147 }
1148
1149 /* Some devices send ATT messages as soon as the physical link is
1150 * established. To be able to handle these ATT messages, the user-
1151 * space first establishes the connection and then starts the pairing
1152 * process.
1153 *
1154 * So if a hci_conn object already exists for the following connection
1155 * attempt, we simply update pending_sec_level and auth_type fields
1156 * and return the object found.
1157 */
1158 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1159 if (conn) {
1160 if (conn->pending_sec_level < sec_level)
1161 conn->pending_sec_level = sec_level;
1162 goto done;
1163 }
1164
1165 BT_DBG("requesting refresh of dst_addr");
1166
1167 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1168 if (!conn)
1169 return ERR_PTR(-ENOMEM);
1170
1171 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1172 return ERR_PTR(-EBUSY);
1173
1174 conn->state = BT_CONNECT;
1175 set_bit(HCI_CONN_SCANNING, &conn->flags);
1176 conn->dst_type = dst_type;
1177 conn->sec_level = BT_SECURITY_LOW;
1178 conn->pending_sec_level = sec_level;
1179 conn->conn_timeout = conn_timeout;
1180
1181 hci_update_background_scan(hdev);
1182
1183done:
1184 hci_conn_hold(conn);
1185 return conn;
1186}
1187
1188struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1189 u8 sec_level, u8 auth_type)
1190{
1191 struct hci_conn *acl;
1192
1193 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1194 if (lmp_bredr_capable(hdev))
1195 return ERR_PTR(-ECONNREFUSED);
1196
1197 return ERR_PTR(-EOPNOTSUPP);
1198 }
1199
1200 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1201 if (!acl) {
1202 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1203 if (!acl)
1204 return ERR_PTR(-ENOMEM);
1205 }
1206
1207 hci_conn_hold(acl);
1208
1209 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1210 acl->sec_level = BT_SECURITY_LOW;
1211 acl->pending_sec_level = sec_level;
1212 acl->auth_type = auth_type;
1213 hci_acl_create_connection(acl);
1214 }
1215
1216 return acl;
1217}
1218
1219struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1220 __u16 setting)
1221{
1222 struct hci_conn *acl;
1223 struct hci_conn *sco;
1224
1225 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1226 if (IS_ERR(acl))
1227 return acl;
1228
1229 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1230 if (!sco) {
1231 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1232 if (!sco) {
1233 hci_conn_drop(acl);
1234 return ERR_PTR(-ENOMEM);
1235 }
1236 }
1237
1238 acl->link = sco;
1239 sco->link = acl;
1240
1241 hci_conn_hold(sco);
1242
1243 sco->setting = setting;
1244
1245 if (acl->state == BT_CONNECTED &&
1246 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1247 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1248 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1249
1250 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1251 /* defer SCO setup until mode change completed */
1252 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1253 return sco;
1254 }
1255
1256 hci_sco_setup(acl, 0x00);
1257 }
1258
1259 return sco;
1260}
1261
1262/* Check link security requirement */
1263int hci_conn_check_link_mode(struct hci_conn *conn)
1264{
1265 BT_DBG("hcon %p", conn);
1266
1267 /* In Secure Connections Only mode, it is required that Secure
1268 * Connections is used and the link is encrypted with AES-CCM
1269 * using a P-256 authenticated combination key.
1270 */
1271 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1272 if (!hci_conn_sc_enabled(conn) ||
1273 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1274 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1275 return 0;
1276 }
1277
1278 if (hci_conn_ssp_enabled(conn) &&
1279 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1280 return 0;
1281
1282 return 1;
1283}
1284
1285/* Authenticate remote device */
1286static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1287{
1288 BT_DBG("hcon %p", conn);
1289
1290 if (conn->pending_sec_level > sec_level)
1291 sec_level = conn->pending_sec_level;
1292
1293 if (sec_level > conn->sec_level)
1294 conn->pending_sec_level = sec_level;
1295 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1296 return 1;
1297
1298 /* Make sure we preserve an existing MITM requirement*/
1299 auth_type |= (conn->auth_type & 0x01);
1300
1301 conn->auth_type = auth_type;
1302
1303 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1304 struct hci_cp_auth_requested cp;
1305
1306 cp.handle = cpu_to_le16(conn->handle);
1307 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1308 sizeof(cp), &cp);
1309
1310 /* If we're already encrypted set the REAUTH_PEND flag,
1311 * otherwise set the ENCRYPT_PEND.
1312 */
1313 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1314 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1315 else
1316 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1317 }
1318
1319 return 0;
1320}
1321
1322/* Encrypt the the link */
1323static void hci_conn_encrypt(struct hci_conn *conn)
1324{
1325 BT_DBG("hcon %p", conn);
1326
1327 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1328 struct hci_cp_set_conn_encrypt cp;
1329 cp.handle = cpu_to_le16(conn->handle);
1330 cp.encrypt = 0x01;
1331 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1332 &cp);
1333 }
1334}
1335
1336/* Enable security */
1337int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1338 bool initiator)
1339{
1340 BT_DBG("hcon %p", conn);
1341
1342 if (conn->type == LE_LINK)
1343 return smp_conn_security(conn, sec_level);
1344
1345 /* For sdp we don't need the link key. */
1346 if (sec_level == BT_SECURITY_SDP)
1347 return 1;
1348
1349 /* For non 2.1 devices and low security level we don't need the link
1350 key. */
1351 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1352 return 1;
1353
1354 /* For other security levels we need the link key. */
1355 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1356 goto auth;
1357
1358 /* An authenticated FIPS approved combination key has sufficient
1359 * security for security level 4. */
1360 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1361 sec_level == BT_SECURITY_FIPS)
1362 goto encrypt;
1363
1364 /* An authenticated combination key has sufficient security for
1365 security level 3. */
1366 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1367 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1368 sec_level == BT_SECURITY_HIGH)
1369 goto encrypt;
1370
1371 /* An unauthenticated combination key has sufficient security for
1372 security level 1 and 2. */
1373 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1374 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1375 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1376 goto encrypt;
1377
1378 /* A combination key has always sufficient security for the security
1379 levels 1 or 2. High security level requires the combination key
1380 is generated using maximum PIN code length (16).
1381 For pre 2.1 units. */
1382 if (conn->key_type == HCI_LK_COMBINATION &&
1383 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1384 conn->pin_length == 16))
1385 goto encrypt;
1386
1387auth:
1388 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1389 return 0;
1390
1391 if (initiator)
1392 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1393
1394 if (!hci_conn_auth(conn, sec_level, auth_type))
1395 return 0;
1396
1397encrypt:
1398 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1399 /* Ensure that the encryption key size has been read,
1400 * otherwise stall the upper layer responses.
1401 */
1402 if (!conn->enc_key_size)
1403 return 0;
1404
1405 /* Nothing else needed, all requirements are met */
1406 return 1;
1407 }
1408
1409 hci_conn_encrypt(conn);
1410 return 0;
1411}
1412EXPORT_SYMBOL(hci_conn_security);
1413
1414/* Check secure link requirement */
1415int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1416{
1417 BT_DBG("hcon %p", conn);
1418
1419 /* Accept if non-secure or higher security level is required */
1420 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1421 return 1;
1422
1423 /* Accept if secure or higher security level is already present */
1424 if (conn->sec_level == BT_SECURITY_HIGH ||
1425 conn->sec_level == BT_SECURITY_FIPS)
1426 return 1;
1427
1428 /* Reject not secure link */
1429 return 0;
1430}
1431EXPORT_SYMBOL(hci_conn_check_secure);
1432
1433/* Switch role */
1434int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1435{
1436 BT_DBG("hcon %p", conn);
1437
1438 if (role == conn->role)
1439 return 1;
1440
1441 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1442 struct hci_cp_switch_role cp;
1443 bacpy(&cp.bdaddr, &conn->dst);
1444 cp.role = role;
1445 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1446 }
1447
1448 return 0;
1449}
1450EXPORT_SYMBOL(hci_conn_switch_role);
1451
1452/* Enter active mode */
1453void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1454{
1455 struct hci_dev *hdev = conn->hdev;
1456
1457 BT_DBG("hcon %p mode %d", conn, conn->mode);
1458
1459 if (conn->mode != HCI_CM_SNIFF)
1460 goto timer;
1461
1462 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1463 goto timer;
1464
1465 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1466 struct hci_cp_exit_sniff_mode cp;
1467 cp.handle = cpu_to_le16(conn->handle);
1468 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1469 }
1470
1471timer:
1472 if (hdev->idle_timeout > 0)
1473 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1474 msecs_to_jiffies(hdev->idle_timeout));
1475}
1476
1477/* Drop all connection on the device */
1478void hci_conn_hash_flush(struct hci_dev *hdev)
1479{
1480 struct hci_conn_hash *h = &hdev->conn_hash;
1481 struct hci_conn *c, *n;
1482
1483 BT_DBG("hdev %s", hdev->name);
1484
1485 list_for_each_entry_safe(c, n, &h->list, list) {
1486 c->state = BT_CLOSED;
1487
1488 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1489 hci_conn_del(c);
1490 }
1491}
1492
1493/* Check pending connect attempts */
1494void hci_conn_check_pending(struct hci_dev *hdev)
1495{
1496 struct hci_conn *conn;
1497
1498 BT_DBG("hdev %s", hdev->name);
1499
1500 hci_dev_lock(hdev);
1501
1502 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1503 if (conn)
1504 hci_acl_create_connection(conn);
1505
1506 hci_dev_unlock(hdev);
1507}
1508
1509static u32 get_link_mode(struct hci_conn *conn)
1510{
1511 u32 link_mode = 0;
1512
1513 if (conn->role == HCI_ROLE_MASTER)
1514 link_mode |= HCI_LM_MASTER;
1515
1516 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1517 link_mode |= HCI_LM_ENCRYPT;
1518
1519 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1520 link_mode |= HCI_LM_AUTH;
1521
1522 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1523 link_mode |= HCI_LM_SECURE;
1524
1525 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1526 link_mode |= HCI_LM_FIPS;
1527
1528 return link_mode;
1529}
1530
1531int hci_get_conn_list(void __user *arg)
1532{
1533 struct hci_conn *c;
1534 struct hci_conn_list_req req, *cl;
1535 struct hci_conn_info *ci;
1536 struct hci_dev *hdev;
1537 int n = 0, size, err;
1538
1539 if (copy_from_user(&req, arg, sizeof(req)))
1540 return -EFAULT;
1541
1542 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1543 return -EINVAL;
1544
1545 size = sizeof(req) + req.conn_num * sizeof(*ci);
1546
1547 cl = kmalloc(size, GFP_KERNEL);
1548 if (!cl)
1549 return -ENOMEM;
1550
1551 hdev = hci_dev_get(req.dev_id);
1552 if (!hdev) {
1553 kfree(cl);
1554 return -ENODEV;
1555 }
1556
1557 ci = cl->conn_info;
1558
1559 hci_dev_lock(hdev);
1560 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1561 bacpy(&(ci + n)->bdaddr, &c->dst);
1562 (ci + n)->handle = c->handle;
1563 (ci + n)->type = c->type;
1564 (ci + n)->out = c->out;
1565 (ci + n)->state = c->state;
1566 (ci + n)->link_mode = get_link_mode(c);
1567 if (++n >= req.conn_num)
1568 break;
1569 }
1570 hci_dev_unlock(hdev);
1571
1572 cl->dev_id = hdev->id;
1573 cl->conn_num = n;
1574 size = sizeof(req) + n * sizeof(*ci);
1575
1576 hci_dev_put(hdev);
1577
1578 err = copy_to_user(arg, cl, size);
1579 kfree(cl);
1580
1581 return err ? -EFAULT : 0;
1582}
1583
1584int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1585{
1586 struct hci_conn_info_req req;
1587 struct hci_conn_info ci;
1588 struct hci_conn *conn;
1589 char __user *ptr = arg + sizeof(req);
1590
1591 if (copy_from_user(&req, arg, sizeof(req)))
1592 return -EFAULT;
1593
1594 hci_dev_lock(hdev);
1595 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1596 if (conn) {
1597 bacpy(&ci.bdaddr, &conn->dst);
1598 ci.handle = conn->handle;
1599 ci.type = conn->type;
1600 ci.out = conn->out;
1601 ci.state = conn->state;
1602 ci.link_mode = get_link_mode(conn);
1603 }
1604 hci_dev_unlock(hdev);
1605
1606 if (!conn)
1607 return -ENOENT;
1608
1609 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1610}
1611
1612int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1613{
1614 struct hci_auth_info_req req;
1615 struct hci_conn *conn;
1616
1617 if (copy_from_user(&req, arg, sizeof(req)))
1618 return -EFAULT;
1619
1620 hci_dev_lock(hdev);
1621 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1622 if (conn)
1623 req.type = conn->auth_type;
1624 hci_dev_unlock(hdev);
1625
1626 if (!conn)
1627 return -ENOENT;
1628
1629 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1630}
1631
1632struct hci_chan *hci_chan_create(struct hci_conn *conn)
1633{
1634 struct hci_dev *hdev = conn->hdev;
1635 struct hci_chan *chan;
1636
1637 BT_DBG("%s hcon %p", hdev->name, conn);
1638
1639 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1640 BT_DBG("Refusing to create new hci_chan");
1641 return NULL;
1642 }
1643
1644 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1645 if (!chan)
1646 return NULL;
1647
1648 chan->conn = hci_conn_get(conn);
1649 skb_queue_head_init(&chan->data_q);
1650 chan->state = BT_CONNECTED;
1651
1652 list_add_rcu(&chan->list, &conn->chan_list);
1653
1654 return chan;
1655}
1656
1657void hci_chan_del(struct hci_chan *chan)
1658{
1659 struct hci_conn *conn = chan->conn;
1660 struct hci_dev *hdev = conn->hdev;
1661
1662 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1663
1664 list_del_rcu(&chan->list);
1665
1666 synchronize_rcu();
1667
1668 /* Prevent new hci_chan's to be created for this hci_conn */
1669 set_bit(HCI_CONN_DROP, &conn->flags);
1670
1671 hci_conn_put(conn);
1672
1673 skb_queue_purge(&chan->data_q);
1674 kfree(chan);
1675}
1676
1677void hci_chan_list_flush(struct hci_conn *conn)
1678{
1679 struct hci_chan *chan, *n;
1680
1681 BT_DBG("hcon %p", conn);
1682
1683 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1684 hci_chan_del(chan);
1685}
1686
1687static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1688 __u16 handle)
1689{
1690 struct hci_chan *hchan;
1691
1692 list_for_each_entry(hchan, &hcon->chan_list, list) {
1693 if (hchan->handle == handle)
1694 return hchan;
1695 }
1696
1697 return NULL;
1698}
1699
1700struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1701{
1702 struct hci_conn_hash *h = &hdev->conn_hash;
1703 struct hci_conn *hcon;
1704 struct hci_chan *hchan = NULL;
1705
1706 rcu_read_lock();
1707
1708 list_for_each_entry_rcu(hcon, &h->list, list) {
1709 hchan = __hci_chan_lookup_handle(hcon, handle);
1710 if (hchan)
1711 break;
1712 }
1713
1714 rcu_read_unlock();
1715
1716 return hchan;
1717}
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth HCI connection handling. */
26
27#include <linux/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}