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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 Copyright 2023 NXP
5
6 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License version 2 as
10 published by the Free Software Foundation;
11
12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
13 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
15 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
16 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
17 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20
21 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
22 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
23 SOFTWARE IS DISCLAIMED.
24*/
25
26/* Bluetooth HCI connection handling. */
27
28#include <linux/export.h>
29#include <linux/debugfs.h>
30
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33#include <net/bluetooth/l2cap.h>
34#include <net/bluetooth/iso.h>
35#include <net/bluetooth/mgmt.h>
36
37#include "hci_request.h"
38#include "smp.h"
39#include "a2mp.h"
40#include "eir.h"
41
42struct sco_param {
43 u16 pkt_type;
44 u16 max_latency;
45 u8 retrans_effort;
46};
47
48struct conn_handle_t {
49 struct hci_conn *conn;
50 __u16 handle;
51};
52
53static const struct sco_param esco_param_cvsd[] = {
54 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
55 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
56 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
57 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
58 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
59};
60
61static const struct sco_param sco_param_cvsd[] = {
62 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
63 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
64};
65
66static const struct sco_param esco_param_msbc[] = {
67 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
68 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
69};
70
71/* This function requires the caller holds hdev->lock */
72static void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
73{
74 struct hci_conn_params *params;
75 struct hci_dev *hdev = conn->hdev;
76 struct smp_irk *irk;
77 bdaddr_t *bdaddr;
78 u8 bdaddr_type;
79
80 bdaddr = &conn->dst;
81 bdaddr_type = conn->dst_type;
82
83 /* Check if we need to convert to identity address */
84 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
85 if (irk) {
86 bdaddr = &irk->bdaddr;
87 bdaddr_type = irk->addr_type;
88 }
89
90 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
91 bdaddr_type);
92 if (!params)
93 return;
94
95 if (params->conn) {
96 hci_conn_drop(params->conn);
97 hci_conn_put(params->conn);
98 params->conn = NULL;
99 }
100
101 if (!params->explicit_connect)
102 return;
103
104 /* If the status indicates successful cancellation of
105 * the attempt (i.e. Unknown Connection Id) there's no point of
106 * notifying failure since we'll go back to keep trying to
107 * connect. The only exception is explicit connect requests
108 * where a timeout + cancel does indicate an actual failure.
109 */
110 if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
111 mgmt_connect_failed(hdev, &conn->dst, conn->type,
112 conn->dst_type, status);
113
114 /* The connection attempt was doing scan for new RPA, and is
115 * in scan phase. If params are not associated with any other
116 * autoconnect action, remove them completely. If they are, just unmark
117 * them as waiting for connection, by clearing explicit_connect field.
118 */
119 params->explicit_connect = false;
120
121 hci_pend_le_list_del_init(params);
122
123 switch (params->auto_connect) {
124 case HCI_AUTO_CONN_EXPLICIT:
125 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
126 /* return instead of break to avoid duplicate scan update */
127 return;
128 case HCI_AUTO_CONN_DIRECT:
129 case HCI_AUTO_CONN_ALWAYS:
130 hci_pend_le_list_add(params, &hdev->pend_le_conns);
131 break;
132 case HCI_AUTO_CONN_REPORT:
133 hci_pend_le_list_add(params, &hdev->pend_le_reports);
134 break;
135 default:
136 break;
137 }
138
139 hci_update_passive_scan(hdev);
140}
141
142static void hci_conn_cleanup(struct hci_conn *conn)
143{
144 struct hci_dev *hdev = conn->hdev;
145
146 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
147 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
148
149 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
150 hci_remove_link_key(hdev, &conn->dst);
151
152 hci_chan_list_flush(conn);
153
154 hci_conn_hash_del(hdev, conn);
155
156 if (HCI_CONN_HANDLE_UNSET(conn->handle))
157 ida_free(&hdev->unset_handle_ida, conn->handle);
158
159 if (conn->cleanup)
160 conn->cleanup(conn);
161
162 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
163 switch (conn->setting & SCO_AIRMODE_MASK) {
164 case SCO_AIRMODE_CVSD:
165 case SCO_AIRMODE_TRANSP:
166 if (hdev->notify)
167 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
168 break;
169 }
170 } else {
171 if (hdev->notify)
172 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
173 }
174
175 debugfs_remove_recursive(conn->debugfs);
176
177 hci_conn_del_sysfs(conn);
178
179 hci_dev_put(hdev);
180}
181
182static void hci_acl_create_connection(struct hci_conn *conn)
183{
184 struct hci_dev *hdev = conn->hdev;
185 struct inquiry_entry *ie;
186 struct hci_cp_create_conn cp;
187
188 BT_DBG("hcon %p", conn);
189
190 /* Many controllers disallow HCI Create Connection while it is doing
191 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
192 * Connection. This may cause the MGMT discovering state to become false
193 * without user space's request but it is okay since the MGMT Discovery
194 * APIs do not promise that discovery should be done forever. Instead,
195 * the user space monitors the status of MGMT discovering and it may
196 * request for discovery again when this flag becomes false.
197 */
198 if (test_bit(HCI_INQUIRY, &hdev->flags)) {
199 /* Put this connection to "pending" state so that it will be
200 * executed after the inquiry cancel command complete event.
201 */
202 conn->state = BT_CONNECT2;
203 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
204 return;
205 }
206
207 conn->state = BT_CONNECT;
208 conn->out = true;
209 conn->role = HCI_ROLE_MASTER;
210
211 conn->attempt++;
212
213 conn->link_policy = hdev->link_policy;
214
215 memset(&cp, 0, sizeof(cp));
216 bacpy(&cp.bdaddr, &conn->dst);
217 cp.pscan_rep_mode = 0x02;
218
219 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
220 if (ie) {
221 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
222 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
223 cp.pscan_mode = ie->data.pscan_mode;
224 cp.clock_offset = ie->data.clock_offset |
225 cpu_to_le16(0x8000);
226 }
227
228 memcpy(conn->dev_class, ie->data.dev_class, 3);
229 }
230
231 cp.pkt_type = cpu_to_le16(conn->pkt_type);
232 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
233 cp.role_switch = 0x01;
234 else
235 cp.role_switch = 0x00;
236
237 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
238}
239
240int hci_disconnect(struct hci_conn *conn, __u8 reason)
241{
242 BT_DBG("hcon %p", conn);
243
244 /* When we are central of an established connection and it enters
245 * the disconnect timeout, then go ahead and try to read the
246 * current clock offset. Processing of the result is done
247 * within the event handling and hci_clock_offset_evt function.
248 */
249 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
250 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
251 struct hci_dev *hdev = conn->hdev;
252 struct hci_cp_read_clock_offset clkoff_cp;
253
254 clkoff_cp.handle = cpu_to_le16(conn->handle);
255 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
256 &clkoff_cp);
257 }
258
259 return hci_abort_conn(conn, reason);
260}
261
262static void hci_add_sco(struct hci_conn *conn, __u16 handle)
263{
264 struct hci_dev *hdev = conn->hdev;
265 struct hci_cp_add_sco cp;
266
267 BT_DBG("hcon %p", conn);
268
269 conn->state = BT_CONNECT;
270 conn->out = true;
271
272 conn->attempt++;
273
274 cp.handle = cpu_to_le16(handle);
275 cp.pkt_type = cpu_to_le16(conn->pkt_type);
276
277 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
278}
279
280static bool find_next_esco_param(struct hci_conn *conn,
281 const struct sco_param *esco_param, int size)
282{
283 if (!conn->parent)
284 return false;
285
286 for (; conn->attempt <= size; conn->attempt++) {
287 if (lmp_esco_2m_capable(conn->parent) ||
288 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
289 break;
290 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
291 conn, conn->attempt);
292 }
293
294 return conn->attempt <= size;
295}
296
297static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
298{
299 int err;
300 __u8 vnd_len, *vnd_data = NULL;
301 struct hci_op_configure_data_path *cmd = NULL;
302
303 if (!codec->data_path || !hdev->get_codec_config_data)
304 return 0;
305
306 /* Do not take me as error */
307 if (!hdev->get_codec_config_data)
308 return 0;
309
310 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
311 &vnd_data);
312 if (err < 0)
313 goto error;
314
315 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
316 if (!cmd) {
317 err = -ENOMEM;
318 goto error;
319 }
320
321 err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
322 if (err < 0)
323 goto error;
324
325 cmd->vnd_len = vnd_len;
326 memcpy(cmd->vnd_data, vnd_data, vnd_len);
327
328 cmd->direction = 0x00;
329 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
330 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
331
332 cmd->direction = 0x01;
333 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
334 sizeof(*cmd) + vnd_len, cmd,
335 HCI_CMD_TIMEOUT);
336error:
337
338 kfree(cmd);
339 kfree(vnd_data);
340 return err;
341}
342
343static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
344{
345 struct conn_handle_t *conn_handle = data;
346 struct hci_conn *conn = conn_handle->conn;
347 __u16 handle = conn_handle->handle;
348 struct hci_cp_enhanced_setup_sync_conn cp;
349 const struct sco_param *param;
350
351 kfree(conn_handle);
352
353 bt_dev_dbg(hdev, "hcon %p", conn);
354
355 configure_datapath_sync(hdev, &conn->codec);
356
357 conn->state = BT_CONNECT;
358 conn->out = true;
359
360 conn->attempt++;
361
362 memset(&cp, 0x00, sizeof(cp));
363
364 cp.handle = cpu_to_le16(handle);
365
366 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
367 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
368
369 switch (conn->codec.id) {
370 case BT_CODEC_MSBC:
371 if (!find_next_esco_param(conn, esco_param_msbc,
372 ARRAY_SIZE(esco_param_msbc)))
373 return -EINVAL;
374
375 param = &esco_param_msbc[conn->attempt - 1];
376 cp.tx_coding_format.id = 0x05;
377 cp.rx_coding_format.id = 0x05;
378 cp.tx_codec_frame_size = __cpu_to_le16(60);
379 cp.rx_codec_frame_size = __cpu_to_le16(60);
380 cp.in_bandwidth = __cpu_to_le32(32000);
381 cp.out_bandwidth = __cpu_to_le32(32000);
382 cp.in_coding_format.id = 0x04;
383 cp.out_coding_format.id = 0x04;
384 cp.in_coded_data_size = __cpu_to_le16(16);
385 cp.out_coded_data_size = __cpu_to_le16(16);
386 cp.in_pcm_data_format = 2;
387 cp.out_pcm_data_format = 2;
388 cp.in_pcm_sample_payload_msb_pos = 0;
389 cp.out_pcm_sample_payload_msb_pos = 0;
390 cp.in_data_path = conn->codec.data_path;
391 cp.out_data_path = conn->codec.data_path;
392 cp.in_transport_unit_size = 1;
393 cp.out_transport_unit_size = 1;
394 break;
395
396 case BT_CODEC_TRANSPARENT:
397 if (!find_next_esco_param(conn, esco_param_msbc,
398 ARRAY_SIZE(esco_param_msbc)))
399 return false;
400 param = &esco_param_msbc[conn->attempt - 1];
401 cp.tx_coding_format.id = 0x03;
402 cp.rx_coding_format.id = 0x03;
403 cp.tx_codec_frame_size = __cpu_to_le16(60);
404 cp.rx_codec_frame_size = __cpu_to_le16(60);
405 cp.in_bandwidth = __cpu_to_le32(0x1f40);
406 cp.out_bandwidth = __cpu_to_le32(0x1f40);
407 cp.in_coding_format.id = 0x03;
408 cp.out_coding_format.id = 0x03;
409 cp.in_coded_data_size = __cpu_to_le16(16);
410 cp.out_coded_data_size = __cpu_to_le16(16);
411 cp.in_pcm_data_format = 2;
412 cp.out_pcm_data_format = 2;
413 cp.in_pcm_sample_payload_msb_pos = 0;
414 cp.out_pcm_sample_payload_msb_pos = 0;
415 cp.in_data_path = conn->codec.data_path;
416 cp.out_data_path = conn->codec.data_path;
417 cp.in_transport_unit_size = 1;
418 cp.out_transport_unit_size = 1;
419 break;
420
421 case BT_CODEC_CVSD:
422 if (conn->parent && lmp_esco_capable(conn->parent)) {
423 if (!find_next_esco_param(conn, esco_param_cvsd,
424 ARRAY_SIZE(esco_param_cvsd)))
425 return -EINVAL;
426 param = &esco_param_cvsd[conn->attempt - 1];
427 } else {
428 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
429 return -EINVAL;
430 param = &sco_param_cvsd[conn->attempt - 1];
431 }
432 cp.tx_coding_format.id = 2;
433 cp.rx_coding_format.id = 2;
434 cp.tx_codec_frame_size = __cpu_to_le16(60);
435 cp.rx_codec_frame_size = __cpu_to_le16(60);
436 cp.in_bandwidth = __cpu_to_le32(16000);
437 cp.out_bandwidth = __cpu_to_le32(16000);
438 cp.in_coding_format.id = 4;
439 cp.out_coding_format.id = 4;
440 cp.in_coded_data_size = __cpu_to_le16(16);
441 cp.out_coded_data_size = __cpu_to_le16(16);
442 cp.in_pcm_data_format = 2;
443 cp.out_pcm_data_format = 2;
444 cp.in_pcm_sample_payload_msb_pos = 0;
445 cp.out_pcm_sample_payload_msb_pos = 0;
446 cp.in_data_path = conn->codec.data_path;
447 cp.out_data_path = conn->codec.data_path;
448 cp.in_transport_unit_size = 16;
449 cp.out_transport_unit_size = 16;
450 break;
451 default:
452 return -EINVAL;
453 }
454
455 cp.retrans_effort = param->retrans_effort;
456 cp.pkt_type = __cpu_to_le16(param->pkt_type);
457 cp.max_latency = __cpu_to_le16(param->max_latency);
458
459 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
460 return -EIO;
461
462 return 0;
463}
464
465static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
466{
467 struct hci_dev *hdev = conn->hdev;
468 struct hci_cp_setup_sync_conn cp;
469 const struct sco_param *param;
470
471 bt_dev_dbg(hdev, "hcon %p", conn);
472
473 conn->state = BT_CONNECT;
474 conn->out = true;
475
476 conn->attempt++;
477
478 cp.handle = cpu_to_le16(handle);
479
480 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
481 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
482 cp.voice_setting = cpu_to_le16(conn->setting);
483
484 switch (conn->setting & SCO_AIRMODE_MASK) {
485 case SCO_AIRMODE_TRANSP:
486 if (!find_next_esco_param(conn, esco_param_msbc,
487 ARRAY_SIZE(esco_param_msbc)))
488 return false;
489 param = &esco_param_msbc[conn->attempt - 1];
490 break;
491 case SCO_AIRMODE_CVSD:
492 if (conn->parent && lmp_esco_capable(conn->parent)) {
493 if (!find_next_esco_param(conn, esco_param_cvsd,
494 ARRAY_SIZE(esco_param_cvsd)))
495 return false;
496 param = &esco_param_cvsd[conn->attempt - 1];
497 } else {
498 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
499 return false;
500 param = &sco_param_cvsd[conn->attempt - 1];
501 }
502 break;
503 default:
504 return false;
505 }
506
507 cp.retrans_effort = param->retrans_effort;
508 cp.pkt_type = __cpu_to_le16(param->pkt_type);
509 cp.max_latency = __cpu_to_le16(param->max_latency);
510
511 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
512 return false;
513
514 return true;
515}
516
517bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
518{
519 int result;
520 struct conn_handle_t *conn_handle;
521
522 if (enhanced_sync_conn_capable(conn->hdev)) {
523 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
524
525 if (!conn_handle)
526 return false;
527
528 conn_handle->conn = conn;
529 conn_handle->handle = handle;
530 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
531 conn_handle, NULL);
532 if (result < 0)
533 kfree(conn_handle);
534
535 return result == 0;
536 }
537
538 return hci_setup_sync_conn(conn, handle);
539}
540
541u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
542 u16 to_multiplier)
543{
544 struct hci_dev *hdev = conn->hdev;
545 struct hci_conn_params *params;
546 struct hci_cp_le_conn_update cp;
547
548 hci_dev_lock(hdev);
549
550 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
551 if (params) {
552 params->conn_min_interval = min;
553 params->conn_max_interval = max;
554 params->conn_latency = latency;
555 params->supervision_timeout = to_multiplier;
556 }
557
558 hci_dev_unlock(hdev);
559
560 memset(&cp, 0, sizeof(cp));
561 cp.handle = cpu_to_le16(conn->handle);
562 cp.conn_interval_min = cpu_to_le16(min);
563 cp.conn_interval_max = cpu_to_le16(max);
564 cp.conn_latency = cpu_to_le16(latency);
565 cp.supervision_timeout = cpu_to_le16(to_multiplier);
566 cp.min_ce_len = cpu_to_le16(0x0000);
567 cp.max_ce_len = cpu_to_le16(0x0000);
568
569 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
570
571 if (params)
572 return 0x01;
573
574 return 0x00;
575}
576
577void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
578 __u8 ltk[16], __u8 key_size)
579{
580 struct hci_dev *hdev = conn->hdev;
581 struct hci_cp_le_start_enc cp;
582
583 BT_DBG("hcon %p", conn);
584
585 memset(&cp, 0, sizeof(cp));
586
587 cp.handle = cpu_to_le16(conn->handle);
588 cp.rand = rand;
589 cp.ediv = ediv;
590 memcpy(cp.ltk, ltk, key_size);
591
592 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
593}
594
595/* Device _must_ be locked */
596void hci_sco_setup(struct hci_conn *conn, __u8 status)
597{
598 struct hci_link *link;
599
600 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
601 if (!link || !link->conn)
602 return;
603
604 BT_DBG("hcon %p", conn);
605
606 if (!status) {
607 if (lmp_esco_capable(conn->hdev))
608 hci_setup_sync(link->conn, conn->handle);
609 else
610 hci_add_sco(link->conn, conn->handle);
611 } else {
612 hci_connect_cfm(link->conn, status);
613 hci_conn_del(link->conn);
614 }
615}
616
617static void hci_conn_timeout(struct work_struct *work)
618{
619 struct hci_conn *conn = container_of(work, struct hci_conn,
620 disc_work.work);
621 int refcnt = atomic_read(&conn->refcnt);
622
623 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
624
625 WARN_ON(refcnt < 0);
626
627 /* FIXME: It was observed that in pairing failed scenario, refcnt
628 * drops below 0. Probably this is because l2cap_conn_del calls
629 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
630 * dropped. After that loop hci_chan_del is called which also drops
631 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
632 * otherwise drop it.
633 */
634 if (refcnt > 0)
635 return;
636
637 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
638}
639
640/* Enter sniff mode */
641static void hci_conn_idle(struct work_struct *work)
642{
643 struct hci_conn *conn = container_of(work, struct hci_conn,
644 idle_work.work);
645 struct hci_dev *hdev = conn->hdev;
646
647 BT_DBG("hcon %p mode %d", conn, conn->mode);
648
649 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
650 return;
651
652 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
653 return;
654
655 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
656 struct hci_cp_sniff_subrate cp;
657 cp.handle = cpu_to_le16(conn->handle);
658 cp.max_latency = cpu_to_le16(0);
659 cp.min_remote_timeout = cpu_to_le16(0);
660 cp.min_local_timeout = cpu_to_le16(0);
661 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
662 }
663
664 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
665 struct hci_cp_sniff_mode cp;
666 cp.handle = cpu_to_le16(conn->handle);
667 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
668 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
669 cp.attempt = cpu_to_le16(4);
670 cp.timeout = cpu_to_le16(1);
671 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
672 }
673}
674
675static void hci_conn_auto_accept(struct work_struct *work)
676{
677 struct hci_conn *conn = container_of(work, struct hci_conn,
678 auto_accept_work.work);
679
680 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
681 &conn->dst);
682}
683
684static void le_disable_advertising(struct hci_dev *hdev)
685{
686 if (ext_adv_capable(hdev)) {
687 struct hci_cp_le_set_ext_adv_enable cp;
688
689 cp.enable = 0x00;
690 cp.num_of_sets = 0x00;
691
692 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
693 &cp);
694 } else {
695 u8 enable = 0x00;
696 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
697 &enable);
698 }
699}
700
701static void le_conn_timeout(struct work_struct *work)
702{
703 struct hci_conn *conn = container_of(work, struct hci_conn,
704 le_conn_timeout.work);
705 struct hci_dev *hdev = conn->hdev;
706
707 BT_DBG("");
708
709 /* We could end up here due to having done directed advertising,
710 * so clean up the state if necessary. This should however only
711 * happen with broken hardware or if low duty cycle was used
712 * (which doesn't have a timeout of its own).
713 */
714 if (conn->role == HCI_ROLE_SLAVE) {
715 /* Disable LE Advertising */
716 le_disable_advertising(hdev);
717 hci_dev_lock(hdev);
718 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
719 hci_dev_unlock(hdev);
720 return;
721 }
722
723 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
724}
725
726struct iso_cig_params {
727 struct hci_cp_le_set_cig_params cp;
728 struct hci_cis_params cis[0x1f];
729};
730
731struct iso_list_data {
732 union {
733 u8 cig;
734 u8 big;
735 };
736 union {
737 u8 cis;
738 u8 bis;
739 u16 sync_handle;
740 };
741 int count;
742 bool big_term;
743 bool pa_sync_term;
744 bool big_sync_term;
745};
746
747static void bis_list(struct hci_conn *conn, void *data)
748{
749 struct iso_list_data *d = data;
750
751 /* Skip if not broadcast/ANY address */
752 if (bacmp(&conn->dst, BDADDR_ANY))
753 return;
754
755 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
756 d->bis != conn->iso_qos.bcast.bis)
757 return;
758
759 d->count++;
760}
761
762static int terminate_big_sync(struct hci_dev *hdev, void *data)
763{
764 struct iso_list_data *d = data;
765
766 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
767
768 hci_disable_per_advertising_sync(hdev, d->bis);
769 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
770
771 /* Only terminate BIG if it has been created */
772 if (!d->big_term)
773 return 0;
774
775 return hci_le_terminate_big_sync(hdev, d->big,
776 HCI_ERROR_LOCAL_HOST_TERM);
777}
778
779static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
780{
781 kfree(data);
782}
783
784static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
785{
786 struct iso_list_data *d;
787 int ret;
788
789 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
790 conn->iso_qos.bcast.bis);
791
792 d = kzalloc(sizeof(*d), GFP_KERNEL);
793 if (!d)
794 return -ENOMEM;
795
796 d->big = conn->iso_qos.bcast.big;
797 d->bis = conn->iso_qos.bcast.bis;
798 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
799
800 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
801 terminate_big_destroy);
802 if (ret)
803 kfree(d);
804
805 return ret;
806}
807
808static int big_terminate_sync(struct hci_dev *hdev, void *data)
809{
810 struct iso_list_data *d = data;
811
812 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
813 d->sync_handle);
814
815 if (d->big_sync_term)
816 hci_le_big_terminate_sync(hdev, d->big);
817
818 if (d->pa_sync_term)
819 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
820
821 return 0;
822}
823
824static void find_bis(struct hci_conn *conn, void *data)
825{
826 struct iso_list_data *d = data;
827
828 /* Ignore if BIG doesn't match */
829 if (d->big != conn->iso_qos.bcast.big)
830 return;
831
832 d->count++;
833}
834
835static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
836{
837 struct iso_list_data *d;
838 int ret;
839
840 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
841
842 d = kzalloc(sizeof(*d), GFP_KERNEL);
843 if (!d)
844 return -ENOMEM;
845
846 memset(d, 0, sizeof(*d));
847 d->big = big;
848 d->sync_handle = conn->sync_handle;
849
850 if (test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
851 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
852 HCI_CONN_PA_SYNC, d);
853
854 if (!d->count)
855 d->pa_sync_term = true;
856
857 d->count = 0;
858 }
859
860 if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) {
861 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
862 HCI_CONN_BIG_SYNC, d);
863
864 if (!d->count)
865 d->big_sync_term = true;
866 }
867
868 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
869 terminate_big_destroy);
870 if (ret)
871 kfree(d);
872
873 return ret;
874}
875
876/* Cleanup BIS connection
877 *
878 * Detects if there any BIS left connected in a BIG
879 * broadcaster: Remove advertising instance and terminate BIG.
880 * broadcaster receiver: Teminate BIG sync and terminate PA sync.
881 */
882static void bis_cleanup(struct hci_conn *conn)
883{
884 struct hci_dev *hdev = conn->hdev;
885 struct hci_conn *bis;
886
887 bt_dev_dbg(hdev, "conn %p", conn);
888
889 if (conn->role == HCI_ROLE_MASTER) {
890 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
891 return;
892
893 /* Check if ISO connection is a BIS and terminate advertising
894 * set and BIG if there are no other connections using it.
895 */
896 bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big);
897 if (bis)
898 return;
899
900 hci_le_terminate_big(hdev, conn);
901 } else {
902 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
903 conn);
904 }
905}
906
907static int remove_cig_sync(struct hci_dev *hdev, void *data)
908{
909 u8 handle = PTR_UINT(data);
910
911 return hci_le_remove_cig_sync(hdev, handle);
912}
913
914static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
915{
916 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
917
918 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
919 NULL);
920}
921
922static void find_cis(struct hci_conn *conn, void *data)
923{
924 struct iso_list_data *d = data;
925
926 /* Ignore broadcast or if CIG don't match */
927 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
928 return;
929
930 d->count++;
931}
932
933/* Cleanup CIS connection:
934 *
935 * Detects if there any CIS left connected in a CIG and remove it.
936 */
937static void cis_cleanup(struct hci_conn *conn)
938{
939 struct hci_dev *hdev = conn->hdev;
940 struct iso_list_data d;
941
942 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
943 return;
944
945 memset(&d, 0, sizeof(d));
946 d.cig = conn->iso_qos.ucast.cig;
947
948 /* Check if ISO connection is a CIS and remove CIG if there are
949 * no other connections using it.
950 */
951 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_BOUND, &d);
952 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECT, &d);
953 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
954 if (d.count)
955 return;
956
957 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
958}
959
960static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
961{
962 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
963 U16_MAX, GFP_ATOMIC);
964}
965
966struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
967 u8 role, u16 handle)
968{
969 struct hci_conn *conn;
970
971 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
972
973 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
974 if (!conn)
975 return NULL;
976
977 bacpy(&conn->dst, dst);
978 bacpy(&conn->src, &hdev->bdaddr);
979 conn->handle = handle;
980 conn->hdev = hdev;
981 conn->type = type;
982 conn->role = role;
983 conn->mode = HCI_CM_ACTIVE;
984 conn->state = BT_OPEN;
985 conn->auth_type = HCI_AT_GENERAL_BONDING;
986 conn->io_capability = hdev->io_capability;
987 conn->remote_auth = 0xff;
988 conn->key_type = 0xff;
989 conn->rssi = HCI_RSSI_INVALID;
990 conn->tx_power = HCI_TX_POWER_INVALID;
991 conn->max_tx_power = HCI_TX_POWER_INVALID;
992 conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
993
994 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
995 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
996
997 /* Set Default Authenticated payload timeout to 30s */
998 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
999
1000 if (conn->role == HCI_ROLE_MASTER)
1001 conn->out = true;
1002
1003 switch (type) {
1004 case ACL_LINK:
1005 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
1006 break;
1007 case LE_LINK:
1008 /* conn->src should reflect the local identity address */
1009 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1010 break;
1011 case ISO_LINK:
1012 /* conn->src should reflect the local identity address */
1013 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1014
1015 /* set proper cleanup function */
1016 if (!bacmp(dst, BDADDR_ANY))
1017 conn->cleanup = bis_cleanup;
1018 else if (conn->role == HCI_ROLE_MASTER)
1019 conn->cleanup = cis_cleanup;
1020
1021 break;
1022 case SCO_LINK:
1023 if (lmp_esco_capable(hdev))
1024 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
1025 (hdev->esco_type & EDR_ESCO_MASK);
1026 else
1027 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1028 break;
1029 case ESCO_LINK:
1030 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1031 break;
1032 }
1033
1034 skb_queue_head_init(&conn->data_q);
1035
1036 INIT_LIST_HEAD(&conn->chan_list);
1037 INIT_LIST_HEAD(&conn->link_list);
1038
1039 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1040 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1041 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1042 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1043
1044 atomic_set(&conn->refcnt, 0);
1045
1046 hci_dev_hold(hdev);
1047
1048 hci_conn_hash_add(hdev, conn);
1049
1050 /* The SCO and eSCO connections will only be notified when their
1051 * setup has been completed. This is different to ACL links which
1052 * can be notified right away.
1053 */
1054 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1055 if (hdev->notify)
1056 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1057 }
1058
1059 hci_conn_init_sysfs(conn);
1060
1061 return conn;
1062}
1063
1064struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1065 bdaddr_t *dst, u8 role)
1066{
1067 int handle;
1068
1069 bt_dev_dbg(hdev, "dst %pMR", dst);
1070
1071 handle = hci_conn_hash_alloc_unset(hdev);
1072 if (unlikely(handle < 0))
1073 return NULL;
1074
1075 return hci_conn_add(hdev, type, dst, role, handle);
1076}
1077
1078static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1079{
1080 if (!reason)
1081 reason = HCI_ERROR_REMOTE_USER_TERM;
1082
1083 /* Due to race, SCO/ISO conn might be not established yet at this point,
1084 * and nothing else will clean it up. In other cases it is done via HCI
1085 * events.
1086 */
1087 switch (conn->type) {
1088 case SCO_LINK:
1089 case ESCO_LINK:
1090 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1091 hci_conn_failed(conn, reason);
1092 break;
1093 case ISO_LINK:
1094 if ((conn->state != BT_CONNECTED &&
1095 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) ||
1096 test_bit(HCI_CONN_BIG_CREATED, &conn->flags))
1097 hci_conn_failed(conn, reason);
1098 break;
1099 }
1100}
1101
1102static void hci_conn_unlink(struct hci_conn *conn)
1103{
1104 struct hci_dev *hdev = conn->hdev;
1105
1106 bt_dev_dbg(hdev, "hcon %p", conn);
1107
1108 if (!conn->parent) {
1109 struct hci_link *link, *t;
1110
1111 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1112 struct hci_conn *child = link->conn;
1113
1114 hci_conn_unlink(child);
1115
1116 /* If hdev is down it means
1117 * hci_dev_close_sync/hci_conn_hash_flush is in progress
1118 * and links don't need to be cleanup as all connections
1119 * would be cleanup.
1120 */
1121 if (!test_bit(HCI_UP, &hdev->flags))
1122 continue;
1123
1124 hci_conn_cleanup_child(child, conn->abort_reason);
1125 }
1126
1127 return;
1128 }
1129
1130 if (!conn->link)
1131 return;
1132
1133 list_del_rcu(&conn->link->list);
1134 synchronize_rcu();
1135
1136 hci_conn_drop(conn->parent);
1137 hci_conn_put(conn->parent);
1138 conn->parent = NULL;
1139
1140 kfree(conn->link);
1141 conn->link = NULL;
1142}
1143
1144void hci_conn_del(struct hci_conn *conn)
1145{
1146 struct hci_dev *hdev = conn->hdev;
1147
1148 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1149
1150 hci_conn_unlink(conn);
1151
1152 cancel_delayed_work_sync(&conn->disc_work);
1153 cancel_delayed_work_sync(&conn->auto_accept_work);
1154 cancel_delayed_work_sync(&conn->idle_work);
1155
1156 if (conn->type == ACL_LINK) {
1157 /* Unacked frames */
1158 hdev->acl_cnt += conn->sent;
1159 } else if (conn->type == LE_LINK) {
1160 cancel_delayed_work(&conn->le_conn_timeout);
1161
1162 if (hdev->le_pkts)
1163 hdev->le_cnt += conn->sent;
1164 else
1165 hdev->acl_cnt += conn->sent;
1166 } else {
1167 /* Unacked ISO frames */
1168 if (conn->type == ISO_LINK) {
1169 if (hdev->iso_pkts)
1170 hdev->iso_cnt += conn->sent;
1171 else if (hdev->le_pkts)
1172 hdev->le_cnt += conn->sent;
1173 else
1174 hdev->acl_cnt += conn->sent;
1175 }
1176 }
1177
1178 if (conn->amp_mgr)
1179 amp_mgr_put(conn->amp_mgr);
1180
1181 skb_queue_purge(&conn->data_q);
1182
1183 /* Remove the connection from the list and cleanup its remaining
1184 * state. This is a separate function since for some cases like
1185 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1186 * rest of hci_conn_del.
1187 */
1188 hci_conn_cleanup(conn);
1189}
1190
1191struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1192{
1193 int use_src = bacmp(src, BDADDR_ANY);
1194 struct hci_dev *hdev = NULL, *d;
1195
1196 BT_DBG("%pMR -> %pMR", src, dst);
1197
1198 read_lock(&hci_dev_list_lock);
1199
1200 list_for_each_entry(d, &hci_dev_list, list) {
1201 if (!test_bit(HCI_UP, &d->flags) ||
1202 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
1203 d->dev_type != HCI_PRIMARY)
1204 continue;
1205
1206 /* Simple routing:
1207 * No source address - find interface with bdaddr != dst
1208 * Source address - find interface with bdaddr == src
1209 */
1210
1211 if (use_src) {
1212 bdaddr_t id_addr;
1213 u8 id_addr_type;
1214
1215 if (src_type == BDADDR_BREDR) {
1216 if (!lmp_bredr_capable(d))
1217 continue;
1218 bacpy(&id_addr, &d->bdaddr);
1219 id_addr_type = BDADDR_BREDR;
1220 } else {
1221 if (!lmp_le_capable(d))
1222 continue;
1223
1224 hci_copy_identity_address(d, &id_addr,
1225 &id_addr_type);
1226
1227 /* Convert from HCI to three-value type */
1228 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1229 id_addr_type = BDADDR_LE_PUBLIC;
1230 else
1231 id_addr_type = BDADDR_LE_RANDOM;
1232 }
1233
1234 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1235 hdev = d; break;
1236 }
1237 } else {
1238 if (bacmp(&d->bdaddr, dst)) {
1239 hdev = d; break;
1240 }
1241 }
1242 }
1243
1244 if (hdev)
1245 hdev = hci_dev_hold(hdev);
1246
1247 read_unlock(&hci_dev_list_lock);
1248 return hdev;
1249}
1250EXPORT_SYMBOL(hci_get_route);
1251
1252/* This function requires the caller holds hdev->lock */
1253static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1254{
1255 struct hci_dev *hdev = conn->hdev;
1256
1257 hci_connect_le_scan_cleanup(conn, status);
1258
1259 /* Enable advertising in case this was a failed connection
1260 * attempt as a peripheral.
1261 */
1262 hci_enable_advertising(hdev);
1263}
1264
1265/* This function requires the caller holds hdev->lock */
1266void hci_conn_failed(struct hci_conn *conn, u8 status)
1267{
1268 struct hci_dev *hdev = conn->hdev;
1269
1270 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1271
1272 switch (conn->type) {
1273 case LE_LINK:
1274 hci_le_conn_failed(conn, status);
1275 break;
1276 case ACL_LINK:
1277 mgmt_connect_failed(hdev, &conn->dst, conn->type,
1278 conn->dst_type, status);
1279 break;
1280 }
1281
1282 /* In case of BIG/PA sync failed, clear conn flags so that
1283 * the conns will be correctly cleaned up by ISO layer
1284 */
1285 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1286 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1287
1288 conn->state = BT_CLOSED;
1289 hci_connect_cfm(conn, status);
1290 hci_conn_del(conn);
1291}
1292
1293/* This function requires the caller holds hdev->lock */
1294u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1295{
1296 struct hci_dev *hdev = conn->hdev;
1297
1298 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1299
1300 if (conn->handle == handle)
1301 return 0;
1302
1303 if (handle > HCI_CONN_HANDLE_MAX) {
1304 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1305 handle, HCI_CONN_HANDLE_MAX);
1306 return HCI_ERROR_INVALID_PARAMETERS;
1307 }
1308
1309 /* If abort_reason has been sent it means the connection is being
1310 * aborted and the handle shall not be changed.
1311 */
1312 if (conn->abort_reason)
1313 return conn->abort_reason;
1314
1315 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1316 ida_free(&hdev->unset_handle_ida, conn->handle);
1317
1318 conn->handle = handle;
1319
1320 return 0;
1321}
1322
1323static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
1324{
1325 struct hci_conn *conn;
1326 u16 handle = PTR_UINT(data);
1327
1328 conn = hci_conn_hash_lookup_handle(hdev, handle);
1329 if (!conn)
1330 return;
1331
1332 bt_dev_dbg(hdev, "err %d", err);
1333
1334 hci_dev_lock(hdev);
1335
1336 if (!err) {
1337 hci_connect_le_scan_cleanup(conn, 0x00);
1338 goto done;
1339 }
1340
1341 /* Check if connection is still pending */
1342 if (conn != hci_lookup_le_connect(hdev))
1343 goto done;
1344
1345 /* Flush to make sure we send create conn cancel command if needed */
1346 flush_delayed_work(&conn->le_conn_timeout);
1347 hci_conn_failed(conn, bt_status(err));
1348
1349done:
1350 hci_dev_unlock(hdev);
1351}
1352
1353static int hci_connect_le_sync(struct hci_dev *hdev, void *data)
1354{
1355 struct hci_conn *conn;
1356 u16 handle = PTR_UINT(data);
1357
1358 conn = hci_conn_hash_lookup_handle(hdev, handle);
1359 if (!conn)
1360 return 0;
1361
1362 bt_dev_dbg(hdev, "conn %p", conn);
1363
1364 clear_bit(HCI_CONN_SCANNING, &conn->flags);
1365 conn->state = BT_CONNECT;
1366
1367 return hci_le_create_conn_sync(hdev, conn);
1368}
1369
1370struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1371 u8 dst_type, bool dst_resolved, u8 sec_level,
1372 u16 conn_timeout, u8 role)
1373{
1374 struct hci_conn *conn;
1375 struct smp_irk *irk;
1376 int err;
1377
1378 /* Let's make sure that le is enabled.*/
1379 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1380 if (lmp_le_capable(hdev))
1381 return ERR_PTR(-ECONNREFUSED);
1382
1383 return ERR_PTR(-EOPNOTSUPP);
1384 }
1385
1386 /* Since the controller supports only one LE connection attempt at a
1387 * time, we return -EBUSY if there is any connection attempt running.
1388 */
1389 if (hci_lookup_le_connect(hdev))
1390 return ERR_PTR(-EBUSY);
1391
1392 /* If there's already a connection object but it's not in
1393 * scanning state it means it must already be established, in
1394 * which case we can't do anything else except report a failure
1395 * to connect.
1396 */
1397 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1398 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1399 return ERR_PTR(-EBUSY);
1400 }
1401
1402 /* Check if the destination address has been resolved by the controller
1403 * since if it did then the identity address shall be used.
1404 */
1405 if (!dst_resolved) {
1406 /* When given an identity address with existing identity
1407 * resolving key, the connection needs to be established
1408 * to a resolvable random address.
1409 *
1410 * Storing the resolvable random address is required here
1411 * to handle connection failures. The address will later
1412 * be resolved back into the original identity address
1413 * from the connect request.
1414 */
1415 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1416 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1417 dst = &irk->rpa;
1418 dst_type = ADDR_LE_DEV_RANDOM;
1419 }
1420 }
1421
1422 if (conn) {
1423 bacpy(&conn->dst, dst);
1424 } else {
1425 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1426 if (!conn)
1427 return ERR_PTR(-ENOMEM);
1428 hci_conn_hold(conn);
1429 conn->pending_sec_level = sec_level;
1430 }
1431
1432 conn->dst_type = dst_type;
1433 conn->sec_level = BT_SECURITY_LOW;
1434 conn->conn_timeout = conn_timeout;
1435
1436 err = hci_cmd_sync_queue(hdev, hci_connect_le_sync,
1437 UINT_PTR(conn->handle),
1438 create_le_conn_complete);
1439 if (err) {
1440 hci_conn_del(conn);
1441 return ERR_PTR(err);
1442 }
1443
1444 return conn;
1445}
1446
1447static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1448{
1449 struct hci_conn *conn;
1450
1451 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1452 if (!conn)
1453 return false;
1454
1455 if (conn->state != BT_CONNECTED)
1456 return false;
1457
1458 return true;
1459}
1460
1461/* This function requires the caller holds hdev->lock */
1462static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1463 bdaddr_t *addr, u8 addr_type)
1464{
1465 struct hci_conn_params *params;
1466
1467 if (is_connected(hdev, addr, addr_type))
1468 return -EISCONN;
1469
1470 params = hci_conn_params_lookup(hdev, addr, addr_type);
1471 if (!params) {
1472 params = hci_conn_params_add(hdev, addr, addr_type);
1473 if (!params)
1474 return -ENOMEM;
1475
1476 /* If we created new params, mark them to be deleted in
1477 * hci_connect_le_scan_cleanup. It's different case than
1478 * existing disabled params, those will stay after cleanup.
1479 */
1480 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1481 }
1482
1483 /* We're trying to connect, so make sure params are at pend_le_conns */
1484 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1485 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1486 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1487 hci_pend_le_list_del_init(params);
1488 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1489 }
1490
1491 params->explicit_connect = true;
1492
1493 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1494 params->auto_connect);
1495
1496 return 0;
1497}
1498
1499static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1500{
1501 struct hci_conn *conn;
1502 u8 big;
1503
1504 /* Allocate a BIG if not set */
1505 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1506 for (big = 0x00; big < 0xef; big++) {
1507
1508 conn = hci_conn_hash_lookup_big(hdev, big);
1509 if (!conn)
1510 break;
1511 }
1512
1513 if (big == 0xef)
1514 return -EADDRNOTAVAIL;
1515
1516 /* Update BIG */
1517 qos->bcast.big = big;
1518 }
1519
1520 return 0;
1521}
1522
1523static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1524{
1525 struct hci_conn *conn;
1526 u8 bis;
1527
1528 /* Allocate BIS if not set */
1529 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1530 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1531 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1532
1533 if (conn) {
1534 /* If the BIG handle is already matched to an advertising
1535 * handle, do not allocate a new one.
1536 */
1537 qos->bcast.bis = conn->iso_qos.bcast.bis;
1538 return 0;
1539 }
1540 }
1541
1542 /* Find an unused adv set to advertise BIS, skip instance 0x00
1543 * since it is reserved as general purpose set.
1544 */
1545 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1546 bis++) {
1547
1548 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1549 if (!conn)
1550 break;
1551 }
1552
1553 if (bis == hdev->le_num_of_adv_sets)
1554 return -EADDRNOTAVAIL;
1555
1556 /* Update BIS */
1557 qos->bcast.bis = bis;
1558 }
1559
1560 return 0;
1561}
1562
1563/* This function requires the caller holds hdev->lock */
1564static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1565 struct bt_iso_qos *qos, __u8 base_len,
1566 __u8 *base)
1567{
1568 struct hci_conn *conn;
1569 int err;
1570
1571 /* Let's make sure that le is enabled.*/
1572 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1573 if (lmp_le_capable(hdev))
1574 return ERR_PTR(-ECONNREFUSED);
1575 return ERR_PTR(-EOPNOTSUPP);
1576 }
1577
1578 err = qos_set_big(hdev, qos);
1579 if (err)
1580 return ERR_PTR(err);
1581
1582 err = qos_set_bis(hdev, qos);
1583 if (err)
1584 return ERR_PTR(err);
1585
1586 /* Check if the LE Create BIG command has already been sent */
1587 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1588 qos->bcast.big);
1589 if (conn)
1590 return ERR_PTR(-EADDRINUSE);
1591
1592 /* Check BIS settings against other bound BISes, since all
1593 * BISes in a BIG must have the same value for all parameters
1594 */
1595 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1596
1597 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1598 base_len != conn->le_per_adv_data_len ||
1599 memcmp(conn->le_per_adv_data, base, base_len)))
1600 return ERR_PTR(-EADDRINUSE);
1601
1602 conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1603 if (!conn)
1604 return ERR_PTR(-ENOMEM);
1605
1606 conn->state = BT_CONNECT;
1607
1608 hci_conn_hold(conn);
1609 return conn;
1610}
1611
1612/* This function requires the caller holds hdev->lock */
1613struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1614 u8 dst_type, u8 sec_level,
1615 u16 conn_timeout,
1616 enum conn_reasons conn_reason)
1617{
1618 struct hci_conn *conn;
1619
1620 /* Let's make sure that le is enabled.*/
1621 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1622 if (lmp_le_capable(hdev))
1623 return ERR_PTR(-ECONNREFUSED);
1624
1625 return ERR_PTR(-EOPNOTSUPP);
1626 }
1627
1628 /* Some devices send ATT messages as soon as the physical link is
1629 * established. To be able to handle these ATT messages, the user-
1630 * space first establishes the connection and then starts the pairing
1631 * process.
1632 *
1633 * So if a hci_conn object already exists for the following connection
1634 * attempt, we simply update pending_sec_level and auth_type fields
1635 * and return the object found.
1636 */
1637 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1638 if (conn) {
1639 if (conn->pending_sec_level < sec_level)
1640 conn->pending_sec_level = sec_level;
1641 goto done;
1642 }
1643
1644 BT_DBG("requesting refresh of dst_addr");
1645
1646 conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1647 if (!conn)
1648 return ERR_PTR(-ENOMEM);
1649
1650 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1651 hci_conn_del(conn);
1652 return ERR_PTR(-EBUSY);
1653 }
1654
1655 conn->state = BT_CONNECT;
1656 set_bit(HCI_CONN_SCANNING, &conn->flags);
1657 conn->dst_type = dst_type;
1658 conn->sec_level = BT_SECURITY_LOW;
1659 conn->pending_sec_level = sec_level;
1660 conn->conn_timeout = conn_timeout;
1661 conn->conn_reason = conn_reason;
1662
1663 hci_update_passive_scan(hdev);
1664
1665done:
1666 hci_conn_hold(conn);
1667 return conn;
1668}
1669
1670struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1671 u8 sec_level, u8 auth_type,
1672 enum conn_reasons conn_reason)
1673{
1674 struct hci_conn *acl;
1675
1676 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1677 if (lmp_bredr_capable(hdev))
1678 return ERR_PTR(-ECONNREFUSED);
1679
1680 return ERR_PTR(-EOPNOTSUPP);
1681 }
1682
1683 /* Reject outgoing connection to device with same BD ADDR against
1684 * CVE-2020-26555
1685 */
1686 if (!bacmp(&hdev->bdaddr, dst)) {
1687 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1688 dst);
1689 return ERR_PTR(-ECONNREFUSED);
1690 }
1691
1692 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1693 if (!acl) {
1694 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1695 if (!acl)
1696 return ERR_PTR(-ENOMEM);
1697 }
1698
1699 hci_conn_hold(acl);
1700
1701 acl->conn_reason = conn_reason;
1702 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1703 acl->sec_level = BT_SECURITY_LOW;
1704 acl->pending_sec_level = sec_level;
1705 acl->auth_type = auth_type;
1706 hci_acl_create_connection(acl);
1707 }
1708
1709 return acl;
1710}
1711
1712static struct hci_link *hci_conn_link(struct hci_conn *parent,
1713 struct hci_conn *conn)
1714{
1715 struct hci_dev *hdev = parent->hdev;
1716 struct hci_link *link;
1717
1718 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1719
1720 if (conn->link)
1721 return conn->link;
1722
1723 if (conn->parent)
1724 return NULL;
1725
1726 link = kzalloc(sizeof(*link), GFP_KERNEL);
1727 if (!link)
1728 return NULL;
1729
1730 link->conn = hci_conn_hold(conn);
1731 conn->link = link;
1732 conn->parent = hci_conn_get(parent);
1733
1734 /* Use list_add_tail_rcu append to the list */
1735 list_add_tail_rcu(&link->list, &parent->link_list);
1736
1737 return link;
1738}
1739
1740struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1741 __u16 setting, struct bt_codec *codec)
1742{
1743 struct hci_conn *acl;
1744 struct hci_conn *sco;
1745 struct hci_link *link;
1746
1747 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1748 CONN_REASON_SCO_CONNECT);
1749 if (IS_ERR(acl))
1750 return acl;
1751
1752 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1753 if (!sco) {
1754 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1755 if (!sco) {
1756 hci_conn_drop(acl);
1757 return ERR_PTR(-ENOMEM);
1758 }
1759 }
1760
1761 link = hci_conn_link(acl, sco);
1762 if (!link) {
1763 hci_conn_drop(acl);
1764 hci_conn_drop(sco);
1765 return ERR_PTR(-ENOLINK);
1766 }
1767
1768 sco->setting = setting;
1769 sco->codec = *codec;
1770
1771 if (acl->state == BT_CONNECTED &&
1772 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1773 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1774 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1775
1776 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1777 /* defer SCO setup until mode change completed */
1778 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1779 return sco;
1780 }
1781
1782 hci_sco_setup(acl, 0x00);
1783 }
1784
1785 return sco;
1786}
1787
1788static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1789{
1790 struct hci_dev *hdev = conn->hdev;
1791 struct hci_cp_le_create_big cp;
1792 struct iso_list_data data;
1793
1794 memset(&cp, 0, sizeof(cp));
1795
1796 data.big = qos->bcast.big;
1797 data.bis = qos->bcast.bis;
1798 data.count = 0;
1799
1800 /* Create a BIS for each bound connection */
1801 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
1802 BT_BOUND, &data);
1803
1804 cp.handle = qos->bcast.big;
1805 cp.adv_handle = qos->bcast.bis;
1806 cp.num_bis = data.count;
1807 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1808 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1809 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1810 cp.bis.rtn = qos->bcast.out.rtn;
1811 cp.bis.phy = qos->bcast.out.phy;
1812 cp.bis.packing = qos->bcast.packing;
1813 cp.bis.framing = qos->bcast.framing;
1814 cp.bis.encryption = qos->bcast.encryption;
1815 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1816
1817 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1818}
1819
1820static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1821{
1822 u8 cig_id = PTR_UINT(data);
1823 struct hci_conn *conn;
1824 struct bt_iso_qos *qos;
1825 struct iso_cig_params pdu;
1826 u8 cis_id;
1827
1828 conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1829 if (!conn)
1830 return 0;
1831
1832 memset(&pdu, 0, sizeof(pdu));
1833
1834 qos = &conn->iso_qos;
1835 pdu.cp.cig_id = cig_id;
1836 hci_cpu_to_le24(qos->ucast.out.interval, pdu.cp.c_interval);
1837 hci_cpu_to_le24(qos->ucast.in.interval, pdu.cp.p_interval);
1838 pdu.cp.sca = qos->ucast.sca;
1839 pdu.cp.packing = qos->ucast.packing;
1840 pdu.cp.framing = qos->ucast.framing;
1841 pdu.cp.c_latency = cpu_to_le16(qos->ucast.out.latency);
1842 pdu.cp.p_latency = cpu_to_le16(qos->ucast.in.latency);
1843
1844 /* Reprogram all CIS(s) with the same CIG, valid range are:
1845 * num_cis: 0x00 to 0x1F
1846 * cis_id: 0x00 to 0xEF
1847 */
1848 for (cis_id = 0x00; cis_id < 0xf0 &&
1849 pdu.cp.num_cis < ARRAY_SIZE(pdu.cis); cis_id++) {
1850 struct hci_cis_params *cis;
1851
1852 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1853 if (!conn)
1854 continue;
1855
1856 qos = &conn->iso_qos;
1857
1858 cis = &pdu.cis[pdu.cp.num_cis++];
1859 cis->cis_id = cis_id;
1860 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1861 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1862 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
1863 qos->ucast.in.phy;
1864 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
1865 qos->ucast.out.phy;
1866 cis->c_rtn = qos->ucast.out.rtn;
1867 cis->p_rtn = qos->ucast.in.rtn;
1868 }
1869
1870 if (!pdu.cp.num_cis)
1871 return 0;
1872
1873 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1874 sizeof(pdu.cp) +
1875 pdu.cp.num_cis * sizeof(pdu.cis[0]), &pdu,
1876 HCI_CMD_TIMEOUT);
1877}
1878
1879static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1880{
1881 struct hci_dev *hdev = conn->hdev;
1882 struct iso_list_data data;
1883
1884 memset(&data, 0, sizeof(data));
1885
1886 /* Allocate first still reconfigurable CIG if not set */
1887 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1888 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1889 data.count = 0;
1890
1891 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1892 BT_CONNECT, &data);
1893 if (data.count)
1894 continue;
1895
1896 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1897 BT_CONNECTED, &data);
1898 if (!data.count)
1899 break;
1900 }
1901
1902 if (data.cig == 0xf0)
1903 return false;
1904
1905 /* Update CIG */
1906 qos->ucast.cig = data.cig;
1907 }
1908
1909 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1910 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1911 qos->ucast.cis))
1912 return false;
1913 goto done;
1914 }
1915
1916 /* Allocate first available CIS if not set */
1917 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1918 data.cis++) {
1919 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1920 data.cis)) {
1921 /* Update CIS */
1922 qos->ucast.cis = data.cis;
1923 break;
1924 }
1925 }
1926
1927 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1928 return false;
1929
1930done:
1931 if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1932 UINT_PTR(qos->ucast.cig), NULL) < 0)
1933 return false;
1934
1935 return true;
1936}
1937
1938struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1939 __u8 dst_type, struct bt_iso_qos *qos)
1940{
1941 struct hci_conn *cis;
1942
1943 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1944 qos->ucast.cis);
1945 if (!cis) {
1946 cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1947 if (!cis)
1948 return ERR_PTR(-ENOMEM);
1949 cis->cleanup = cis_cleanup;
1950 cis->dst_type = dst_type;
1951 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1952 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1953 }
1954
1955 if (cis->state == BT_CONNECTED)
1956 return cis;
1957
1958 /* Check if CIS has been set and the settings matches */
1959 if (cis->state == BT_BOUND &&
1960 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1961 return cis;
1962
1963 /* Update LINK PHYs according to QoS preference */
1964 cis->le_tx_phy = qos->ucast.out.phy;
1965 cis->le_rx_phy = qos->ucast.in.phy;
1966
1967 /* If output interval is not set use the input interval as it cannot be
1968 * 0x000000.
1969 */
1970 if (!qos->ucast.out.interval)
1971 qos->ucast.out.interval = qos->ucast.in.interval;
1972
1973 /* If input interval is not set use the output interval as it cannot be
1974 * 0x000000.
1975 */
1976 if (!qos->ucast.in.interval)
1977 qos->ucast.in.interval = qos->ucast.out.interval;
1978
1979 /* If output latency is not set use the input latency as it cannot be
1980 * 0x0000.
1981 */
1982 if (!qos->ucast.out.latency)
1983 qos->ucast.out.latency = qos->ucast.in.latency;
1984
1985 /* If input latency is not set use the output latency as it cannot be
1986 * 0x0000.
1987 */
1988 if (!qos->ucast.in.latency)
1989 qos->ucast.in.latency = qos->ucast.out.latency;
1990
1991 if (!hci_le_set_cig_params(cis, qos)) {
1992 hci_conn_drop(cis);
1993 return ERR_PTR(-EINVAL);
1994 }
1995
1996 hci_conn_hold(cis);
1997
1998 cis->iso_qos = *qos;
1999 cis->state = BT_BOUND;
2000
2001 return cis;
2002}
2003
2004bool hci_iso_setup_path(struct hci_conn *conn)
2005{
2006 struct hci_dev *hdev = conn->hdev;
2007 struct hci_cp_le_setup_iso_path cmd;
2008
2009 memset(&cmd, 0, sizeof(cmd));
2010
2011 if (conn->iso_qos.ucast.out.sdu) {
2012 cmd.handle = cpu_to_le16(conn->handle);
2013 cmd.direction = 0x00; /* Input (Host to Controller) */
2014 cmd.path = 0x00; /* HCI path if enabled */
2015 cmd.codec = 0x03; /* Transparent Data */
2016
2017 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2018 &cmd) < 0)
2019 return false;
2020 }
2021
2022 if (conn->iso_qos.ucast.in.sdu) {
2023 cmd.handle = cpu_to_le16(conn->handle);
2024 cmd.direction = 0x01; /* Output (Controller to Host) */
2025 cmd.path = 0x00; /* HCI path if enabled */
2026 cmd.codec = 0x03; /* Transparent Data */
2027
2028 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2029 &cmd) < 0)
2030 return false;
2031 }
2032
2033 return true;
2034}
2035
2036int hci_conn_check_create_cis(struct hci_conn *conn)
2037{
2038 if (conn->type != ISO_LINK || !bacmp(&conn->dst, BDADDR_ANY))
2039 return -EINVAL;
2040
2041 if (!conn->parent || conn->parent->state != BT_CONNECTED ||
2042 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
2043 return 1;
2044
2045 return 0;
2046}
2047
2048static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
2049{
2050 return hci_le_create_cis_sync(hdev);
2051}
2052
2053int hci_le_create_cis_pending(struct hci_dev *hdev)
2054{
2055 struct hci_conn *conn;
2056 bool pending = false;
2057
2058 rcu_read_lock();
2059
2060 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2061 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2062 rcu_read_unlock();
2063 return -EBUSY;
2064 }
2065
2066 if (!hci_conn_check_create_cis(conn))
2067 pending = true;
2068 }
2069
2070 rcu_read_unlock();
2071
2072 if (!pending)
2073 return 0;
2074
2075 /* Queue Create CIS */
2076 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2077}
2078
2079static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2080 struct bt_iso_io_qos *qos, __u8 phy)
2081{
2082 /* Only set MTU if PHY is enabled */
2083 if (!qos->sdu && qos->phy) {
2084 if (hdev->iso_mtu > 0)
2085 qos->sdu = hdev->iso_mtu;
2086 else if (hdev->le_mtu > 0)
2087 qos->sdu = hdev->le_mtu;
2088 else
2089 qos->sdu = hdev->acl_mtu;
2090 }
2091
2092 /* Use the same PHY as ACL if set to any */
2093 if (qos->phy == BT_ISO_PHY_ANY)
2094 qos->phy = phy;
2095
2096 /* Use LE ACL connection interval if not set */
2097 if (!qos->interval)
2098 /* ACL interval unit in 1.25 ms to us */
2099 qos->interval = conn->le_conn_interval * 1250;
2100
2101 /* Use LE ACL connection latency if not set */
2102 if (!qos->latency)
2103 qos->latency = conn->le_conn_latency;
2104}
2105
2106static int create_big_sync(struct hci_dev *hdev, void *data)
2107{
2108 struct hci_conn *conn = data;
2109 struct bt_iso_qos *qos = &conn->iso_qos;
2110 u16 interval, sync_interval = 0;
2111 u32 flags = 0;
2112 int err;
2113
2114 if (qos->bcast.out.phy == 0x02)
2115 flags |= MGMT_ADV_FLAG_SEC_2M;
2116
2117 /* Align intervals */
2118 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2119
2120 if (qos->bcast.bis)
2121 sync_interval = interval * 4;
2122
2123 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len,
2124 conn->le_per_adv_data, flags, interval,
2125 interval, sync_interval);
2126 if (err)
2127 return err;
2128
2129 return hci_le_create_big(conn, &conn->iso_qos);
2130}
2131
2132static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
2133{
2134 struct hci_cp_le_pa_create_sync *cp = data;
2135
2136 bt_dev_dbg(hdev, "");
2137
2138 if (err)
2139 bt_dev_err(hdev, "Unable to create PA: %d", err);
2140
2141 kfree(cp);
2142}
2143
2144static int create_pa_sync(struct hci_dev *hdev, void *data)
2145{
2146 struct hci_cp_le_pa_create_sync *cp = data;
2147 int err;
2148
2149 err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
2150 sizeof(*cp), cp, HCI_CMD_TIMEOUT);
2151 if (err) {
2152 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2153 return err;
2154 }
2155
2156 return hci_update_passive_scan_sync(hdev);
2157}
2158
2159int hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, __u8 dst_type,
2160 __u8 sid, struct bt_iso_qos *qos)
2161{
2162 struct hci_cp_le_pa_create_sync *cp;
2163
2164 if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
2165 return -EBUSY;
2166
2167 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
2168 if (!cp) {
2169 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2170 return -ENOMEM;
2171 }
2172
2173 cp->options = qos->bcast.options;
2174 cp->sid = sid;
2175 cp->addr_type = dst_type;
2176 bacpy(&cp->addr, dst);
2177 cp->skip = cpu_to_le16(qos->bcast.skip);
2178 cp->sync_timeout = cpu_to_le16(qos->bcast.sync_timeout);
2179 cp->sync_cte_type = qos->bcast.sync_cte_type;
2180
2181 /* Queue start pa_create_sync and scan */
2182 return hci_cmd_sync_queue(hdev, create_pa_sync, cp, create_pa_complete);
2183}
2184
2185int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2186 struct bt_iso_qos *qos,
2187 __u16 sync_handle, __u8 num_bis, __u8 bis[])
2188{
2189 struct _packed {
2190 struct hci_cp_le_big_create_sync cp;
2191 __u8 bis[0x11];
2192 } pdu;
2193 int err;
2194
2195 if (num_bis < 0x01 || num_bis > sizeof(pdu.bis))
2196 return -EINVAL;
2197
2198 err = qos_set_big(hdev, qos);
2199 if (err)
2200 return err;
2201
2202 if (hcon)
2203 hcon->iso_qos.bcast.big = qos->bcast.big;
2204
2205 memset(&pdu, 0, sizeof(pdu));
2206 pdu.cp.handle = qos->bcast.big;
2207 pdu.cp.sync_handle = cpu_to_le16(sync_handle);
2208 pdu.cp.encryption = qos->bcast.encryption;
2209 memcpy(pdu.cp.bcode, qos->bcast.bcode, sizeof(pdu.cp.bcode));
2210 pdu.cp.mse = qos->bcast.mse;
2211 pdu.cp.timeout = cpu_to_le16(qos->bcast.timeout);
2212 pdu.cp.num_bis = num_bis;
2213 memcpy(pdu.bis, bis, num_bis);
2214
2215 return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
2216 sizeof(pdu.cp) + num_bis, &pdu);
2217}
2218
2219static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2220{
2221 struct hci_conn *conn = data;
2222
2223 bt_dev_dbg(hdev, "conn %p", conn);
2224
2225 if (err) {
2226 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2227 hci_connect_cfm(conn, err);
2228 hci_conn_del(conn);
2229 }
2230}
2231
2232struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst,
2233 struct bt_iso_qos *qos,
2234 __u8 base_len, __u8 *base)
2235{
2236 struct hci_conn *conn;
2237 struct hci_conn *parent;
2238 __u8 eir[HCI_MAX_PER_AD_LENGTH];
2239 struct hci_link *link;
2240
2241 /* Look for any BIS that is open for rebinding */
2242 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN);
2243 if (conn) {
2244 memcpy(qos, &conn->iso_qos, sizeof(*qos));
2245 conn->state = BT_CONNECTED;
2246 return conn;
2247 }
2248
2249 if (base_len && base)
2250 base_len = eir_append_service_data(eir, 0, 0x1851,
2251 base, base_len);
2252
2253 /* We need hci_conn object using the BDADDR_ANY as dst */
2254 conn = hci_add_bis(hdev, dst, qos, base_len, eir);
2255 if (IS_ERR(conn))
2256 return conn;
2257
2258 /* Update LINK PHYs according to QoS preference */
2259 conn->le_tx_phy = qos->bcast.out.phy;
2260 conn->le_tx_phy = qos->bcast.out.phy;
2261
2262 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2263 if (base_len && base) {
2264 memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2265 conn->le_per_adv_data_len = base_len;
2266 }
2267
2268 hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2269 conn->le_tx_phy ? conn->le_tx_phy :
2270 hdev->le_tx_def_phys);
2271
2272 conn->iso_qos = *qos;
2273 conn->state = BT_BOUND;
2274
2275 /* Link BISes together */
2276 parent = hci_conn_hash_lookup_big(hdev,
2277 conn->iso_qos.bcast.big);
2278 if (parent && parent != conn) {
2279 link = hci_conn_link(parent, conn);
2280 if (!link) {
2281 hci_conn_drop(conn);
2282 return ERR_PTR(-ENOLINK);
2283 }
2284
2285 /* Link takes the refcount */
2286 hci_conn_drop(conn);
2287 }
2288
2289 return conn;
2290}
2291
2292static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2293{
2294 struct iso_list_data *d = data;
2295
2296 /* Skip if not broadcast/ANY address */
2297 if (bacmp(&conn->dst, BDADDR_ANY))
2298 return;
2299
2300 if (d->big != conn->iso_qos.bcast.big ||
2301 d->bis == BT_ISO_QOS_BIS_UNSET ||
2302 d->bis != conn->iso_qos.bcast.bis)
2303 return;
2304
2305 set_bit(HCI_CONN_PER_ADV, &conn->flags);
2306}
2307
2308struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2309 __u8 dst_type, struct bt_iso_qos *qos,
2310 __u8 base_len, __u8 *base)
2311{
2312 struct hci_conn *conn;
2313 int err;
2314 struct iso_list_data data;
2315
2316 conn = hci_bind_bis(hdev, dst, qos, base_len, base);
2317 if (IS_ERR(conn))
2318 return conn;
2319
2320 if (conn->state == BT_CONNECTED)
2321 return conn;
2322
2323 data.big = qos->bcast.big;
2324 data.bis = qos->bcast.bis;
2325
2326 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2327 * the start periodic advertising and create BIG commands have
2328 * been queued
2329 */
2330 hci_conn_hash_list_state(hdev, bis_mark_per_adv, ISO_LINK,
2331 BT_BOUND, &data);
2332
2333 /* Queue start periodic advertising and create BIG */
2334 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2335 create_big_complete);
2336 if (err < 0) {
2337 hci_conn_drop(conn);
2338 return ERR_PTR(err);
2339 }
2340
2341 return conn;
2342}
2343
2344struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2345 __u8 dst_type, struct bt_iso_qos *qos)
2346{
2347 struct hci_conn *le;
2348 struct hci_conn *cis;
2349 struct hci_link *link;
2350
2351 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2352 le = hci_connect_le(hdev, dst, dst_type, false,
2353 BT_SECURITY_LOW,
2354 HCI_LE_CONN_TIMEOUT,
2355 HCI_ROLE_SLAVE);
2356 else
2357 le = hci_connect_le_scan(hdev, dst, dst_type,
2358 BT_SECURITY_LOW,
2359 HCI_LE_CONN_TIMEOUT,
2360 CONN_REASON_ISO_CONNECT);
2361 if (IS_ERR(le))
2362 return le;
2363
2364 hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2365 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2366 hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2367 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2368
2369 cis = hci_bind_cis(hdev, dst, dst_type, qos);
2370 if (IS_ERR(cis)) {
2371 hci_conn_drop(le);
2372 return cis;
2373 }
2374
2375 link = hci_conn_link(le, cis);
2376 if (!link) {
2377 hci_conn_drop(le);
2378 hci_conn_drop(cis);
2379 return ERR_PTR(-ENOLINK);
2380 }
2381
2382 /* Link takes the refcount */
2383 hci_conn_drop(cis);
2384
2385 cis->state = BT_CONNECT;
2386
2387 hci_le_create_cis_pending(hdev);
2388
2389 return cis;
2390}
2391
2392/* Check link security requirement */
2393int hci_conn_check_link_mode(struct hci_conn *conn)
2394{
2395 BT_DBG("hcon %p", conn);
2396
2397 /* In Secure Connections Only mode, it is required that Secure
2398 * Connections is used and the link is encrypted with AES-CCM
2399 * using a P-256 authenticated combination key.
2400 */
2401 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2402 if (!hci_conn_sc_enabled(conn) ||
2403 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2404 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2405 return 0;
2406 }
2407
2408 /* AES encryption is required for Level 4:
2409 *
2410 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2411 * page 1319:
2412 *
2413 * 128-bit equivalent strength for link and encryption keys
2414 * required using FIPS approved algorithms (E0 not allowed,
2415 * SAFER+ not allowed, and P-192 not allowed; encryption key
2416 * not shortened)
2417 */
2418 if (conn->sec_level == BT_SECURITY_FIPS &&
2419 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2420 bt_dev_err(conn->hdev,
2421 "Invalid security: Missing AES-CCM usage");
2422 return 0;
2423 }
2424
2425 if (hci_conn_ssp_enabled(conn) &&
2426 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2427 return 0;
2428
2429 return 1;
2430}
2431
2432/* Authenticate remote device */
2433static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2434{
2435 BT_DBG("hcon %p", conn);
2436
2437 if (conn->pending_sec_level > sec_level)
2438 sec_level = conn->pending_sec_level;
2439
2440 if (sec_level > conn->sec_level)
2441 conn->pending_sec_level = sec_level;
2442 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2443 return 1;
2444
2445 /* Make sure we preserve an existing MITM requirement*/
2446 auth_type |= (conn->auth_type & 0x01);
2447
2448 conn->auth_type = auth_type;
2449
2450 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2451 struct hci_cp_auth_requested cp;
2452
2453 cp.handle = cpu_to_le16(conn->handle);
2454 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2455 sizeof(cp), &cp);
2456
2457 /* Set the ENCRYPT_PEND to trigger encryption after
2458 * authentication.
2459 */
2460 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2461 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2462 }
2463
2464 return 0;
2465}
2466
2467/* Encrypt the link */
2468static void hci_conn_encrypt(struct hci_conn *conn)
2469{
2470 BT_DBG("hcon %p", conn);
2471
2472 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2473 struct hci_cp_set_conn_encrypt cp;
2474 cp.handle = cpu_to_le16(conn->handle);
2475 cp.encrypt = 0x01;
2476 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2477 &cp);
2478 }
2479}
2480
2481/* Enable security */
2482int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2483 bool initiator)
2484{
2485 BT_DBG("hcon %p", conn);
2486
2487 if (conn->type == LE_LINK)
2488 return smp_conn_security(conn, sec_level);
2489
2490 /* For sdp we don't need the link key. */
2491 if (sec_level == BT_SECURITY_SDP)
2492 return 1;
2493
2494 /* For non 2.1 devices and low security level we don't need the link
2495 key. */
2496 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2497 return 1;
2498
2499 /* For other security levels we need the link key. */
2500 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2501 goto auth;
2502
2503 switch (conn->key_type) {
2504 case HCI_LK_AUTH_COMBINATION_P256:
2505 /* An authenticated FIPS approved combination key has
2506 * sufficient security for security level 4 or lower.
2507 */
2508 if (sec_level <= BT_SECURITY_FIPS)
2509 goto encrypt;
2510 break;
2511 case HCI_LK_AUTH_COMBINATION_P192:
2512 /* An authenticated combination key has sufficient security for
2513 * security level 3 or lower.
2514 */
2515 if (sec_level <= BT_SECURITY_HIGH)
2516 goto encrypt;
2517 break;
2518 case HCI_LK_UNAUTH_COMBINATION_P192:
2519 case HCI_LK_UNAUTH_COMBINATION_P256:
2520 /* An unauthenticated combination key has sufficient security
2521 * for security level 2 or lower.
2522 */
2523 if (sec_level <= BT_SECURITY_MEDIUM)
2524 goto encrypt;
2525 break;
2526 case HCI_LK_COMBINATION:
2527 /* A combination key has always sufficient security for the
2528 * security levels 2 or lower. High security level requires the
2529 * combination key is generated using maximum PIN code length
2530 * (16). For pre 2.1 units.
2531 */
2532 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2533 goto encrypt;
2534 break;
2535 default:
2536 break;
2537 }
2538
2539auth:
2540 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2541 return 0;
2542
2543 if (initiator)
2544 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2545
2546 if (!hci_conn_auth(conn, sec_level, auth_type))
2547 return 0;
2548
2549encrypt:
2550 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2551 /* Ensure that the encryption key size has been read,
2552 * otherwise stall the upper layer responses.
2553 */
2554 if (!conn->enc_key_size)
2555 return 0;
2556
2557 /* Nothing else needed, all requirements are met */
2558 return 1;
2559 }
2560
2561 hci_conn_encrypt(conn);
2562 return 0;
2563}
2564EXPORT_SYMBOL(hci_conn_security);
2565
2566/* Check secure link requirement */
2567int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2568{
2569 BT_DBG("hcon %p", conn);
2570
2571 /* Accept if non-secure or higher security level is required */
2572 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2573 return 1;
2574
2575 /* Accept if secure or higher security level is already present */
2576 if (conn->sec_level == BT_SECURITY_HIGH ||
2577 conn->sec_level == BT_SECURITY_FIPS)
2578 return 1;
2579
2580 /* Reject not secure link */
2581 return 0;
2582}
2583EXPORT_SYMBOL(hci_conn_check_secure);
2584
2585/* Switch role */
2586int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2587{
2588 BT_DBG("hcon %p", conn);
2589
2590 if (role == conn->role)
2591 return 1;
2592
2593 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2594 struct hci_cp_switch_role cp;
2595 bacpy(&cp.bdaddr, &conn->dst);
2596 cp.role = role;
2597 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2598 }
2599
2600 return 0;
2601}
2602EXPORT_SYMBOL(hci_conn_switch_role);
2603
2604/* Enter active mode */
2605void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2606{
2607 struct hci_dev *hdev = conn->hdev;
2608
2609 BT_DBG("hcon %p mode %d", conn, conn->mode);
2610
2611 if (conn->mode != HCI_CM_SNIFF)
2612 goto timer;
2613
2614 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2615 goto timer;
2616
2617 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2618 struct hci_cp_exit_sniff_mode cp;
2619 cp.handle = cpu_to_le16(conn->handle);
2620 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2621 }
2622
2623timer:
2624 if (hdev->idle_timeout > 0)
2625 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2626 msecs_to_jiffies(hdev->idle_timeout));
2627}
2628
2629/* Drop all connection on the device */
2630void hci_conn_hash_flush(struct hci_dev *hdev)
2631{
2632 struct list_head *head = &hdev->conn_hash.list;
2633 struct hci_conn *conn;
2634
2635 BT_DBG("hdev %s", hdev->name);
2636
2637 /* We should not traverse the list here, because hci_conn_del
2638 * can remove extra links, which may cause the list traversal
2639 * to hit items that have already been released.
2640 */
2641 while ((conn = list_first_entry_or_null(head,
2642 struct hci_conn,
2643 list)) != NULL) {
2644 conn->state = BT_CLOSED;
2645 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2646 hci_conn_del(conn);
2647 }
2648}
2649
2650/* Check pending connect attempts */
2651void hci_conn_check_pending(struct hci_dev *hdev)
2652{
2653 struct hci_conn *conn;
2654
2655 BT_DBG("hdev %s", hdev->name);
2656
2657 hci_dev_lock(hdev);
2658
2659 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
2660 if (conn)
2661 hci_acl_create_connection(conn);
2662
2663 hci_dev_unlock(hdev);
2664}
2665
2666static u32 get_link_mode(struct hci_conn *conn)
2667{
2668 u32 link_mode = 0;
2669
2670 if (conn->role == HCI_ROLE_MASTER)
2671 link_mode |= HCI_LM_MASTER;
2672
2673 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2674 link_mode |= HCI_LM_ENCRYPT;
2675
2676 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2677 link_mode |= HCI_LM_AUTH;
2678
2679 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2680 link_mode |= HCI_LM_SECURE;
2681
2682 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2683 link_mode |= HCI_LM_FIPS;
2684
2685 return link_mode;
2686}
2687
2688int hci_get_conn_list(void __user *arg)
2689{
2690 struct hci_conn *c;
2691 struct hci_conn_list_req req, *cl;
2692 struct hci_conn_info *ci;
2693 struct hci_dev *hdev;
2694 int n = 0, size, err;
2695
2696 if (copy_from_user(&req, arg, sizeof(req)))
2697 return -EFAULT;
2698
2699 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2700 return -EINVAL;
2701
2702 size = sizeof(req) + req.conn_num * sizeof(*ci);
2703
2704 cl = kmalloc(size, GFP_KERNEL);
2705 if (!cl)
2706 return -ENOMEM;
2707
2708 hdev = hci_dev_get(req.dev_id);
2709 if (!hdev) {
2710 kfree(cl);
2711 return -ENODEV;
2712 }
2713
2714 ci = cl->conn_info;
2715
2716 hci_dev_lock(hdev);
2717 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2718 bacpy(&(ci + n)->bdaddr, &c->dst);
2719 (ci + n)->handle = c->handle;
2720 (ci + n)->type = c->type;
2721 (ci + n)->out = c->out;
2722 (ci + n)->state = c->state;
2723 (ci + n)->link_mode = get_link_mode(c);
2724 if (++n >= req.conn_num)
2725 break;
2726 }
2727 hci_dev_unlock(hdev);
2728
2729 cl->dev_id = hdev->id;
2730 cl->conn_num = n;
2731 size = sizeof(req) + n * sizeof(*ci);
2732
2733 hci_dev_put(hdev);
2734
2735 err = copy_to_user(arg, cl, size);
2736 kfree(cl);
2737
2738 return err ? -EFAULT : 0;
2739}
2740
2741int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2742{
2743 struct hci_conn_info_req req;
2744 struct hci_conn_info ci;
2745 struct hci_conn *conn;
2746 char __user *ptr = arg + sizeof(req);
2747
2748 if (copy_from_user(&req, arg, sizeof(req)))
2749 return -EFAULT;
2750
2751 hci_dev_lock(hdev);
2752 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2753 if (conn) {
2754 bacpy(&ci.bdaddr, &conn->dst);
2755 ci.handle = conn->handle;
2756 ci.type = conn->type;
2757 ci.out = conn->out;
2758 ci.state = conn->state;
2759 ci.link_mode = get_link_mode(conn);
2760 }
2761 hci_dev_unlock(hdev);
2762
2763 if (!conn)
2764 return -ENOENT;
2765
2766 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2767}
2768
2769int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2770{
2771 struct hci_auth_info_req req;
2772 struct hci_conn *conn;
2773
2774 if (copy_from_user(&req, arg, sizeof(req)))
2775 return -EFAULT;
2776
2777 hci_dev_lock(hdev);
2778 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2779 if (conn)
2780 req.type = conn->auth_type;
2781 hci_dev_unlock(hdev);
2782
2783 if (!conn)
2784 return -ENOENT;
2785
2786 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2787}
2788
2789struct hci_chan *hci_chan_create(struct hci_conn *conn)
2790{
2791 struct hci_dev *hdev = conn->hdev;
2792 struct hci_chan *chan;
2793
2794 BT_DBG("%s hcon %p", hdev->name, conn);
2795
2796 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2797 BT_DBG("Refusing to create new hci_chan");
2798 return NULL;
2799 }
2800
2801 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2802 if (!chan)
2803 return NULL;
2804
2805 chan->conn = hci_conn_get(conn);
2806 skb_queue_head_init(&chan->data_q);
2807 chan->state = BT_CONNECTED;
2808
2809 list_add_rcu(&chan->list, &conn->chan_list);
2810
2811 return chan;
2812}
2813
2814void hci_chan_del(struct hci_chan *chan)
2815{
2816 struct hci_conn *conn = chan->conn;
2817 struct hci_dev *hdev = conn->hdev;
2818
2819 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2820
2821 list_del_rcu(&chan->list);
2822
2823 synchronize_rcu();
2824
2825 /* Prevent new hci_chan's to be created for this hci_conn */
2826 set_bit(HCI_CONN_DROP, &conn->flags);
2827
2828 hci_conn_put(conn);
2829
2830 skb_queue_purge(&chan->data_q);
2831 kfree(chan);
2832}
2833
2834void hci_chan_list_flush(struct hci_conn *conn)
2835{
2836 struct hci_chan *chan, *n;
2837
2838 BT_DBG("hcon %p", conn);
2839
2840 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2841 hci_chan_del(chan);
2842}
2843
2844static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2845 __u16 handle)
2846{
2847 struct hci_chan *hchan;
2848
2849 list_for_each_entry(hchan, &hcon->chan_list, list) {
2850 if (hchan->handle == handle)
2851 return hchan;
2852 }
2853
2854 return NULL;
2855}
2856
2857struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2858{
2859 struct hci_conn_hash *h = &hdev->conn_hash;
2860 struct hci_conn *hcon;
2861 struct hci_chan *hchan = NULL;
2862
2863 rcu_read_lock();
2864
2865 list_for_each_entry_rcu(hcon, &h->list, list) {
2866 hchan = __hci_chan_lookup_handle(hcon, handle);
2867 if (hchan)
2868 break;
2869 }
2870
2871 rcu_read_unlock();
2872
2873 return hchan;
2874}
2875
2876u32 hci_conn_get_phy(struct hci_conn *conn)
2877{
2878 u32 phys = 0;
2879
2880 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2881 * Table 6.2: Packets defined for synchronous, asynchronous, and
2882 * CPB logical transport types.
2883 */
2884 switch (conn->type) {
2885 case SCO_LINK:
2886 /* SCO logical transport (1 Mb/s):
2887 * HV1, HV2, HV3 and DV.
2888 */
2889 phys |= BT_PHY_BR_1M_1SLOT;
2890
2891 break;
2892
2893 case ACL_LINK:
2894 /* ACL logical transport (1 Mb/s) ptt=0:
2895 * DH1, DM3, DH3, DM5 and DH5.
2896 */
2897 phys |= BT_PHY_BR_1M_1SLOT;
2898
2899 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2900 phys |= BT_PHY_BR_1M_3SLOT;
2901
2902 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2903 phys |= BT_PHY_BR_1M_5SLOT;
2904
2905 /* ACL logical transport (2 Mb/s) ptt=1:
2906 * 2-DH1, 2-DH3 and 2-DH5.
2907 */
2908 if (!(conn->pkt_type & HCI_2DH1))
2909 phys |= BT_PHY_EDR_2M_1SLOT;
2910
2911 if (!(conn->pkt_type & HCI_2DH3))
2912 phys |= BT_PHY_EDR_2M_3SLOT;
2913
2914 if (!(conn->pkt_type & HCI_2DH5))
2915 phys |= BT_PHY_EDR_2M_5SLOT;
2916
2917 /* ACL logical transport (3 Mb/s) ptt=1:
2918 * 3-DH1, 3-DH3 and 3-DH5.
2919 */
2920 if (!(conn->pkt_type & HCI_3DH1))
2921 phys |= BT_PHY_EDR_3M_1SLOT;
2922
2923 if (!(conn->pkt_type & HCI_3DH3))
2924 phys |= BT_PHY_EDR_3M_3SLOT;
2925
2926 if (!(conn->pkt_type & HCI_3DH5))
2927 phys |= BT_PHY_EDR_3M_5SLOT;
2928
2929 break;
2930
2931 case ESCO_LINK:
2932 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2933 phys |= BT_PHY_BR_1M_1SLOT;
2934
2935 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2936 phys |= BT_PHY_BR_1M_3SLOT;
2937
2938 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2939 if (!(conn->pkt_type & ESCO_2EV3))
2940 phys |= BT_PHY_EDR_2M_1SLOT;
2941
2942 if (!(conn->pkt_type & ESCO_2EV5))
2943 phys |= BT_PHY_EDR_2M_3SLOT;
2944
2945 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2946 if (!(conn->pkt_type & ESCO_3EV3))
2947 phys |= BT_PHY_EDR_3M_1SLOT;
2948
2949 if (!(conn->pkt_type & ESCO_3EV5))
2950 phys |= BT_PHY_EDR_3M_3SLOT;
2951
2952 break;
2953
2954 case LE_LINK:
2955 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2956 phys |= BT_PHY_LE_1M_TX;
2957
2958 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2959 phys |= BT_PHY_LE_1M_RX;
2960
2961 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2962 phys |= BT_PHY_LE_2M_TX;
2963
2964 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2965 phys |= BT_PHY_LE_2M_RX;
2966
2967 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2968 phys |= BT_PHY_LE_CODED_TX;
2969
2970 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2971 phys |= BT_PHY_LE_CODED_RX;
2972
2973 break;
2974 }
2975
2976 return phys;
2977}
2978
2979static int abort_conn_sync(struct hci_dev *hdev, void *data)
2980{
2981 struct hci_conn *conn;
2982 u16 handle = PTR_UINT(data);
2983
2984 conn = hci_conn_hash_lookup_handle(hdev, handle);
2985 if (!conn)
2986 return 0;
2987
2988 return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
2989}
2990
2991int hci_abort_conn(struct hci_conn *conn, u8 reason)
2992{
2993 struct hci_dev *hdev = conn->hdev;
2994
2995 /* If abort_reason has already been set it means the connection is
2996 * already being aborted so don't attempt to overwrite it.
2997 */
2998 if (conn->abort_reason)
2999 return 0;
3000
3001 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
3002
3003 conn->abort_reason = reason;
3004
3005 /* If the connection is pending check the command opcode since that
3006 * might be blocking on hci_cmd_sync_work while waiting its respective
3007 * event so we need to hci_cmd_sync_cancel to cancel it.
3008 *
3009 * hci_connect_le serializes the connection attempts so only one
3010 * connection can be in BT_CONNECT at time.
3011 */
3012 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
3013 switch (hci_skb_event(hdev->sent_cmd)) {
3014 case HCI_EV_LE_CONN_COMPLETE:
3015 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
3016 case HCI_EVT_LE_CIS_ESTABLISHED:
3017 hci_cmd_sync_cancel(hdev, -ECANCELED);
3018 break;
3019 }
3020 }
3021
3022 return hci_cmd_sync_queue(hdev, abort_conn_sync, UINT_PTR(conn->handle),
3023 NULL);
3024}
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 (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
126 switch (conn->setting & SCO_AIRMODE_MASK) {
127 case SCO_AIRMODE_CVSD:
128 case SCO_AIRMODE_TRANSP:
129 if (hdev->notify)
130 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
131 break;
132 }
133 } else {
134 if (hdev->notify)
135 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
136 }
137
138 hci_conn_del_sysfs(conn);
139
140 debugfs_remove_recursive(conn->debugfs);
141
142 hci_dev_put(hdev);
143
144 hci_conn_put(conn);
145}
146
147static void le_scan_cleanup(struct work_struct *work)
148{
149 struct hci_conn *conn = container_of(work, struct hci_conn,
150 le_scan_cleanup);
151 struct hci_dev *hdev = conn->hdev;
152 struct hci_conn *c = NULL;
153
154 BT_DBG("%s hcon %p", hdev->name, conn);
155
156 hci_dev_lock(hdev);
157
158 /* Check that the hci_conn is still around */
159 rcu_read_lock();
160 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
161 if (c == conn)
162 break;
163 }
164 rcu_read_unlock();
165
166 if (c == conn) {
167 hci_connect_le_scan_cleanup(conn);
168 hci_conn_cleanup(conn);
169 }
170
171 hci_dev_unlock(hdev);
172 hci_dev_put(hdev);
173 hci_conn_put(conn);
174}
175
176static void hci_connect_le_scan_remove(struct hci_conn *conn)
177{
178 BT_DBG("%s hcon %p", conn->hdev->name, conn);
179
180 /* We can't call hci_conn_del/hci_conn_cleanup here since that
181 * could deadlock with another hci_conn_del() call that's holding
182 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
183 * Instead, grab temporary extra references to the hci_dev and
184 * hci_conn and perform the necessary cleanup in a separate work
185 * callback.
186 */
187
188 hci_dev_hold(conn->hdev);
189 hci_conn_get(conn);
190
191 /* Even though we hold a reference to the hdev, many other
192 * things might get cleaned up meanwhile, including the hdev's
193 * own workqueue, so we can't use that for scheduling.
194 */
195 schedule_work(&conn->le_scan_cleanup);
196}
197
198static void hci_acl_create_connection(struct hci_conn *conn)
199{
200 struct hci_dev *hdev = conn->hdev;
201 struct inquiry_entry *ie;
202 struct hci_cp_create_conn cp;
203
204 BT_DBG("hcon %p", conn);
205
206 /* Many controllers disallow HCI Create Connection while it is doing
207 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
208 * Connection. This may cause the MGMT discovering state to become false
209 * without user space's request but it is okay since the MGMT Discovery
210 * APIs do not promise that discovery should be done forever. Instead,
211 * the user space monitors the status of MGMT discovering and it may
212 * request for discovery again when this flag becomes false.
213 */
214 if (test_bit(HCI_INQUIRY, &hdev->flags)) {
215 /* Put this connection to "pending" state so that it will be
216 * executed after the inquiry cancel command complete event.
217 */
218 conn->state = BT_CONNECT2;
219 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
220 return;
221 }
222
223 conn->state = BT_CONNECT;
224 conn->out = true;
225 conn->role = HCI_ROLE_MASTER;
226
227 conn->attempt++;
228
229 conn->link_policy = hdev->link_policy;
230
231 memset(&cp, 0, sizeof(cp));
232 bacpy(&cp.bdaddr, &conn->dst);
233 cp.pscan_rep_mode = 0x02;
234
235 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
236 if (ie) {
237 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
238 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
239 cp.pscan_mode = ie->data.pscan_mode;
240 cp.clock_offset = ie->data.clock_offset |
241 cpu_to_le16(0x8000);
242 }
243
244 memcpy(conn->dev_class, ie->data.dev_class, 3);
245 }
246
247 cp.pkt_type = cpu_to_le16(conn->pkt_type);
248 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
249 cp.role_switch = 0x01;
250 else
251 cp.role_switch = 0x00;
252
253 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
254}
255
256int hci_disconnect(struct hci_conn *conn, __u8 reason)
257{
258 BT_DBG("hcon %p", conn);
259
260 /* When we are central of an established connection and it enters
261 * the disconnect timeout, then go ahead and try to read the
262 * current clock offset. Processing of the result is done
263 * within the event handling and hci_clock_offset_evt function.
264 */
265 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
266 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
267 struct hci_dev *hdev = conn->hdev;
268 struct hci_cp_read_clock_offset clkoff_cp;
269
270 clkoff_cp.handle = cpu_to_le16(conn->handle);
271 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
272 &clkoff_cp);
273 }
274
275 return hci_abort_conn(conn, reason);
276}
277
278static void hci_add_sco(struct hci_conn *conn, __u16 handle)
279{
280 struct hci_dev *hdev = conn->hdev;
281 struct hci_cp_add_sco cp;
282
283 BT_DBG("hcon %p", conn);
284
285 conn->state = BT_CONNECT;
286 conn->out = true;
287
288 conn->attempt++;
289
290 cp.handle = cpu_to_le16(handle);
291 cp.pkt_type = cpu_to_le16(conn->pkt_type);
292
293 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
294}
295
296static bool find_next_esco_param(struct hci_conn *conn,
297 const struct sco_param *esco_param, int size)
298{
299 for (; conn->attempt <= size; conn->attempt++) {
300 if (lmp_esco_2m_capable(conn->link) ||
301 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
302 break;
303 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
304 conn, conn->attempt);
305 }
306
307 return conn->attempt <= size;
308}
309
310bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
311{
312 struct hci_dev *hdev = conn->hdev;
313 struct hci_cp_setup_sync_conn cp;
314 const struct sco_param *param;
315
316 BT_DBG("hcon %p", conn);
317
318 conn->state = BT_CONNECT;
319 conn->out = true;
320
321 conn->attempt++;
322
323 cp.handle = cpu_to_le16(handle);
324
325 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
326 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
327 cp.voice_setting = cpu_to_le16(conn->setting);
328
329 switch (conn->setting & SCO_AIRMODE_MASK) {
330 case SCO_AIRMODE_TRANSP:
331 if (!find_next_esco_param(conn, esco_param_msbc,
332 ARRAY_SIZE(esco_param_msbc)))
333 return false;
334 param = &esco_param_msbc[conn->attempt - 1];
335 break;
336 case SCO_AIRMODE_CVSD:
337 if (lmp_esco_capable(conn->link)) {
338 if (!find_next_esco_param(conn, esco_param_cvsd,
339 ARRAY_SIZE(esco_param_cvsd)))
340 return false;
341 param = &esco_param_cvsd[conn->attempt - 1];
342 } else {
343 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
344 return false;
345 param = &sco_param_cvsd[conn->attempt - 1];
346 }
347 break;
348 default:
349 return false;
350 }
351
352 cp.retrans_effort = param->retrans_effort;
353 cp.pkt_type = __cpu_to_le16(param->pkt_type);
354 cp.max_latency = __cpu_to_le16(param->max_latency);
355
356 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
357 return false;
358
359 return true;
360}
361
362u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
363 u16 to_multiplier)
364{
365 struct hci_dev *hdev = conn->hdev;
366 struct hci_conn_params *params;
367 struct hci_cp_le_conn_update cp;
368
369 hci_dev_lock(hdev);
370
371 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
372 if (params) {
373 params->conn_min_interval = min;
374 params->conn_max_interval = max;
375 params->conn_latency = latency;
376 params->supervision_timeout = to_multiplier;
377 }
378
379 hci_dev_unlock(hdev);
380
381 memset(&cp, 0, sizeof(cp));
382 cp.handle = cpu_to_le16(conn->handle);
383 cp.conn_interval_min = cpu_to_le16(min);
384 cp.conn_interval_max = cpu_to_le16(max);
385 cp.conn_latency = cpu_to_le16(latency);
386 cp.supervision_timeout = cpu_to_le16(to_multiplier);
387 cp.min_ce_len = cpu_to_le16(0x0000);
388 cp.max_ce_len = cpu_to_le16(0x0000);
389
390 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
391
392 if (params)
393 return 0x01;
394
395 return 0x00;
396}
397
398void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
399 __u8 ltk[16], __u8 key_size)
400{
401 struct hci_dev *hdev = conn->hdev;
402 struct hci_cp_le_start_enc cp;
403
404 BT_DBG("hcon %p", conn);
405
406 memset(&cp, 0, sizeof(cp));
407
408 cp.handle = cpu_to_le16(conn->handle);
409 cp.rand = rand;
410 cp.ediv = ediv;
411 memcpy(cp.ltk, ltk, key_size);
412
413 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
414}
415
416/* Device _must_ be locked */
417void hci_sco_setup(struct hci_conn *conn, __u8 status)
418{
419 struct hci_conn *sco = conn->link;
420
421 if (!sco)
422 return;
423
424 BT_DBG("hcon %p", conn);
425
426 if (!status) {
427 if (lmp_esco_capable(conn->hdev))
428 hci_setup_sync(sco, conn->handle);
429 else
430 hci_add_sco(sco, conn->handle);
431 } else {
432 hci_connect_cfm(sco, status);
433 hci_conn_del(sco);
434 }
435}
436
437static void hci_conn_timeout(struct work_struct *work)
438{
439 struct hci_conn *conn = container_of(work, struct hci_conn,
440 disc_work.work);
441 int refcnt = atomic_read(&conn->refcnt);
442
443 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
444
445 WARN_ON(refcnt < 0);
446
447 /* FIXME: It was observed that in pairing failed scenario, refcnt
448 * drops below 0. Probably this is because l2cap_conn_del calls
449 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
450 * dropped. After that loop hci_chan_del is called which also drops
451 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
452 * otherwise drop it.
453 */
454 if (refcnt > 0)
455 return;
456
457 /* LE connections in scanning state need special handling */
458 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
459 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
460 hci_connect_le_scan_remove(conn);
461 return;
462 }
463
464 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
465}
466
467/* Enter sniff mode */
468static void hci_conn_idle(struct work_struct *work)
469{
470 struct hci_conn *conn = container_of(work, struct hci_conn,
471 idle_work.work);
472 struct hci_dev *hdev = conn->hdev;
473
474 BT_DBG("hcon %p mode %d", conn, conn->mode);
475
476 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
477 return;
478
479 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
480 return;
481
482 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
483 struct hci_cp_sniff_subrate cp;
484 cp.handle = cpu_to_le16(conn->handle);
485 cp.max_latency = cpu_to_le16(0);
486 cp.min_remote_timeout = cpu_to_le16(0);
487 cp.min_local_timeout = cpu_to_le16(0);
488 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
489 }
490
491 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
492 struct hci_cp_sniff_mode cp;
493 cp.handle = cpu_to_le16(conn->handle);
494 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
495 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
496 cp.attempt = cpu_to_le16(4);
497 cp.timeout = cpu_to_le16(1);
498 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
499 }
500}
501
502static void hci_conn_auto_accept(struct work_struct *work)
503{
504 struct hci_conn *conn = container_of(work, struct hci_conn,
505 auto_accept_work.work);
506
507 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
508 &conn->dst);
509}
510
511static void le_disable_advertising(struct hci_dev *hdev)
512{
513 if (ext_adv_capable(hdev)) {
514 struct hci_cp_le_set_ext_adv_enable cp;
515
516 cp.enable = 0x00;
517 cp.num_of_sets = 0x00;
518
519 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
520 &cp);
521 } else {
522 u8 enable = 0x00;
523 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
524 &enable);
525 }
526}
527
528static void le_conn_timeout(struct work_struct *work)
529{
530 struct hci_conn *conn = container_of(work, struct hci_conn,
531 le_conn_timeout.work);
532 struct hci_dev *hdev = conn->hdev;
533
534 BT_DBG("");
535
536 /* We could end up here due to having done directed advertising,
537 * so clean up the state if necessary. This should however only
538 * happen with broken hardware or if low duty cycle was used
539 * (which doesn't have a timeout of its own).
540 */
541 if (conn->role == HCI_ROLE_SLAVE) {
542 /* Disable LE Advertising */
543 le_disable_advertising(hdev);
544 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
545 return;
546 }
547
548 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
549}
550
551struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
552 u8 role)
553{
554 struct hci_conn *conn;
555
556 BT_DBG("%s dst %pMR", hdev->name, dst);
557
558 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
559 if (!conn)
560 return NULL;
561
562 bacpy(&conn->dst, dst);
563 bacpy(&conn->src, &hdev->bdaddr);
564 conn->hdev = hdev;
565 conn->type = type;
566 conn->role = role;
567 conn->mode = HCI_CM_ACTIVE;
568 conn->state = BT_OPEN;
569 conn->auth_type = HCI_AT_GENERAL_BONDING;
570 conn->io_capability = hdev->io_capability;
571 conn->remote_auth = 0xff;
572 conn->key_type = 0xff;
573 conn->rssi = HCI_RSSI_INVALID;
574 conn->tx_power = HCI_TX_POWER_INVALID;
575 conn->max_tx_power = HCI_TX_POWER_INVALID;
576
577 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
578 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
579
580 /* Set Default Authenticated payload timeout to 30s */
581 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
582
583 if (conn->role == HCI_ROLE_MASTER)
584 conn->out = true;
585
586 switch (type) {
587 case ACL_LINK:
588 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
589 break;
590 case LE_LINK:
591 /* conn->src should reflect the local identity address */
592 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
593 break;
594 case SCO_LINK:
595 if (lmp_esco_capable(hdev))
596 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
597 (hdev->esco_type & EDR_ESCO_MASK);
598 else
599 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
600 break;
601 case ESCO_LINK:
602 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
603 break;
604 }
605
606 skb_queue_head_init(&conn->data_q);
607
608 INIT_LIST_HEAD(&conn->chan_list);
609
610 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
611 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
612 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
613 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
614 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
615
616 atomic_set(&conn->refcnt, 0);
617
618 hci_dev_hold(hdev);
619
620 hci_conn_hash_add(hdev, conn);
621
622 /* The SCO and eSCO connections will only be notified when their
623 * setup has been completed. This is different to ACL links which
624 * can be notified right away.
625 */
626 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
627 if (hdev->notify)
628 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
629 }
630
631 hci_conn_init_sysfs(conn);
632
633 return conn;
634}
635
636int hci_conn_del(struct hci_conn *conn)
637{
638 struct hci_dev *hdev = conn->hdev;
639
640 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
641
642 cancel_delayed_work_sync(&conn->disc_work);
643 cancel_delayed_work_sync(&conn->auto_accept_work);
644 cancel_delayed_work_sync(&conn->idle_work);
645
646 if (conn->type == ACL_LINK) {
647 struct hci_conn *sco = conn->link;
648 if (sco)
649 sco->link = NULL;
650
651 /* Unacked frames */
652 hdev->acl_cnt += conn->sent;
653 } else if (conn->type == LE_LINK) {
654 cancel_delayed_work(&conn->le_conn_timeout);
655
656 if (hdev->le_pkts)
657 hdev->le_cnt += conn->sent;
658 else
659 hdev->acl_cnt += conn->sent;
660 } else {
661 struct hci_conn *acl = conn->link;
662 if (acl) {
663 acl->link = NULL;
664 hci_conn_drop(acl);
665 }
666 }
667
668 if (conn->amp_mgr)
669 amp_mgr_put(conn->amp_mgr);
670
671 skb_queue_purge(&conn->data_q);
672
673 /* Remove the connection from the list and cleanup its remaining
674 * state. This is a separate function since for some cases like
675 * BT_CONNECT_SCAN we *only* want the cleanup part without the
676 * rest of hci_conn_del.
677 */
678 hci_conn_cleanup(conn);
679
680 return 0;
681}
682
683struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
684{
685 int use_src = bacmp(src, BDADDR_ANY);
686 struct hci_dev *hdev = NULL, *d;
687
688 BT_DBG("%pMR -> %pMR", src, dst);
689
690 read_lock(&hci_dev_list_lock);
691
692 list_for_each_entry(d, &hci_dev_list, list) {
693 if (!test_bit(HCI_UP, &d->flags) ||
694 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
695 d->dev_type != HCI_PRIMARY)
696 continue;
697
698 /* Simple routing:
699 * No source address - find interface with bdaddr != dst
700 * Source address - find interface with bdaddr == src
701 */
702
703 if (use_src) {
704 bdaddr_t id_addr;
705 u8 id_addr_type;
706
707 if (src_type == BDADDR_BREDR) {
708 if (!lmp_bredr_capable(d))
709 continue;
710 bacpy(&id_addr, &d->bdaddr);
711 id_addr_type = BDADDR_BREDR;
712 } else {
713 if (!lmp_le_capable(d))
714 continue;
715
716 hci_copy_identity_address(d, &id_addr,
717 &id_addr_type);
718
719 /* Convert from HCI to three-value type */
720 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
721 id_addr_type = BDADDR_LE_PUBLIC;
722 else
723 id_addr_type = BDADDR_LE_RANDOM;
724 }
725
726 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
727 hdev = d; break;
728 }
729 } else {
730 if (bacmp(&d->bdaddr, dst)) {
731 hdev = d; break;
732 }
733 }
734 }
735
736 if (hdev)
737 hdev = hci_dev_hold(hdev);
738
739 read_unlock(&hci_dev_list_lock);
740 return hdev;
741}
742EXPORT_SYMBOL(hci_get_route);
743
744/* This function requires the caller holds hdev->lock */
745void hci_le_conn_failed(struct hci_conn *conn, u8 status)
746{
747 struct hci_dev *hdev = conn->hdev;
748 struct hci_conn_params *params;
749
750 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
751 conn->dst_type);
752 if (params && params->conn) {
753 hci_conn_drop(params->conn);
754 hci_conn_put(params->conn);
755 params->conn = NULL;
756 }
757
758 conn->state = BT_CLOSED;
759
760 /* If the status indicates successful cancellation of
761 * the attempt (i.e. Unknown Connection Id) there's no point of
762 * notifying failure since we'll go back to keep trying to
763 * connect. The only exception is explicit connect requests
764 * where a timeout + cancel does indicate an actual failure.
765 */
766 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
767 (params && params->explicit_connect))
768 mgmt_connect_failed(hdev, &conn->dst, conn->type,
769 conn->dst_type, status);
770
771 hci_connect_cfm(conn, status);
772
773 hci_conn_del(conn);
774
775 /* The suspend notifier is waiting for all devices to disconnect and an
776 * LE connect cancel will result in an hci_le_conn_failed. Once the last
777 * connection is deleted, we should also wake the suspend queue to
778 * complete suspend operations.
779 */
780 if (list_empty(&hdev->conn_hash.list) &&
781 test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
782 wake_up(&hdev->suspend_wait_q);
783 }
784
785 /* Since we may have temporarily stopped the background scanning in
786 * favor of connection establishment, we should restart it.
787 */
788 hci_update_background_scan(hdev);
789
790 /* Re-enable advertising in case this was a failed connection
791 * attempt as a peripheral.
792 */
793 hci_req_reenable_advertising(hdev);
794}
795
796static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
797{
798 struct hci_conn *conn;
799
800 hci_dev_lock(hdev);
801
802 conn = hci_lookup_le_connect(hdev);
803
804 if (hdev->adv_instance_cnt)
805 hci_req_resume_adv_instances(hdev);
806
807 if (!status) {
808 hci_connect_le_scan_cleanup(conn);
809 goto done;
810 }
811
812 bt_dev_err(hdev, "request failed to create LE connection: "
813 "status 0x%2.2x", status);
814
815 if (!conn)
816 goto done;
817
818 hci_le_conn_failed(conn, status);
819
820done:
821 hci_dev_unlock(hdev);
822}
823
824static bool conn_use_rpa(struct hci_conn *conn)
825{
826 struct hci_dev *hdev = conn->hdev;
827
828 return hci_dev_test_flag(hdev, HCI_PRIVACY);
829}
830
831static void set_ext_conn_params(struct hci_conn *conn,
832 struct hci_cp_le_ext_conn_param *p)
833{
834 struct hci_dev *hdev = conn->hdev;
835
836 memset(p, 0, sizeof(*p));
837
838 p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
839 p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
840 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
841 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
842 p->conn_latency = cpu_to_le16(conn->le_conn_latency);
843 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
844 p->min_ce_len = cpu_to_le16(0x0000);
845 p->max_ce_len = cpu_to_le16(0x0000);
846}
847
848static void hci_req_add_le_create_conn(struct hci_request *req,
849 struct hci_conn *conn,
850 bdaddr_t *direct_rpa)
851{
852 struct hci_dev *hdev = conn->hdev;
853 u8 own_addr_type;
854
855 /* If direct address was provided we use it instead of current
856 * address.
857 */
858 if (direct_rpa) {
859 if (bacmp(&req->hdev->random_addr, direct_rpa))
860 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
861 direct_rpa);
862
863 /* direct address is always RPA */
864 own_addr_type = ADDR_LE_DEV_RANDOM;
865 } else {
866 /* Update random address, but set require_privacy to false so
867 * that we never connect with an non-resolvable address.
868 */
869 if (hci_update_random_address(req, false, conn_use_rpa(conn),
870 &own_addr_type))
871 return;
872 }
873
874 if (use_ext_conn(hdev)) {
875 struct hci_cp_le_ext_create_conn *cp;
876 struct hci_cp_le_ext_conn_param *p;
877 u8 data[sizeof(*cp) + sizeof(*p) * 3];
878 u32 plen;
879
880 cp = (void *) data;
881 p = (void *) cp->data;
882
883 memset(cp, 0, sizeof(*cp));
884
885 bacpy(&cp->peer_addr, &conn->dst);
886 cp->peer_addr_type = conn->dst_type;
887 cp->own_addr_type = own_addr_type;
888
889 plen = sizeof(*cp);
890
891 if (scan_1m(hdev)) {
892 cp->phys |= LE_SCAN_PHY_1M;
893 set_ext_conn_params(conn, p);
894
895 p++;
896 plen += sizeof(*p);
897 }
898
899 if (scan_2m(hdev)) {
900 cp->phys |= LE_SCAN_PHY_2M;
901 set_ext_conn_params(conn, p);
902
903 p++;
904 plen += sizeof(*p);
905 }
906
907 if (scan_coded(hdev)) {
908 cp->phys |= LE_SCAN_PHY_CODED;
909 set_ext_conn_params(conn, p);
910
911 plen += sizeof(*p);
912 }
913
914 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
915
916 } else {
917 struct hci_cp_le_create_conn cp;
918
919 memset(&cp, 0, sizeof(cp));
920
921 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
922 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
923
924 bacpy(&cp.peer_addr, &conn->dst);
925 cp.peer_addr_type = conn->dst_type;
926 cp.own_address_type = own_addr_type;
927 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
928 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
929 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
930 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
931 cp.min_ce_len = cpu_to_le16(0x0000);
932 cp.max_ce_len = cpu_to_le16(0x0000);
933
934 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
935 }
936
937 conn->state = BT_CONNECT;
938 clear_bit(HCI_CONN_SCANNING, &conn->flags);
939}
940
941static void hci_req_directed_advertising(struct hci_request *req,
942 struct hci_conn *conn)
943{
944 struct hci_dev *hdev = req->hdev;
945 u8 own_addr_type;
946 u8 enable;
947
948 if (ext_adv_capable(hdev)) {
949 struct hci_cp_le_set_ext_adv_params cp;
950 bdaddr_t random_addr;
951
952 /* Set require_privacy to false so that the remote device has a
953 * chance of identifying us.
954 */
955 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
956 &own_addr_type, &random_addr) < 0)
957 return;
958
959 memset(&cp, 0, sizeof(cp));
960
961 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
962 cp.own_addr_type = own_addr_type;
963 cp.channel_map = hdev->le_adv_channel_map;
964 cp.tx_power = HCI_TX_POWER_INVALID;
965 cp.primary_phy = HCI_ADV_PHY_1M;
966 cp.secondary_phy = HCI_ADV_PHY_1M;
967 cp.handle = 0; /* Use instance 0 for directed adv */
968 cp.own_addr_type = own_addr_type;
969 cp.peer_addr_type = conn->dst_type;
970 bacpy(&cp.peer_addr, &conn->dst);
971
972 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
973 * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
974 * does not supports advertising data when the advertising set already
975 * contains some, the controller shall return erroc code 'Invalid
976 * HCI Command Parameters(0x12).
977 * So it is required to remove adv set for handle 0x00. since we use
978 * instance 0 for directed adv.
979 */
980 __hci_req_remove_ext_adv_instance(req, cp.handle);
981
982 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
983
984 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
985 bacmp(&random_addr, BDADDR_ANY) &&
986 bacmp(&random_addr, &hdev->random_addr)) {
987 struct hci_cp_le_set_adv_set_rand_addr cp;
988
989 memset(&cp, 0, sizeof(cp));
990
991 cp.handle = 0;
992 bacpy(&cp.bdaddr, &random_addr);
993
994 hci_req_add(req,
995 HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
996 sizeof(cp), &cp);
997 }
998
999 __hci_req_enable_ext_advertising(req, 0x00);
1000 } else {
1001 struct hci_cp_le_set_adv_param cp;
1002
1003 /* Clear the HCI_LE_ADV bit temporarily so that the
1004 * hci_update_random_address knows that it's safe to go ahead
1005 * and write a new random address. The flag will be set back on
1006 * as soon as the SET_ADV_ENABLE HCI command completes.
1007 */
1008 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1009
1010 /* Set require_privacy to false so that the remote device has a
1011 * chance of identifying us.
1012 */
1013 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1014 &own_addr_type) < 0)
1015 return;
1016
1017 memset(&cp, 0, sizeof(cp));
1018
1019 /* Some controllers might reject command if intervals are not
1020 * within range for undirected advertising.
1021 * BCM20702A0 is known to be affected by this.
1022 */
1023 cp.min_interval = cpu_to_le16(0x0020);
1024 cp.max_interval = cpu_to_le16(0x0020);
1025
1026 cp.type = LE_ADV_DIRECT_IND;
1027 cp.own_address_type = own_addr_type;
1028 cp.direct_addr_type = conn->dst_type;
1029 bacpy(&cp.direct_addr, &conn->dst);
1030 cp.channel_map = hdev->le_adv_channel_map;
1031
1032 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1033
1034 enable = 0x01;
1035 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1036 &enable);
1037 }
1038
1039 conn->state = BT_CONNECT;
1040}
1041
1042struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1043 u8 dst_type, u8 sec_level, u16 conn_timeout,
1044 u8 role, bdaddr_t *direct_rpa)
1045{
1046 struct hci_conn_params *params;
1047 struct hci_conn *conn;
1048 struct smp_irk *irk;
1049 struct hci_request req;
1050 int err;
1051
1052 /* This ensures that during disable le_scan address resolution
1053 * will not be disabled if it is followed by le_create_conn
1054 */
1055 bool rpa_le_conn = true;
1056
1057 /* Let's make sure that le is enabled.*/
1058 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1059 if (lmp_le_capable(hdev))
1060 return ERR_PTR(-ECONNREFUSED);
1061
1062 return ERR_PTR(-EOPNOTSUPP);
1063 }
1064
1065 /* Since the controller supports only one LE connection attempt at a
1066 * time, we return -EBUSY if there is any connection attempt running.
1067 */
1068 if (hci_lookup_le_connect(hdev))
1069 return ERR_PTR(-EBUSY);
1070
1071 /* If there's already a connection object but it's not in
1072 * scanning state it means it must already be established, in
1073 * which case we can't do anything else except report a failure
1074 * to connect.
1075 */
1076 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1077 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1078 return ERR_PTR(-EBUSY);
1079 }
1080
1081 /* When given an identity address with existing identity
1082 * resolving key, the connection needs to be established
1083 * to a resolvable random address.
1084 *
1085 * Storing the resolvable random address is required here
1086 * to handle connection failures. The address will later
1087 * be resolved back into the original identity address
1088 * from the connect request.
1089 */
1090 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1091 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1092 dst = &irk->rpa;
1093 dst_type = ADDR_LE_DEV_RANDOM;
1094 }
1095
1096 if (conn) {
1097 bacpy(&conn->dst, dst);
1098 } else {
1099 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1100 if (!conn)
1101 return ERR_PTR(-ENOMEM);
1102 hci_conn_hold(conn);
1103 conn->pending_sec_level = sec_level;
1104 }
1105
1106 conn->dst_type = dst_type;
1107 conn->sec_level = BT_SECURITY_LOW;
1108 conn->conn_timeout = conn_timeout;
1109
1110 hci_req_init(&req, hdev);
1111
1112 /* Disable advertising if we're active. For central role
1113 * connections most controllers will refuse to connect if
1114 * advertising is enabled, and for peripheral role connections we
1115 * anyway have to disable it in order to start directed
1116 * advertising. Any registered advertisements will be
1117 * re-enabled after the connection attempt is finished.
1118 */
1119 if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1120 __hci_req_pause_adv_instances(&req);
1121
1122 /* If requested to connect as peripheral use directed advertising */
1123 if (conn->role == HCI_ROLE_SLAVE) {
1124 /* If we're active scanning most controllers are unable
1125 * to initiate advertising. Simply reject the attempt.
1126 */
1127 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1128 hdev->le_scan_type == LE_SCAN_ACTIVE) {
1129 hci_req_purge(&req);
1130 hci_conn_del(conn);
1131 return ERR_PTR(-EBUSY);
1132 }
1133
1134 hci_req_directed_advertising(&req, conn);
1135 goto create_conn;
1136 }
1137
1138 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1139 if (params) {
1140 conn->le_conn_min_interval = params->conn_min_interval;
1141 conn->le_conn_max_interval = params->conn_max_interval;
1142 conn->le_conn_latency = params->conn_latency;
1143 conn->le_supv_timeout = params->supervision_timeout;
1144 } else {
1145 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1146 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1147 conn->le_conn_latency = hdev->le_conn_latency;
1148 conn->le_supv_timeout = hdev->le_supv_timeout;
1149 }
1150
1151 /* If controller is scanning, we stop it since some controllers are
1152 * not able to scan and connect at the same time. Also set the
1153 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1154 * handler for scan disabling knows to set the correct discovery
1155 * state.
1156 */
1157 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1158 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1159 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1160 }
1161
1162 hci_req_add_le_create_conn(&req, conn, direct_rpa);
1163
1164create_conn:
1165 err = hci_req_run(&req, create_le_conn_complete);
1166 if (err) {
1167 hci_conn_del(conn);
1168
1169 if (hdev->adv_instance_cnt)
1170 hci_req_resume_adv_instances(hdev);
1171
1172 return ERR_PTR(err);
1173 }
1174
1175 return conn;
1176}
1177
1178static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1179{
1180 struct hci_conn *conn;
1181
1182 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1183 if (!conn)
1184 return false;
1185
1186 if (conn->state != BT_CONNECTED)
1187 return false;
1188
1189 return true;
1190}
1191
1192/* This function requires the caller holds hdev->lock */
1193static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1194 bdaddr_t *addr, u8 addr_type)
1195{
1196 struct hci_conn_params *params;
1197
1198 if (is_connected(hdev, addr, addr_type))
1199 return -EISCONN;
1200
1201 params = hci_conn_params_lookup(hdev, addr, addr_type);
1202 if (!params) {
1203 params = hci_conn_params_add(hdev, addr, addr_type);
1204 if (!params)
1205 return -ENOMEM;
1206
1207 /* If we created new params, mark them to be deleted in
1208 * hci_connect_le_scan_cleanup. It's different case than
1209 * existing disabled params, those will stay after cleanup.
1210 */
1211 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1212 }
1213
1214 /* We're trying to connect, so make sure params are at pend_le_conns */
1215 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1216 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1217 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1218 list_del_init(¶ms->action);
1219 list_add(¶ms->action, &hdev->pend_le_conns);
1220 }
1221
1222 params->explicit_connect = true;
1223
1224 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1225 params->auto_connect);
1226
1227 return 0;
1228}
1229
1230/* This function requires the caller holds hdev->lock */
1231struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1232 u8 dst_type, u8 sec_level,
1233 u16 conn_timeout,
1234 enum conn_reasons conn_reason)
1235{
1236 struct hci_conn *conn;
1237
1238 /* Let's make sure that le is enabled.*/
1239 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1240 if (lmp_le_capable(hdev))
1241 return ERR_PTR(-ECONNREFUSED);
1242
1243 return ERR_PTR(-EOPNOTSUPP);
1244 }
1245
1246 /* Some devices send ATT messages as soon as the physical link is
1247 * established. To be able to handle these ATT messages, the user-
1248 * space first establishes the connection and then starts the pairing
1249 * process.
1250 *
1251 * So if a hci_conn object already exists for the following connection
1252 * attempt, we simply update pending_sec_level and auth_type fields
1253 * and return the object found.
1254 */
1255 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1256 if (conn) {
1257 if (conn->pending_sec_level < sec_level)
1258 conn->pending_sec_level = sec_level;
1259 goto done;
1260 }
1261
1262 BT_DBG("requesting refresh of dst_addr");
1263
1264 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1265 if (!conn)
1266 return ERR_PTR(-ENOMEM);
1267
1268 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1269 hci_conn_del(conn);
1270 return ERR_PTR(-EBUSY);
1271 }
1272
1273 conn->state = BT_CONNECT;
1274 set_bit(HCI_CONN_SCANNING, &conn->flags);
1275 conn->dst_type = dst_type;
1276 conn->sec_level = BT_SECURITY_LOW;
1277 conn->pending_sec_level = sec_level;
1278 conn->conn_timeout = conn_timeout;
1279 conn->conn_reason = conn_reason;
1280
1281 hci_update_background_scan(hdev);
1282
1283done:
1284 hci_conn_hold(conn);
1285 return conn;
1286}
1287
1288struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1289 u8 sec_level, u8 auth_type,
1290 enum conn_reasons conn_reason)
1291{
1292 struct hci_conn *acl;
1293
1294 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1295 if (lmp_bredr_capable(hdev))
1296 return ERR_PTR(-ECONNREFUSED);
1297
1298 return ERR_PTR(-EOPNOTSUPP);
1299 }
1300
1301 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1302 if (!acl) {
1303 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1304 if (!acl)
1305 return ERR_PTR(-ENOMEM);
1306 }
1307
1308 hci_conn_hold(acl);
1309
1310 acl->conn_reason = conn_reason;
1311 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1312 acl->sec_level = BT_SECURITY_LOW;
1313 acl->pending_sec_level = sec_level;
1314 acl->auth_type = auth_type;
1315 hci_acl_create_connection(acl);
1316 }
1317
1318 return acl;
1319}
1320
1321struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1322 __u16 setting)
1323{
1324 struct hci_conn *acl;
1325 struct hci_conn *sco;
1326
1327 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1328 CONN_REASON_SCO_CONNECT);
1329 if (IS_ERR(acl))
1330 return acl;
1331
1332 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1333 if (!sco) {
1334 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1335 if (!sco) {
1336 hci_conn_drop(acl);
1337 return ERR_PTR(-ENOMEM);
1338 }
1339 }
1340
1341 acl->link = sco;
1342 sco->link = acl;
1343
1344 hci_conn_hold(sco);
1345
1346 sco->setting = setting;
1347
1348 if (acl->state == BT_CONNECTED &&
1349 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1350 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1351 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1352
1353 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1354 /* defer SCO setup until mode change completed */
1355 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1356 return sco;
1357 }
1358
1359 hci_sco_setup(acl, 0x00);
1360 }
1361
1362 return sco;
1363}
1364
1365/* Check link security requirement */
1366int hci_conn_check_link_mode(struct hci_conn *conn)
1367{
1368 BT_DBG("hcon %p", conn);
1369
1370 /* In Secure Connections Only mode, it is required that Secure
1371 * Connections is used and the link is encrypted with AES-CCM
1372 * using a P-256 authenticated combination key.
1373 */
1374 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1375 if (!hci_conn_sc_enabled(conn) ||
1376 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1377 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1378 return 0;
1379 }
1380
1381 /* AES encryption is required for Level 4:
1382 *
1383 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1384 * page 1319:
1385 *
1386 * 128-bit equivalent strength for link and encryption keys
1387 * required using FIPS approved algorithms (E0 not allowed,
1388 * SAFER+ not allowed, and P-192 not allowed; encryption key
1389 * not shortened)
1390 */
1391 if (conn->sec_level == BT_SECURITY_FIPS &&
1392 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1393 bt_dev_err(conn->hdev,
1394 "Invalid security: Missing AES-CCM usage");
1395 return 0;
1396 }
1397
1398 if (hci_conn_ssp_enabled(conn) &&
1399 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1400 return 0;
1401
1402 return 1;
1403}
1404
1405/* Authenticate remote device */
1406static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1407{
1408 BT_DBG("hcon %p", conn);
1409
1410 if (conn->pending_sec_level > sec_level)
1411 sec_level = conn->pending_sec_level;
1412
1413 if (sec_level > conn->sec_level)
1414 conn->pending_sec_level = sec_level;
1415 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1416 return 1;
1417
1418 /* Make sure we preserve an existing MITM requirement*/
1419 auth_type |= (conn->auth_type & 0x01);
1420
1421 conn->auth_type = auth_type;
1422
1423 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1424 struct hci_cp_auth_requested cp;
1425
1426 cp.handle = cpu_to_le16(conn->handle);
1427 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1428 sizeof(cp), &cp);
1429
1430 /* If we're already encrypted set the REAUTH_PEND flag,
1431 * otherwise set the ENCRYPT_PEND.
1432 */
1433 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1434 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1435 else
1436 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1437 }
1438
1439 return 0;
1440}
1441
1442/* Encrypt the link */
1443static void hci_conn_encrypt(struct hci_conn *conn)
1444{
1445 BT_DBG("hcon %p", conn);
1446
1447 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1448 struct hci_cp_set_conn_encrypt cp;
1449 cp.handle = cpu_to_le16(conn->handle);
1450 cp.encrypt = 0x01;
1451 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1452 &cp);
1453 }
1454}
1455
1456/* Enable security */
1457int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1458 bool initiator)
1459{
1460 BT_DBG("hcon %p", conn);
1461
1462 if (conn->type == LE_LINK)
1463 return smp_conn_security(conn, sec_level);
1464
1465 /* For sdp we don't need the link key. */
1466 if (sec_level == BT_SECURITY_SDP)
1467 return 1;
1468
1469 /* For non 2.1 devices and low security level we don't need the link
1470 key. */
1471 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1472 return 1;
1473
1474 /* For other security levels we need the link key. */
1475 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1476 goto auth;
1477
1478 /* An authenticated FIPS approved combination key has sufficient
1479 * security for security level 4. */
1480 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1481 sec_level == BT_SECURITY_FIPS)
1482 goto encrypt;
1483
1484 /* An authenticated combination key has sufficient security for
1485 security level 3. */
1486 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1487 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1488 sec_level == BT_SECURITY_HIGH)
1489 goto encrypt;
1490
1491 /* An unauthenticated combination key has sufficient security for
1492 security level 1 and 2. */
1493 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1494 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1495 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1496 goto encrypt;
1497
1498 /* A combination key has always sufficient security for the security
1499 levels 1 or 2. High security level requires the combination key
1500 is generated using maximum PIN code length (16).
1501 For pre 2.1 units. */
1502 if (conn->key_type == HCI_LK_COMBINATION &&
1503 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1504 conn->pin_length == 16))
1505 goto encrypt;
1506
1507auth:
1508 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1509 return 0;
1510
1511 if (initiator)
1512 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1513
1514 if (!hci_conn_auth(conn, sec_level, auth_type))
1515 return 0;
1516
1517encrypt:
1518 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1519 /* Ensure that the encryption key size has been read,
1520 * otherwise stall the upper layer responses.
1521 */
1522 if (!conn->enc_key_size)
1523 return 0;
1524
1525 /* Nothing else needed, all requirements are met */
1526 return 1;
1527 }
1528
1529 hci_conn_encrypt(conn);
1530 return 0;
1531}
1532EXPORT_SYMBOL(hci_conn_security);
1533
1534/* Check secure link requirement */
1535int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1536{
1537 BT_DBG("hcon %p", conn);
1538
1539 /* Accept if non-secure or higher security level is required */
1540 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1541 return 1;
1542
1543 /* Accept if secure or higher security level is already present */
1544 if (conn->sec_level == BT_SECURITY_HIGH ||
1545 conn->sec_level == BT_SECURITY_FIPS)
1546 return 1;
1547
1548 /* Reject not secure link */
1549 return 0;
1550}
1551EXPORT_SYMBOL(hci_conn_check_secure);
1552
1553/* Switch role */
1554int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1555{
1556 BT_DBG("hcon %p", conn);
1557
1558 if (role == conn->role)
1559 return 1;
1560
1561 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1562 struct hci_cp_switch_role cp;
1563 bacpy(&cp.bdaddr, &conn->dst);
1564 cp.role = role;
1565 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1566 }
1567
1568 return 0;
1569}
1570EXPORT_SYMBOL(hci_conn_switch_role);
1571
1572/* Enter active mode */
1573void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1574{
1575 struct hci_dev *hdev = conn->hdev;
1576
1577 BT_DBG("hcon %p mode %d", conn, conn->mode);
1578
1579 if (conn->mode != HCI_CM_SNIFF)
1580 goto timer;
1581
1582 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1583 goto timer;
1584
1585 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1586 struct hci_cp_exit_sniff_mode cp;
1587 cp.handle = cpu_to_le16(conn->handle);
1588 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1589 }
1590
1591timer:
1592 if (hdev->idle_timeout > 0)
1593 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1594 msecs_to_jiffies(hdev->idle_timeout));
1595}
1596
1597/* Drop all connection on the device */
1598void hci_conn_hash_flush(struct hci_dev *hdev)
1599{
1600 struct hci_conn_hash *h = &hdev->conn_hash;
1601 struct hci_conn *c, *n;
1602
1603 BT_DBG("hdev %s", hdev->name);
1604
1605 list_for_each_entry_safe(c, n, &h->list, list) {
1606 c->state = BT_CLOSED;
1607
1608 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1609 hci_conn_del(c);
1610 }
1611}
1612
1613/* Check pending connect attempts */
1614void hci_conn_check_pending(struct hci_dev *hdev)
1615{
1616 struct hci_conn *conn;
1617
1618 BT_DBG("hdev %s", hdev->name);
1619
1620 hci_dev_lock(hdev);
1621
1622 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1623 if (conn)
1624 hci_acl_create_connection(conn);
1625
1626 hci_dev_unlock(hdev);
1627}
1628
1629static u32 get_link_mode(struct hci_conn *conn)
1630{
1631 u32 link_mode = 0;
1632
1633 if (conn->role == HCI_ROLE_MASTER)
1634 link_mode |= HCI_LM_MASTER;
1635
1636 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1637 link_mode |= HCI_LM_ENCRYPT;
1638
1639 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1640 link_mode |= HCI_LM_AUTH;
1641
1642 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1643 link_mode |= HCI_LM_SECURE;
1644
1645 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1646 link_mode |= HCI_LM_FIPS;
1647
1648 return link_mode;
1649}
1650
1651int hci_get_conn_list(void __user *arg)
1652{
1653 struct hci_conn *c;
1654 struct hci_conn_list_req req, *cl;
1655 struct hci_conn_info *ci;
1656 struct hci_dev *hdev;
1657 int n = 0, size, err;
1658
1659 if (copy_from_user(&req, arg, sizeof(req)))
1660 return -EFAULT;
1661
1662 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1663 return -EINVAL;
1664
1665 size = sizeof(req) + req.conn_num * sizeof(*ci);
1666
1667 cl = kmalloc(size, GFP_KERNEL);
1668 if (!cl)
1669 return -ENOMEM;
1670
1671 hdev = hci_dev_get(req.dev_id);
1672 if (!hdev) {
1673 kfree(cl);
1674 return -ENODEV;
1675 }
1676
1677 ci = cl->conn_info;
1678
1679 hci_dev_lock(hdev);
1680 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1681 bacpy(&(ci + n)->bdaddr, &c->dst);
1682 (ci + n)->handle = c->handle;
1683 (ci + n)->type = c->type;
1684 (ci + n)->out = c->out;
1685 (ci + n)->state = c->state;
1686 (ci + n)->link_mode = get_link_mode(c);
1687 if (++n >= req.conn_num)
1688 break;
1689 }
1690 hci_dev_unlock(hdev);
1691
1692 cl->dev_id = hdev->id;
1693 cl->conn_num = n;
1694 size = sizeof(req) + n * sizeof(*ci);
1695
1696 hci_dev_put(hdev);
1697
1698 err = copy_to_user(arg, cl, size);
1699 kfree(cl);
1700
1701 return err ? -EFAULT : 0;
1702}
1703
1704int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1705{
1706 struct hci_conn_info_req req;
1707 struct hci_conn_info ci;
1708 struct hci_conn *conn;
1709 char __user *ptr = arg + sizeof(req);
1710
1711 if (copy_from_user(&req, arg, sizeof(req)))
1712 return -EFAULT;
1713
1714 hci_dev_lock(hdev);
1715 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1716 if (conn) {
1717 bacpy(&ci.bdaddr, &conn->dst);
1718 ci.handle = conn->handle;
1719 ci.type = conn->type;
1720 ci.out = conn->out;
1721 ci.state = conn->state;
1722 ci.link_mode = get_link_mode(conn);
1723 }
1724 hci_dev_unlock(hdev);
1725
1726 if (!conn)
1727 return -ENOENT;
1728
1729 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1730}
1731
1732int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1733{
1734 struct hci_auth_info_req req;
1735 struct hci_conn *conn;
1736
1737 if (copy_from_user(&req, arg, sizeof(req)))
1738 return -EFAULT;
1739
1740 hci_dev_lock(hdev);
1741 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1742 if (conn)
1743 req.type = conn->auth_type;
1744 hci_dev_unlock(hdev);
1745
1746 if (!conn)
1747 return -ENOENT;
1748
1749 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1750}
1751
1752struct hci_chan *hci_chan_create(struct hci_conn *conn)
1753{
1754 struct hci_dev *hdev = conn->hdev;
1755 struct hci_chan *chan;
1756
1757 BT_DBG("%s hcon %p", hdev->name, conn);
1758
1759 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1760 BT_DBG("Refusing to create new hci_chan");
1761 return NULL;
1762 }
1763
1764 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1765 if (!chan)
1766 return NULL;
1767
1768 chan->conn = hci_conn_get(conn);
1769 skb_queue_head_init(&chan->data_q);
1770 chan->state = BT_CONNECTED;
1771
1772 list_add_rcu(&chan->list, &conn->chan_list);
1773
1774 return chan;
1775}
1776
1777void hci_chan_del(struct hci_chan *chan)
1778{
1779 struct hci_conn *conn = chan->conn;
1780 struct hci_dev *hdev = conn->hdev;
1781
1782 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1783
1784 list_del_rcu(&chan->list);
1785
1786 synchronize_rcu();
1787
1788 /* Prevent new hci_chan's to be created for this hci_conn */
1789 set_bit(HCI_CONN_DROP, &conn->flags);
1790
1791 hci_conn_put(conn);
1792
1793 skb_queue_purge(&chan->data_q);
1794 kfree(chan);
1795}
1796
1797void hci_chan_list_flush(struct hci_conn *conn)
1798{
1799 struct hci_chan *chan, *n;
1800
1801 BT_DBG("hcon %p", conn);
1802
1803 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1804 hci_chan_del(chan);
1805}
1806
1807static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1808 __u16 handle)
1809{
1810 struct hci_chan *hchan;
1811
1812 list_for_each_entry(hchan, &hcon->chan_list, list) {
1813 if (hchan->handle == handle)
1814 return hchan;
1815 }
1816
1817 return NULL;
1818}
1819
1820struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1821{
1822 struct hci_conn_hash *h = &hdev->conn_hash;
1823 struct hci_conn *hcon;
1824 struct hci_chan *hchan = NULL;
1825
1826 rcu_read_lock();
1827
1828 list_for_each_entry_rcu(hcon, &h->list, list) {
1829 hchan = __hci_chan_lookup_handle(hcon, handle);
1830 if (hchan)
1831 break;
1832 }
1833
1834 rcu_read_unlock();
1835
1836 return hchan;
1837}
1838
1839u32 hci_conn_get_phy(struct hci_conn *conn)
1840{
1841 u32 phys = 0;
1842
1843 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1844 * Table 6.2: Packets defined for synchronous, asynchronous, and
1845 * CPB logical transport types.
1846 */
1847 switch (conn->type) {
1848 case SCO_LINK:
1849 /* SCO logical transport (1 Mb/s):
1850 * HV1, HV2, HV3 and DV.
1851 */
1852 phys |= BT_PHY_BR_1M_1SLOT;
1853
1854 break;
1855
1856 case ACL_LINK:
1857 /* ACL logical transport (1 Mb/s) ptt=0:
1858 * DH1, DM3, DH3, DM5 and DH5.
1859 */
1860 phys |= BT_PHY_BR_1M_1SLOT;
1861
1862 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1863 phys |= BT_PHY_BR_1M_3SLOT;
1864
1865 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1866 phys |= BT_PHY_BR_1M_5SLOT;
1867
1868 /* ACL logical transport (2 Mb/s) ptt=1:
1869 * 2-DH1, 2-DH3 and 2-DH5.
1870 */
1871 if (!(conn->pkt_type & HCI_2DH1))
1872 phys |= BT_PHY_EDR_2M_1SLOT;
1873
1874 if (!(conn->pkt_type & HCI_2DH3))
1875 phys |= BT_PHY_EDR_2M_3SLOT;
1876
1877 if (!(conn->pkt_type & HCI_2DH5))
1878 phys |= BT_PHY_EDR_2M_5SLOT;
1879
1880 /* ACL logical transport (3 Mb/s) ptt=1:
1881 * 3-DH1, 3-DH3 and 3-DH5.
1882 */
1883 if (!(conn->pkt_type & HCI_3DH1))
1884 phys |= BT_PHY_EDR_3M_1SLOT;
1885
1886 if (!(conn->pkt_type & HCI_3DH3))
1887 phys |= BT_PHY_EDR_3M_3SLOT;
1888
1889 if (!(conn->pkt_type & HCI_3DH5))
1890 phys |= BT_PHY_EDR_3M_5SLOT;
1891
1892 break;
1893
1894 case ESCO_LINK:
1895 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1896 phys |= BT_PHY_BR_1M_1SLOT;
1897
1898 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1899 phys |= BT_PHY_BR_1M_3SLOT;
1900
1901 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1902 if (!(conn->pkt_type & ESCO_2EV3))
1903 phys |= BT_PHY_EDR_2M_1SLOT;
1904
1905 if (!(conn->pkt_type & ESCO_2EV5))
1906 phys |= BT_PHY_EDR_2M_3SLOT;
1907
1908 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1909 if (!(conn->pkt_type & ESCO_3EV3))
1910 phys |= BT_PHY_EDR_3M_1SLOT;
1911
1912 if (!(conn->pkt_type & ESCO_3EV5))
1913 phys |= BT_PHY_EDR_3M_3SLOT;
1914
1915 break;
1916
1917 case LE_LINK:
1918 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1919 phys |= BT_PHY_LE_1M_TX;
1920
1921 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1922 phys |= BT_PHY_LE_1M_RX;
1923
1924 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1925 phys |= BT_PHY_LE_2M_TX;
1926
1927 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1928 phys |= BT_PHY_LE_2M_RX;
1929
1930 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
1931 phys |= BT_PHY_LE_CODED_TX;
1932
1933 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
1934 phys |= BT_PHY_LE_CODED_RX;
1935
1936 break;
1937 }
1938
1939 return phys;
1940}