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
38 struct sco_param {
39 u16 pkt_type;
40 u16 max_latency;
41 u8 retrans_effort;
42 };
43
44 static 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
52 static 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
57 static 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 */
hci_connect_le_scan_cleanup(struct hci_conn * conn)63 static 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
hci_conn_cleanup(struct hci_conn * conn)114 static 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
le_scan_cleanup(struct work_struct * work)137 static 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
hci_connect_le_scan_remove(struct hci_conn * conn)166 static 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
hci_acl_create_connection(struct hci_conn * conn)188 static 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
hci_disconnect(struct hci_conn * conn,__u8 reason)231 int 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
hci_add_sco(struct hci_conn * conn,__u16 handle)253 static 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
hci_setup_sync(struct hci_conn * conn,__u16 handle)271 bool 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
hci_le_conn_update(struct hci_conn * conn,u16 min,u16 max,u16 latency,u16 to_multiplier)321 u8 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
hci_le_start_enc(struct hci_conn * conn,__le16 ediv,__le64 rand,__u8 ltk[16],__u8 key_size)357 void 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 */
hci_sco_setup(struct hci_conn * conn,__u8 status)376 void 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
hci_conn_timeout(struct work_struct * work)396 static 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 */
hci_conn_idle(struct work_struct * work)427 static 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
hci_conn_auto_accept(struct work_struct * work)461 static 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
le_conn_timeout(struct work_struct * work)470 static 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
hci_conn_add(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 role)494 struct 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
hci_conn_del(struct hci_conn * conn)569 int 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
hci_get_route(bdaddr_t * dst,bdaddr_t * src,uint8_t src_type)616 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
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_PRIMARY)
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 bdaddr_t id_addr;
638 u8 id_addr_type;
639
640 if (src_type == BDADDR_BREDR) {
641 if (!lmp_bredr_capable(d))
642 continue;
643 bacpy(&id_addr, &d->bdaddr);
644 id_addr_type = BDADDR_BREDR;
645 } else {
646 if (!lmp_le_capable(d))
647 continue;
648
649 hci_copy_identity_address(d, &id_addr,
650 &id_addr_type);
651
652 /* Convert from HCI to three-value type */
653 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
654 id_addr_type = BDADDR_LE_PUBLIC;
655 else
656 id_addr_type = BDADDR_LE_RANDOM;
657 }
658
659 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
660 hdev = d; break;
661 }
662 } else {
663 if (bacmp(&d->bdaddr, dst)) {
664 hdev = d; break;
665 }
666 }
667 }
668
669 if (hdev)
670 hdev = hci_dev_hold(hdev);
671
672 read_unlock(&hci_dev_list_lock);
673 return hdev;
674 }
675 EXPORT_SYMBOL(hci_get_route);
676
677 /* This function requires the caller holds hdev->lock */
hci_le_conn_failed(struct hci_conn * conn,u8 status)678 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
679 {
680 struct hci_dev *hdev = conn->hdev;
681 struct hci_conn_params *params;
682
683 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
684 conn->dst_type);
685 if (params && params->conn) {
686 hci_conn_drop(params->conn);
687 hci_conn_put(params->conn);
688 params->conn = NULL;
689 }
690
691 conn->state = BT_CLOSED;
692
693 /* If the status indicates successful cancellation of
694 * the attempt (i.e. Unkown Connection Id) there's no point of
695 * notifying failure since we'll go back to keep trying to
696 * connect. The only exception is explicit connect requests
697 * where a timeout + cancel does indicate an actual failure.
698 */
699 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
700 (params && params->explicit_connect))
701 mgmt_connect_failed(hdev, &conn->dst, conn->type,
702 conn->dst_type, status);
703
704 hci_connect_cfm(conn, status);
705
706 hci_conn_del(conn);
707
708 /* Since we may have temporarily stopped the background scanning in
709 * favor of connection establishment, we should restart it.
710 */
711 hci_update_background_scan(hdev);
712
713 /* Re-enable advertising in case this was a failed connection
714 * attempt as a peripheral.
715 */
716 hci_req_reenable_advertising(hdev);
717 }
718
create_le_conn_complete(struct hci_dev * hdev,u8 status,u16 opcode)719 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
720 {
721 struct hci_conn *conn;
722
723 hci_dev_lock(hdev);
724
725 conn = hci_lookup_le_connect(hdev);
726
727 if (!status) {
728 hci_connect_le_scan_cleanup(conn);
729 goto done;
730 }
731
732 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
733 status);
734
735 if (!conn)
736 goto done;
737
738 hci_le_conn_failed(conn, status);
739
740 done:
741 hci_dev_unlock(hdev);
742 }
743
conn_use_rpa(struct hci_conn * conn)744 static bool conn_use_rpa(struct hci_conn *conn)
745 {
746 struct hci_dev *hdev = conn->hdev;
747
748 return hci_dev_test_flag(hdev, HCI_PRIVACY);
749 }
750
hci_req_add_le_create_conn(struct hci_request * req,struct hci_conn * conn,bdaddr_t * direct_rpa)751 static void hci_req_add_le_create_conn(struct hci_request *req,
752 struct hci_conn *conn,
753 bdaddr_t *direct_rpa)
754 {
755 struct hci_cp_le_create_conn cp;
756 struct hci_dev *hdev = conn->hdev;
757 u8 own_addr_type;
758
759 /* If direct address was provided we use it instead of current
760 * address.
761 */
762 if (direct_rpa) {
763 if (bacmp(&req->hdev->random_addr, direct_rpa))
764 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
765 direct_rpa);
766
767 /* direct address is always RPA */
768 own_addr_type = ADDR_LE_DEV_RANDOM;
769 } else {
770 /* Update random address, but set require_privacy to false so
771 * that we never connect with an non-resolvable address.
772 */
773 if (hci_update_random_address(req, false, conn_use_rpa(conn),
774 &own_addr_type))
775 return;
776 }
777
778 memset(&cp, 0, sizeof(cp));
779
780 /* Set window to be the same value as the interval to enable
781 * continuous scanning.
782 */
783 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
784 cp.scan_window = cp.scan_interval;
785
786 bacpy(&cp.peer_addr, &conn->dst);
787 cp.peer_addr_type = conn->dst_type;
788 cp.own_address_type = own_addr_type;
789 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
790 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
791 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
792 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
793 cp.min_ce_len = cpu_to_le16(0x0000);
794 cp.max_ce_len = cpu_to_le16(0x0000);
795
796 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
797
798 conn->state = BT_CONNECT;
799 clear_bit(HCI_CONN_SCANNING, &conn->flags);
800 }
801
hci_req_directed_advertising(struct hci_request * req,struct hci_conn * conn)802 static void hci_req_directed_advertising(struct hci_request *req,
803 struct hci_conn *conn)
804 {
805 struct hci_dev *hdev = req->hdev;
806 struct hci_cp_le_set_adv_param cp;
807 u8 own_addr_type;
808 u8 enable;
809
810 /* Clear the HCI_LE_ADV bit temporarily so that the
811 * hci_update_random_address knows that it's safe to go ahead
812 * and write a new random address. The flag will be set back on
813 * as soon as the SET_ADV_ENABLE HCI command completes.
814 */
815 hci_dev_clear_flag(hdev, HCI_LE_ADV);
816
817 /* Set require_privacy to false so that the remote device has a
818 * chance of identifying us.
819 */
820 if (hci_update_random_address(req, false, conn_use_rpa(conn),
821 &own_addr_type) < 0)
822 return;
823
824 memset(&cp, 0, sizeof(cp));
825 cp.type = LE_ADV_DIRECT_IND;
826 cp.own_address_type = own_addr_type;
827 cp.direct_addr_type = conn->dst_type;
828 bacpy(&cp.direct_addr, &conn->dst);
829 cp.channel_map = hdev->le_adv_channel_map;
830
831 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
832
833 enable = 0x01;
834 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
835
836 conn->state = BT_CONNECT;
837 }
838
hci_connect_le(struct hci_dev * hdev,bdaddr_t * dst,u8 dst_type,u8 sec_level,u16 conn_timeout,u8 role,bdaddr_t * direct_rpa)839 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
840 u8 dst_type, u8 sec_level, u16 conn_timeout,
841 u8 role, bdaddr_t *direct_rpa)
842 {
843 struct hci_conn_params *params;
844 struct hci_conn *conn;
845 struct smp_irk *irk;
846 struct hci_request req;
847 int err;
848
849 /* Let's make sure that le is enabled.*/
850 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
851 if (lmp_le_capable(hdev))
852 return ERR_PTR(-ECONNREFUSED);
853
854 return ERR_PTR(-EOPNOTSUPP);
855 }
856
857 /* Since the controller supports only one LE connection attempt at a
858 * time, we return -EBUSY if there is any connection attempt running.
859 */
860 if (hci_lookup_le_connect(hdev))
861 return ERR_PTR(-EBUSY);
862
863 /* If there's already a connection object but it's not in
864 * scanning state it means it must already be established, in
865 * which case we can't do anything else except report a failure
866 * to connect.
867 */
868 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
869 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
870 return ERR_PTR(-EBUSY);
871 }
872
873 /* When given an identity address with existing identity
874 * resolving key, the connection needs to be established
875 * to a resolvable random address.
876 *
877 * Storing the resolvable random address is required here
878 * to handle connection failures. The address will later
879 * be resolved back into the original identity address
880 * from the connect request.
881 */
882 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
883 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
884 dst = &irk->rpa;
885 dst_type = ADDR_LE_DEV_RANDOM;
886 }
887
888 if (conn) {
889 bacpy(&conn->dst, dst);
890 } else {
891 conn = hci_conn_add(hdev, LE_LINK, dst, role);
892 if (!conn)
893 return ERR_PTR(-ENOMEM);
894 hci_conn_hold(conn);
895 conn->pending_sec_level = sec_level;
896 }
897
898 conn->dst_type = dst_type;
899 conn->sec_level = BT_SECURITY_LOW;
900 conn->conn_timeout = conn_timeout;
901
902 hci_req_init(&req, hdev);
903
904 /* Disable advertising if we're active. For master role
905 * connections most controllers will refuse to connect if
906 * advertising is enabled, and for slave role connections we
907 * anyway have to disable it in order to start directed
908 * advertising.
909 */
910 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
911 u8 enable = 0x00;
912 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
913 &enable);
914 }
915
916 /* If requested to connect as slave use directed advertising */
917 if (conn->role == HCI_ROLE_SLAVE) {
918 /* If we're active scanning most controllers are unable
919 * to initiate advertising. Simply reject the attempt.
920 */
921 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
922 hdev->le_scan_type == LE_SCAN_ACTIVE) {
923 skb_queue_purge(&req.cmd_q);
924 hci_conn_del(conn);
925 return ERR_PTR(-EBUSY);
926 }
927
928 hci_req_directed_advertising(&req, conn);
929 goto create_conn;
930 }
931
932 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
933 if (params) {
934 conn->le_conn_min_interval = params->conn_min_interval;
935 conn->le_conn_max_interval = params->conn_max_interval;
936 conn->le_conn_latency = params->conn_latency;
937 conn->le_supv_timeout = params->supervision_timeout;
938 } else {
939 conn->le_conn_min_interval = hdev->le_conn_min_interval;
940 conn->le_conn_max_interval = hdev->le_conn_max_interval;
941 conn->le_conn_latency = hdev->le_conn_latency;
942 conn->le_supv_timeout = hdev->le_supv_timeout;
943 }
944
945 /* If controller is scanning, we stop it since some controllers are
946 * not able to scan and connect at the same time. Also set the
947 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
948 * handler for scan disabling knows to set the correct discovery
949 * state.
950 */
951 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
952 hci_req_add_le_scan_disable(&req);
953 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
954 }
955
956 hci_req_add_le_create_conn(&req, conn, direct_rpa);
957
958 create_conn:
959 err = hci_req_run(&req, create_le_conn_complete);
960 if (err) {
961 hci_conn_del(conn);
962 return ERR_PTR(err);
963 }
964
965 return conn;
966 }
967
is_connected(struct hci_dev * hdev,bdaddr_t * addr,u8 type)968 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
969 {
970 struct hci_conn *conn;
971
972 conn = hci_conn_hash_lookup_le(hdev, addr, type);
973 if (!conn)
974 return false;
975
976 if (conn->state != BT_CONNECTED)
977 return false;
978
979 return true;
980 }
981
982 /* This function requires the caller holds hdev->lock */
hci_explicit_conn_params_set(struct hci_dev * hdev,bdaddr_t * addr,u8 addr_type)983 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
984 bdaddr_t *addr, u8 addr_type)
985 {
986 struct hci_conn_params *params;
987
988 if (is_connected(hdev, addr, addr_type))
989 return -EISCONN;
990
991 params = hci_conn_params_lookup(hdev, addr, addr_type);
992 if (!params) {
993 params = hci_conn_params_add(hdev, addr, addr_type);
994 if (!params)
995 return -ENOMEM;
996
997 /* If we created new params, mark them to be deleted in
998 * hci_connect_le_scan_cleanup. It's different case than
999 * existing disabled params, those will stay after cleanup.
1000 */
1001 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1002 }
1003
1004 /* We're trying to connect, so make sure params are at pend_le_conns */
1005 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1006 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1007 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1008 list_del_init(¶ms->action);
1009 list_add(¶ms->action, &hdev->pend_le_conns);
1010 }
1011
1012 params->explicit_connect = true;
1013
1014 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1015 params->auto_connect);
1016
1017 return 0;
1018 }
1019
1020 /* This function requires the caller holds hdev->lock */
hci_connect_le_scan(struct hci_dev * hdev,bdaddr_t * dst,u8 dst_type,u8 sec_level,u16 conn_timeout)1021 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1022 u8 dst_type, u8 sec_level,
1023 u16 conn_timeout)
1024 {
1025 struct hci_conn *conn;
1026
1027 /* Let's make sure that le is enabled.*/
1028 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1029 if (lmp_le_capable(hdev))
1030 return ERR_PTR(-ECONNREFUSED);
1031
1032 return ERR_PTR(-EOPNOTSUPP);
1033 }
1034
1035 /* Some devices send ATT messages as soon as the physical link is
1036 * established. To be able to handle these ATT messages, the user-
1037 * space first establishes the connection and then starts the pairing
1038 * process.
1039 *
1040 * So if a hci_conn object already exists for the following connection
1041 * attempt, we simply update pending_sec_level and auth_type fields
1042 * and return the object found.
1043 */
1044 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1045 if (conn) {
1046 if (conn->pending_sec_level < sec_level)
1047 conn->pending_sec_level = sec_level;
1048 goto done;
1049 }
1050
1051 BT_DBG("requesting refresh of dst_addr");
1052
1053 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1054 if (!conn)
1055 return ERR_PTR(-ENOMEM);
1056
1057 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1058 hci_conn_del(conn);
1059 return ERR_PTR(-EBUSY);
1060 }
1061
1062 conn->state = BT_CONNECT;
1063 set_bit(HCI_CONN_SCANNING, &conn->flags);
1064 conn->dst_type = dst_type;
1065 conn->sec_level = BT_SECURITY_LOW;
1066 conn->pending_sec_level = sec_level;
1067 conn->conn_timeout = conn_timeout;
1068
1069 hci_update_background_scan(hdev);
1070
1071 done:
1072 hci_conn_hold(conn);
1073 return conn;
1074 }
1075
hci_connect_acl(struct hci_dev * hdev,bdaddr_t * dst,u8 sec_level,u8 auth_type)1076 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1077 u8 sec_level, u8 auth_type)
1078 {
1079 struct hci_conn *acl;
1080
1081 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1082 if (lmp_bredr_capable(hdev))
1083 return ERR_PTR(-ECONNREFUSED);
1084
1085 return ERR_PTR(-EOPNOTSUPP);
1086 }
1087
1088 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1089 if (!acl) {
1090 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1091 if (!acl)
1092 return ERR_PTR(-ENOMEM);
1093 }
1094
1095 hci_conn_hold(acl);
1096
1097 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1098 acl->sec_level = BT_SECURITY_LOW;
1099 acl->pending_sec_level = sec_level;
1100 acl->auth_type = auth_type;
1101 hci_acl_create_connection(acl);
1102 }
1103
1104 return acl;
1105 }
1106
hci_connect_sco(struct hci_dev * hdev,int type,bdaddr_t * dst,__u16 setting)1107 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1108 __u16 setting)
1109 {
1110 struct hci_conn *acl;
1111 struct hci_conn *sco;
1112
1113 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1114 if (IS_ERR(acl))
1115 return acl;
1116
1117 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1118 if (!sco) {
1119 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1120 if (!sco) {
1121 hci_conn_drop(acl);
1122 return ERR_PTR(-ENOMEM);
1123 }
1124 }
1125
1126 acl->link = sco;
1127 sco->link = acl;
1128
1129 hci_conn_hold(sco);
1130
1131 sco->setting = setting;
1132
1133 if (acl->state == BT_CONNECTED &&
1134 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1135 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1136 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1137
1138 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1139 /* defer SCO setup until mode change completed */
1140 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1141 return sco;
1142 }
1143
1144 hci_sco_setup(acl, 0x00);
1145 }
1146
1147 return sco;
1148 }
1149
1150 /* Check link security requirement */
hci_conn_check_link_mode(struct hci_conn * conn)1151 int hci_conn_check_link_mode(struct hci_conn *conn)
1152 {
1153 BT_DBG("hcon %p", conn);
1154
1155 /* In Secure Connections Only mode, it is required that Secure
1156 * Connections is used and the link is encrypted with AES-CCM
1157 * using a P-256 authenticated combination key.
1158 */
1159 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1160 if (!hci_conn_sc_enabled(conn) ||
1161 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1162 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1163 return 0;
1164 }
1165
1166 if (hci_conn_ssp_enabled(conn) &&
1167 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1168 return 0;
1169
1170 return 1;
1171 }
1172
1173 /* Authenticate remote device */
hci_conn_auth(struct hci_conn * conn,__u8 sec_level,__u8 auth_type)1174 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1175 {
1176 BT_DBG("hcon %p", conn);
1177
1178 if (conn->pending_sec_level > sec_level)
1179 sec_level = conn->pending_sec_level;
1180
1181 if (sec_level > conn->sec_level)
1182 conn->pending_sec_level = sec_level;
1183 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1184 return 1;
1185
1186 /* Make sure we preserve an existing MITM requirement*/
1187 auth_type |= (conn->auth_type & 0x01);
1188
1189 conn->auth_type = auth_type;
1190
1191 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1192 struct hci_cp_auth_requested cp;
1193
1194 cp.handle = cpu_to_le16(conn->handle);
1195 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1196 sizeof(cp), &cp);
1197
1198 /* If we're already encrypted set the REAUTH_PEND flag,
1199 * otherwise set the ENCRYPT_PEND.
1200 */
1201 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1202 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1203 else
1204 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1205 }
1206
1207 return 0;
1208 }
1209
1210 /* Encrypt the the link */
hci_conn_encrypt(struct hci_conn * conn)1211 static void hci_conn_encrypt(struct hci_conn *conn)
1212 {
1213 BT_DBG("hcon %p", conn);
1214
1215 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1216 struct hci_cp_set_conn_encrypt cp;
1217 cp.handle = cpu_to_le16(conn->handle);
1218 cp.encrypt = 0x01;
1219 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1220 &cp);
1221 }
1222 }
1223
1224 /* Enable security */
hci_conn_security(struct hci_conn * conn,__u8 sec_level,__u8 auth_type,bool initiator)1225 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1226 bool initiator)
1227 {
1228 BT_DBG("hcon %p", conn);
1229
1230 if (conn->type == LE_LINK)
1231 return smp_conn_security(conn, sec_level);
1232
1233 /* For sdp we don't need the link key. */
1234 if (sec_level == BT_SECURITY_SDP)
1235 return 1;
1236
1237 /* For non 2.1 devices and low security level we don't need the link
1238 key. */
1239 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1240 return 1;
1241
1242 /* For other security levels we need the link key. */
1243 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1244 goto auth;
1245
1246 /* An authenticated FIPS approved combination key has sufficient
1247 * security for security level 4. */
1248 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1249 sec_level == BT_SECURITY_FIPS)
1250 goto encrypt;
1251
1252 /* An authenticated combination key has sufficient security for
1253 security level 3. */
1254 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1255 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1256 sec_level == BT_SECURITY_HIGH)
1257 goto encrypt;
1258
1259 /* An unauthenticated combination key has sufficient security for
1260 security level 1 and 2. */
1261 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1262 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1263 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1264 goto encrypt;
1265
1266 /* A combination key has always sufficient security for the security
1267 levels 1 or 2. High security level requires the combination key
1268 is generated using maximum PIN code length (16).
1269 For pre 2.1 units. */
1270 if (conn->key_type == HCI_LK_COMBINATION &&
1271 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1272 conn->pin_length == 16))
1273 goto encrypt;
1274
1275 auth:
1276 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1277 return 0;
1278
1279 if (initiator)
1280 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1281
1282 if (!hci_conn_auth(conn, sec_level, auth_type))
1283 return 0;
1284
1285 encrypt:
1286 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1287 /* Ensure that the encryption key size has been read,
1288 * otherwise stall the upper layer responses.
1289 */
1290 if (!conn->enc_key_size)
1291 return 0;
1292
1293 /* Nothing else needed, all requirements are met */
1294 return 1;
1295 }
1296
1297 hci_conn_encrypt(conn);
1298 return 0;
1299 }
1300 EXPORT_SYMBOL(hci_conn_security);
1301
1302 /* Check secure link requirement */
hci_conn_check_secure(struct hci_conn * conn,__u8 sec_level)1303 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1304 {
1305 BT_DBG("hcon %p", conn);
1306
1307 /* Accept if non-secure or higher security level is required */
1308 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1309 return 1;
1310
1311 /* Accept if secure or higher security level is already present */
1312 if (conn->sec_level == BT_SECURITY_HIGH ||
1313 conn->sec_level == BT_SECURITY_FIPS)
1314 return 1;
1315
1316 /* Reject not secure link */
1317 return 0;
1318 }
1319 EXPORT_SYMBOL(hci_conn_check_secure);
1320
1321 /* Switch role */
hci_conn_switch_role(struct hci_conn * conn,__u8 role)1322 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1323 {
1324 BT_DBG("hcon %p", conn);
1325
1326 if (role == conn->role)
1327 return 1;
1328
1329 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1330 struct hci_cp_switch_role cp;
1331 bacpy(&cp.bdaddr, &conn->dst);
1332 cp.role = role;
1333 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1334 }
1335
1336 return 0;
1337 }
1338 EXPORT_SYMBOL(hci_conn_switch_role);
1339
1340 /* Enter active mode */
hci_conn_enter_active_mode(struct hci_conn * conn,__u8 force_active)1341 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1342 {
1343 struct hci_dev *hdev = conn->hdev;
1344
1345 BT_DBG("hcon %p mode %d", conn, conn->mode);
1346
1347 if (conn->mode != HCI_CM_SNIFF)
1348 goto timer;
1349
1350 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1351 goto timer;
1352
1353 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1354 struct hci_cp_exit_sniff_mode cp;
1355 cp.handle = cpu_to_le16(conn->handle);
1356 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1357 }
1358
1359 timer:
1360 if (hdev->idle_timeout > 0)
1361 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1362 msecs_to_jiffies(hdev->idle_timeout));
1363 }
1364
1365 /* Drop all connection on the device */
hci_conn_hash_flush(struct hci_dev * hdev)1366 void hci_conn_hash_flush(struct hci_dev *hdev)
1367 {
1368 struct hci_conn_hash *h = &hdev->conn_hash;
1369 struct hci_conn *c, *n;
1370
1371 BT_DBG("hdev %s", hdev->name);
1372
1373 list_for_each_entry_safe(c, n, &h->list, list) {
1374 c->state = BT_CLOSED;
1375
1376 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1377 hci_conn_del(c);
1378 }
1379 }
1380
1381 /* Check pending connect attempts */
hci_conn_check_pending(struct hci_dev * hdev)1382 void hci_conn_check_pending(struct hci_dev *hdev)
1383 {
1384 struct hci_conn *conn;
1385
1386 BT_DBG("hdev %s", hdev->name);
1387
1388 hci_dev_lock(hdev);
1389
1390 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1391 if (conn)
1392 hci_acl_create_connection(conn);
1393
1394 hci_dev_unlock(hdev);
1395 }
1396
get_link_mode(struct hci_conn * conn)1397 static u32 get_link_mode(struct hci_conn *conn)
1398 {
1399 u32 link_mode = 0;
1400
1401 if (conn->role == HCI_ROLE_MASTER)
1402 link_mode |= HCI_LM_MASTER;
1403
1404 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1405 link_mode |= HCI_LM_ENCRYPT;
1406
1407 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1408 link_mode |= HCI_LM_AUTH;
1409
1410 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1411 link_mode |= HCI_LM_SECURE;
1412
1413 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1414 link_mode |= HCI_LM_FIPS;
1415
1416 return link_mode;
1417 }
1418
hci_get_conn_list(void __user * arg)1419 int hci_get_conn_list(void __user *arg)
1420 {
1421 struct hci_conn *c;
1422 struct hci_conn_list_req req, *cl;
1423 struct hci_conn_info *ci;
1424 struct hci_dev *hdev;
1425 int n = 0, size, err;
1426
1427 if (copy_from_user(&req, arg, sizeof(req)))
1428 return -EFAULT;
1429
1430 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1431 return -EINVAL;
1432
1433 size = sizeof(req) + req.conn_num * sizeof(*ci);
1434
1435 cl = kmalloc(size, GFP_KERNEL);
1436 if (!cl)
1437 return -ENOMEM;
1438
1439 hdev = hci_dev_get(req.dev_id);
1440 if (!hdev) {
1441 kfree(cl);
1442 return -ENODEV;
1443 }
1444
1445 ci = cl->conn_info;
1446
1447 hci_dev_lock(hdev);
1448 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1449 bacpy(&(ci + n)->bdaddr, &c->dst);
1450 (ci + n)->handle = c->handle;
1451 (ci + n)->type = c->type;
1452 (ci + n)->out = c->out;
1453 (ci + n)->state = c->state;
1454 (ci + n)->link_mode = get_link_mode(c);
1455 if (++n >= req.conn_num)
1456 break;
1457 }
1458 hci_dev_unlock(hdev);
1459
1460 cl->dev_id = hdev->id;
1461 cl->conn_num = n;
1462 size = sizeof(req) + n * sizeof(*ci);
1463
1464 hci_dev_put(hdev);
1465
1466 err = copy_to_user(arg, cl, size);
1467 kfree(cl);
1468
1469 return err ? -EFAULT : 0;
1470 }
1471
hci_get_conn_info(struct hci_dev * hdev,void __user * arg)1472 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1473 {
1474 struct hci_conn_info_req req;
1475 struct hci_conn_info ci;
1476 struct hci_conn *conn;
1477 char __user *ptr = arg + sizeof(req);
1478
1479 if (copy_from_user(&req, arg, sizeof(req)))
1480 return -EFAULT;
1481
1482 hci_dev_lock(hdev);
1483 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1484 if (conn) {
1485 bacpy(&ci.bdaddr, &conn->dst);
1486 ci.handle = conn->handle;
1487 ci.type = conn->type;
1488 ci.out = conn->out;
1489 ci.state = conn->state;
1490 ci.link_mode = get_link_mode(conn);
1491 }
1492 hci_dev_unlock(hdev);
1493
1494 if (!conn)
1495 return -ENOENT;
1496
1497 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1498 }
1499
hci_get_auth_info(struct hci_dev * hdev,void __user * arg)1500 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1501 {
1502 struct hci_auth_info_req req;
1503 struct hci_conn *conn;
1504
1505 if (copy_from_user(&req, arg, sizeof(req)))
1506 return -EFAULT;
1507
1508 hci_dev_lock(hdev);
1509 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1510 if (conn)
1511 req.type = conn->auth_type;
1512 hci_dev_unlock(hdev);
1513
1514 if (!conn)
1515 return -ENOENT;
1516
1517 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1518 }
1519
hci_chan_create(struct hci_conn * conn)1520 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1521 {
1522 struct hci_dev *hdev = conn->hdev;
1523 struct hci_chan *chan;
1524
1525 BT_DBG("%s hcon %p", hdev->name, conn);
1526
1527 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1528 BT_DBG("Refusing to create new hci_chan");
1529 return NULL;
1530 }
1531
1532 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1533 if (!chan)
1534 return NULL;
1535
1536 chan->conn = hci_conn_get(conn);
1537 skb_queue_head_init(&chan->data_q);
1538 chan->state = BT_CONNECTED;
1539
1540 list_add_rcu(&chan->list, &conn->chan_list);
1541
1542 return chan;
1543 }
1544
hci_chan_del(struct hci_chan * chan)1545 void hci_chan_del(struct hci_chan *chan)
1546 {
1547 struct hci_conn *conn = chan->conn;
1548 struct hci_dev *hdev = conn->hdev;
1549
1550 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1551
1552 list_del_rcu(&chan->list);
1553
1554 synchronize_rcu();
1555
1556 /* Prevent new hci_chan's to be created for this hci_conn */
1557 set_bit(HCI_CONN_DROP, &conn->flags);
1558
1559 hci_conn_put(conn);
1560
1561 skb_queue_purge(&chan->data_q);
1562 kfree(chan);
1563 }
1564
hci_chan_list_flush(struct hci_conn * conn)1565 void hci_chan_list_flush(struct hci_conn *conn)
1566 {
1567 struct hci_chan *chan, *n;
1568
1569 BT_DBG("hcon %p", conn);
1570
1571 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1572 hci_chan_del(chan);
1573 }
1574
__hci_chan_lookup_handle(struct hci_conn * hcon,__u16 handle)1575 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1576 __u16 handle)
1577 {
1578 struct hci_chan *hchan;
1579
1580 list_for_each_entry(hchan, &hcon->chan_list, list) {
1581 if (hchan->handle == handle)
1582 return hchan;
1583 }
1584
1585 return NULL;
1586 }
1587
hci_chan_lookup_handle(struct hci_dev * hdev,__u16 handle)1588 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1589 {
1590 struct hci_conn_hash *h = &hdev->conn_hash;
1591 struct hci_conn *hcon;
1592 struct hci_chan *hchan = NULL;
1593
1594 rcu_read_lock();
1595
1596 list_for_each_entry_rcu(hcon, &h->list, list) {
1597 hchan = __hci_chan_lookup_handle(hcon, handle);
1598 if (hchan)
1599 break;
1600 }
1601
1602 rcu_read_unlock();
1603
1604 return hchan;
1605 }
1606