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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 2023-2024 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 "smp.h"
38#include "eir.h"
39
40struct sco_param {
41 u16 pkt_type;
42 u16 max_latency;
43 u8 retrans_effort;
44};
45
46struct conn_handle_t {
47 struct hci_conn *conn;
48 __u16 handle;
49};
50
51static const struct sco_param esco_param_cvsd[] = {
52 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
53 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
54 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
55 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
56 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
57};
58
59static const struct sco_param sco_param_cvsd[] = {
60 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
61 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
62};
63
64static const struct sco_param esco_param_msbc[] = {
65 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
66 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
67};
68
69/* This function requires the caller holds hdev->lock */
70void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
71{
72 struct hci_conn_params *params;
73 struct hci_dev *hdev = conn->hdev;
74 struct smp_irk *irk;
75 bdaddr_t *bdaddr;
76 u8 bdaddr_type;
77
78 bdaddr = &conn->dst;
79 bdaddr_type = conn->dst_type;
80
81 /* Check if we need to convert to identity address */
82 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
83 if (irk) {
84 bdaddr = &irk->bdaddr;
85 bdaddr_type = irk->addr_type;
86 }
87
88 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
89 bdaddr_type);
90 if (!params)
91 return;
92
93 if (params->conn) {
94 hci_conn_drop(params->conn);
95 hci_conn_put(params->conn);
96 params->conn = NULL;
97 }
98
99 if (!params->explicit_connect)
100 return;
101
102 /* If the status indicates successful cancellation of
103 * the attempt (i.e. Unknown Connection Id) there's no point of
104 * notifying failure since we'll go back to keep trying to
105 * connect. The only exception is explicit connect requests
106 * where a timeout + cancel does indicate an actual failure.
107 */
108 if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
109 mgmt_connect_failed(hdev, conn, status);
110
111 /* The connection attempt was doing scan for new RPA, and is
112 * in scan phase. If params are not associated with any other
113 * autoconnect action, remove them completely. If they are, just unmark
114 * them as waiting for connection, by clearing explicit_connect field.
115 */
116 params->explicit_connect = false;
117
118 hci_pend_le_list_del_init(params);
119
120 switch (params->auto_connect) {
121 case HCI_AUTO_CONN_EXPLICIT:
122 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
123 /* return instead of break to avoid duplicate scan update */
124 return;
125 case HCI_AUTO_CONN_DIRECT:
126 case HCI_AUTO_CONN_ALWAYS:
127 hci_pend_le_list_add(params, &hdev->pend_le_conns);
128 break;
129 case HCI_AUTO_CONN_REPORT:
130 hci_pend_le_list_add(params, &hdev->pend_le_reports);
131 break;
132 default:
133 break;
134 }
135
136 hci_update_passive_scan(hdev);
137}
138
139static void hci_conn_cleanup(struct hci_conn *conn)
140{
141 struct hci_dev *hdev = conn->hdev;
142
143 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
144 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
145
146 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
147 hci_remove_link_key(hdev, &conn->dst);
148
149 hci_chan_list_flush(conn);
150
151 hci_conn_hash_del(hdev, conn);
152
153 if (HCI_CONN_HANDLE_UNSET(conn->handle))
154 ida_free(&hdev->unset_handle_ida, conn->handle);
155
156 if (conn->cleanup)
157 conn->cleanup(conn);
158
159 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
160 switch (conn->setting & SCO_AIRMODE_MASK) {
161 case SCO_AIRMODE_CVSD:
162 case SCO_AIRMODE_TRANSP:
163 if (hdev->notify)
164 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
165 break;
166 }
167 } else {
168 if (hdev->notify)
169 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
170 }
171
172 debugfs_remove_recursive(conn->debugfs);
173
174 hci_conn_del_sysfs(conn);
175
176 hci_dev_put(hdev);
177}
178
179int hci_disconnect(struct hci_conn *conn, __u8 reason)
180{
181 BT_DBG("hcon %p", conn);
182
183 /* When we are central of an established connection and it enters
184 * the disconnect timeout, then go ahead and try to read the
185 * current clock offset. Processing of the result is done
186 * within the event handling and hci_clock_offset_evt function.
187 */
188 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
189 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
190 struct hci_dev *hdev = conn->hdev;
191 struct hci_cp_read_clock_offset clkoff_cp;
192
193 clkoff_cp.handle = cpu_to_le16(conn->handle);
194 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
195 &clkoff_cp);
196 }
197
198 return hci_abort_conn(conn, reason);
199}
200
201static void hci_add_sco(struct hci_conn *conn, __u16 handle)
202{
203 struct hci_dev *hdev = conn->hdev;
204 struct hci_cp_add_sco cp;
205
206 BT_DBG("hcon %p", conn);
207
208 conn->state = BT_CONNECT;
209 conn->out = true;
210
211 conn->attempt++;
212
213 cp.handle = cpu_to_le16(handle);
214 cp.pkt_type = cpu_to_le16(conn->pkt_type);
215
216 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
217}
218
219static bool find_next_esco_param(struct hci_conn *conn,
220 const struct sco_param *esco_param, int size)
221{
222 if (!conn->parent)
223 return false;
224
225 for (; conn->attempt <= size; conn->attempt++) {
226 if (lmp_esco_2m_capable(conn->parent) ||
227 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
228 break;
229 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
230 conn, conn->attempt);
231 }
232
233 return conn->attempt <= size;
234}
235
236static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
237{
238 int err;
239 __u8 vnd_len, *vnd_data = NULL;
240 struct hci_op_configure_data_path *cmd = NULL;
241
242 /* Do not take below 2 checks as error since the 1st means user do not
243 * want to use HFP offload mode and the 2nd means the vendor controller
244 * do not need to send below HCI command for offload mode.
245 */
246 if (!codec->data_path || !hdev->get_codec_config_data)
247 return 0;
248
249 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
250 &vnd_data);
251 if (err < 0)
252 goto error;
253
254 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
255 if (!cmd) {
256 err = -ENOMEM;
257 goto error;
258 }
259
260 err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
261 if (err < 0)
262 goto error;
263
264 cmd->vnd_len = vnd_len;
265 memcpy(cmd->vnd_data, vnd_data, vnd_len);
266
267 cmd->direction = 0x00;
268 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
269 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
270
271 cmd->direction = 0x01;
272 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
273 sizeof(*cmd) + vnd_len, cmd,
274 HCI_CMD_TIMEOUT);
275error:
276
277 kfree(cmd);
278 kfree(vnd_data);
279 return err;
280}
281
282static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
283{
284 struct conn_handle_t *conn_handle = data;
285 struct hci_conn *conn = conn_handle->conn;
286 __u16 handle = conn_handle->handle;
287 struct hci_cp_enhanced_setup_sync_conn cp;
288 const struct sco_param *param;
289
290 kfree(conn_handle);
291
292 if (!hci_conn_valid(hdev, conn))
293 return -ECANCELED;
294
295 bt_dev_dbg(hdev, "hcon %p", conn);
296
297 configure_datapath_sync(hdev, &conn->codec);
298
299 conn->state = BT_CONNECT;
300 conn->out = true;
301
302 conn->attempt++;
303
304 memset(&cp, 0x00, sizeof(cp));
305
306 cp.handle = cpu_to_le16(handle);
307
308 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
309 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
310
311 switch (conn->codec.id) {
312 case BT_CODEC_MSBC:
313 if (!find_next_esco_param(conn, esco_param_msbc,
314 ARRAY_SIZE(esco_param_msbc)))
315 return -EINVAL;
316
317 param = &esco_param_msbc[conn->attempt - 1];
318 cp.tx_coding_format.id = 0x05;
319 cp.rx_coding_format.id = 0x05;
320 cp.tx_codec_frame_size = __cpu_to_le16(60);
321 cp.rx_codec_frame_size = __cpu_to_le16(60);
322 cp.in_bandwidth = __cpu_to_le32(32000);
323 cp.out_bandwidth = __cpu_to_le32(32000);
324 cp.in_coding_format.id = 0x04;
325 cp.out_coding_format.id = 0x04;
326 cp.in_coded_data_size = __cpu_to_le16(16);
327 cp.out_coded_data_size = __cpu_to_le16(16);
328 cp.in_pcm_data_format = 2;
329 cp.out_pcm_data_format = 2;
330 cp.in_pcm_sample_payload_msb_pos = 0;
331 cp.out_pcm_sample_payload_msb_pos = 0;
332 cp.in_data_path = conn->codec.data_path;
333 cp.out_data_path = conn->codec.data_path;
334 cp.in_transport_unit_size = 1;
335 cp.out_transport_unit_size = 1;
336 break;
337
338 case BT_CODEC_TRANSPARENT:
339 if (!find_next_esco_param(conn, esco_param_msbc,
340 ARRAY_SIZE(esco_param_msbc)))
341 return false;
342 param = &esco_param_msbc[conn->attempt - 1];
343 cp.tx_coding_format.id = 0x03;
344 cp.rx_coding_format.id = 0x03;
345 cp.tx_codec_frame_size = __cpu_to_le16(60);
346 cp.rx_codec_frame_size = __cpu_to_le16(60);
347 cp.in_bandwidth = __cpu_to_le32(0x1f40);
348 cp.out_bandwidth = __cpu_to_le32(0x1f40);
349 cp.in_coding_format.id = 0x03;
350 cp.out_coding_format.id = 0x03;
351 cp.in_coded_data_size = __cpu_to_le16(16);
352 cp.out_coded_data_size = __cpu_to_le16(16);
353 cp.in_pcm_data_format = 2;
354 cp.out_pcm_data_format = 2;
355 cp.in_pcm_sample_payload_msb_pos = 0;
356 cp.out_pcm_sample_payload_msb_pos = 0;
357 cp.in_data_path = conn->codec.data_path;
358 cp.out_data_path = conn->codec.data_path;
359 cp.in_transport_unit_size = 1;
360 cp.out_transport_unit_size = 1;
361 break;
362
363 case BT_CODEC_CVSD:
364 if (conn->parent && lmp_esco_capable(conn->parent)) {
365 if (!find_next_esco_param(conn, esco_param_cvsd,
366 ARRAY_SIZE(esco_param_cvsd)))
367 return -EINVAL;
368 param = &esco_param_cvsd[conn->attempt - 1];
369 } else {
370 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
371 return -EINVAL;
372 param = &sco_param_cvsd[conn->attempt - 1];
373 }
374 cp.tx_coding_format.id = 2;
375 cp.rx_coding_format.id = 2;
376 cp.tx_codec_frame_size = __cpu_to_le16(60);
377 cp.rx_codec_frame_size = __cpu_to_le16(60);
378 cp.in_bandwidth = __cpu_to_le32(16000);
379 cp.out_bandwidth = __cpu_to_le32(16000);
380 cp.in_coding_format.id = 4;
381 cp.out_coding_format.id = 4;
382 cp.in_coded_data_size = __cpu_to_le16(16);
383 cp.out_coded_data_size = __cpu_to_le16(16);
384 cp.in_pcm_data_format = 2;
385 cp.out_pcm_data_format = 2;
386 cp.in_pcm_sample_payload_msb_pos = 0;
387 cp.out_pcm_sample_payload_msb_pos = 0;
388 cp.in_data_path = conn->codec.data_path;
389 cp.out_data_path = conn->codec.data_path;
390 cp.in_transport_unit_size = 16;
391 cp.out_transport_unit_size = 16;
392 break;
393 default:
394 return -EINVAL;
395 }
396
397 cp.retrans_effort = param->retrans_effort;
398 cp.pkt_type = __cpu_to_le16(param->pkt_type);
399 cp.max_latency = __cpu_to_le16(param->max_latency);
400
401 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
402 return -EIO;
403
404 return 0;
405}
406
407static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
408{
409 struct hci_dev *hdev = conn->hdev;
410 struct hci_cp_setup_sync_conn cp;
411 const struct sco_param *param;
412
413 bt_dev_dbg(hdev, "hcon %p", conn);
414
415 conn->state = BT_CONNECT;
416 conn->out = true;
417
418 conn->attempt++;
419
420 cp.handle = cpu_to_le16(handle);
421
422 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
423 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
424 cp.voice_setting = cpu_to_le16(conn->setting);
425
426 switch (conn->setting & SCO_AIRMODE_MASK) {
427 case SCO_AIRMODE_TRANSP:
428 if (!find_next_esco_param(conn, esco_param_msbc,
429 ARRAY_SIZE(esco_param_msbc)))
430 return false;
431 param = &esco_param_msbc[conn->attempt - 1];
432 break;
433 case SCO_AIRMODE_CVSD:
434 if (conn->parent && lmp_esco_capable(conn->parent)) {
435 if (!find_next_esco_param(conn, esco_param_cvsd,
436 ARRAY_SIZE(esco_param_cvsd)))
437 return false;
438 param = &esco_param_cvsd[conn->attempt - 1];
439 } else {
440 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
441 return false;
442 param = &sco_param_cvsd[conn->attempt - 1];
443 }
444 break;
445 default:
446 return false;
447 }
448
449 cp.retrans_effort = param->retrans_effort;
450 cp.pkt_type = __cpu_to_le16(param->pkt_type);
451 cp.max_latency = __cpu_to_le16(param->max_latency);
452
453 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
454 return false;
455
456 return true;
457}
458
459bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
460{
461 int result;
462 struct conn_handle_t *conn_handle;
463
464 if (enhanced_sync_conn_capable(conn->hdev)) {
465 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
466
467 if (!conn_handle)
468 return false;
469
470 conn_handle->conn = conn;
471 conn_handle->handle = handle;
472 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
473 conn_handle, NULL);
474 if (result < 0)
475 kfree(conn_handle);
476
477 return result == 0;
478 }
479
480 return hci_setup_sync_conn(conn, handle);
481}
482
483u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
484 u16 to_multiplier)
485{
486 struct hci_dev *hdev = conn->hdev;
487 struct hci_conn_params *params;
488 struct hci_cp_le_conn_update cp;
489
490 hci_dev_lock(hdev);
491
492 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
493 if (params) {
494 params->conn_min_interval = min;
495 params->conn_max_interval = max;
496 params->conn_latency = latency;
497 params->supervision_timeout = to_multiplier;
498 }
499
500 hci_dev_unlock(hdev);
501
502 memset(&cp, 0, sizeof(cp));
503 cp.handle = cpu_to_le16(conn->handle);
504 cp.conn_interval_min = cpu_to_le16(min);
505 cp.conn_interval_max = cpu_to_le16(max);
506 cp.conn_latency = cpu_to_le16(latency);
507 cp.supervision_timeout = cpu_to_le16(to_multiplier);
508 cp.min_ce_len = cpu_to_le16(0x0000);
509 cp.max_ce_len = cpu_to_le16(0x0000);
510
511 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
512
513 if (params)
514 return 0x01;
515
516 return 0x00;
517}
518
519void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
520 __u8 ltk[16], __u8 key_size)
521{
522 struct hci_dev *hdev = conn->hdev;
523 struct hci_cp_le_start_enc cp;
524
525 BT_DBG("hcon %p", conn);
526
527 memset(&cp, 0, sizeof(cp));
528
529 cp.handle = cpu_to_le16(conn->handle);
530 cp.rand = rand;
531 cp.ediv = ediv;
532 memcpy(cp.ltk, ltk, key_size);
533
534 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
535}
536
537/* Device _must_ be locked */
538void hci_sco_setup(struct hci_conn *conn, __u8 status)
539{
540 struct hci_link *link;
541
542 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
543 if (!link || !link->conn)
544 return;
545
546 BT_DBG("hcon %p", conn);
547
548 if (!status) {
549 if (lmp_esco_capable(conn->hdev))
550 hci_setup_sync(link->conn, conn->handle);
551 else
552 hci_add_sco(link->conn, conn->handle);
553 } else {
554 hci_connect_cfm(link->conn, status);
555 hci_conn_del(link->conn);
556 }
557}
558
559static void hci_conn_timeout(struct work_struct *work)
560{
561 struct hci_conn *conn = container_of(work, struct hci_conn,
562 disc_work.work);
563 int refcnt = atomic_read(&conn->refcnt);
564
565 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
566
567 WARN_ON(refcnt < 0);
568
569 /* FIXME: It was observed that in pairing failed scenario, refcnt
570 * drops below 0. Probably this is because l2cap_conn_del calls
571 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
572 * dropped. After that loop hci_chan_del is called which also drops
573 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
574 * otherwise drop it.
575 */
576 if (refcnt > 0)
577 return;
578
579 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
580}
581
582/* Enter sniff mode */
583static void hci_conn_idle(struct work_struct *work)
584{
585 struct hci_conn *conn = container_of(work, struct hci_conn,
586 idle_work.work);
587 struct hci_dev *hdev = conn->hdev;
588
589 BT_DBG("hcon %p mode %d", conn, conn->mode);
590
591 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
592 return;
593
594 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
595 return;
596
597 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
598 struct hci_cp_sniff_subrate cp;
599 cp.handle = cpu_to_le16(conn->handle);
600 cp.max_latency = cpu_to_le16(0);
601 cp.min_remote_timeout = cpu_to_le16(0);
602 cp.min_local_timeout = cpu_to_le16(0);
603 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
604 }
605
606 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
607 struct hci_cp_sniff_mode cp;
608 cp.handle = cpu_to_le16(conn->handle);
609 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
610 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
611 cp.attempt = cpu_to_le16(4);
612 cp.timeout = cpu_to_le16(1);
613 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
614 }
615}
616
617static void hci_conn_auto_accept(struct work_struct *work)
618{
619 struct hci_conn *conn = container_of(work, struct hci_conn,
620 auto_accept_work.work);
621
622 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
623 &conn->dst);
624}
625
626static void le_disable_advertising(struct hci_dev *hdev)
627{
628 if (ext_adv_capable(hdev)) {
629 struct hci_cp_le_set_ext_adv_enable cp;
630
631 cp.enable = 0x00;
632 cp.num_of_sets = 0x00;
633
634 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
635 &cp);
636 } else {
637 u8 enable = 0x00;
638 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
639 &enable);
640 }
641}
642
643static void le_conn_timeout(struct work_struct *work)
644{
645 struct hci_conn *conn = container_of(work, struct hci_conn,
646 le_conn_timeout.work);
647 struct hci_dev *hdev = conn->hdev;
648
649 BT_DBG("");
650
651 /* We could end up here due to having done directed advertising,
652 * so clean up the state if necessary. This should however only
653 * happen with broken hardware or if low duty cycle was used
654 * (which doesn't have a timeout of its own).
655 */
656 if (conn->role == HCI_ROLE_SLAVE) {
657 /* Disable LE Advertising */
658 le_disable_advertising(hdev);
659 hci_dev_lock(hdev);
660 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
661 hci_dev_unlock(hdev);
662 return;
663 }
664
665 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
666}
667
668struct iso_list_data {
669 union {
670 u8 cig;
671 u8 big;
672 };
673 union {
674 u8 cis;
675 u8 bis;
676 u16 sync_handle;
677 };
678 int count;
679 bool big_term;
680 bool pa_sync_term;
681 bool big_sync_term;
682};
683
684static void bis_list(struct hci_conn *conn, void *data)
685{
686 struct iso_list_data *d = data;
687
688 /* Skip if not broadcast/ANY address */
689 if (bacmp(&conn->dst, BDADDR_ANY))
690 return;
691
692 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
693 d->bis != conn->iso_qos.bcast.bis)
694 return;
695
696 d->count++;
697}
698
699static int terminate_big_sync(struct hci_dev *hdev, void *data)
700{
701 struct iso_list_data *d = data;
702
703 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
704
705 hci_disable_per_advertising_sync(hdev, d->bis);
706 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
707
708 /* Only terminate BIG if it has been created */
709 if (!d->big_term)
710 return 0;
711
712 return hci_le_terminate_big_sync(hdev, d->big,
713 HCI_ERROR_LOCAL_HOST_TERM);
714}
715
716static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
717{
718 kfree(data);
719}
720
721static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
722{
723 struct iso_list_data *d;
724 int ret;
725
726 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
727 conn->iso_qos.bcast.bis);
728
729 d = kzalloc(sizeof(*d), GFP_KERNEL);
730 if (!d)
731 return -ENOMEM;
732
733 d->big = conn->iso_qos.bcast.big;
734 d->bis = conn->iso_qos.bcast.bis;
735 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
736
737 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
738 terminate_big_destroy);
739 if (ret)
740 kfree(d);
741
742 return ret;
743}
744
745static int big_terminate_sync(struct hci_dev *hdev, void *data)
746{
747 struct iso_list_data *d = data;
748
749 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
750 d->sync_handle);
751
752 if (d->big_sync_term)
753 hci_le_big_terminate_sync(hdev, d->big);
754
755 if (d->pa_sync_term)
756 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
757
758 return 0;
759}
760
761static void find_bis(struct hci_conn *conn, void *data)
762{
763 struct iso_list_data *d = data;
764
765 /* Ignore if BIG doesn't match */
766 if (d->big != conn->iso_qos.bcast.big)
767 return;
768
769 d->count++;
770}
771
772static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
773{
774 struct iso_list_data *d;
775 int ret;
776
777 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
778
779 d = kzalloc(sizeof(*d), GFP_KERNEL);
780 if (!d)
781 return -ENOMEM;
782
783 d->big = big;
784 d->sync_handle = conn->sync_handle;
785
786 if (test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
787 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
788 HCI_CONN_PA_SYNC, d);
789
790 if (!d->count)
791 d->pa_sync_term = true;
792
793 d->count = 0;
794 }
795
796 if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) {
797 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
798 HCI_CONN_BIG_SYNC, d);
799
800 if (!d->count)
801 d->big_sync_term = true;
802 }
803
804 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
805 terminate_big_destroy);
806 if (ret)
807 kfree(d);
808
809 return ret;
810}
811
812/* Cleanup BIS connection
813 *
814 * Detects if there any BIS left connected in a BIG
815 * broadcaster: Remove advertising instance and terminate BIG.
816 * broadcaster receiver: Teminate BIG sync and terminate PA sync.
817 */
818static void bis_cleanup(struct hci_conn *conn)
819{
820 struct hci_dev *hdev = conn->hdev;
821 struct hci_conn *bis;
822
823 bt_dev_dbg(hdev, "conn %p", conn);
824
825 if (conn->role == HCI_ROLE_MASTER) {
826 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
827 return;
828
829 /* Check if ISO connection is a BIS and terminate advertising
830 * set and BIG if there are no other connections using it.
831 */
832 bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big);
833 if (bis)
834 return;
835
836 hci_le_terminate_big(hdev, conn);
837 } else {
838 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
839 conn);
840 }
841}
842
843static int remove_cig_sync(struct hci_dev *hdev, void *data)
844{
845 u8 handle = PTR_UINT(data);
846
847 return hci_le_remove_cig_sync(hdev, handle);
848}
849
850static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
851{
852 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
853
854 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
855 NULL);
856}
857
858static void find_cis(struct hci_conn *conn, void *data)
859{
860 struct iso_list_data *d = data;
861
862 /* Ignore broadcast or if CIG don't match */
863 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
864 return;
865
866 d->count++;
867}
868
869/* Cleanup CIS connection:
870 *
871 * Detects if there any CIS left connected in a CIG and remove it.
872 */
873static void cis_cleanup(struct hci_conn *conn)
874{
875 struct hci_dev *hdev = conn->hdev;
876 struct iso_list_data d;
877
878 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
879 return;
880
881 memset(&d, 0, sizeof(d));
882 d.cig = conn->iso_qos.ucast.cig;
883
884 /* Check if ISO connection is a CIS and remove CIG if there are
885 * no other connections using it.
886 */
887 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_BOUND, &d);
888 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECT, &d);
889 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
890 if (d.count)
891 return;
892
893 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
894}
895
896static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
897{
898 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
899 U16_MAX, GFP_ATOMIC);
900}
901
902static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
903 u8 role, u16 handle)
904{
905 struct hci_conn *conn;
906
907 switch (type) {
908 case ACL_LINK:
909 if (!hdev->acl_mtu)
910 return ERR_PTR(-ECONNREFUSED);
911 break;
912 case ISO_LINK:
913 if (hdev->iso_mtu)
914 /* Dedicated ISO Buffer exists */
915 break;
916 fallthrough;
917 case LE_LINK:
918 if (hdev->le_mtu && hdev->le_mtu < HCI_MIN_LE_MTU)
919 return ERR_PTR(-ECONNREFUSED);
920 if (!hdev->le_mtu && hdev->acl_mtu < HCI_MIN_LE_MTU)
921 return ERR_PTR(-ECONNREFUSED);
922 break;
923 case SCO_LINK:
924 case ESCO_LINK:
925 if (!hdev->sco_pkts)
926 /* Controller does not support SCO or eSCO over HCI */
927 return ERR_PTR(-ECONNREFUSED);
928 break;
929 default:
930 return ERR_PTR(-ECONNREFUSED);
931 }
932
933 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
934
935 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
936 if (!conn)
937 return ERR_PTR(-ENOMEM);
938
939 bacpy(&conn->dst, dst);
940 bacpy(&conn->src, &hdev->bdaddr);
941 conn->handle = handle;
942 conn->hdev = hdev;
943 conn->type = type;
944 conn->role = role;
945 conn->mode = HCI_CM_ACTIVE;
946 conn->state = BT_OPEN;
947 conn->auth_type = HCI_AT_GENERAL_BONDING;
948 conn->io_capability = hdev->io_capability;
949 conn->remote_auth = 0xff;
950 conn->key_type = 0xff;
951 conn->rssi = HCI_RSSI_INVALID;
952 conn->tx_power = HCI_TX_POWER_INVALID;
953 conn->max_tx_power = HCI_TX_POWER_INVALID;
954 conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
955 conn->sid = HCI_SID_INVALID;
956
957 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
958 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
959
960 /* Set Default Authenticated payload timeout to 30s */
961 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
962
963 if (conn->role == HCI_ROLE_MASTER)
964 conn->out = true;
965
966 switch (type) {
967 case ACL_LINK:
968 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
969 conn->mtu = hdev->acl_mtu;
970 break;
971 case LE_LINK:
972 /* conn->src should reflect the local identity address */
973 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
974 conn->mtu = hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
975 break;
976 case ISO_LINK:
977 /* conn->src should reflect the local identity address */
978 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
979
980 /* set proper cleanup function */
981 if (!bacmp(dst, BDADDR_ANY))
982 conn->cleanup = bis_cleanup;
983 else if (conn->role == HCI_ROLE_MASTER)
984 conn->cleanup = cis_cleanup;
985
986 conn->mtu = hdev->iso_mtu ? hdev->iso_mtu :
987 hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
988 break;
989 case SCO_LINK:
990 if (lmp_esco_capable(hdev))
991 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
992 (hdev->esco_type & EDR_ESCO_MASK);
993 else
994 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
995
996 conn->mtu = hdev->sco_mtu;
997 break;
998 case ESCO_LINK:
999 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1000 conn->mtu = hdev->sco_mtu;
1001 break;
1002 }
1003
1004 skb_queue_head_init(&conn->data_q);
1005
1006 INIT_LIST_HEAD(&conn->chan_list);
1007 INIT_LIST_HEAD(&conn->link_list);
1008
1009 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1010 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1011 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1012 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1013
1014 atomic_set(&conn->refcnt, 0);
1015
1016 hci_dev_hold(hdev);
1017
1018 hci_conn_hash_add(hdev, conn);
1019
1020 /* The SCO and eSCO connections will only be notified when their
1021 * setup has been completed. This is different to ACL links which
1022 * can be notified right away.
1023 */
1024 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1025 if (hdev->notify)
1026 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1027 }
1028
1029 hci_conn_init_sysfs(conn);
1030
1031 return conn;
1032}
1033
1034struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1035 bdaddr_t *dst, u8 role)
1036{
1037 int handle;
1038
1039 bt_dev_dbg(hdev, "dst %pMR", dst);
1040
1041 handle = hci_conn_hash_alloc_unset(hdev);
1042 if (unlikely(handle < 0))
1043 return ERR_PTR(-ECONNREFUSED);
1044
1045 return __hci_conn_add(hdev, type, dst, role, handle);
1046}
1047
1048struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
1049 u8 role, u16 handle)
1050{
1051 if (handle > HCI_CONN_HANDLE_MAX)
1052 return ERR_PTR(-EINVAL);
1053
1054 return __hci_conn_add(hdev, type, dst, role, handle);
1055}
1056
1057static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1058{
1059 if (!reason)
1060 reason = HCI_ERROR_REMOTE_USER_TERM;
1061
1062 /* Due to race, SCO/ISO conn might be not established yet at this point,
1063 * and nothing else will clean it up. In other cases it is done via HCI
1064 * events.
1065 */
1066 switch (conn->type) {
1067 case SCO_LINK:
1068 case ESCO_LINK:
1069 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1070 hci_conn_failed(conn, reason);
1071 break;
1072 case ISO_LINK:
1073 if ((conn->state != BT_CONNECTED &&
1074 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) ||
1075 test_bit(HCI_CONN_BIG_CREATED, &conn->flags))
1076 hci_conn_failed(conn, reason);
1077 break;
1078 }
1079}
1080
1081static void hci_conn_unlink(struct hci_conn *conn)
1082{
1083 struct hci_dev *hdev = conn->hdev;
1084
1085 bt_dev_dbg(hdev, "hcon %p", conn);
1086
1087 if (!conn->parent) {
1088 struct hci_link *link, *t;
1089
1090 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1091 struct hci_conn *child = link->conn;
1092
1093 hci_conn_unlink(child);
1094
1095 /* If hdev is down it means
1096 * hci_dev_close_sync/hci_conn_hash_flush is in progress
1097 * and links don't need to be cleanup as all connections
1098 * would be cleanup.
1099 */
1100 if (!test_bit(HCI_UP, &hdev->flags))
1101 continue;
1102
1103 hci_conn_cleanup_child(child, conn->abort_reason);
1104 }
1105
1106 return;
1107 }
1108
1109 if (!conn->link)
1110 return;
1111
1112 list_del_rcu(&conn->link->list);
1113 synchronize_rcu();
1114
1115 hci_conn_drop(conn->parent);
1116 hci_conn_put(conn->parent);
1117 conn->parent = NULL;
1118
1119 kfree(conn->link);
1120 conn->link = NULL;
1121}
1122
1123void hci_conn_del(struct hci_conn *conn)
1124{
1125 struct hci_dev *hdev = conn->hdev;
1126
1127 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1128
1129 hci_conn_unlink(conn);
1130
1131 disable_delayed_work_sync(&conn->disc_work);
1132 disable_delayed_work_sync(&conn->auto_accept_work);
1133 disable_delayed_work_sync(&conn->idle_work);
1134
1135 if (conn->type == ACL_LINK) {
1136 /* Unacked frames */
1137 hdev->acl_cnt += conn->sent;
1138 } else if (conn->type == LE_LINK) {
1139 cancel_delayed_work(&conn->le_conn_timeout);
1140
1141 if (hdev->le_pkts)
1142 hdev->le_cnt += conn->sent;
1143 else
1144 hdev->acl_cnt += conn->sent;
1145 } else {
1146 /* Unacked ISO frames */
1147 if (conn->type == ISO_LINK) {
1148 if (hdev->iso_pkts)
1149 hdev->iso_cnt += conn->sent;
1150 else if (hdev->le_pkts)
1151 hdev->le_cnt += conn->sent;
1152 else
1153 hdev->acl_cnt += conn->sent;
1154 }
1155 }
1156
1157 skb_queue_purge(&conn->data_q);
1158
1159 /* Remove the connection from the list and cleanup its remaining
1160 * state. This is a separate function since for some cases like
1161 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1162 * rest of hci_conn_del.
1163 */
1164 hci_conn_cleanup(conn);
1165
1166 /* Dequeue callbacks using connection pointer as data */
1167 hci_cmd_sync_dequeue(hdev, NULL, conn, NULL);
1168}
1169
1170struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1171{
1172 int use_src = bacmp(src, BDADDR_ANY);
1173 struct hci_dev *hdev = NULL, *d;
1174
1175 BT_DBG("%pMR -> %pMR", src, dst);
1176
1177 read_lock(&hci_dev_list_lock);
1178
1179 list_for_each_entry(d, &hci_dev_list, list) {
1180 if (!test_bit(HCI_UP, &d->flags) ||
1181 hci_dev_test_flag(d, HCI_USER_CHANNEL))
1182 continue;
1183
1184 /* Simple routing:
1185 * No source address - find interface with bdaddr != dst
1186 * Source address - find interface with bdaddr == src
1187 */
1188
1189 if (use_src) {
1190 bdaddr_t id_addr;
1191 u8 id_addr_type;
1192
1193 if (src_type == BDADDR_BREDR) {
1194 if (!lmp_bredr_capable(d))
1195 continue;
1196 bacpy(&id_addr, &d->bdaddr);
1197 id_addr_type = BDADDR_BREDR;
1198 } else {
1199 if (!lmp_le_capable(d))
1200 continue;
1201
1202 hci_copy_identity_address(d, &id_addr,
1203 &id_addr_type);
1204
1205 /* Convert from HCI to three-value type */
1206 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1207 id_addr_type = BDADDR_LE_PUBLIC;
1208 else
1209 id_addr_type = BDADDR_LE_RANDOM;
1210 }
1211
1212 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1213 hdev = d; break;
1214 }
1215 } else {
1216 if (bacmp(&d->bdaddr, dst)) {
1217 hdev = d; break;
1218 }
1219 }
1220 }
1221
1222 if (hdev)
1223 hdev = hci_dev_hold(hdev);
1224
1225 read_unlock(&hci_dev_list_lock);
1226 return hdev;
1227}
1228EXPORT_SYMBOL(hci_get_route);
1229
1230/* This function requires the caller holds hdev->lock */
1231static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1232{
1233 struct hci_dev *hdev = conn->hdev;
1234
1235 hci_connect_le_scan_cleanup(conn, status);
1236
1237 /* Enable advertising in case this was a failed connection
1238 * attempt as a peripheral.
1239 */
1240 hci_enable_advertising(hdev);
1241}
1242
1243/* This function requires the caller holds hdev->lock */
1244void hci_conn_failed(struct hci_conn *conn, u8 status)
1245{
1246 struct hci_dev *hdev = conn->hdev;
1247
1248 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1249
1250 switch (conn->type) {
1251 case LE_LINK:
1252 hci_le_conn_failed(conn, status);
1253 break;
1254 case ACL_LINK:
1255 mgmt_connect_failed(hdev, conn, status);
1256 break;
1257 }
1258
1259 /* In case of BIG/PA sync failed, clear conn flags so that
1260 * the conns will be correctly cleaned up by ISO layer
1261 */
1262 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1263 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1264
1265 conn->state = BT_CLOSED;
1266 hci_connect_cfm(conn, status);
1267 hci_conn_del(conn);
1268}
1269
1270/* This function requires the caller holds hdev->lock */
1271u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1272{
1273 struct hci_dev *hdev = conn->hdev;
1274
1275 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1276
1277 if (conn->handle == handle)
1278 return 0;
1279
1280 if (handle > HCI_CONN_HANDLE_MAX) {
1281 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1282 handle, HCI_CONN_HANDLE_MAX);
1283 return HCI_ERROR_INVALID_PARAMETERS;
1284 }
1285
1286 /* If abort_reason has been sent it means the connection is being
1287 * aborted and the handle shall not be changed.
1288 */
1289 if (conn->abort_reason)
1290 return conn->abort_reason;
1291
1292 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1293 ida_free(&hdev->unset_handle_ida, conn->handle);
1294
1295 conn->handle = handle;
1296
1297 return 0;
1298}
1299
1300struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1301 u8 dst_type, bool dst_resolved, u8 sec_level,
1302 u16 conn_timeout, u8 role, u8 phy, u8 sec_phy)
1303{
1304 struct hci_conn *conn;
1305 struct smp_irk *irk;
1306 int err;
1307
1308 /* Let's make sure that le is enabled.*/
1309 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1310 if (lmp_le_capable(hdev))
1311 return ERR_PTR(-ECONNREFUSED);
1312
1313 return ERR_PTR(-EOPNOTSUPP);
1314 }
1315
1316 /* Since the controller supports only one LE connection attempt at a
1317 * time, we return -EBUSY if there is any connection attempt running.
1318 */
1319 if (hci_lookup_le_connect(hdev))
1320 return ERR_PTR(-EBUSY);
1321
1322 /* If there's already a connection object but it's not in
1323 * scanning state it means it must already be established, in
1324 * which case we can't do anything else except report a failure
1325 * to connect.
1326 */
1327 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1328 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1329 return ERR_PTR(-EBUSY);
1330 }
1331
1332 /* Check if the destination address has been resolved by the controller
1333 * since if it did then the identity address shall be used.
1334 */
1335 if (!dst_resolved) {
1336 /* When given an identity address with existing identity
1337 * resolving key, the connection needs to be established
1338 * to a resolvable random address.
1339 *
1340 * Storing the resolvable random address is required here
1341 * to handle connection failures. The address will later
1342 * be resolved back into the original identity address
1343 * from the connect request.
1344 */
1345 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1346 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1347 dst = &irk->rpa;
1348 dst_type = ADDR_LE_DEV_RANDOM;
1349 }
1350 }
1351
1352 if (conn) {
1353 bacpy(&conn->dst, dst);
1354 } else {
1355 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1356 if (IS_ERR(conn))
1357 return conn;
1358 hci_conn_hold(conn);
1359 conn->pending_sec_level = sec_level;
1360 }
1361
1362 conn->dst_type = dst_type;
1363 conn->sec_level = BT_SECURITY_LOW;
1364 conn->conn_timeout = conn_timeout;
1365 conn->le_adv_phy = phy;
1366 conn->le_adv_sec_phy = sec_phy;
1367
1368 err = hci_connect_le_sync(hdev, conn);
1369 if (err) {
1370 hci_conn_del(conn);
1371 return ERR_PTR(err);
1372 }
1373
1374 return conn;
1375}
1376
1377static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1378{
1379 struct hci_conn *conn;
1380
1381 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1382 if (!conn)
1383 return false;
1384
1385 if (conn->state != BT_CONNECTED)
1386 return false;
1387
1388 return true;
1389}
1390
1391/* This function requires the caller holds hdev->lock */
1392static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1393 bdaddr_t *addr, u8 addr_type)
1394{
1395 struct hci_conn_params *params;
1396
1397 if (is_connected(hdev, addr, addr_type))
1398 return -EISCONN;
1399
1400 params = hci_conn_params_lookup(hdev, addr, addr_type);
1401 if (!params) {
1402 params = hci_conn_params_add(hdev, addr, addr_type);
1403 if (!params)
1404 return -ENOMEM;
1405
1406 /* If we created new params, mark them to be deleted in
1407 * hci_connect_le_scan_cleanup. It's different case than
1408 * existing disabled params, those will stay after cleanup.
1409 */
1410 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1411 }
1412
1413 /* We're trying to connect, so make sure params are at pend_le_conns */
1414 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1415 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1416 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1417 hci_pend_le_list_del_init(params);
1418 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1419 }
1420
1421 params->explicit_connect = true;
1422
1423 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1424 params->auto_connect);
1425
1426 return 0;
1427}
1428
1429static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1430{
1431 struct hci_conn *conn;
1432 u8 big;
1433
1434 /* Allocate a BIG if not set */
1435 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1436 for (big = 0x00; big < 0xef; big++) {
1437
1438 conn = hci_conn_hash_lookup_big(hdev, big);
1439 if (!conn)
1440 break;
1441 }
1442
1443 if (big == 0xef)
1444 return -EADDRNOTAVAIL;
1445
1446 /* Update BIG */
1447 qos->bcast.big = big;
1448 }
1449
1450 return 0;
1451}
1452
1453static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1454{
1455 struct hci_conn *conn;
1456 u8 bis;
1457
1458 /* Allocate BIS if not set */
1459 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1460 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1461 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1462
1463 if (conn) {
1464 /* If the BIG handle is already matched to an advertising
1465 * handle, do not allocate a new one.
1466 */
1467 qos->bcast.bis = conn->iso_qos.bcast.bis;
1468 return 0;
1469 }
1470 }
1471
1472 /* Find an unused adv set to advertise BIS, skip instance 0x00
1473 * since it is reserved as general purpose set.
1474 */
1475 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1476 bis++) {
1477
1478 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1479 if (!conn)
1480 break;
1481 }
1482
1483 if (bis == hdev->le_num_of_adv_sets)
1484 return -EADDRNOTAVAIL;
1485
1486 /* Update BIS */
1487 qos->bcast.bis = bis;
1488 }
1489
1490 return 0;
1491}
1492
1493/* This function requires the caller holds hdev->lock */
1494static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1495 struct bt_iso_qos *qos, __u8 base_len,
1496 __u8 *base)
1497{
1498 struct hci_conn *conn;
1499 int err;
1500
1501 /* Let's make sure that le is enabled.*/
1502 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1503 if (lmp_le_capable(hdev))
1504 return ERR_PTR(-ECONNREFUSED);
1505 return ERR_PTR(-EOPNOTSUPP);
1506 }
1507
1508 err = qos_set_big(hdev, qos);
1509 if (err)
1510 return ERR_PTR(err);
1511
1512 err = qos_set_bis(hdev, qos);
1513 if (err)
1514 return ERR_PTR(err);
1515
1516 /* Check if the LE Create BIG command has already been sent */
1517 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1518 qos->bcast.big);
1519 if (conn)
1520 return ERR_PTR(-EADDRINUSE);
1521
1522 /* Check BIS settings against other bound BISes, since all
1523 * BISes in a BIG must have the same value for all parameters
1524 */
1525 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1526
1527 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1528 base_len != conn->le_per_adv_data_len ||
1529 memcmp(conn->le_per_adv_data, base, base_len)))
1530 return ERR_PTR(-EADDRINUSE);
1531
1532 conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1533 if (IS_ERR(conn))
1534 return conn;
1535
1536 conn->state = BT_CONNECT;
1537
1538 hci_conn_hold(conn);
1539 return conn;
1540}
1541
1542/* This function requires the caller holds hdev->lock */
1543struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1544 u8 dst_type, u8 sec_level,
1545 u16 conn_timeout,
1546 enum conn_reasons conn_reason)
1547{
1548 struct hci_conn *conn;
1549
1550 /* Let's make sure that le is enabled.*/
1551 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1552 if (lmp_le_capable(hdev))
1553 return ERR_PTR(-ECONNREFUSED);
1554
1555 return ERR_PTR(-EOPNOTSUPP);
1556 }
1557
1558 /* Some devices send ATT messages as soon as the physical link is
1559 * established. To be able to handle these ATT messages, the user-
1560 * space first establishes the connection and then starts the pairing
1561 * process.
1562 *
1563 * So if a hci_conn object already exists for the following connection
1564 * attempt, we simply update pending_sec_level and auth_type fields
1565 * and return the object found.
1566 */
1567 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1568 if (conn) {
1569 if (conn->pending_sec_level < sec_level)
1570 conn->pending_sec_level = sec_level;
1571 goto done;
1572 }
1573
1574 BT_DBG("requesting refresh of dst_addr");
1575
1576 conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1577 if (IS_ERR(conn))
1578 return conn;
1579
1580 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1581 hci_conn_del(conn);
1582 return ERR_PTR(-EBUSY);
1583 }
1584
1585 conn->state = BT_CONNECT;
1586 set_bit(HCI_CONN_SCANNING, &conn->flags);
1587 conn->dst_type = dst_type;
1588 conn->sec_level = BT_SECURITY_LOW;
1589 conn->pending_sec_level = sec_level;
1590 conn->conn_timeout = conn_timeout;
1591 conn->conn_reason = conn_reason;
1592
1593 hci_update_passive_scan(hdev);
1594
1595done:
1596 hci_conn_hold(conn);
1597 return conn;
1598}
1599
1600struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1601 u8 sec_level, u8 auth_type,
1602 enum conn_reasons conn_reason, u16 timeout)
1603{
1604 struct hci_conn *acl;
1605
1606 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1607 if (lmp_bredr_capable(hdev))
1608 return ERR_PTR(-ECONNREFUSED);
1609
1610 return ERR_PTR(-EOPNOTSUPP);
1611 }
1612
1613 /* Reject outgoing connection to device with same BD ADDR against
1614 * CVE-2020-26555
1615 */
1616 if (!bacmp(&hdev->bdaddr, dst)) {
1617 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1618 dst);
1619 return ERR_PTR(-ECONNREFUSED);
1620 }
1621
1622 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1623 if (!acl) {
1624 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1625 if (IS_ERR(acl))
1626 return acl;
1627 }
1628
1629 hci_conn_hold(acl);
1630
1631 acl->conn_reason = conn_reason;
1632 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1633 int err;
1634
1635 acl->sec_level = BT_SECURITY_LOW;
1636 acl->pending_sec_level = sec_level;
1637 acl->auth_type = auth_type;
1638 acl->conn_timeout = timeout;
1639
1640 err = hci_connect_acl_sync(hdev, acl);
1641 if (err) {
1642 hci_conn_del(acl);
1643 return ERR_PTR(err);
1644 }
1645 }
1646
1647 return acl;
1648}
1649
1650static struct hci_link *hci_conn_link(struct hci_conn *parent,
1651 struct hci_conn *conn)
1652{
1653 struct hci_dev *hdev = parent->hdev;
1654 struct hci_link *link;
1655
1656 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1657
1658 if (conn->link)
1659 return conn->link;
1660
1661 if (conn->parent)
1662 return NULL;
1663
1664 link = kzalloc(sizeof(*link), GFP_KERNEL);
1665 if (!link)
1666 return NULL;
1667
1668 link->conn = hci_conn_hold(conn);
1669 conn->link = link;
1670 conn->parent = hci_conn_get(parent);
1671
1672 /* Use list_add_tail_rcu append to the list */
1673 list_add_tail_rcu(&link->list, &parent->link_list);
1674
1675 return link;
1676}
1677
1678struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1679 __u16 setting, struct bt_codec *codec,
1680 u16 timeout)
1681{
1682 struct hci_conn *acl;
1683 struct hci_conn *sco;
1684 struct hci_link *link;
1685
1686 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1687 CONN_REASON_SCO_CONNECT, timeout);
1688 if (IS_ERR(acl))
1689 return acl;
1690
1691 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1692 if (!sco) {
1693 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1694 if (IS_ERR(sco)) {
1695 hci_conn_drop(acl);
1696 return sco;
1697 }
1698 }
1699
1700 link = hci_conn_link(acl, sco);
1701 if (!link) {
1702 hci_conn_drop(acl);
1703 hci_conn_drop(sco);
1704 return ERR_PTR(-ENOLINK);
1705 }
1706
1707 sco->setting = setting;
1708 sco->codec = *codec;
1709
1710 if (acl->state == BT_CONNECTED &&
1711 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1712 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1713 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1714
1715 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1716 /* defer SCO setup until mode change completed */
1717 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1718 return sco;
1719 }
1720
1721 hci_sco_setup(acl, 0x00);
1722 }
1723
1724 return sco;
1725}
1726
1727static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1728{
1729 struct hci_dev *hdev = conn->hdev;
1730 struct hci_cp_le_create_big cp;
1731 struct iso_list_data data;
1732
1733 memset(&cp, 0, sizeof(cp));
1734
1735 data.big = qos->bcast.big;
1736 data.bis = qos->bcast.bis;
1737 data.count = 0;
1738
1739 /* Create a BIS for each bound connection */
1740 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
1741 BT_BOUND, &data);
1742
1743 cp.handle = qos->bcast.big;
1744 cp.adv_handle = qos->bcast.bis;
1745 cp.num_bis = data.count;
1746 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1747 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1748 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1749 cp.bis.rtn = qos->bcast.out.rtn;
1750 cp.bis.phy = qos->bcast.out.phy;
1751 cp.bis.packing = qos->bcast.packing;
1752 cp.bis.framing = qos->bcast.framing;
1753 cp.bis.encryption = qos->bcast.encryption;
1754 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1755
1756 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1757}
1758
1759static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1760{
1761 DEFINE_FLEX(struct hci_cp_le_set_cig_params, pdu, cis, num_cis, 0x1f);
1762 u8 cig_id = PTR_UINT(data);
1763 struct hci_conn *conn;
1764 struct bt_iso_qos *qos;
1765 u8 aux_num_cis = 0;
1766 u8 cis_id;
1767
1768 conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1769 if (!conn)
1770 return 0;
1771
1772 qos = &conn->iso_qos;
1773 pdu->cig_id = cig_id;
1774 hci_cpu_to_le24(qos->ucast.out.interval, pdu->c_interval);
1775 hci_cpu_to_le24(qos->ucast.in.interval, pdu->p_interval);
1776 pdu->sca = qos->ucast.sca;
1777 pdu->packing = qos->ucast.packing;
1778 pdu->framing = qos->ucast.framing;
1779 pdu->c_latency = cpu_to_le16(qos->ucast.out.latency);
1780 pdu->p_latency = cpu_to_le16(qos->ucast.in.latency);
1781
1782 /* Reprogram all CIS(s) with the same CIG, valid range are:
1783 * num_cis: 0x00 to 0x1F
1784 * cis_id: 0x00 to 0xEF
1785 */
1786 for (cis_id = 0x00; cis_id < 0xf0 &&
1787 aux_num_cis < pdu->num_cis; cis_id++) {
1788 struct hci_cis_params *cis;
1789
1790 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1791 if (!conn)
1792 continue;
1793
1794 qos = &conn->iso_qos;
1795
1796 cis = &pdu->cis[aux_num_cis++];
1797 cis->cis_id = cis_id;
1798 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1799 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1800 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
1801 qos->ucast.in.phy;
1802 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
1803 qos->ucast.out.phy;
1804 cis->c_rtn = qos->ucast.out.rtn;
1805 cis->p_rtn = qos->ucast.in.rtn;
1806 }
1807 pdu->num_cis = aux_num_cis;
1808
1809 if (!pdu->num_cis)
1810 return 0;
1811
1812 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1813 struct_size(pdu, cis, pdu->num_cis),
1814 pdu, HCI_CMD_TIMEOUT);
1815}
1816
1817static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1818{
1819 struct hci_dev *hdev = conn->hdev;
1820 struct iso_list_data data;
1821
1822 memset(&data, 0, sizeof(data));
1823
1824 /* Allocate first still reconfigurable CIG if not set */
1825 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1826 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1827 data.count = 0;
1828
1829 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1830 BT_CONNECT, &data);
1831 if (data.count)
1832 continue;
1833
1834 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1835 BT_CONNECTED, &data);
1836 if (!data.count)
1837 break;
1838 }
1839
1840 if (data.cig == 0xf0)
1841 return false;
1842
1843 /* Update CIG */
1844 qos->ucast.cig = data.cig;
1845 }
1846
1847 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1848 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1849 qos->ucast.cis))
1850 return false;
1851 goto done;
1852 }
1853
1854 /* Allocate first available CIS if not set */
1855 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1856 data.cis++) {
1857 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1858 data.cis)) {
1859 /* Update CIS */
1860 qos->ucast.cis = data.cis;
1861 break;
1862 }
1863 }
1864
1865 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1866 return false;
1867
1868done:
1869 if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1870 UINT_PTR(qos->ucast.cig), NULL) < 0)
1871 return false;
1872
1873 return true;
1874}
1875
1876struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1877 __u8 dst_type, struct bt_iso_qos *qos)
1878{
1879 struct hci_conn *cis;
1880
1881 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1882 qos->ucast.cis);
1883 if (!cis) {
1884 cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1885 if (IS_ERR(cis))
1886 return cis;
1887 cis->cleanup = cis_cleanup;
1888 cis->dst_type = dst_type;
1889 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1890 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1891 }
1892
1893 if (cis->state == BT_CONNECTED)
1894 return cis;
1895
1896 /* Check if CIS has been set and the settings matches */
1897 if (cis->state == BT_BOUND &&
1898 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1899 return cis;
1900
1901 /* Update LINK PHYs according to QoS preference */
1902 cis->le_tx_phy = qos->ucast.out.phy;
1903 cis->le_rx_phy = qos->ucast.in.phy;
1904
1905 /* If output interval is not set use the input interval as it cannot be
1906 * 0x000000.
1907 */
1908 if (!qos->ucast.out.interval)
1909 qos->ucast.out.interval = qos->ucast.in.interval;
1910
1911 /* If input interval is not set use the output interval as it cannot be
1912 * 0x000000.
1913 */
1914 if (!qos->ucast.in.interval)
1915 qos->ucast.in.interval = qos->ucast.out.interval;
1916
1917 /* If output latency is not set use the input latency as it cannot be
1918 * 0x0000.
1919 */
1920 if (!qos->ucast.out.latency)
1921 qos->ucast.out.latency = qos->ucast.in.latency;
1922
1923 /* If input latency is not set use the output latency as it cannot be
1924 * 0x0000.
1925 */
1926 if (!qos->ucast.in.latency)
1927 qos->ucast.in.latency = qos->ucast.out.latency;
1928
1929 if (!hci_le_set_cig_params(cis, qos)) {
1930 hci_conn_drop(cis);
1931 return ERR_PTR(-EINVAL);
1932 }
1933
1934 hci_conn_hold(cis);
1935
1936 cis->iso_qos = *qos;
1937 cis->state = BT_BOUND;
1938
1939 return cis;
1940}
1941
1942bool hci_iso_setup_path(struct hci_conn *conn)
1943{
1944 struct hci_dev *hdev = conn->hdev;
1945 struct hci_cp_le_setup_iso_path cmd;
1946
1947 memset(&cmd, 0, sizeof(cmd));
1948
1949 if (conn->iso_qos.ucast.out.sdu) {
1950 cmd.handle = cpu_to_le16(conn->handle);
1951 cmd.direction = 0x00; /* Input (Host to Controller) */
1952 cmd.path = 0x00; /* HCI path if enabled */
1953 cmd.codec = 0x03; /* Transparent Data */
1954
1955 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1956 &cmd) < 0)
1957 return false;
1958 }
1959
1960 if (conn->iso_qos.ucast.in.sdu) {
1961 cmd.handle = cpu_to_le16(conn->handle);
1962 cmd.direction = 0x01; /* Output (Controller to Host) */
1963 cmd.path = 0x00; /* HCI path if enabled */
1964 cmd.codec = 0x03; /* Transparent Data */
1965
1966 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1967 &cmd) < 0)
1968 return false;
1969 }
1970
1971 return true;
1972}
1973
1974int hci_conn_check_create_cis(struct hci_conn *conn)
1975{
1976 if (conn->type != ISO_LINK || !bacmp(&conn->dst, BDADDR_ANY))
1977 return -EINVAL;
1978
1979 if (!conn->parent || conn->parent->state != BT_CONNECTED ||
1980 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
1981 return 1;
1982
1983 return 0;
1984}
1985
1986static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
1987{
1988 return hci_le_create_cis_sync(hdev);
1989}
1990
1991int hci_le_create_cis_pending(struct hci_dev *hdev)
1992{
1993 struct hci_conn *conn;
1994 bool pending = false;
1995
1996 rcu_read_lock();
1997
1998 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
1999 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2000 rcu_read_unlock();
2001 return -EBUSY;
2002 }
2003
2004 if (!hci_conn_check_create_cis(conn))
2005 pending = true;
2006 }
2007
2008 rcu_read_unlock();
2009
2010 if (!pending)
2011 return 0;
2012
2013 /* Queue Create CIS */
2014 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2015}
2016
2017static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2018 struct bt_iso_io_qos *qos, __u8 phy)
2019{
2020 /* Only set MTU if PHY is enabled */
2021 if (!qos->sdu && qos->phy)
2022 qos->sdu = conn->mtu;
2023
2024 /* Use the same PHY as ACL if set to any */
2025 if (qos->phy == BT_ISO_PHY_ANY)
2026 qos->phy = phy;
2027
2028 /* Use LE ACL connection interval if not set */
2029 if (!qos->interval)
2030 /* ACL interval unit in 1.25 ms to us */
2031 qos->interval = conn->le_conn_interval * 1250;
2032
2033 /* Use LE ACL connection latency if not set */
2034 if (!qos->latency)
2035 qos->latency = conn->le_conn_latency;
2036}
2037
2038static int create_big_sync(struct hci_dev *hdev, void *data)
2039{
2040 struct hci_conn *conn = data;
2041 struct bt_iso_qos *qos = &conn->iso_qos;
2042 u16 interval, sync_interval = 0;
2043 u32 flags = 0;
2044 int err;
2045
2046 if (qos->bcast.out.phy == 0x02)
2047 flags |= MGMT_ADV_FLAG_SEC_2M;
2048
2049 /* Align intervals */
2050 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2051
2052 if (qos->bcast.bis)
2053 sync_interval = interval * 4;
2054
2055 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len,
2056 conn->le_per_adv_data, flags, interval,
2057 interval, sync_interval);
2058 if (err)
2059 return err;
2060
2061 return hci_le_create_big(conn, &conn->iso_qos);
2062}
2063
2064static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
2065{
2066 bt_dev_dbg(hdev, "");
2067
2068 if (err)
2069 bt_dev_err(hdev, "Unable to create PA: %d", err);
2070}
2071
2072static bool hci_conn_check_create_pa_sync(struct hci_conn *conn)
2073{
2074 if (conn->type != ISO_LINK || conn->sid == HCI_SID_INVALID)
2075 return false;
2076
2077 return true;
2078}
2079
2080static int create_pa_sync(struct hci_dev *hdev, void *data)
2081{
2082 struct hci_cp_le_pa_create_sync cp = {0};
2083 struct hci_conn *conn;
2084 int err = 0;
2085
2086 hci_dev_lock(hdev);
2087
2088 rcu_read_lock();
2089
2090 /* The spec allows only one pending LE Periodic Advertising Create
2091 * Sync command at a time. If the command is pending now, don't do
2092 * anything. We check for pending connections after each PA Sync
2093 * Established event.
2094 *
2095 * BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
2096 * page 2493:
2097 *
2098 * If the Host issues this command when another HCI_LE_Periodic_
2099 * Advertising_Create_Sync command is pending, the Controller shall
2100 * return the error code Command Disallowed (0x0C).
2101 */
2102 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2103 if (test_bit(HCI_CONN_CREATE_PA_SYNC, &conn->flags))
2104 goto unlock;
2105 }
2106
2107 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2108 if (hci_conn_check_create_pa_sync(conn)) {
2109 struct bt_iso_qos *qos = &conn->iso_qos;
2110
2111 cp.options = qos->bcast.options;
2112 cp.sid = conn->sid;
2113 cp.addr_type = conn->dst_type;
2114 bacpy(&cp.addr, &conn->dst);
2115 cp.skip = cpu_to_le16(qos->bcast.skip);
2116 cp.sync_timeout = cpu_to_le16(qos->bcast.sync_timeout);
2117 cp.sync_cte_type = qos->bcast.sync_cte_type;
2118
2119 break;
2120 }
2121 }
2122
2123unlock:
2124 rcu_read_unlock();
2125
2126 hci_dev_unlock(hdev);
2127
2128 if (bacmp(&cp.addr, BDADDR_ANY)) {
2129 hci_dev_set_flag(hdev, HCI_PA_SYNC);
2130 set_bit(HCI_CONN_CREATE_PA_SYNC, &conn->flags);
2131
2132 err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
2133 sizeof(cp), &cp, HCI_CMD_TIMEOUT);
2134 if (!err)
2135 err = hci_update_passive_scan_sync(hdev);
2136
2137 if (err) {
2138 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2139 clear_bit(HCI_CONN_CREATE_PA_SYNC, &conn->flags);
2140 }
2141 }
2142
2143 return err;
2144}
2145
2146int hci_pa_create_sync_pending(struct hci_dev *hdev)
2147{
2148 /* Queue start pa_create_sync and scan */
2149 return hci_cmd_sync_queue(hdev, create_pa_sync,
2150 NULL, create_pa_complete);
2151}
2152
2153struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst,
2154 __u8 dst_type, __u8 sid,
2155 struct bt_iso_qos *qos)
2156{
2157 struct hci_conn *conn;
2158
2159 conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_SLAVE);
2160 if (IS_ERR(conn))
2161 return conn;
2162
2163 conn->iso_qos = *qos;
2164 conn->dst_type = dst_type;
2165 conn->sid = sid;
2166 conn->state = BT_LISTEN;
2167
2168 hci_conn_hold(conn);
2169
2170 hci_pa_create_sync_pending(hdev);
2171
2172 return conn;
2173}
2174
2175static bool hci_conn_check_create_big_sync(struct hci_conn *conn)
2176{
2177 if (!conn->num_bis)
2178 return false;
2179
2180 return true;
2181}
2182
2183static void big_create_sync_complete(struct hci_dev *hdev, void *data, int err)
2184{
2185 bt_dev_dbg(hdev, "");
2186
2187 if (err)
2188 bt_dev_err(hdev, "Unable to create BIG sync: %d", err);
2189}
2190
2191static int big_create_sync(struct hci_dev *hdev, void *data)
2192{
2193 DEFINE_FLEX(struct hci_cp_le_big_create_sync, pdu, bis, num_bis, 0x11);
2194 struct hci_conn *conn;
2195
2196 rcu_read_lock();
2197
2198 pdu->num_bis = 0;
2199
2200 /* The spec allows only one pending LE BIG Create Sync command at
2201 * a time. If the command is pending now, don't do anything. We
2202 * check for pending connections after each BIG Sync Established
2203 * event.
2204 *
2205 * BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
2206 * page 2586:
2207 *
2208 * If the Host sends this command when the Controller is in the
2209 * process of synchronizing to any BIG, i.e. the HCI_LE_BIG_Sync_
2210 * Established event has not been generated, the Controller shall
2211 * return the error code Command Disallowed (0x0C).
2212 */
2213 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2214 if (test_bit(HCI_CONN_CREATE_BIG_SYNC, &conn->flags))
2215 goto unlock;
2216 }
2217
2218 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2219 if (hci_conn_check_create_big_sync(conn)) {
2220 struct bt_iso_qos *qos = &conn->iso_qos;
2221
2222 set_bit(HCI_CONN_CREATE_BIG_SYNC, &conn->flags);
2223
2224 pdu->handle = qos->bcast.big;
2225 pdu->sync_handle = cpu_to_le16(conn->sync_handle);
2226 pdu->encryption = qos->bcast.encryption;
2227 memcpy(pdu->bcode, qos->bcast.bcode,
2228 sizeof(pdu->bcode));
2229 pdu->mse = qos->bcast.mse;
2230 pdu->timeout = cpu_to_le16(qos->bcast.timeout);
2231 pdu->num_bis = conn->num_bis;
2232 memcpy(pdu->bis, conn->bis, conn->num_bis);
2233
2234 break;
2235 }
2236 }
2237
2238unlock:
2239 rcu_read_unlock();
2240
2241 if (!pdu->num_bis)
2242 return 0;
2243
2244 return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
2245 struct_size(pdu, bis, pdu->num_bis), pdu);
2246}
2247
2248int hci_le_big_create_sync_pending(struct hci_dev *hdev)
2249{
2250 /* Queue big_create_sync */
2251 return hci_cmd_sync_queue_once(hdev, big_create_sync,
2252 NULL, big_create_sync_complete);
2253}
2254
2255int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2256 struct bt_iso_qos *qos,
2257 __u16 sync_handle, __u8 num_bis, __u8 bis[])
2258{
2259 int err;
2260
2261 if (num_bis < 0x01 || num_bis > ISO_MAX_NUM_BIS)
2262 return -EINVAL;
2263
2264 err = qos_set_big(hdev, qos);
2265 if (err)
2266 return err;
2267
2268 if (hcon) {
2269 /* Update hcon QoS */
2270 hcon->iso_qos = *qos;
2271
2272 hcon->num_bis = num_bis;
2273 memcpy(hcon->bis, bis, num_bis);
2274 }
2275
2276 return hci_le_big_create_sync_pending(hdev);
2277}
2278
2279static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2280{
2281 struct hci_conn *conn = data;
2282
2283 bt_dev_dbg(hdev, "conn %p", conn);
2284
2285 if (err) {
2286 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2287 hci_connect_cfm(conn, err);
2288 hci_conn_del(conn);
2289 }
2290}
2291
2292struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst,
2293 struct bt_iso_qos *qos,
2294 __u8 base_len, __u8 *base)
2295{
2296 struct hci_conn *conn;
2297 struct hci_conn *parent;
2298 __u8 eir[HCI_MAX_PER_AD_LENGTH];
2299 struct hci_link *link;
2300
2301 /* Look for any BIS that is open for rebinding */
2302 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN);
2303 if (conn) {
2304 memcpy(qos, &conn->iso_qos, sizeof(*qos));
2305 conn->state = BT_CONNECTED;
2306 return conn;
2307 }
2308
2309 if (base_len && base)
2310 base_len = eir_append_service_data(eir, 0, 0x1851,
2311 base, base_len);
2312
2313 /* We need hci_conn object using the BDADDR_ANY as dst */
2314 conn = hci_add_bis(hdev, dst, qos, base_len, eir);
2315 if (IS_ERR(conn))
2316 return conn;
2317
2318 /* Update LINK PHYs according to QoS preference */
2319 conn->le_tx_phy = qos->bcast.out.phy;
2320 conn->le_tx_phy = qos->bcast.out.phy;
2321
2322 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2323 if (base_len && base) {
2324 memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2325 conn->le_per_adv_data_len = base_len;
2326 }
2327
2328 hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2329 conn->le_tx_phy ? conn->le_tx_phy :
2330 hdev->le_tx_def_phys);
2331
2332 conn->iso_qos = *qos;
2333 conn->state = BT_BOUND;
2334
2335 /* Link BISes together */
2336 parent = hci_conn_hash_lookup_big(hdev,
2337 conn->iso_qos.bcast.big);
2338 if (parent && parent != conn) {
2339 link = hci_conn_link(parent, conn);
2340 hci_conn_drop(conn);
2341 if (!link)
2342 return ERR_PTR(-ENOLINK);
2343 }
2344
2345 return conn;
2346}
2347
2348static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2349{
2350 struct iso_list_data *d = data;
2351
2352 /* Skip if not broadcast/ANY address */
2353 if (bacmp(&conn->dst, BDADDR_ANY))
2354 return;
2355
2356 if (d->big != conn->iso_qos.bcast.big ||
2357 d->bis == BT_ISO_QOS_BIS_UNSET ||
2358 d->bis != conn->iso_qos.bcast.bis)
2359 return;
2360
2361 set_bit(HCI_CONN_PER_ADV, &conn->flags);
2362}
2363
2364struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2365 __u8 dst_type, struct bt_iso_qos *qos,
2366 __u8 base_len, __u8 *base)
2367{
2368 struct hci_conn *conn;
2369 int err;
2370 struct iso_list_data data;
2371
2372 conn = hci_bind_bis(hdev, dst, qos, base_len, base);
2373 if (IS_ERR(conn))
2374 return conn;
2375
2376 if (conn->state == BT_CONNECTED)
2377 return conn;
2378
2379 data.big = qos->bcast.big;
2380 data.bis = qos->bcast.bis;
2381
2382 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2383 * the start periodic advertising and create BIG commands have
2384 * been queued
2385 */
2386 hci_conn_hash_list_state(hdev, bis_mark_per_adv, ISO_LINK,
2387 BT_BOUND, &data);
2388
2389 /* Queue start periodic advertising and create BIG */
2390 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2391 create_big_complete);
2392 if (err < 0) {
2393 hci_conn_drop(conn);
2394 return ERR_PTR(err);
2395 }
2396
2397 return conn;
2398}
2399
2400struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2401 __u8 dst_type, struct bt_iso_qos *qos)
2402{
2403 struct hci_conn *le;
2404 struct hci_conn *cis;
2405 struct hci_link *link;
2406
2407 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2408 le = hci_connect_le(hdev, dst, dst_type, false,
2409 BT_SECURITY_LOW,
2410 HCI_LE_CONN_TIMEOUT,
2411 HCI_ROLE_SLAVE, 0, 0);
2412 else
2413 le = hci_connect_le_scan(hdev, dst, dst_type,
2414 BT_SECURITY_LOW,
2415 HCI_LE_CONN_TIMEOUT,
2416 CONN_REASON_ISO_CONNECT);
2417 if (IS_ERR(le))
2418 return le;
2419
2420 hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2421 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2422 hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2423 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2424
2425 cis = hci_bind_cis(hdev, dst, dst_type, qos);
2426 if (IS_ERR(cis)) {
2427 hci_conn_drop(le);
2428 return cis;
2429 }
2430
2431 link = hci_conn_link(le, cis);
2432 hci_conn_drop(cis);
2433 if (!link) {
2434 hci_conn_drop(le);
2435 return ERR_PTR(-ENOLINK);
2436 }
2437
2438 cis->state = BT_CONNECT;
2439
2440 hci_le_create_cis_pending(hdev);
2441
2442 return cis;
2443}
2444
2445/* Check link security requirement */
2446int hci_conn_check_link_mode(struct hci_conn *conn)
2447{
2448 BT_DBG("hcon %p", conn);
2449
2450 /* In Secure Connections Only mode, it is required that Secure
2451 * Connections is used and the link is encrypted with AES-CCM
2452 * using a P-256 authenticated combination key.
2453 */
2454 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2455 if (!hci_conn_sc_enabled(conn) ||
2456 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2457 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2458 return 0;
2459 }
2460
2461 /* AES encryption is required for Level 4:
2462 *
2463 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2464 * page 1319:
2465 *
2466 * 128-bit equivalent strength for link and encryption keys
2467 * required using FIPS approved algorithms (E0 not allowed,
2468 * SAFER+ not allowed, and P-192 not allowed; encryption key
2469 * not shortened)
2470 */
2471 if (conn->sec_level == BT_SECURITY_FIPS &&
2472 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2473 bt_dev_err(conn->hdev,
2474 "Invalid security: Missing AES-CCM usage");
2475 return 0;
2476 }
2477
2478 if (hci_conn_ssp_enabled(conn) &&
2479 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2480 return 0;
2481
2482 return 1;
2483}
2484
2485/* Authenticate remote device */
2486static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2487{
2488 BT_DBG("hcon %p", conn);
2489
2490 if (conn->pending_sec_level > sec_level)
2491 sec_level = conn->pending_sec_level;
2492
2493 if (sec_level > conn->sec_level)
2494 conn->pending_sec_level = sec_level;
2495 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2496 return 1;
2497
2498 /* Make sure we preserve an existing MITM requirement*/
2499 auth_type |= (conn->auth_type & 0x01);
2500
2501 conn->auth_type = auth_type;
2502
2503 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2504 struct hci_cp_auth_requested cp;
2505
2506 cp.handle = cpu_to_le16(conn->handle);
2507 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2508 sizeof(cp), &cp);
2509
2510 /* Set the ENCRYPT_PEND to trigger encryption after
2511 * authentication.
2512 */
2513 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2514 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2515 }
2516
2517 return 0;
2518}
2519
2520/* Encrypt the link */
2521static void hci_conn_encrypt(struct hci_conn *conn)
2522{
2523 BT_DBG("hcon %p", conn);
2524
2525 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2526 struct hci_cp_set_conn_encrypt cp;
2527 cp.handle = cpu_to_le16(conn->handle);
2528 cp.encrypt = 0x01;
2529 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2530 &cp);
2531 }
2532}
2533
2534/* Enable security */
2535int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2536 bool initiator)
2537{
2538 BT_DBG("hcon %p", conn);
2539
2540 if (conn->type == LE_LINK)
2541 return smp_conn_security(conn, sec_level);
2542
2543 /* For sdp we don't need the link key. */
2544 if (sec_level == BT_SECURITY_SDP)
2545 return 1;
2546
2547 /* For non 2.1 devices and low security level we don't need the link
2548 key. */
2549 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2550 return 1;
2551
2552 /* For other security levels we need the link key. */
2553 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2554 goto auth;
2555
2556 switch (conn->key_type) {
2557 case HCI_LK_AUTH_COMBINATION_P256:
2558 /* An authenticated FIPS approved combination key has
2559 * sufficient security for security level 4 or lower.
2560 */
2561 if (sec_level <= BT_SECURITY_FIPS)
2562 goto encrypt;
2563 break;
2564 case HCI_LK_AUTH_COMBINATION_P192:
2565 /* An authenticated combination key has sufficient security for
2566 * security level 3 or lower.
2567 */
2568 if (sec_level <= BT_SECURITY_HIGH)
2569 goto encrypt;
2570 break;
2571 case HCI_LK_UNAUTH_COMBINATION_P192:
2572 case HCI_LK_UNAUTH_COMBINATION_P256:
2573 /* An unauthenticated combination key has sufficient security
2574 * for security level 2 or lower.
2575 */
2576 if (sec_level <= BT_SECURITY_MEDIUM)
2577 goto encrypt;
2578 break;
2579 case HCI_LK_COMBINATION:
2580 /* A combination key has always sufficient security for the
2581 * security levels 2 or lower. High security level requires the
2582 * combination key is generated using maximum PIN code length
2583 * (16). For pre 2.1 units.
2584 */
2585 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2586 goto encrypt;
2587 break;
2588 default:
2589 break;
2590 }
2591
2592auth:
2593 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2594 return 0;
2595
2596 if (initiator)
2597 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2598
2599 if (!hci_conn_auth(conn, sec_level, auth_type))
2600 return 0;
2601
2602encrypt:
2603 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2604 /* Ensure that the encryption key size has been read,
2605 * otherwise stall the upper layer responses.
2606 */
2607 if (!conn->enc_key_size)
2608 return 0;
2609
2610 /* Nothing else needed, all requirements are met */
2611 return 1;
2612 }
2613
2614 hci_conn_encrypt(conn);
2615 return 0;
2616}
2617EXPORT_SYMBOL(hci_conn_security);
2618
2619/* Check secure link requirement */
2620int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2621{
2622 BT_DBG("hcon %p", conn);
2623
2624 /* Accept if non-secure or higher security level is required */
2625 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2626 return 1;
2627
2628 /* Accept if secure or higher security level is already present */
2629 if (conn->sec_level == BT_SECURITY_HIGH ||
2630 conn->sec_level == BT_SECURITY_FIPS)
2631 return 1;
2632
2633 /* Reject not secure link */
2634 return 0;
2635}
2636EXPORT_SYMBOL(hci_conn_check_secure);
2637
2638/* Switch role */
2639int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2640{
2641 BT_DBG("hcon %p", conn);
2642
2643 if (role == conn->role)
2644 return 1;
2645
2646 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2647 struct hci_cp_switch_role cp;
2648 bacpy(&cp.bdaddr, &conn->dst);
2649 cp.role = role;
2650 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2651 }
2652
2653 return 0;
2654}
2655EXPORT_SYMBOL(hci_conn_switch_role);
2656
2657/* Enter active mode */
2658void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2659{
2660 struct hci_dev *hdev = conn->hdev;
2661
2662 BT_DBG("hcon %p mode %d", conn, conn->mode);
2663
2664 if (conn->mode != HCI_CM_SNIFF)
2665 goto timer;
2666
2667 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2668 goto timer;
2669
2670 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2671 struct hci_cp_exit_sniff_mode cp;
2672 cp.handle = cpu_to_le16(conn->handle);
2673 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2674 }
2675
2676timer:
2677 if (hdev->idle_timeout > 0)
2678 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2679 msecs_to_jiffies(hdev->idle_timeout));
2680}
2681
2682/* Drop all connection on the device */
2683void hci_conn_hash_flush(struct hci_dev *hdev)
2684{
2685 struct list_head *head = &hdev->conn_hash.list;
2686 struct hci_conn *conn;
2687
2688 BT_DBG("hdev %s", hdev->name);
2689
2690 /* We should not traverse the list here, because hci_conn_del
2691 * can remove extra links, which may cause the list traversal
2692 * to hit items that have already been released.
2693 */
2694 while ((conn = list_first_entry_or_null(head,
2695 struct hci_conn,
2696 list)) != NULL) {
2697 conn->state = BT_CLOSED;
2698 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2699 hci_conn_del(conn);
2700 }
2701}
2702
2703static u32 get_link_mode(struct hci_conn *conn)
2704{
2705 u32 link_mode = 0;
2706
2707 if (conn->role == HCI_ROLE_MASTER)
2708 link_mode |= HCI_LM_MASTER;
2709
2710 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2711 link_mode |= HCI_LM_ENCRYPT;
2712
2713 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2714 link_mode |= HCI_LM_AUTH;
2715
2716 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2717 link_mode |= HCI_LM_SECURE;
2718
2719 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2720 link_mode |= HCI_LM_FIPS;
2721
2722 return link_mode;
2723}
2724
2725int hci_get_conn_list(void __user *arg)
2726{
2727 struct hci_conn *c;
2728 struct hci_conn_list_req req, *cl;
2729 struct hci_conn_info *ci;
2730 struct hci_dev *hdev;
2731 int n = 0, size, err;
2732
2733 if (copy_from_user(&req, arg, sizeof(req)))
2734 return -EFAULT;
2735
2736 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2737 return -EINVAL;
2738
2739 size = sizeof(req) + req.conn_num * sizeof(*ci);
2740
2741 cl = kmalloc(size, GFP_KERNEL);
2742 if (!cl)
2743 return -ENOMEM;
2744
2745 hdev = hci_dev_get(req.dev_id);
2746 if (!hdev) {
2747 kfree(cl);
2748 return -ENODEV;
2749 }
2750
2751 ci = cl->conn_info;
2752
2753 hci_dev_lock(hdev);
2754 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2755 bacpy(&(ci + n)->bdaddr, &c->dst);
2756 (ci + n)->handle = c->handle;
2757 (ci + n)->type = c->type;
2758 (ci + n)->out = c->out;
2759 (ci + n)->state = c->state;
2760 (ci + n)->link_mode = get_link_mode(c);
2761 if (++n >= req.conn_num)
2762 break;
2763 }
2764 hci_dev_unlock(hdev);
2765
2766 cl->dev_id = hdev->id;
2767 cl->conn_num = n;
2768 size = sizeof(req) + n * sizeof(*ci);
2769
2770 hci_dev_put(hdev);
2771
2772 err = copy_to_user(arg, cl, size);
2773 kfree(cl);
2774
2775 return err ? -EFAULT : 0;
2776}
2777
2778int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2779{
2780 struct hci_conn_info_req req;
2781 struct hci_conn_info ci;
2782 struct hci_conn *conn;
2783 char __user *ptr = arg + sizeof(req);
2784
2785 if (copy_from_user(&req, arg, sizeof(req)))
2786 return -EFAULT;
2787
2788 hci_dev_lock(hdev);
2789 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2790 if (conn) {
2791 bacpy(&ci.bdaddr, &conn->dst);
2792 ci.handle = conn->handle;
2793 ci.type = conn->type;
2794 ci.out = conn->out;
2795 ci.state = conn->state;
2796 ci.link_mode = get_link_mode(conn);
2797 }
2798 hci_dev_unlock(hdev);
2799
2800 if (!conn)
2801 return -ENOENT;
2802
2803 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2804}
2805
2806int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2807{
2808 struct hci_auth_info_req req;
2809 struct hci_conn *conn;
2810
2811 if (copy_from_user(&req, arg, sizeof(req)))
2812 return -EFAULT;
2813
2814 hci_dev_lock(hdev);
2815 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2816 if (conn)
2817 req.type = conn->auth_type;
2818 hci_dev_unlock(hdev);
2819
2820 if (!conn)
2821 return -ENOENT;
2822
2823 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2824}
2825
2826struct hci_chan *hci_chan_create(struct hci_conn *conn)
2827{
2828 struct hci_dev *hdev = conn->hdev;
2829 struct hci_chan *chan;
2830
2831 BT_DBG("%s hcon %p", hdev->name, conn);
2832
2833 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2834 BT_DBG("Refusing to create new hci_chan");
2835 return NULL;
2836 }
2837
2838 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2839 if (!chan)
2840 return NULL;
2841
2842 chan->conn = hci_conn_get(conn);
2843 skb_queue_head_init(&chan->data_q);
2844 chan->state = BT_CONNECTED;
2845
2846 list_add_rcu(&chan->list, &conn->chan_list);
2847
2848 return chan;
2849}
2850
2851void hci_chan_del(struct hci_chan *chan)
2852{
2853 struct hci_conn *conn = chan->conn;
2854 struct hci_dev *hdev = conn->hdev;
2855
2856 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2857
2858 list_del_rcu(&chan->list);
2859
2860 synchronize_rcu();
2861
2862 /* Prevent new hci_chan's to be created for this hci_conn */
2863 set_bit(HCI_CONN_DROP, &conn->flags);
2864
2865 hci_conn_put(conn);
2866
2867 skb_queue_purge(&chan->data_q);
2868 kfree(chan);
2869}
2870
2871void hci_chan_list_flush(struct hci_conn *conn)
2872{
2873 struct hci_chan *chan, *n;
2874
2875 BT_DBG("hcon %p", conn);
2876
2877 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2878 hci_chan_del(chan);
2879}
2880
2881static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2882 __u16 handle)
2883{
2884 struct hci_chan *hchan;
2885
2886 list_for_each_entry(hchan, &hcon->chan_list, list) {
2887 if (hchan->handle == handle)
2888 return hchan;
2889 }
2890
2891 return NULL;
2892}
2893
2894struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2895{
2896 struct hci_conn_hash *h = &hdev->conn_hash;
2897 struct hci_conn *hcon;
2898 struct hci_chan *hchan = NULL;
2899
2900 rcu_read_lock();
2901
2902 list_for_each_entry_rcu(hcon, &h->list, list) {
2903 hchan = __hci_chan_lookup_handle(hcon, handle);
2904 if (hchan)
2905 break;
2906 }
2907
2908 rcu_read_unlock();
2909
2910 return hchan;
2911}
2912
2913u32 hci_conn_get_phy(struct hci_conn *conn)
2914{
2915 u32 phys = 0;
2916
2917 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2918 * Table 6.2: Packets defined for synchronous, asynchronous, and
2919 * CPB logical transport types.
2920 */
2921 switch (conn->type) {
2922 case SCO_LINK:
2923 /* SCO logical transport (1 Mb/s):
2924 * HV1, HV2, HV3 and DV.
2925 */
2926 phys |= BT_PHY_BR_1M_1SLOT;
2927
2928 break;
2929
2930 case ACL_LINK:
2931 /* ACL logical transport (1 Mb/s) ptt=0:
2932 * DH1, DM3, DH3, DM5 and DH5.
2933 */
2934 phys |= BT_PHY_BR_1M_1SLOT;
2935
2936 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2937 phys |= BT_PHY_BR_1M_3SLOT;
2938
2939 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2940 phys |= BT_PHY_BR_1M_5SLOT;
2941
2942 /* ACL logical transport (2 Mb/s) ptt=1:
2943 * 2-DH1, 2-DH3 and 2-DH5.
2944 */
2945 if (!(conn->pkt_type & HCI_2DH1))
2946 phys |= BT_PHY_EDR_2M_1SLOT;
2947
2948 if (!(conn->pkt_type & HCI_2DH3))
2949 phys |= BT_PHY_EDR_2M_3SLOT;
2950
2951 if (!(conn->pkt_type & HCI_2DH5))
2952 phys |= BT_PHY_EDR_2M_5SLOT;
2953
2954 /* ACL logical transport (3 Mb/s) ptt=1:
2955 * 3-DH1, 3-DH3 and 3-DH5.
2956 */
2957 if (!(conn->pkt_type & HCI_3DH1))
2958 phys |= BT_PHY_EDR_3M_1SLOT;
2959
2960 if (!(conn->pkt_type & HCI_3DH3))
2961 phys |= BT_PHY_EDR_3M_3SLOT;
2962
2963 if (!(conn->pkt_type & HCI_3DH5))
2964 phys |= BT_PHY_EDR_3M_5SLOT;
2965
2966 break;
2967
2968 case ESCO_LINK:
2969 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2970 phys |= BT_PHY_BR_1M_1SLOT;
2971
2972 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2973 phys |= BT_PHY_BR_1M_3SLOT;
2974
2975 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2976 if (!(conn->pkt_type & ESCO_2EV3))
2977 phys |= BT_PHY_EDR_2M_1SLOT;
2978
2979 if (!(conn->pkt_type & ESCO_2EV5))
2980 phys |= BT_PHY_EDR_2M_3SLOT;
2981
2982 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2983 if (!(conn->pkt_type & ESCO_3EV3))
2984 phys |= BT_PHY_EDR_3M_1SLOT;
2985
2986 if (!(conn->pkt_type & ESCO_3EV5))
2987 phys |= BT_PHY_EDR_3M_3SLOT;
2988
2989 break;
2990
2991 case LE_LINK:
2992 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2993 phys |= BT_PHY_LE_1M_TX;
2994
2995 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2996 phys |= BT_PHY_LE_1M_RX;
2997
2998 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2999 phys |= BT_PHY_LE_2M_TX;
3000
3001 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
3002 phys |= BT_PHY_LE_2M_RX;
3003
3004 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
3005 phys |= BT_PHY_LE_CODED_TX;
3006
3007 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
3008 phys |= BT_PHY_LE_CODED_RX;
3009
3010 break;
3011 }
3012
3013 return phys;
3014}
3015
3016static int abort_conn_sync(struct hci_dev *hdev, void *data)
3017{
3018 struct hci_conn *conn = data;
3019
3020 if (!hci_conn_valid(hdev, conn))
3021 return -ECANCELED;
3022
3023 return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
3024}
3025
3026int hci_abort_conn(struct hci_conn *conn, u8 reason)
3027{
3028 struct hci_dev *hdev = conn->hdev;
3029
3030 /* If abort_reason has already been set it means the connection is
3031 * already being aborted so don't attempt to overwrite it.
3032 */
3033 if (conn->abort_reason)
3034 return 0;
3035
3036 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
3037
3038 conn->abort_reason = reason;
3039
3040 /* If the connection is pending check the command opcode since that
3041 * might be blocking on hci_cmd_sync_work while waiting its respective
3042 * event so we need to hci_cmd_sync_cancel to cancel it.
3043 *
3044 * hci_connect_le serializes the connection attempts so only one
3045 * connection can be in BT_CONNECT at time.
3046 */
3047 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
3048 switch (hci_skb_event(hdev->sent_cmd)) {
3049 case HCI_EV_CONN_COMPLETE:
3050 case HCI_EV_LE_CONN_COMPLETE:
3051 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
3052 case HCI_EVT_LE_CIS_ESTABLISHED:
3053 hci_cmd_sync_cancel(hdev, ECANCELED);
3054 break;
3055 }
3056 /* Cancel connect attempt if still queued/pending */
3057 } else if (!hci_cancel_connect_sync(hdev, conn)) {
3058 return 0;
3059 }
3060
3061 /* Run immediately if on cmd_sync_work since this may be called
3062 * as a result to MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR which does
3063 * already queue its callback on cmd_sync_work.
3064 */
3065 return hci_cmd_sync_run_once(hdev, abort_conn_sync, conn, NULL);
3066}
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth HCI connection handling. */
26
27#include <linux/export.h>
28#include <linux/debugfs.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32#include <net/bluetooth/l2cap.h>
33
34#include "hci_request.h"
35#include "smp.h"
36#include "a2mp.h"
37
38struct sco_param {
39 u16 pkt_type;
40 u16 max_latency;
41 u8 retrans_effort;
42};
43
44static const struct sco_param esco_param_cvsd[] = {
45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
50};
51
52static const struct sco_param sco_param_cvsd[] = {
53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
55};
56
57static const struct sco_param esco_param_msbc[] = {
58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
60};
61
62/* This function requires the caller holds hdev->lock */
63static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
64{
65 struct hci_conn_params *params;
66 struct hci_dev *hdev = conn->hdev;
67 struct smp_irk *irk;
68 bdaddr_t *bdaddr;
69 u8 bdaddr_type;
70
71 bdaddr = &conn->dst;
72 bdaddr_type = conn->dst_type;
73
74 /* Check if we need to convert to identity address */
75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
76 if (irk) {
77 bdaddr = &irk->bdaddr;
78 bdaddr_type = irk->addr_type;
79 }
80
81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
82 bdaddr_type);
83 if (!params || !params->explicit_connect)
84 return;
85
86 /* The connection attempt was doing scan for new RPA, and is
87 * in scan phase. If params are not associated with any other
88 * autoconnect action, remove them completely. If they are, just unmark
89 * them as waiting for connection, by clearing explicit_connect field.
90 */
91 params->explicit_connect = false;
92
93 list_del_init(¶ms->action);
94
95 switch (params->auto_connect) {
96 case HCI_AUTO_CONN_EXPLICIT:
97 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
98 /* return instead of break to avoid duplicate scan update */
99 return;
100 case HCI_AUTO_CONN_DIRECT:
101 case HCI_AUTO_CONN_ALWAYS:
102 list_add(¶ms->action, &hdev->pend_le_conns);
103 break;
104 case HCI_AUTO_CONN_REPORT:
105 list_add(¶ms->action, &hdev->pend_le_reports);
106 break;
107 default:
108 break;
109 }
110
111 hci_update_background_scan(hdev);
112}
113
114static void hci_conn_cleanup(struct hci_conn *conn)
115{
116 struct hci_dev *hdev = conn->hdev;
117
118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
120
121 hci_chan_list_flush(conn);
122
123 hci_conn_hash_del(hdev, conn);
124
125 if (hdev->notify)
126 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
127
128 hci_conn_del_sysfs(conn);
129
130 debugfs_remove_recursive(conn->debugfs);
131
132 hci_dev_put(hdev);
133
134 hci_conn_put(conn);
135}
136
137static void le_scan_cleanup(struct work_struct *work)
138{
139 struct hci_conn *conn = container_of(work, struct hci_conn,
140 le_scan_cleanup);
141 struct hci_dev *hdev = conn->hdev;
142 struct hci_conn *c = NULL;
143
144 BT_DBG("%s hcon %p", hdev->name, conn);
145
146 hci_dev_lock(hdev);
147
148 /* Check that the hci_conn is still around */
149 rcu_read_lock();
150 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
151 if (c == conn)
152 break;
153 }
154 rcu_read_unlock();
155
156 if (c == conn) {
157 hci_connect_le_scan_cleanup(conn);
158 hci_conn_cleanup(conn);
159 }
160
161 hci_dev_unlock(hdev);
162 hci_dev_put(hdev);
163 hci_conn_put(conn);
164}
165
166static void hci_connect_le_scan_remove(struct hci_conn *conn)
167{
168 BT_DBG("%s hcon %p", conn->hdev->name, conn);
169
170 /* We can't call hci_conn_del/hci_conn_cleanup here since that
171 * could deadlock with another hci_conn_del() call that's holding
172 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
173 * Instead, grab temporary extra references to the hci_dev and
174 * hci_conn and perform the necessary cleanup in a separate work
175 * callback.
176 */
177
178 hci_dev_hold(conn->hdev);
179 hci_conn_get(conn);
180
181 /* Even though we hold a reference to the hdev, many other
182 * things might get cleaned up meanwhile, including the hdev's
183 * own workqueue, so we can't use that for scheduling.
184 */
185 schedule_work(&conn->le_scan_cleanup);
186}
187
188static void hci_acl_create_connection(struct hci_conn *conn)
189{
190 struct hci_dev *hdev = conn->hdev;
191 struct inquiry_entry *ie;
192 struct hci_cp_create_conn cp;
193
194 BT_DBG("hcon %p", conn);
195
196 conn->state = BT_CONNECT;
197 conn->out = true;
198 conn->role = HCI_ROLE_MASTER;
199
200 conn->attempt++;
201
202 conn->link_policy = hdev->link_policy;
203
204 memset(&cp, 0, sizeof(cp));
205 bacpy(&cp.bdaddr, &conn->dst);
206 cp.pscan_rep_mode = 0x02;
207
208 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
209 if (ie) {
210 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
211 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
212 cp.pscan_mode = ie->data.pscan_mode;
213 cp.clock_offset = ie->data.clock_offset |
214 cpu_to_le16(0x8000);
215 }
216
217 memcpy(conn->dev_class, ie->data.dev_class, 3);
218 if (ie->data.ssp_mode > 0)
219 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
220 }
221
222 cp.pkt_type = cpu_to_le16(conn->pkt_type);
223 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
224 cp.role_switch = 0x01;
225 else
226 cp.role_switch = 0x00;
227
228 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
229}
230
231int hci_disconnect(struct hci_conn *conn, __u8 reason)
232{
233 BT_DBG("hcon %p", conn);
234
235 /* When we are master of an established connection and it enters
236 * the disconnect timeout, then go ahead and try to read the
237 * current clock offset. Processing of the result is done
238 * within the event handling and hci_clock_offset_evt function.
239 */
240 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
241 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
242 struct hci_dev *hdev = conn->hdev;
243 struct hci_cp_read_clock_offset clkoff_cp;
244
245 clkoff_cp.handle = cpu_to_le16(conn->handle);
246 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
247 &clkoff_cp);
248 }
249
250 return hci_abort_conn(conn, reason);
251}
252
253static void hci_add_sco(struct hci_conn *conn, __u16 handle)
254{
255 struct hci_dev *hdev = conn->hdev;
256 struct hci_cp_add_sco cp;
257
258 BT_DBG("hcon %p", conn);
259
260 conn->state = BT_CONNECT;
261 conn->out = true;
262
263 conn->attempt++;
264
265 cp.handle = cpu_to_le16(handle);
266 cp.pkt_type = cpu_to_le16(conn->pkt_type);
267
268 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
269}
270
271bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
272{
273 struct hci_dev *hdev = conn->hdev;
274 struct hci_cp_setup_sync_conn cp;
275 const struct sco_param *param;
276
277 BT_DBG("hcon %p", conn);
278
279 conn->state = BT_CONNECT;
280 conn->out = true;
281
282 conn->attempt++;
283
284 cp.handle = cpu_to_le16(handle);
285
286 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
287 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
288 cp.voice_setting = cpu_to_le16(conn->setting);
289
290 switch (conn->setting & SCO_AIRMODE_MASK) {
291 case SCO_AIRMODE_TRANSP:
292 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
293 return false;
294 param = &esco_param_msbc[conn->attempt - 1];
295 break;
296 case SCO_AIRMODE_CVSD:
297 if (lmp_esco_capable(conn->link)) {
298 if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
299 return false;
300 param = &esco_param_cvsd[conn->attempt - 1];
301 } else {
302 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
303 return false;
304 param = &sco_param_cvsd[conn->attempt - 1];
305 }
306 break;
307 default:
308 return false;
309 }
310
311 cp.retrans_effort = param->retrans_effort;
312 cp.pkt_type = __cpu_to_le16(param->pkt_type);
313 cp.max_latency = __cpu_to_le16(param->max_latency);
314
315 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
316 return false;
317
318 return true;
319}
320
321u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
322 u16 to_multiplier)
323{
324 struct hci_dev *hdev = conn->hdev;
325 struct hci_conn_params *params;
326 struct hci_cp_le_conn_update cp;
327
328 hci_dev_lock(hdev);
329
330 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
331 if (params) {
332 params->conn_min_interval = min;
333 params->conn_max_interval = max;
334 params->conn_latency = latency;
335 params->supervision_timeout = to_multiplier;
336 }
337
338 hci_dev_unlock(hdev);
339
340 memset(&cp, 0, sizeof(cp));
341 cp.handle = cpu_to_le16(conn->handle);
342 cp.conn_interval_min = cpu_to_le16(min);
343 cp.conn_interval_max = cpu_to_le16(max);
344 cp.conn_latency = cpu_to_le16(latency);
345 cp.supervision_timeout = cpu_to_le16(to_multiplier);
346 cp.min_ce_len = cpu_to_le16(0x0000);
347 cp.max_ce_len = cpu_to_le16(0x0000);
348
349 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
350
351 if (params)
352 return 0x01;
353
354 return 0x00;
355}
356
357void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
358 __u8 ltk[16], __u8 key_size)
359{
360 struct hci_dev *hdev = conn->hdev;
361 struct hci_cp_le_start_enc cp;
362
363 BT_DBG("hcon %p", conn);
364
365 memset(&cp, 0, sizeof(cp));
366
367 cp.handle = cpu_to_le16(conn->handle);
368 cp.rand = rand;
369 cp.ediv = ediv;
370 memcpy(cp.ltk, ltk, key_size);
371
372 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
373}
374
375/* Device _must_ be locked */
376void hci_sco_setup(struct hci_conn *conn, __u8 status)
377{
378 struct hci_conn *sco = conn->link;
379
380 if (!sco)
381 return;
382
383 BT_DBG("hcon %p", conn);
384
385 if (!status) {
386 if (lmp_esco_capable(conn->hdev))
387 hci_setup_sync(sco, conn->handle);
388 else
389 hci_add_sco(sco, conn->handle);
390 } else {
391 hci_connect_cfm(sco, status);
392 hci_conn_del(sco);
393 }
394}
395
396static void hci_conn_timeout(struct work_struct *work)
397{
398 struct hci_conn *conn = container_of(work, struct hci_conn,
399 disc_work.work);
400 int refcnt = atomic_read(&conn->refcnt);
401
402 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
403
404 WARN_ON(refcnt < 0);
405
406 /* FIXME: It was observed that in pairing failed scenario, refcnt
407 * drops below 0. Probably this is because l2cap_conn_del calls
408 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
409 * dropped. After that loop hci_chan_del is called which also drops
410 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
411 * otherwise drop it.
412 */
413 if (refcnt > 0)
414 return;
415
416 /* LE connections in scanning state need special handling */
417 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
418 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
419 hci_connect_le_scan_remove(conn);
420 return;
421 }
422
423 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
424}
425
426/* Enter sniff mode */
427static void hci_conn_idle(struct work_struct *work)
428{
429 struct hci_conn *conn = container_of(work, struct hci_conn,
430 idle_work.work);
431 struct hci_dev *hdev = conn->hdev;
432
433 BT_DBG("hcon %p mode %d", conn, conn->mode);
434
435 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
436 return;
437
438 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
439 return;
440
441 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
442 struct hci_cp_sniff_subrate cp;
443 cp.handle = cpu_to_le16(conn->handle);
444 cp.max_latency = cpu_to_le16(0);
445 cp.min_remote_timeout = cpu_to_le16(0);
446 cp.min_local_timeout = cpu_to_le16(0);
447 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
448 }
449
450 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
451 struct hci_cp_sniff_mode cp;
452 cp.handle = cpu_to_le16(conn->handle);
453 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
454 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
455 cp.attempt = cpu_to_le16(4);
456 cp.timeout = cpu_to_le16(1);
457 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
458 }
459}
460
461static void hci_conn_auto_accept(struct work_struct *work)
462{
463 struct hci_conn *conn = container_of(work, struct hci_conn,
464 auto_accept_work.work);
465
466 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
467 &conn->dst);
468}
469
470static void le_conn_timeout(struct work_struct *work)
471{
472 struct hci_conn *conn = container_of(work, struct hci_conn,
473 le_conn_timeout.work);
474 struct hci_dev *hdev = conn->hdev;
475
476 BT_DBG("");
477
478 /* We could end up here due to having done directed advertising,
479 * so clean up the state if necessary. This should however only
480 * happen with broken hardware or if low duty cycle was used
481 * (which doesn't have a timeout of its own).
482 */
483 if (conn->role == HCI_ROLE_SLAVE) {
484 u8 enable = 0x00;
485 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
486 &enable);
487 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
488 return;
489 }
490
491 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
492}
493
494struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
495 u8 role)
496{
497 struct hci_conn *conn;
498
499 BT_DBG("%s dst %pMR", hdev->name, dst);
500
501 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
502 if (!conn)
503 return NULL;
504
505 bacpy(&conn->dst, dst);
506 bacpy(&conn->src, &hdev->bdaddr);
507 conn->hdev = hdev;
508 conn->type = type;
509 conn->role = role;
510 conn->mode = HCI_CM_ACTIVE;
511 conn->state = BT_OPEN;
512 conn->auth_type = HCI_AT_GENERAL_BONDING;
513 conn->io_capability = hdev->io_capability;
514 conn->remote_auth = 0xff;
515 conn->key_type = 0xff;
516 conn->rssi = HCI_RSSI_INVALID;
517 conn->tx_power = HCI_TX_POWER_INVALID;
518 conn->max_tx_power = HCI_TX_POWER_INVALID;
519
520 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
521 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
522
523 if (conn->role == HCI_ROLE_MASTER)
524 conn->out = true;
525
526 switch (type) {
527 case ACL_LINK:
528 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
529 break;
530 case LE_LINK:
531 /* conn->src should reflect the local identity address */
532 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
533 break;
534 case SCO_LINK:
535 if (lmp_esco_capable(hdev))
536 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
537 (hdev->esco_type & EDR_ESCO_MASK);
538 else
539 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
540 break;
541 case ESCO_LINK:
542 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
543 break;
544 }
545
546 skb_queue_head_init(&conn->data_q);
547
548 INIT_LIST_HEAD(&conn->chan_list);
549
550 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
551 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
552 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
553 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
554 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
555
556 atomic_set(&conn->refcnt, 0);
557
558 hci_dev_hold(hdev);
559
560 hci_conn_hash_add(hdev, conn);
561 if (hdev->notify)
562 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
563
564 hci_conn_init_sysfs(conn);
565
566 return conn;
567}
568
569int hci_conn_del(struct hci_conn *conn)
570{
571 struct hci_dev *hdev = conn->hdev;
572
573 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
574
575 cancel_delayed_work_sync(&conn->disc_work);
576 cancel_delayed_work_sync(&conn->auto_accept_work);
577 cancel_delayed_work_sync(&conn->idle_work);
578
579 if (conn->type == ACL_LINK) {
580 struct hci_conn *sco = conn->link;
581 if (sco)
582 sco->link = NULL;
583
584 /* Unacked frames */
585 hdev->acl_cnt += conn->sent;
586 } else if (conn->type == LE_LINK) {
587 cancel_delayed_work(&conn->le_conn_timeout);
588
589 if (hdev->le_pkts)
590 hdev->le_cnt += conn->sent;
591 else
592 hdev->acl_cnt += conn->sent;
593 } else {
594 struct hci_conn *acl = conn->link;
595 if (acl) {
596 acl->link = NULL;
597 hci_conn_drop(acl);
598 }
599 }
600
601 if (conn->amp_mgr)
602 amp_mgr_put(conn->amp_mgr);
603
604 skb_queue_purge(&conn->data_q);
605
606 /* Remove the connection from the list and cleanup its remaining
607 * state. This is a separate function since for some cases like
608 * BT_CONNECT_SCAN we *only* want the cleanup part without the
609 * rest of hci_conn_del.
610 */
611 hci_conn_cleanup(conn);
612
613 return 0;
614}
615
616struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
617{
618 int use_src = bacmp(src, BDADDR_ANY);
619 struct hci_dev *hdev = NULL, *d;
620
621 BT_DBG("%pMR -> %pMR", src, dst);
622
623 read_lock(&hci_dev_list_lock);
624
625 list_for_each_entry(d, &hci_dev_list, list) {
626 if (!test_bit(HCI_UP, &d->flags) ||
627 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
628 d->dev_type != HCI_BREDR)
629 continue;
630
631 /* Simple routing:
632 * No source address - find interface with bdaddr != dst
633 * Source address - find interface with bdaddr == src
634 */
635
636 if (use_src) {
637 if (!bacmp(&d->bdaddr, src)) {
638 hdev = d; break;
639 }
640 } else {
641 if (bacmp(&d->bdaddr, dst)) {
642 hdev = d; break;
643 }
644 }
645 }
646
647 if (hdev)
648 hdev = hci_dev_hold(hdev);
649
650 read_unlock(&hci_dev_list_lock);
651 return hdev;
652}
653EXPORT_SYMBOL(hci_get_route);
654
655/* This function requires the caller holds hdev->lock */
656void hci_le_conn_failed(struct hci_conn *conn, u8 status)
657{
658 struct hci_dev *hdev = conn->hdev;
659 struct hci_conn_params *params;
660
661 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
662 conn->dst_type);
663 if (params && params->conn) {
664 hci_conn_drop(params->conn);
665 hci_conn_put(params->conn);
666 params->conn = NULL;
667 }
668
669 conn->state = BT_CLOSED;
670
671 /* If the status indicates successful cancellation of
672 * the attempt (i.e. Unkown Connection Id) there's no point of
673 * notifying failure since we'll go back to keep trying to
674 * connect. The only exception is explicit connect requests
675 * where a timeout + cancel does indicate an actual failure.
676 */
677 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
678 (params && params->explicit_connect))
679 mgmt_connect_failed(hdev, &conn->dst, conn->type,
680 conn->dst_type, status);
681
682 hci_connect_cfm(conn, status);
683
684 hci_conn_del(conn);
685
686 /* Since we may have temporarily stopped the background scanning in
687 * favor of connection establishment, we should restart it.
688 */
689 hci_update_background_scan(hdev);
690
691 /* Re-enable advertising in case this was a failed connection
692 * attempt as a peripheral.
693 */
694 hci_req_reenable_advertising(hdev);
695}
696
697static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
698{
699 struct hci_conn *conn;
700
701 hci_dev_lock(hdev);
702
703 conn = hci_lookup_le_connect(hdev);
704
705 if (!status) {
706 hci_connect_le_scan_cleanup(conn);
707 goto done;
708 }
709
710 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
711 status);
712
713 if (!conn)
714 goto done;
715
716 hci_le_conn_failed(conn, status);
717
718done:
719 hci_dev_unlock(hdev);
720}
721
722static bool conn_use_rpa(struct hci_conn *conn)
723{
724 struct hci_dev *hdev = conn->hdev;
725
726 return hci_dev_test_flag(hdev, HCI_PRIVACY);
727}
728
729static void hci_req_add_le_create_conn(struct hci_request *req,
730 struct hci_conn *conn)
731{
732 struct hci_cp_le_create_conn cp;
733 struct hci_dev *hdev = conn->hdev;
734 u8 own_addr_type;
735
736 /* Update random address, but set require_privacy to false so
737 * that we never connect with an non-resolvable address.
738 */
739 if (hci_update_random_address(req, false, conn_use_rpa(conn),
740 &own_addr_type))
741 return;
742
743 memset(&cp, 0, sizeof(cp));
744
745 /* Set window to be the same value as the interval to enable
746 * continuous scanning.
747 */
748 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
749 cp.scan_window = cp.scan_interval;
750
751 bacpy(&cp.peer_addr, &conn->dst);
752 cp.peer_addr_type = conn->dst_type;
753 cp.own_address_type = own_addr_type;
754 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
755 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
756 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
757 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
758 cp.min_ce_len = cpu_to_le16(0x0000);
759 cp.max_ce_len = cpu_to_le16(0x0000);
760
761 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
762
763 conn->state = BT_CONNECT;
764 clear_bit(HCI_CONN_SCANNING, &conn->flags);
765}
766
767static void hci_req_directed_advertising(struct hci_request *req,
768 struct hci_conn *conn)
769{
770 struct hci_dev *hdev = req->hdev;
771 struct hci_cp_le_set_adv_param cp;
772 u8 own_addr_type;
773 u8 enable;
774
775 /* Clear the HCI_LE_ADV bit temporarily so that the
776 * hci_update_random_address knows that it's safe to go ahead
777 * and write a new random address. The flag will be set back on
778 * as soon as the SET_ADV_ENABLE HCI command completes.
779 */
780 hci_dev_clear_flag(hdev, HCI_LE_ADV);
781
782 /* Set require_privacy to false so that the remote device has a
783 * chance of identifying us.
784 */
785 if (hci_update_random_address(req, false, conn_use_rpa(conn),
786 &own_addr_type) < 0)
787 return;
788
789 memset(&cp, 0, sizeof(cp));
790 cp.type = LE_ADV_DIRECT_IND;
791 cp.own_address_type = own_addr_type;
792 cp.direct_addr_type = conn->dst_type;
793 bacpy(&cp.direct_addr, &conn->dst);
794 cp.channel_map = hdev->le_adv_channel_map;
795
796 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
797
798 enable = 0x01;
799 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
800
801 conn->state = BT_CONNECT;
802}
803
804struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
805 u8 dst_type, u8 sec_level, u16 conn_timeout,
806 u8 role)
807{
808 struct hci_conn_params *params;
809 struct hci_conn *conn;
810 struct smp_irk *irk;
811 struct hci_request req;
812 int err;
813
814 /* Let's make sure that le is enabled.*/
815 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
816 if (lmp_le_capable(hdev))
817 return ERR_PTR(-ECONNREFUSED);
818
819 return ERR_PTR(-EOPNOTSUPP);
820 }
821
822 /* Since the controller supports only one LE connection attempt at a
823 * time, we return -EBUSY if there is any connection attempt running.
824 */
825 if (hci_lookup_le_connect(hdev))
826 return ERR_PTR(-EBUSY);
827
828 /* If there's already a connection object but it's not in
829 * scanning state it means it must already be established, in
830 * which case we can't do anything else except report a failure
831 * to connect.
832 */
833 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
834 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
835 return ERR_PTR(-EBUSY);
836 }
837
838 /* When given an identity address with existing identity
839 * resolving key, the connection needs to be established
840 * to a resolvable random address.
841 *
842 * Storing the resolvable random address is required here
843 * to handle connection failures. The address will later
844 * be resolved back into the original identity address
845 * from the connect request.
846 */
847 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
848 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
849 dst = &irk->rpa;
850 dst_type = ADDR_LE_DEV_RANDOM;
851 }
852
853 if (conn) {
854 bacpy(&conn->dst, dst);
855 } else {
856 conn = hci_conn_add(hdev, LE_LINK, dst, role);
857 if (!conn)
858 return ERR_PTR(-ENOMEM);
859 hci_conn_hold(conn);
860 conn->pending_sec_level = sec_level;
861 }
862
863 conn->dst_type = dst_type;
864 conn->sec_level = BT_SECURITY_LOW;
865 conn->conn_timeout = conn_timeout;
866
867 hci_req_init(&req, hdev);
868
869 /* Disable advertising if we're active. For master role
870 * connections most controllers will refuse to connect if
871 * advertising is enabled, and for slave role connections we
872 * anyway have to disable it in order to start directed
873 * advertising.
874 */
875 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
876 u8 enable = 0x00;
877 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
878 &enable);
879 }
880
881 /* If requested to connect as slave use directed advertising */
882 if (conn->role == HCI_ROLE_SLAVE) {
883 /* If we're active scanning most controllers are unable
884 * to initiate advertising. Simply reject the attempt.
885 */
886 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
887 hdev->le_scan_type == LE_SCAN_ACTIVE) {
888 skb_queue_purge(&req.cmd_q);
889 hci_conn_del(conn);
890 return ERR_PTR(-EBUSY);
891 }
892
893 hci_req_directed_advertising(&req, conn);
894 goto create_conn;
895 }
896
897 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
898 if (params) {
899 conn->le_conn_min_interval = params->conn_min_interval;
900 conn->le_conn_max_interval = params->conn_max_interval;
901 conn->le_conn_latency = params->conn_latency;
902 conn->le_supv_timeout = params->supervision_timeout;
903 } else {
904 conn->le_conn_min_interval = hdev->le_conn_min_interval;
905 conn->le_conn_max_interval = hdev->le_conn_max_interval;
906 conn->le_conn_latency = hdev->le_conn_latency;
907 conn->le_supv_timeout = hdev->le_supv_timeout;
908 }
909
910 /* If controller is scanning, we stop it since some controllers are
911 * not able to scan and connect at the same time. Also set the
912 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
913 * handler for scan disabling knows to set the correct discovery
914 * state.
915 */
916 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
917 hci_req_add_le_scan_disable(&req);
918 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
919 }
920
921 hci_req_add_le_create_conn(&req, conn);
922
923create_conn:
924 err = hci_req_run(&req, create_le_conn_complete);
925 if (err) {
926 hci_conn_del(conn);
927 return ERR_PTR(err);
928 }
929
930 return conn;
931}
932
933static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
934{
935 struct hci_conn *conn;
936
937 conn = hci_conn_hash_lookup_le(hdev, addr, type);
938 if (!conn)
939 return false;
940
941 if (conn->state != BT_CONNECTED)
942 return false;
943
944 return true;
945}
946
947/* This function requires the caller holds hdev->lock */
948static int hci_explicit_conn_params_set(struct hci_dev *hdev,
949 bdaddr_t *addr, u8 addr_type)
950{
951 struct hci_conn_params *params;
952
953 if (is_connected(hdev, addr, addr_type))
954 return -EISCONN;
955
956 params = hci_conn_params_lookup(hdev, addr, addr_type);
957 if (!params) {
958 params = hci_conn_params_add(hdev, addr, addr_type);
959 if (!params)
960 return -ENOMEM;
961
962 /* If we created new params, mark them to be deleted in
963 * hci_connect_le_scan_cleanup. It's different case than
964 * existing disabled params, those will stay after cleanup.
965 */
966 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
967 }
968
969 /* We're trying to connect, so make sure params are at pend_le_conns */
970 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
971 params->auto_connect == HCI_AUTO_CONN_REPORT ||
972 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
973 list_del_init(¶ms->action);
974 list_add(¶ms->action, &hdev->pend_le_conns);
975 }
976
977 params->explicit_connect = true;
978
979 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
980 params->auto_connect);
981
982 return 0;
983}
984
985/* This function requires the caller holds hdev->lock */
986struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
987 u8 dst_type, u8 sec_level,
988 u16 conn_timeout)
989{
990 struct hci_conn *conn;
991
992 /* Let's make sure that le is enabled.*/
993 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
994 if (lmp_le_capable(hdev))
995 return ERR_PTR(-ECONNREFUSED);
996
997 return ERR_PTR(-EOPNOTSUPP);
998 }
999
1000 /* Some devices send ATT messages as soon as the physical link is
1001 * established. To be able to handle these ATT messages, the user-
1002 * space first establishes the connection and then starts the pairing
1003 * process.
1004 *
1005 * So if a hci_conn object already exists for the following connection
1006 * attempt, we simply update pending_sec_level and auth_type fields
1007 * and return the object found.
1008 */
1009 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1010 if (conn) {
1011 if (conn->pending_sec_level < sec_level)
1012 conn->pending_sec_level = sec_level;
1013 goto done;
1014 }
1015
1016 BT_DBG("requesting refresh of dst_addr");
1017
1018 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1019 if (!conn)
1020 return ERR_PTR(-ENOMEM);
1021
1022 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1023 return ERR_PTR(-EBUSY);
1024
1025 conn->state = BT_CONNECT;
1026 set_bit(HCI_CONN_SCANNING, &conn->flags);
1027 conn->dst_type = dst_type;
1028 conn->sec_level = BT_SECURITY_LOW;
1029 conn->pending_sec_level = sec_level;
1030 conn->conn_timeout = conn_timeout;
1031
1032 hci_update_background_scan(hdev);
1033
1034done:
1035 hci_conn_hold(conn);
1036 return conn;
1037}
1038
1039struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1040 u8 sec_level, u8 auth_type)
1041{
1042 struct hci_conn *acl;
1043
1044 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1045 if (lmp_bredr_capable(hdev))
1046 return ERR_PTR(-ECONNREFUSED);
1047
1048 return ERR_PTR(-EOPNOTSUPP);
1049 }
1050
1051 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1052 if (!acl) {
1053 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1054 if (!acl)
1055 return ERR_PTR(-ENOMEM);
1056 }
1057
1058 hci_conn_hold(acl);
1059
1060 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1061 acl->sec_level = BT_SECURITY_LOW;
1062 acl->pending_sec_level = sec_level;
1063 acl->auth_type = auth_type;
1064 hci_acl_create_connection(acl);
1065 }
1066
1067 return acl;
1068}
1069
1070struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1071 __u16 setting)
1072{
1073 struct hci_conn *acl;
1074 struct hci_conn *sco;
1075
1076 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1077 if (IS_ERR(acl))
1078 return acl;
1079
1080 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1081 if (!sco) {
1082 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1083 if (!sco) {
1084 hci_conn_drop(acl);
1085 return ERR_PTR(-ENOMEM);
1086 }
1087 }
1088
1089 acl->link = sco;
1090 sco->link = acl;
1091
1092 hci_conn_hold(sco);
1093
1094 sco->setting = setting;
1095
1096 if (acl->state == BT_CONNECTED &&
1097 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1098 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1099 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1100
1101 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1102 /* defer SCO setup until mode change completed */
1103 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1104 return sco;
1105 }
1106
1107 hci_sco_setup(acl, 0x00);
1108 }
1109
1110 return sco;
1111}
1112
1113/* Check link security requirement */
1114int hci_conn_check_link_mode(struct hci_conn *conn)
1115{
1116 BT_DBG("hcon %p", conn);
1117
1118 /* In Secure Connections Only mode, it is required that Secure
1119 * Connections is used and the link is encrypted with AES-CCM
1120 * using a P-256 authenticated combination key.
1121 */
1122 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1123 if (!hci_conn_sc_enabled(conn) ||
1124 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1125 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1126 return 0;
1127 }
1128
1129 if (hci_conn_ssp_enabled(conn) &&
1130 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1131 return 0;
1132
1133 return 1;
1134}
1135
1136/* Authenticate remote device */
1137static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1138{
1139 BT_DBG("hcon %p", conn);
1140
1141 if (conn->pending_sec_level > sec_level)
1142 sec_level = conn->pending_sec_level;
1143
1144 if (sec_level > conn->sec_level)
1145 conn->pending_sec_level = sec_level;
1146 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1147 return 1;
1148
1149 /* Make sure we preserve an existing MITM requirement*/
1150 auth_type |= (conn->auth_type & 0x01);
1151
1152 conn->auth_type = auth_type;
1153
1154 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1155 struct hci_cp_auth_requested cp;
1156
1157 cp.handle = cpu_to_le16(conn->handle);
1158 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1159 sizeof(cp), &cp);
1160
1161 /* If we're already encrypted set the REAUTH_PEND flag,
1162 * otherwise set the ENCRYPT_PEND.
1163 */
1164 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1165 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1166 else
1167 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1168 }
1169
1170 return 0;
1171}
1172
1173/* Encrypt the the link */
1174static void hci_conn_encrypt(struct hci_conn *conn)
1175{
1176 BT_DBG("hcon %p", conn);
1177
1178 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1179 struct hci_cp_set_conn_encrypt cp;
1180 cp.handle = cpu_to_le16(conn->handle);
1181 cp.encrypt = 0x01;
1182 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1183 &cp);
1184 }
1185}
1186
1187/* Enable security */
1188int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1189 bool initiator)
1190{
1191 BT_DBG("hcon %p", conn);
1192
1193 if (conn->type == LE_LINK)
1194 return smp_conn_security(conn, sec_level);
1195
1196 /* For sdp we don't need the link key. */
1197 if (sec_level == BT_SECURITY_SDP)
1198 return 1;
1199
1200 /* For non 2.1 devices and low security level we don't need the link
1201 key. */
1202 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1203 return 1;
1204
1205 /* For other security levels we need the link key. */
1206 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1207 goto auth;
1208
1209 /* An authenticated FIPS approved combination key has sufficient
1210 * security for security level 4. */
1211 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1212 sec_level == BT_SECURITY_FIPS)
1213 goto encrypt;
1214
1215 /* An authenticated combination key has sufficient security for
1216 security level 3. */
1217 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1218 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1219 sec_level == BT_SECURITY_HIGH)
1220 goto encrypt;
1221
1222 /* An unauthenticated combination key has sufficient security for
1223 security level 1 and 2. */
1224 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1225 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1226 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1227 goto encrypt;
1228
1229 /* A combination key has always sufficient security for the security
1230 levels 1 or 2. High security level requires the combination key
1231 is generated using maximum PIN code length (16).
1232 For pre 2.1 units. */
1233 if (conn->key_type == HCI_LK_COMBINATION &&
1234 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1235 conn->pin_length == 16))
1236 goto encrypt;
1237
1238auth:
1239 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1240 return 0;
1241
1242 if (initiator)
1243 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1244
1245 if (!hci_conn_auth(conn, sec_level, auth_type))
1246 return 0;
1247
1248encrypt:
1249 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1250 return 1;
1251
1252 hci_conn_encrypt(conn);
1253 return 0;
1254}
1255EXPORT_SYMBOL(hci_conn_security);
1256
1257/* Check secure link requirement */
1258int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1259{
1260 BT_DBG("hcon %p", conn);
1261
1262 /* Accept if non-secure or higher security level is required */
1263 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1264 return 1;
1265
1266 /* Accept if secure or higher security level is already present */
1267 if (conn->sec_level == BT_SECURITY_HIGH ||
1268 conn->sec_level == BT_SECURITY_FIPS)
1269 return 1;
1270
1271 /* Reject not secure link */
1272 return 0;
1273}
1274EXPORT_SYMBOL(hci_conn_check_secure);
1275
1276/* Switch role */
1277int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1278{
1279 BT_DBG("hcon %p", conn);
1280
1281 if (role == conn->role)
1282 return 1;
1283
1284 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1285 struct hci_cp_switch_role cp;
1286 bacpy(&cp.bdaddr, &conn->dst);
1287 cp.role = role;
1288 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1289 }
1290
1291 return 0;
1292}
1293EXPORT_SYMBOL(hci_conn_switch_role);
1294
1295/* Enter active mode */
1296void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1297{
1298 struct hci_dev *hdev = conn->hdev;
1299
1300 BT_DBG("hcon %p mode %d", conn, conn->mode);
1301
1302 if (conn->mode != HCI_CM_SNIFF)
1303 goto timer;
1304
1305 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1306 goto timer;
1307
1308 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1309 struct hci_cp_exit_sniff_mode cp;
1310 cp.handle = cpu_to_le16(conn->handle);
1311 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1312 }
1313
1314timer:
1315 if (hdev->idle_timeout > 0)
1316 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1317 msecs_to_jiffies(hdev->idle_timeout));
1318}
1319
1320/* Drop all connection on the device */
1321void hci_conn_hash_flush(struct hci_dev *hdev)
1322{
1323 struct hci_conn_hash *h = &hdev->conn_hash;
1324 struct hci_conn *c, *n;
1325
1326 BT_DBG("hdev %s", hdev->name);
1327
1328 list_for_each_entry_safe(c, n, &h->list, list) {
1329 c->state = BT_CLOSED;
1330
1331 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1332 hci_conn_del(c);
1333 }
1334}
1335
1336/* Check pending connect attempts */
1337void hci_conn_check_pending(struct hci_dev *hdev)
1338{
1339 struct hci_conn *conn;
1340
1341 BT_DBG("hdev %s", hdev->name);
1342
1343 hci_dev_lock(hdev);
1344
1345 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1346 if (conn)
1347 hci_acl_create_connection(conn);
1348
1349 hci_dev_unlock(hdev);
1350}
1351
1352static u32 get_link_mode(struct hci_conn *conn)
1353{
1354 u32 link_mode = 0;
1355
1356 if (conn->role == HCI_ROLE_MASTER)
1357 link_mode |= HCI_LM_MASTER;
1358
1359 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1360 link_mode |= HCI_LM_ENCRYPT;
1361
1362 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1363 link_mode |= HCI_LM_AUTH;
1364
1365 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1366 link_mode |= HCI_LM_SECURE;
1367
1368 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1369 link_mode |= HCI_LM_FIPS;
1370
1371 return link_mode;
1372}
1373
1374int hci_get_conn_list(void __user *arg)
1375{
1376 struct hci_conn *c;
1377 struct hci_conn_list_req req, *cl;
1378 struct hci_conn_info *ci;
1379 struct hci_dev *hdev;
1380 int n = 0, size, err;
1381
1382 if (copy_from_user(&req, arg, sizeof(req)))
1383 return -EFAULT;
1384
1385 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1386 return -EINVAL;
1387
1388 size = sizeof(req) + req.conn_num * sizeof(*ci);
1389
1390 cl = kmalloc(size, GFP_KERNEL);
1391 if (!cl)
1392 return -ENOMEM;
1393
1394 hdev = hci_dev_get(req.dev_id);
1395 if (!hdev) {
1396 kfree(cl);
1397 return -ENODEV;
1398 }
1399
1400 ci = cl->conn_info;
1401
1402 hci_dev_lock(hdev);
1403 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1404 bacpy(&(ci + n)->bdaddr, &c->dst);
1405 (ci + n)->handle = c->handle;
1406 (ci + n)->type = c->type;
1407 (ci + n)->out = c->out;
1408 (ci + n)->state = c->state;
1409 (ci + n)->link_mode = get_link_mode(c);
1410 if (++n >= req.conn_num)
1411 break;
1412 }
1413 hci_dev_unlock(hdev);
1414
1415 cl->dev_id = hdev->id;
1416 cl->conn_num = n;
1417 size = sizeof(req) + n * sizeof(*ci);
1418
1419 hci_dev_put(hdev);
1420
1421 err = copy_to_user(arg, cl, size);
1422 kfree(cl);
1423
1424 return err ? -EFAULT : 0;
1425}
1426
1427int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1428{
1429 struct hci_conn_info_req req;
1430 struct hci_conn_info ci;
1431 struct hci_conn *conn;
1432 char __user *ptr = arg + sizeof(req);
1433
1434 if (copy_from_user(&req, arg, sizeof(req)))
1435 return -EFAULT;
1436
1437 hci_dev_lock(hdev);
1438 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1439 if (conn) {
1440 bacpy(&ci.bdaddr, &conn->dst);
1441 ci.handle = conn->handle;
1442 ci.type = conn->type;
1443 ci.out = conn->out;
1444 ci.state = conn->state;
1445 ci.link_mode = get_link_mode(conn);
1446 }
1447 hci_dev_unlock(hdev);
1448
1449 if (!conn)
1450 return -ENOENT;
1451
1452 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1453}
1454
1455int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1456{
1457 struct hci_auth_info_req req;
1458 struct hci_conn *conn;
1459
1460 if (copy_from_user(&req, arg, sizeof(req)))
1461 return -EFAULT;
1462
1463 hci_dev_lock(hdev);
1464 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1465 if (conn)
1466 req.type = conn->auth_type;
1467 hci_dev_unlock(hdev);
1468
1469 if (!conn)
1470 return -ENOENT;
1471
1472 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1473}
1474
1475struct hci_chan *hci_chan_create(struct hci_conn *conn)
1476{
1477 struct hci_dev *hdev = conn->hdev;
1478 struct hci_chan *chan;
1479
1480 BT_DBG("%s hcon %p", hdev->name, conn);
1481
1482 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1483 BT_DBG("Refusing to create new hci_chan");
1484 return NULL;
1485 }
1486
1487 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1488 if (!chan)
1489 return NULL;
1490
1491 chan->conn = hci_conn_get(conn);
1492 skb_queue_head_init(&chan->data_q);
1493 chan->state = BT_CONNECTED;
1494
1495 list_add_rcu(&chan->list, &conn->chan_list);
1496
1497 return chan;
1498}
1499
1500void hci_chan_del(struct hci_chan *chan)
1501{
1502 struct hci_conn *conn = chan->conn;
1503 struct hci_dev *hdev = conn->hdev;
1504
1505 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1506
1507 list_del_rcu(&chan->list);
1508
1509 synchronize_rcu();
1510
1511 /* Prevent new hci_chan's to be created for this hci_conn */
1512 set_bit(HCI_CONN_DROP, &conn->flags);
1513
1514 hci_conn_put(conn);
1515
1516 skb_queue_purge(&chan->data_q);
1517 kfree(chan);
1518}
1519
1520void hci_chan_list_flush(struct hci_conn *conn)
1521{
1522 struct hci_chan *chan, *n;
1523
1524 BT_DBG("hcon %p", conn);
1525
1526 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1527 hci_chan_del(chan);
1528}
1529
1530static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1531 __u16 handle)
1532{
1533 struct hci_chan *hchan;
1534
1535 list_for_each_entry(hchan, &hcon->chan_list, list) {
1536 if (hchan->handle == handle)
1537 return hchan;
1538 }
1539
1540 return NULL;
1541}
1542
1543struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1544{
1545 struct hci_conn_hash *h = &hdev->conn_hash;
1546 struct hci_conn *hcon;
1547 struct hci_chan *hchan = NULL;
1548
1549 rcu_read_lock();
1550
1551 list_for_each_entry_rcu(hcon, &h->list, list) {
1552 hchan = __hci_chan_lookup_handle(hcon, handle);
1553 if (hchan)
1554 break;
1555 }
1556
1557 rcu_read_unlock();
1558
1559 return hchan;
1560}