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Merge tag 'mm-hotfixes-stable-2025-07-11-16-16' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-block.git] / net / bluetooth / hci_conn.c
... / ...
CommitLineData
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#include <linux/errqueue.h>
31
32#include <net/bluetooth/bluetooth.h>
33#include <net/bluetooth/hci_core.h>
34#include <net/bluetooth/l2cap.h>
35#include <net/bluetooth/iso.h>
36#include <net/bluetooth/mgmt.h>
37
38#include "smp.h"
39#include "eir.h"
40
41struct sco_param {
42 u16 pkt_type;
43 u16 max_latency;
44 u8 retrans_effort;
45};
46
47struct conn_handle_t {
48 struct hci_conn *conn;
49 __u16 handle;
50};
51
52static const struct sco_param esco_param_cvsd[] = {
53 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
54 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
55 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
56 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
57 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
58};
59
60static const struct sco_param sco_param_cvsd[] = {
61 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
62 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
63};
64
65static const struct sco_param esco_param_msbc[] = {
66 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
67 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
68};
69
70/* This function requires the caller holds hdev->lock */
71void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
72{
73 struct hci_conn_params *params;
74 struct hci_dev *hdev = conn->hdev;
75 struct smp_irk *irk;
76 bdaddr_t *bdaddr;
77 u8 bdaddr_type;
78
79 bdaddr = &conn->dst;
80 bdaddr_type = conn->dst_type;
81
82 /* Check if we need to convert to identity address */
83 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
84 if (irk) {
85 bdaddr = &irk->bdaddr;
86 bdaddr_type = irk->addr_type;
87 }
88
89 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
90 bdaddr_type);
91 if (!params)
92 return;
93
94 if (params->conn) {
95 hci_conn_drop(params->conn);
96 hci_conn_put(params->conn);
97 params->conn = NULL;
98 }
99
100 if (!params->explicit_connect)
101 return;
102
103 /* If the status indicates successful cancellation of
104 * the attempt (i.e. Unknown Connection Id) there's no point of
105 * notifying failure since we'll go back to keep trying to
106 * connect. The only exception is explicit connect requests
107 * where a timeout + cancel does indicate an actual failure.
108 */
109 if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
110 mgmt_connect_failed(hdev, conn, status);
111
112 /* The connection attempt was doing scan for new RPA, and is
113 * in scan phase. If params are not associated with any other
114 * autoconnect action, remove them completely. If they are, just unmark
115 * them as waiting for connection, by clearing explicit_connect field.
116 */
117 params->explicit_connect = false;
118
119 hci_pend_le_list_del_init(params);
120
121 switch (params->auto_connect) {
122 case HCI_AUTO_CONN_EXPLICIT:
123 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
124 /* return instead of break to avoid duplicate scan update */
125 return;
126 case HCI_AUTO_CONN_DIRECT:
127 case HCI_AUTO_CONN_ALWAYS:
128 hci_pend_le_list_add(params, &hdev->pend_le_conns);
129 break;
130 case HCI_AUTO_CONN_REPORT:
131 hci_pend_le_list_add(params, &hdev->pend_le_reports);
132 break;
133 default:
134 break;
135 }
136
137 hci_update_passive_scan(hdev);
138}
139
140static void hci_conn_cleanup(struct hci_conn *conn)
141{
142 struct hci_dev *hdev = conn->hdev;
143
144 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
145 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
146
147 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
148 hci_remove_link_key(hdev, &conn->dst);
149
150 hci_chan_list_flush(conn);
151
152 hci_conn_hash_del(hdev, conn);
153
154 if (HCI_CONN_HANDLE_UNSET(conn->handle))
155 ida_free(&hdev->unset_handle_ida, conn->handle);
156
157 if (conn->cleanup)
158 conn->cleanup(conn);
159
160 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
161 switch (conn->setting & SCO_AIRMODE_MASK) {
162 case SCO_AIRMODE_CVSD:
163 case SCO_AIRMODE_TRANSP:
164 if (hdev->notify)
165 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
166 break;
167 }
168 } else {
169 if (hdev->notify)
170 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
171 }
172
173 debugfs_remove_recursive(conn->debugfs);
174
175 hci_conn_del_sysfs(conn);
176
177 hci_dev_put(hdev);
178}
179
180int hci_disconnect(struct hci_conn *conn, __u8 reason)
181{
182 BT_DBG("hcon %p", conn);
183
184 /* When we are central of an established connection and it enters
185 * the disconnect timeout, then go ahead and try to read the
186 * current clock offset. Processing of the result is done
187 * within the event handling and hci_clock_offset_evt function.
188 */
189 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
190 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
191 struct hci_dev *hdev = conn->hdev;
192 struct hci_cp_read_clock_offset clkoff_cp;
193
194 clkoff_cp.handle = cpu_to_le16(conn->handle);
195 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
196 &clkoff_cp);
197 }
198
199 return hci_abort_conn(conn, reason);
200}
201
202static void hci_add_sco(struct hci_conn *conn, __u16 handle)
203{
204 struct hci_dev *hdev = conn->hdev;
205 struct hci_cp_add_sco cp;
206
207 BT_DBG("hcon %p", conn);
208
209 conn->state = BT_CONNECT;
210 conn->out = true;
211
212 conn->attempt++;
213
214 cp.handle = cpu_to_le16(handle);
215 cp.pkt_type = cpu_to_le16(conn->pkt_type);
216
217 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
218}
219
220static bool find_next_esco_param(struct hci_conn *conn,
221 const struct sco_param *esco_param, int size)
222{
223 if (!conn->parent)
224 return false;
225
226 for (; conn->attempt <= size; conn->attempt++) {
227 if (lmp_esco_2m_capable(conn->parent) ||
228 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
229 break;
230 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
231 conn, conn->attempt);
232 }
233
234 return conn->attempt <= size;
235}
236
237static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
238{
239 int err;
240 __u8 vnd_len, *vnd_data = NULL;
241 struct hci_op_configure_data_path *cmd = NULL;
242
243 /* Do not take below 2 checks as error since the 1st means user do not
244 * want to use HFP offload mode and the 2nd means the vendor controller
245 * do not need to send below HCI command for offload mode.
246 */
247 if (!codec->data_path || !hdev->get_codec_config_data)
248 return 0;
249
250 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
251 &vnd_data);
252 if (err < 0)
253 goto error;
254
255 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
256 if (!cmd) {
257 err = -ENOMEM;
258 goto error;
259 }
260
261 err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
262 if (err < 0)
263 goto error;
264
265 cmd->vnd_len = vnd_len;
266 memcpy(cmd->vnd_data, vnd_data, vnd_len);
267
268 cmd->direction = 0x00;
269 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
270 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
271
272 cmd->direction = 0x01;
273 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
274 sizeof(*cmd) + vnd_len, cmd,
275 HCI_CMD_TIMEOUT);
276error:
277
278 kfree(cmd);
279 kfree(vnd_data);
280 return err;
281}
282
283static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
284{
285 struct conn_handle_t *conn_handle = data;
286 struct hci_conn *conn = conn_handle->conn;
287 __u16 handle = conn_handle->handle;
288 struct hci_cp_enhanced_setup_sync_conn cp;
289 const struct sco_param *param;
290
291 kfree(conn_handle);
292
293 if (!hci_conn_valid(hdev, conn))
294 return -ECANCELED;
295
296 bt_dev_dbg(hdev, "hcon %p", conn);
297
298 configure_datapath_sync(hdev, &conn->codec);
299
300 conn->state = BT_CONNECT;
301 conn->out = true;
302
303 conn->attempt++;
304
305 memset(&cp, 0x00, sizeof(cp));
306
307 cp.handle = cpu_to_le16(handle);
308
309 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
310 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
311
312 switch (conn->codec.id) {
313 case BT_CODEC_MSBC:
314 if (!find_next_esco_param(conn, esco_param_msbc,
315 ARRAY_SIZE(esco_param_msbc)))
316 return -EINVAL;
317
318 param = &esco_param_msbc[conn->attempt - 1];
319 cp.tx_coding_format.id = 0x05;
320 cp.rx_coding_format.id = 0x05;
321 cp.tx_codec_frame_size = __cpu_to_le16(60);
322 cp.rx_codec_frame_size = __cpu_to_le16(60);
323 cp.in_bandwidth = __cpu_to_le32(32000);
324 cp.out_bandwidth = __cpu_to_le32(32000);
325 cp.in_coding_format.id = 0x04;
326 cp.out_coding_format.id = 0x04;
327 cp.in_coded_data_size = __cpu_to_le16(16);
328 cp.out_coded_data_size = __cpu_to_le16(16);
329 cp.in_pcm_data_format = 2;
330 cp.out_pcm_data_format = 2;
331 cp.in_pcm_sample_payload_msb_pos = 0;
332 cp.out_pcm_sample_payload_msb_pos = 0;
333 cp.in_data_path = conn->codec.data_path;
334 cp.out_data_path = conn->codec.data_path;
335 cp.in_transport_unit_size = 1;
336 cp.out_transport_unit_size = 1;
337 break;
338
339 case BT_CODEC_TRANSPARENT:
340 if (!find_next_esco_param(conn, esco_param_msbc,
341 ARRAY_SIZE(esco_param_msbc)))
342 return false;
343 param = &esco_param_msbc[conn->attempt - 1];
344 cp.tx_coding_format.id = 0x03;
345 cp.rx_coding_format.id = 0x03;
346 cp.tx_codec_frame_size = __cpu_to_le16(60);
347 cp.rx_codec_frame_size = __cpu_to_le16(60);
348 cp.in_bandwidth = __cpu_to_le32(0x1f40);
349 cp.out_bandwidth = __cpu_to_le32(0x1f40);
350 cp.in_coding_format.id = 0x03;
351 cp.out_coding_format.id = 0x03;
352 cp.in_coded_data_size = __cpu_to_le16(16);
353 cp.out_coded_data_size = __cpu_to_le16(16);
354 cp.in_pcm_data_format = 2;
355 cp.out_pcm_data_format = 2;
356 cp.in_pcm_sample_payload_msb_pos = 0;
357 cp.out_pcm_sample_payload_msb_pos = 0;
358 cp.in_data_path = conn->codec.data_path;
359 cp.out_data_path = conn->codec.data_path;
360 cp.in_transport_unit_size = 1;
361 cp.out_transport_unit_size = 1;
362 break;
363
364 case BT_CODEC_CVSD:
365 if (conn->parent && lmp_esco_capable(conn->parent)) {
366 if (!find_next_esco_param(conn, esco_param_cvsd,
367 ARRAY_SIZE(esco_param_cvsd)))
368 return -EINVAL;
369 param = &esco_param_cvsd[conn->attempt - 1];
370 } else {
371 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
372 return -EINVAL;
373 param = &sco_param_cvsd[conn->attempt - 1];
374 }
375 cp.tx_coding_format.id = 2;
376 cp.rx_coding_format.id = 2;
377 cp.tx_codec_frame_size = __cpu_to_le16(60);
378 cp.rx_codec_frame_size = __cpu_to_le16(60);
379 cp.in_bandwidth = __cpu_to_le32(16000);
380 cp.out_bandwidth = __cpu_to_le32(16000);
381 cp.in_coding_format.id = 4;
382 cp.out_coding_format.id = 4;
383 cp.in_coded_data_size = __cpu_to_le16(16);
384 cp.out_coded_data_size = __cpu_to_le16(16);
385 cp.in_pcm_data_format = 2;
386 cp.out_pcm_data_format = 2;
387 cp.in_pcm_sample_payload_msb_pos = 0;
388 cp.out_pcm_sample_payload_msb_pos = 0;
389 cp.in_data_path = conn->codec.data_path;
390 cp.out_data_path = conn->codec.data_path;
391 cp.in_transport_unit_size = 16;
392 cp.out_transport_unit_size = 16;
393 break;
394 default:
395 return -EINVAL;
396 }
397
398 cp.retrans_effort = param->retrans_effort;
399 cp.pkt_type = __cpu_to_le16(param->pkt_type);
400 cp.max_latency = __cpu_to_le16(param->max_latency);
401
402 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
403 return -EIO;
404
405 return 0;
406}
407
408static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
409{
410 struct hci_dev *hdev = conn->hdev;
411 struct hci_cp_setup_sync_conn cp;
412 const struct sco_param *param;
413
414 bt_dev_dbg(hdev, "hcon %p", conn);
415
416 conn->state = BT_CONNECT;
417 conn->out = true;
418
419 conn->attempt++;
420
421 cp.handle = cpu_to_le16(handle);
422
423 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
424 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
425 cp.voice_setting = cpu_to_le16(conn->setting);
426
427 switch (conn->setting & SCO_AIRMODE_MASK) {
428 case SCO_AIRMODE_TRANSP:
429 if (!find_next_esco_param(conn, esco_param_msbc,
430 ARRAY_SIZE(esco_param_msbc)))
431 return false;
432 param = &esco_param_msbc[conn->attempt - 1];
433 break;
434 case SCO_AIRMODE_CVSD:
435 if (conn->parent && lmp_esco_capable(conn->parent)) {
436 if (!find_next_esco_param(conn, esco_param_cvsd,
437 ARRAY_SIZE(esco_param_cvsd)))
438 return false;
439 param = &esco_param_cvsd[conn->attempt - 1];
440 } else {
441 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
442 return false;
443 param = &sco_param_cvsd[conn->attempt - 1];
444 }
445 break;
446 default:
447 return false;
448 }
449
450 cp.retrans_effort = param->retrans_effort;
451 cp.pkt_type = __cpu_to_le16(param->pkt_type);
452 cp.max_latency = __cpu_to_le16(param->max_latency);
453
454 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
455 return false;
456
457 return true;
458}
459
460bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
461{
462 int result;
463 struct conn_handle_t *conn_handle;
464
465 if (enhanced_sync_conn_capable(conn->hdev)) {
466 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
467
468 if (!conn_handle)
469 return false;
470
471 conn_handle->conn = conn;
472 conn_handle->handle = handle;
473 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
474 conn_handle, NULL);
475 if (result < 0)
476 kfree(conn_handle);
477
478 return result == 0;
479 }
480
481 return hci_setup_sync_conn(conn, handle);
482}
483
484u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
485 u16 to_multiplier)
486{
487 struct hci_dev *hdev = conn->hdev;
488 struct hci_conn_params *params;
489 struct hci_cp_le_conn_update cp;
490
491 hci_dev_lock(hdev);
492
493 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
494 if (params) {
495 params->conn_min_interval = min;
496 params->conn_max_interval = max;
497 params->conn_latency = latency;
498 params->supervision_timeout = to_multiplier;
499 }
500
501 hci_dev_unlock(hdev);
502
503 memset(&cp, 0, sizeof(cp));
504 cp.handle = cpu_to_le16(conn->handle);
505 cp.conn_interval_min = cpu_to_le16(min);
506 cp.conn_interval_max = cpu_to_le16(max);
507 cp.conn_latency = cpu_to_le16(latency);
508 cp.supervision_timeout = cpu_to_le16(to_multiplier);
509 cp.min_ce_len = cpu_to_le16(0x0000);
510 cp.max_ce_len = cpu_to_le16(0x0000);
511
512 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
513
514 if (params)
515 return 0x01;
516
517 return 0x00;
518}
519
520void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
521 __u8 ltk[16], __u8 key_size)
522{
523 struct hci_dev *hdev = conn->hdev;
524 struct hci_cp_le_start_enc cp;
525
526 BT_DBG("hcon %p", conn);
527
528 memset(&cp, 0, sizeof(cp));
529
530 cp.handle = cpu_to_le16(conn->handle);
531 cp.rand = rand;
532 cp.ediv = ediv;
533 memcpy(cp.ltk, ltk, key_size);
534
535 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
536}
537
538/* Device _must_ be locked */
539void hci_sco_setup(struct hci_conn *conn, __u8 status)
540{
541 struct hci_link *link;
542
543 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
544 if (!link || !link->conn)
545 return;
546
547 BT_DBG("hcon %p", conn);
548
549 if (!status) {
550 if (lmp_esco_capable(conn->hdev))
551 hci_setup_sync(link->conn, conn->handle);
552 else
553 hci_add_sco(link->conn, conn->handle);
554 } else {
555 hci_connect_cfm(link->conn, status);
556 hci_conn_del(link->conn);
557 }
558}
559
560static void hci_conn_timeout(struct work_struct *work)
561{
562 struct hci_conn *conn = container_of(work, struct hci_conn,
563 disc_work.work);
564 int refcnt = atomic_read(&conn->refcnt);
565
566 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
567
568 WARN_ON(refcnt < 0);
569
570 /* FIXME: It was observed that in pairing failed scenario, refcnt
571 * drops below 0. Probably this is because l2cap_conn_del calls
572 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
573 * dropped. After that loop hci_chan_del is called which also drops
574 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
575 * otherwise drop it.
576 */
577 if (refcnt > 0)
578 return;
579
580 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
581}
582
583/* Enter sniff mode */
584static void hci_conn_idle(struct work_struct *work)
585{
586 struct hci_conn *conn = container_of(work, struct hci_conn,
587 idle_work.work);
588 struct hci_dev *hdev = conn->hdev;
589
590 BT_DBG("hcon %p mode %d", conn, conn->mode);
591
592 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
593 return;
594
595 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
596 return;
597
598 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
599 struct hci_cp_sniff_subrate cp;
600 cp.handle = cpu_to_le16(conn->handle);
601 cp.max_latency = cpu_to_le16(0);
602 cp.min_remote_timeout = cpu_to_le16(0);
603 cp.min_local_timeout = cpu_to_le16(0);
604 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
605 }
606
607 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
608 struct hci_cp_sniff_mode cp;
609 cp.handle = cpu_to_le16(conn->handle);
610 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
611 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
612 cp.attempt = cpu_to_le16(4);
613 cp.timeout = cpu_to_le16(1);
614 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
615 }
616}
617
618static void hci_conn_auto_accept(struct work_struct *work)
619{
620 struct hci_conn *conn = container_of(work, struct hci_conn,
621 auto_accept_work.work);
622
623 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
624 &conn->dst);
625}
626
627static void le_disable_advertising(struct hci_dev *hdev)
628{
629 if (ext_adv_capable(hdev)) {
630 struct hci_cp_le_set_ext_adv_enable cp;
631
632 cp.enable = 0x00;
633 cp.num_of_sets = 0x00;
634
635 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
636 &cp);
637 } else {
638 u8 enable = 0x00;
639 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
640 &enable);
641 }
642}
643
644static void le_conn_timeout(struct work_struct *work)
645{
646 struct hci_conn *conn = container_of(work, struct hci_conn,
647 le_conn_timeout.work);
648 struct hci_dev *hdev = conn->hdev;
649
650 BT_DBG("");
651
652 /* We could end up here due to having done directed advertising,
653 * so clean up the state if necessary. This should however only
654 * happen with broken hardware or if low duty cycle was used
655 * (which doesn't have a timeout of its own).
656 */
657 if (conn->role == HCI_ROLE_SLAVE) {
658 /* Disable LE Advertising */
659 le_disable_advertising(hdev);
660 hci_dev_lock(hdev);
661 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
662 hci_dev_unlock(hdev);
663 return;
664 }
665
666 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
667}
668
669struct iso_list_data {
670 union {
671 u8 cig;
672 u8 big;
673 };
674 union {
675 u8 cis;
676 u8 bis;
677 u16 sync_handle;
678 };
679 int count;
680 bool big_term;
681 bool pa_sync_term;
682 bool big_sync_term;
683};
684
685static void bis_list(struct hci_conn *conn, void *data)
686{
687 struct iso_list_data *d = data;
688
689 /* Skip if not broadcast/ANY address */
690 if (bacmp(&conn->dst, BDADDR_ANY))
691 return;
692
693 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
694 d->bis != conn->iso_qos.bcast.bis)
695 return;
696
697 d->count++;
698}
699
700static int terminate_big_sync(struct hci_dev *hdev, void *data)
701{
702 struct iso_list_data *d = data;
703
704 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
705
706 hci_disable_per_advertising_sync(hdev, d->bis);
707 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
708
709 /* Only terminate BIG if it has been created */
710 if (!d->big_term)
711 return 0;
712
713 return hci_le_terminate_big_sync(hdev, d->big,
714 HCI_ERROR_LOCAL_HOST_TERM);
715}
716
717static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
718{
719 kfree(data);
720}
721
722static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
723{
724 struct iso_list_data *d;
725 int ret;
726
727 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
728 conn->iso_qos.bcast.bis);
729
730 d = kzalloc(sizeof(*d), GFP_KERNEL);
731 if (!d)
732 return -ENOMEM;
733
734 d->big = conn->iso_qos.bcast.big;
735 d->bis = conn->iso_qos.bcast.bis;
736 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
737
738 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
739 terminate_big_destroy);
740 if (ret)
741 kfree(d);
742
743 return ret;
744}
745
746static int big_terminate_sync(struct hci_dev *hdev, void *data)
747{
748 struct iso_list_data *d = data;
749
750 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
751 d->sync_handle);
752
753 if (d->big_sync_term)
754 hci_le_big_terminate_sync(hdev, d->big);
755
756 if (d->pa_sync_term)
757 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
758
759 return 0;
760}
761
762static void find_bis(struct hci_conn *conn, void *data)
763{
764 struct iso_list_data *d = data;
765
766 /* Ignore if BIG doesn't match */
767 if (d->big != conn->iso_qos.bcast.big)
768 return;
769
770 d->count++;
771}
772
773static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
774{
775 struct iso_list_data *d;
776 int ret;
777
778 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
779
780 d = kzalloc(sizeof(*d), GFP_KERNEL);
781 if (!d)
782 return -ENOMEM;
783
784 d->big = big;
785 d->sync_handle = conn->sync_handle;
786
787 if (test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
788 hci_conn_hash_list_flag(hdev, find_bis, BIS_LINK,
789 HCI_CONN_PA_SYNC, d);
790
791 if (!d->count)
792 d->pa_sync_term = true;
793
794 d->count = 0;
795 }
796
797 if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) {
798 hci_conn_hash_list_flag(hdev, find_bis, BIS_LINK,
799 HCI_CONN_BIG_SYNC, d);
800
801 if (!d->count)
802 d->big_sync_term = true;
803 }
804
805 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
806 terminate_big_destroy);
807 if (ret)
808 kfree(d);
809
810 return ret;
811}
812
813/* Cleanup BIS connection
814 *
815 * Detects if there any BIS left connected in a BIG
816 * broadcaster: Remove advertising instance and terminate BIG.
817 * broadcaster receiver: Teminate BIG sync and terminate PA sync.
818 */
819static void bis_cleanup(struct hci_conn *conn)
820{
821 struct hci_dev *hdev = conn->hdev;
822 struct hci_conn *bis;
823
824 bt_dev_dbg(hdev, "conn %p", conn);
825
826 if (conn->role == HCI_ROLE_MASTER) {
827 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
828 return;
829
830 /* Check if ISO connection is a BIS and terminate advertising
831 * set and BIG if there are no other connections using it.
832 */
833 bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big);
834 if (bis)
835 return;
836
837 hci_le_terminate_big(hdev, conn);
838 } else {
839 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
840 conn);
841 }
842}
843
844static int remove_cig_sync(struct hci_dev *hdev, void *data)
845{
846 u8 handle = PTR_UINT(data);
847
848 return hci_le_remove_cig_sync(hdev, handle);
849}
850
851static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
852{
853 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
854
855 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
856 NULL);
857}
858
859static void find_cis(struct hci_conn *conn, void *data)
860{
861 struct iso_list_data *d = data;
862
863 /* Ignore broadcast or if CIG don't match */
864 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
865 return;
866
867 d->count++;
868}
869
870/* Cleanup CIS connection:
871 *
872 * Detects if there any CIS left connected in a CIG and remove it.
873 */
874static void cis_cleanup(struct hci_conn *conn)
875{
876 struct hci_dev *hdev = conn->hdev;
877 struct iso_list_data d;
878
879 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
880 return;
881
882 memset(&d, 0, sizeof(d));
883 d.cig = conn->iso_qos.ucast.cig;
884
885 /* Check if ISO connection is a CIS and remove CIG if there are
886 * no other connections using it.
887 */
888 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_BOUND, &d);
889 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECT,
890 &d);
891 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECTED,
892 &d);
893 if (d.count)
894 return;
895
896 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
897}
898
899static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
900{
901 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
902 U16_MAX, GFP_ATOMIC);
903}
904
905static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
906 u8 role, u16 handle)
907{
908 struct hci_conn *conn;
909
910 switch (type) {
911 case ACL_LINK:
912 if (!hdev->acl_mtu)
913 return ERR_PTR(-ECONNREFUSED);
914 break;
915 case CIS_LINK:
916 case BIS_LINK:
917 if (hdev->iso_mtu)
918 /* Dedicated ISO Buffer exists */
919 break;
920 fallthrough;
921 case LE_LINK:
922 if (hdev->le_mtu && hdev->le_mtu < HCI_MIN_LE_MTU)
923 return ERR_PTR(-ECONNREFUSED);
924 if (!hdev->le_mtu && hdev->acl_mtu < HCI_MIN_LE_MTU)
925 return ERR_PTR(-ECONNREFUSED);
926 break;
927 case SCO_LINK:
928 case ESCO_LINK:
929 if (!hdev->sco_pkts)
930 /* Controller does not support SCO or eSCO over HCI */
931 return ERR_PTR(-ECONNREFUSED);
932 break;
933 default:
934 return ERR_PTR(-ECONNREFUSED);
935 }
936
937 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
938
939 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
940 if (!conn)
941 return ERR_PTR(-ENOMEM);
942
943 bacpy(&conn->dst, dst);
944 bacpy(&conn->src, &hdev->bdaddr);
945 conn->handle = handle;
946 conn->hdev = hdev;
947 conn->type = type;
948 conn->role = role;
949 conn->mode = HCI_CM_ACTIVE;
950 conn->state = BT_OPEN;
951 conn->auth_type = HCI_AT_GENERAL_BONDING;
952 conn->io_capability = hdev->io_capability;
953 conn->remote_auth = 0xff;
954 conn->key_type = 0xff;
955 conn->rssi = HCI_RSSI_INVALID;
956 conn->tx_power = HCI_TX_POWER_INVALID;
957 conn->max_tx_power = HCI_TX_POWER_INVALID;
958 conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
959 conn->sid = HCI_SID_INVALID;
960
961 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
962 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
963
964 /* Set Default Authenticated payload timeout to 30s */
965 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
966
967 if (conn->role == HCI_ROLE_MASTER)
968 conn->out = true;
969
970 switch (type) {
971 case ACL_LINK:
972 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
973 conn->mtu = hdev->acl_mtu;
974 break;
975 case LE_LINK:
976 /* conn->src should reflect the local identity address */
977 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
978 conn->mtu = hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
979 break;
980 case CIS_LINK:
981 case BIS_LINK:
982 /* conn->src should reflect the local identity address */
983 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
984
985 /* set proper cleanup function */
986 if (!bacmp(dst, BDADDR_ANY))
987 conn->cleanup = bis_cleanup;
988 else if (conn->role == HCI_ROLE_MASTER)
989 conn->cleanup = cis_cleanup;
990
991 conn->mtu = hdev->iso_mtu ? hdev->iso_mtu :
992 hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
993 break;
994 case SCO_LINK:
995 if (lmp_esco_capable(hdev))
996 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
997 (hdev->esco_type & EDR_ESCO_MASK);
998 else
999 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1000
1001 conn->mtu = hdev->sco_mtu;
1002 break;
1003 case ESCO_LINK:
1004 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1005 conn->mtu = hdev->sco_mtu;
1006 break;
1007 }
1008
1009 skb_queue_head_init(&conn->data_q);
1010 skb_queue_head_init(&conn->tx_q.queue);
1011
1012 INIT_LIST_HEAD(&conn->chan_list);
1013 INIT_LIST_HEAD(&conn->link_list);
1014
1015 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1016 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1017 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1018 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1019
1020 atomic_set(&conn->refcnt, 0);
1021
1022 hci_dev_hold(hdev);
1023
1024 hci_conn_hash_add(hdev, conn);
1025
1026 /* The SCO and eSCO connections will only be notified when their
1027 * setup has been completed. This is different to ACL links which
1028 * can be notified right away.
1029 */
1030 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1031 if (hdev->notify)
1032 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1033 }
1034
1035 hci_conn_init_sysfs(conn);
1036
1037 return conn;
1038}
1039
1040struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1041 bdaddr_t *dst, u8 role)
1042{
1043 int handle;
1044
1045 bt_dev_dbg(hdev, "dst %pMR", dst);
1046
1047 handle = hci_conn_hash_alloc_unset(hdev);
1048 if (unlikely(handle < 0))
1049 return ERR_PTR(-ECONNREFUSED);
1050
1051 return __hci_conn_add(hdev, type, dst, role, handle);
1052}
1053
1054struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
1055 u8 role, u16 handle)
1056{
1057 if (handle > HCI_CONN_HANDLE_MAX)
1058 return ERR_PTR(-EINVAL);
1059
1060 return __hci_conn_add(hdev, type, dst, role, handle);
1061}
1062
1063static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1064{
1065 if (!reason)
1066 reason = HCI_ERROR_REMOTE_USER_TERM;
1067
1068 /* Due to race, SCO/ISO conn might be not established yet at this point,
1069 * and nothing else will clean it up. In other cases it is done via HCI
1070 * events.
1071 */
1072 switch (conn->type) {
1073 case SCO_LINK:
1074 case ESCO_LINK:
1075 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1076 hci_conn_failed(conn, reason);
1077 break;
1078 case CIS_LINK:
1079 case BIS_LINK:
1080 if ((conn->state != BT_CONNECTED &&
1081 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) ||
1082 test_bit(HCI_CONN_BIG_CREATED, &conn->flags))
1083 hci_conn_failed(conn, reason);
1084 break;
1085 }
1086}
1087
1088static void hci_conn_unlink(struct hci_conn *conn)
1089{
1090 struct hci_dev *hdev = conn->hdev;
1091
1092 bt_dev_dbg(hdev, "hcon %p", conn);
1093
1094 if (!conn->parent) {
1095 struct hci_link *link, *t;
1096
1097 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1098 struct hci_conn *child = link->conn;
1099
1100 hci_conn_unlink(child);
1101
1102 /* If hdev is down it means
1103 * hci_dev_close_sync/hci_conn_hash_flush is in progress
1104 * and links don't need to be cleanup as all connections
1105 * would be cleanup.
1106 */
1107 if (!test_bit(HCI_UP, &hdev->flags))
1108 continue;
1109
1110 hci_conn_cleanup_child(child, conn->abort_reason);
1111 }
1112
1113 return;
1114 }
1115
1116 if (!conn->link)
1117 return;
1118
1119 list_del_rcu(&conn->link->list);
1120 synchronize_rcu();
1121
1122 hci_conn_drop(conn->parent);
1123 hci_conn_put(conn->parent);
1124 conn->parent = NULL;
1125
1126 kfree(conn->link);
1127 conn->link = NULL;
1128}
1129
1130void hci_conn_del(struct hci_conn *conn)
1131{
1132 struct hci_dev *hdev = conn->hdev;
1133
1134 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1135
1136 hci_conn_unlink(conn);
1137
1138 disable_delayed_work_sync(&conn->disc_work);
1139 disable_delayed_work_sync(&conn->auto_accept_work);
1140 disable_delayed_work_sync(&conn->idle_work);
1141
1142 if (conn->type == ACL_LINK) {
1143 /* Unacked frames */
1144 hdev->acl_cnt += conn->sent;
1145 } else if (conn->type == LE_LINK) {
1146 cancel_delayed_work(&conn->le_conn_timeout);
1147
1148 if (hdev->le_pkts)
1149 hdev->le_cnt += conn->sent;
1150 else
1151 hdev->acl_cnt += conn->sent;
1152 } else {
1153 /* Unacked ISO frames */
1154 if (conn->type == CIS_LINK ||
1155 conn->type == BIS_LINK) {
1156 if (hdev->iso_pkts)
1157 hdev->iso_cnt += conn->sent;
1158 else if (hdev->le_pkts)
1159 hdev->le_cnt += conn->sent;
1160 else
1161 hdev->acl_cnt += conn->sent;
1162 }
1163 }
1164
1165 skb_queue_purge(&conn->data_q);
1166 skb_queue_purge(&conn->tx_q.queue);
1167
1168 /* Remove the connection from the list and cleanup its remaining
1169 * state. This is a separate function since for some cases like
1170 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1171 * rest of hci_conn_del.
1172 */
1173 hci_conn_cleanup(conn);
1174
1175 /* Dequeue callbacks using connection pointer as data */
1176 hci_cmd_sync_dequeue(hdev, NULL, conn, NULL);
1177}
1178
1179struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1180{
1181 int use_src = bacmp(src, BDADDR_ANY);
1182 struct hci_dev *hdev = NULL, *d;
1183
1184 BT_DBG("%pMR -> %pMR", src, dst);
1185
1186 read_lock(&hci_dev_list_lock);
1187
1188 list_for_each_entry(d, &hci_dev_list, list) {
1189 if (!test_bit(HCI_UP, &d->flags) ||
1190 hci_dev_test_flag(d, HCI_USER_CHANNEL))
1191 continue;
1192
1193 /* Simple routing:
1194 * No source address - find interface with bdaddr != dst
1195 * Source address - find interface with bdaddr == src
1196 */
1197
1198 if (use_src) {
1199 bdaddr_t id_addr;
1200 u8 id_addr_type;
1201
1202 if (src_type == BDADDR_BREDR) {
1203 if (!lmp_bredr_capable(d))
1204 continue;
1205 bacpy(&id_addr, &d->bdaddr);
1206 id_addr_type = BDADDR_BREDR;
1207 } else {
1208 if (!lmp_le_capable(d))
1209 continue;
1210
1211 hci_copy_identity_address(d, &id_addr,
1212 &id_addr_type);
1213
1214 /* Convert from HCI to three-value type */
1215 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1216 id_addr_type = BDADDR_LE_PUBLIC;
1217 else
1218 id_addr_type = BDADDR_LE_RANDOM;
1219 }
1220
1221 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1222 hdev = d; break;
1223 }
1224 } else {
1225 if (bacmp(&d->bdaddr, dst)) {
1226 hdev = d; break;
1227 }
1228 }
1229 }
1230
1231 if (hdev)
1232 hdev = hci_dev_hold(hdev);
1233
1234 read_unlock(&hci_dev_list_lock);
1235 return hdev;
1236}
1237EXPORT_SYMBOL(hci_get_route);
1238
1239/* This function requires the caller holds hdev->lock */
1240static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1241{
1242 struct hci_dev *hdev = conn->hdev;
1243
1244 hci_connect_le_scan_cleanup(conn, status);
1245
1246 /* Enable advertising in case this was a failed connection
1247 * attempt as a peripheral.
1248 */
1249 hci_enable_advertising(hdev);
1250}
1251
1252/* This function requires the caller holds hdev->lock */
1253void hci_conn_failed(struct hci_conn *conn, u8 status)
1254{
1255 struct hci_dev *hdev = conn->hdev;
1256
1257 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1258
1259 switch (conn->type) {
1260 case LE_LINK:
1261 hci_le_conn_failed(conn, status);
1262 break;
1263 case ACL_LINK:
1264 mgmt_connect_failed(hdev, conn, status);
1265 break;
1266 }
1267
1268 /* In case of BIG/PA sync failed, clear conn flags so that
1269 * the conns will be correctly cleaned up by ISO layer
1270 */
1271 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1272 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1273
1274 conn->state = BT_CLOSED;
1275 hci_connect_cfm(conn, status);
1276 hci_conn_del(conn);
1277}
1278
1279/* This function requires the caller holds hdev->lock */
1280u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1281{
1282 struct hci_dev *hdev = conn->hdev;
1283
1284 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1285
1286 if (conn->handle == handle)
1287 return 0;
1288
1289 if (handle > HCI_CONN_HANDLE_MAX) {
1290 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1291 handle, HCI_CONN_HANDLE_MAX);
1292 return HCI_ERROR_INVALID_PARAMETERS;
1293 }
1294
1295 /* If abort_reason has been sent it means the connection is being
1296 * aborted and the handle shall not be changed.
1297 */
1298 if (conn->abort_reason)
1299 return conn->abort_reason;
1300
1301 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1302 ida_free(&hdev->unset_handle_ida, conn->handle);
1303
1304 conn->handle = handle;
1305
1306 return 0;
1307}
1308
1309struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1310 u8 dst_type, bool dst_resolved, u8 sec_level,
1311 u16 conn_timeout, u8 role, u8 phy, u8 sec_phy)
1312{
1313 struct hci_conn *conn;
1314 struct smp_irk *irk;
1315 int err;
1316
1317 /* Let's make sure that le is enabled.*/
1318 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1319 if (lmp_le_capable(hdev))
1320 return ERR_PTR(-ECONNREFUSED);
1321
1322 return ERR_PTR(-EOPNOTSUPP);
1323 }
1324
1325 /* Since the controller supports only one LE connection attempt at a
1326 * time, we return -EBUSY if there is any connection attempt running.
1327 */
1328 if (hci_lookup_le_connect(hdev))
1329 return ERR_PTR(-EBUSY);
1330
1331 /* If there's already a connection object but it's not in
1332 * scanning state it means it must already be established, in
1333 * which case we can't do anything else except report a failure
1334 * to connect.
1335 */
1336 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1337 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1338 return ERR_PTR(-EBUSY);
1339 }
1340
1341 /* Check if the destination address has been resolved by the controller
1342 * since if it did then the identity address shall be used.
1343 */
1344 if (!dst_resolved) {
1345 /* When given an identity address with existing identity
1346 * resolving key, the connection needs to be established
1347 * to a resolvable random address.
1348 *
1349 * Storing the resolvable random address is required here
1350 * to handle connection failures. The address will later
1351 * be resolved back into the original identity address
1352 * from the connect request.
1353 */
1354 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1355 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1356 dst = &irk->rpa;
1357 dst_type = ADDR_LE_DEV_RANDOM;
1358 }
1359 }
1360
1361 if (conn) {
1362 bacpy(&conn->dst, dst);
1363 } else {
1364 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1365 if (IS_ERR(conn))
1366 return conn;
1367 hci_conn_hold(conn);
1368 conn->pending_sec_level = sec_level;
1369 }
1370
1371 conn->dst_type = dst_type;
1372 conn->sec_level = BT_SECURITY_LOW;
1373 conn->conn_timeout = conn_timeout;
1374 conn->le_adv_phy = phy;
1375 conn->le_adv_sec_phy = sec_phy;
1376
1377 err = hci_connect_le_sync(hdev, conn);
1378 if (err) {
1379 hci_conn_del(conn);
1380 return ERR_PTR(err);
1381 }
1382
1383 return conn;
1384}
1385
1386static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1387{
1388 struct hci_conn *conn;
1389
1390 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1391 if (!conn)
1392 return false;
1393
1394 if (conn->state != BT_CONNECTED)
1395 return false;
1396
1397 return true;
1398}
1399
1400/* This function requires the caller holds hdev->lock */
1401static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1402 bdaddr_t *addr, u8 addr_type)
1403{
1404 struct hci_conn_params *params;
1405
1406 if (is_connected(hdev, addr, addr_type))
1407 return -EISCONN;
1408
1409 params = hci_conn_params_lookup(hdev, addr, addr_type);
1410 if (!params) {
1411 params = hci_conn_params_add(hdev, addr, addr_type);
1412 if (!params)
1413 return -ENOMEM;
1414
1415 /* If we created new params, mark them to be deleted in
1416 * hci_connect_le_scan_cleanup. It's different case than
1417 * existing disabled params, those will stay after cleanup.
1418 */
1419 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1420 }
1421
1422 /* We're trying to connect, so make sure params are at pend_le_conns */
1423 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1424 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1425 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1426 hci_pend_le_list_del_init(params);
1427 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1428 }
1429
1430 params->explicit_connect = true;
1431
1432 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1433 params->auto_connect);
1434
1435 return 0;
1436}
1437
1438static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1439{
1440 struct hci_conn *conn;
1441 u8 big;
1442
1443 /* Allocate a BIG if not set */
1444 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1445 for (big = 0x00; big < 0xef; big++) {
1446
1447 conn = hci_conn_hash_lookup_big(hdev, big);
1448 if (!conn)
1449 break;
1450 }
1451
1452 if (big == 0xef)
1453 return -EADDRNOTAVAIL;
1454
1455 /* Update BIG */
1456 qos->bcast.big = big;
1457 }
1458
1459 return 0;
1460}
1461
1462static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1463{
1464 struct hci_conn *conn;
1465 u8 bis;
1466
1467 /* Allocate BIS if not set */
1468 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1469 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1470 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1471
1472 if (conn) {
1473 /* If the BIG handle is already matched to an advertising
1474 * handle, do not allocate a new one.
1475 */
1476 qos->bcast.bis = conn->iso_qos.bcast.bis;
1477 return 0;
1478 }
1479 }
1480
1481 /* Find an unused adv set to advertise BIS, skip instance 0x00
1482 * since it is reserved as general purpose set.
1483 */
1484 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1485 bis++) {
1486
1487 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1488 if (!conn)
1489 break;
1490 }
1491
1492 if (bis == hdev->le_num_of_adv_sets)
1493 return -EADDRNOTAVAIL;
1494
1495 /* Update BIS */
1496 qos->bcast.bis = bis;
1497 }
1498
1499 return 0;
1500}
1501
1502/* This function requires the caller holds hdev->lock */
1503static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1504 __u8 sid, struct bt_iso_qos *qos,
1505 __u8 base_len, __u8 *base)
1506{
1507 struct hci_conn *conn;
1508 int err;
1509
1510 /* Let's make sure that le is enabled.*/
1511 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1512 if (lmp_le_capable(hdev))
1513 return ERR_PTR(-ECONNREFUSED);
1514 return ERR_PTR(-EOPNOTSUPP);
1515 }
1516
1517 err = qos_set_big(hdev, qos);
1518 if (err)
1519 return ERR_PTR(err);
1520
1521 err = qos_set_bis(hdev, qos);
1522 if (err)
1523 return ERR_PTR(err);
1524
1525 /* Check if the LE Create BIG command has already been sent */
1526 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1527 qos->bcast.big);
1528 if (conn)
1529 return ERR_PTR(-EADDRINUSE);
1530
1531 /* Check BIS settings against other bound BISes, since all
1532 * BISes in a BIG must have the same value for all parameters
1533 */
1534 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1535
1536 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1537 base_len != conn->le_per_adv_data_len ||
1538 memcmp(conn->le_per_adv_data, base, base_len)))
1539 return ERR_PTR(-EADDRINUSE);
1540
1541 conn = hci_conn_add_unset(hdev, BIS_LINK, dst, HCI_ROLE_MASTER);
1542 if (IS_ERR(conn))
1543 return conn;
1544
1545 conn->state = BT_CONNECT;
1546 conn->sid = sid;
1547
1548 hci_conn_hold(conn);
1549 return conn;
1550}
1551
1552/* This function requires the caller holds hdev->lock */
1553struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1554 u8 dst_type, u8 sec_level,
1555 u16 conn_timeout,
1556 enum conn_reasons conn_reason)
1557{
1558 struct hci_conn *conn;
1559
1560 /* Let's make sure that le is enabled.*/
1561 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1562 if (lmp_le_capable(hdev))
1563 return ERR_PTR(-ECONNREFUSED);
1564
1565 return ERR_PTR(-EOPNOTSUPP);
1566 }
1567
1568 /* Some devices send ATT messages as soon as the physical link is
1569 * established. To be able to handle these ATT messages, the user-
1570 * space first establishes the connection and then starts the pairing
1571 * process.
1572 *
1573 * So if a hci_conn object already exists for the following connection
1574 * attempt, we simply update pending_sec_level and auth_type fields
1575 * and return the object found.
1576 */
1577 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1578 if (conn) {
1579 if (conn->pending_sec_level < sec_level)
1580 conn->pending_sec_level = sec_level;
1581 goto done;
1582 }
1583
1584 BT_DBG("requesting refresh of dst_addr");
1585
1586 conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1587 if (IS_ERR(conn))
1588 return conn;
1589
1590 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1591 hci_conn_del(conn);
1592 return ERR_PTR(-EBUSY);
1593 }
1594
1595 conn->state = BT_CONNECT;
1596 set_bit(HCI_CONN_SCANNING, &conn->flags);
1597 conn->dst_type = dst_type;
1598 conn->sec_level = BT_SECURITY_LOW;
1599 conn->pending_sec_level = sec_level;
1600 conn->conn_timeout = conn_timeout;
1601 conn->conn_reason = conn_reason;
1602
1603 hci_update_passive_scan(hdev);
1604
1605done:
1606 hci_conn_hold(conn);
1607 return conn;
1608}
1609
1610struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1611 u8 sec_level, u8 auth_type,
1612 enum conn_reasons conn_reason, u16 timeout)
1613{
1614 struct hci_conn *acl;
1615
1616 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1617 if (lmp_bredr_capable(hdev))
1618 return ERR_PTR(-ECONNREFUSED);
1619
1620 return ERR_PTR(-EOPNOTSUPP);
1621 }
1622
1623 /* Reject outgoing connection to device with same BD ADDR against
1624 * CVE-2020-26555
1625 */
1626 if (!bacmp(&hdev->bdaddr, dst)) {
1627 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1628 dst);
1629 return ERR_PTR(-ECONNREFUSED);
1630 }
1631
1632 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1633 if (!acl) {
1634 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1635 if (IS_ERR(acl))
1636 return acl;
1637 }
1638
1639 hci_conn_hold(acl);
1640
1641 acl->conn_reason = conn_reason;
1642 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1643 int err;
1644
1645 acl->sec_level = BT_SECURITY_LOW;
1646 acl->pending_sec_level = sec_level;
1647 acl->auth_type = auth_type;
1648 acl->conn_timeout = timeout;
1649
1650 err = hci_connect_acl_sync(hdev, acl);
1651 if (err) {
1652 hci_conn_del(acl);
1653 return ERR_PTR(err);
1654 }
1655 }
1656
1657 return acl;
1658}
1659
1660static struct hci_link *hci_conn_link(struct hci_conn *parent,
1661 struct hci_conn *conn)
1662{
1663 struct hci_dev *hdev = parent->hdev;
1664 struct hci_link *link;
1665
1666 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1667
1668 if (conn->link)
1669 return conn->link;
1670
1671 if (conn->parent)
1672 return NULL;
1673
1674 link = kzalloc(sizeof(*link), GFP_KERNEL);
1675 if (!link)
1676 return NULL;
1677
1678 link->conn = hci_conn_hold(conn);
1679 conn->link = link;
1680 conn->parent = hci_conn_get(parent);
1681
1682 /* Use list_add_tail_rcu append to the list */
1683 list_add_tail_rcu(&link->list, &parent->link_list);
1684
1685 return link;
1686}
1687
1688struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1689 __u16 setting, struct bt_codec *codec,
1690 u16 timeout)
1691{
1692 struct hci_conn *acl;
1693 struct hci_conn *sco;
1694 struct hci_link *link;
1695
1696 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1697 CONN_REASON_SCO_CONNECT, timeout);
1698 if (IS_ERR(acl))
1699 return acl;
1700
1701 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1702 if (!sco) {
1703 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1704 if (IS_ERR(sco)) {
1705 hci_conn_drop(acl);
1706 return sco;
1707 }
1708 }
1709
1710 link = hci_conn_link(acl, sco);
1711 if (!link) {
1712 hci_conn_drop(acl);
1713 hci_conn_drop(sco);
1714 return ERR_PTR(-ENOLINK);
1715 }
1716
1717 sco->setting = setting;
1718 sco->codec = *codec;
1719
1720 if (acl->state == BT_CONNECTED &&
1721 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1722 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1723 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1724
1725 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1726 /* defer SCO setup until mode change completed */
1727 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1728 return sco;
1729 }
1730
1731 hci_sco_setup(acl, 0x00);
1732 }
1733
1734 return sco;
1735}
1736
1737static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1738{
1739 struct hci_dev *hdev = conn->hdev;
1740 struct hci_cp_le_create_big cp;
1741 struct iso_list_data data;
1742
1743 memset(&cp, 0, sizeof(cp));
1744
1745 data.big = qos->bcast.big;
1746 data.bis = qos->bcast.bis;
1747 data.count = 0;
1748
1749 /* Create a BIS for each bound connection */
1750 hci_conn_hash_list_state(hdev, bis_list, BIS_LINK,
1751 BT_BOUND, &data);
1752
1753 cp.handle = qos->bcast.big;
1754 cp.adv_handle = qos->bcast.bis;
1755 cp.num_bis = data.count;
1756 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1757 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1758 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1759 cp.bis.rtn = qos->bcast.out.rtn;
1760 cp.bis.phy = qos->bcast.out.phy;
1761 cp.bis.packing = qos->bcast.packing;
1762 cp.bis.framing = qos->bcast.framing;
1763 cp.bis.encryption = qos->bcast.encryption;
1764 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1765
1766 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1767}
1768
1769static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1770{
1771 DEFINE_FLEX(struct hci_cp_le_set_cig_params, pdu, cis, num_cis, 0x1f);
1772 u8 cig_id = PTR_UINT(data);
1773 struct hci_conn *conn;
1774 struct bt_iso_qos *qos;
1775 u8 aux_num_cis = 0;
1776 u8 cis_id;
1777
1778 conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1779 if (!conn)
1780 return 0;
1781
1782 qos = &conn->iso_qos;
1783 pdu->cig_id = cig_id;
1784 hci_cpu_to_le24(qos->ucast.out.interval, pdu->c_interval);
1785 hci_cpu_to_le24(qos->ucast.in.interval, pdu->p_interval);
1786 pdu->sca = qos->ucast.sca;
1787 pdu->packing = qos->ucast.packing;
1788 pdu->framing = qos->ucast.framing;
1789 pdu->c_latency = cpu_to_le16(qos->ucast.out.latency);
1790 pdu->p_latency = cpu_to_le16(qos->ucast.in.latency);
1791
1792 /* Reprogram all CIS(s) with the same CIG, valid range are:
1793 * num_cis: 0x00 to 0x1F
1794 * cis_id: 0x00 to 0xEF
1795 */
1796 for (cis_id = 0x00; cis_id < 0xf0 &&
1797 aux_num_cis < pdu->num_cis; cis_id++) {
1798 struct hci_cis_params *cis;
1799
1800 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1801 if (!conn)
1802 continue;
1803
1804 qos = &conn->iso_qos;
1805
1806 cis = &pdu->cis[aux_num_cis++];
1807 cis->cis_id = cis_id;
1808 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1809 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1810 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
1811 qos->ucast.in.phy;
1812 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
1813 qos->ucast.out.phy;
1814 cis->c_rtn = qos->ucast.out.rtn;
1815 cis->p_rtn = qos->ucast.in.rtn;
1816 }
1817 pdu->num_cis = aux_num_cis;
1818
1819 if (!pdu->num_cis)
1820 return 0;
1821
1822 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1823 struct_size(pdu, cis, pdu->num_cis),
1824 pdu, HCI_CMD_TIMEOUT);
1825}
1826
1827static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1828{
1829 struct hci_dev *hdev = conn->hdev;
1830 struct iso_list_data data;
1831
1832 memset(&data, 0, sizeof(data));
1833
1834 /* Allocate first still reconfigurable CIG if not set */
1835 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1836 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1837 data.count = 0;
1838
1839 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK,
1840 BT_CONNECT, &data);
1841 if (data.count)
1842 continue;
1843
1844 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK,
1845 BT_CONNECTED, &data);
1846 if (!data.count)
1847 break;
1848 }
1849
1850 if (data.cig == 0xf0)
1851 return false;
1852
1853 /* Update CIG */
1854 qos->ucast.cig = data.cig;
1855 }
1856
1857 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1858 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1859 qos->ucast.cis))
1860 return false;
1861 goto done;
1862 }
1863
1864 /* Allocate first available CIS if not set */
1865 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1866 data.cis++) {
1867 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1868 data.cis)) {
1869 /* Update CIS */
1870 qos->ucast.cis = data.cis;
1871 break;
1872 }
1873 }
1874
1875 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1876 return false;
1877
1878done:
1879 if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1880 UINT_PTR(qos->ucast.cig), NULL) < 0)
1881 return false;
1882
1883 return true;
1884}
1885
1886struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1887 __u8 dst_type, struct bt_iso_qos *qos)
1888{
1889 struct hci_conn *cis;
1890
1891 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1892 qos->ucast.cis);
1893 if (!cis) {
1894 cis = hci_conn_add_unset(hdev, CIS_LINK, dst,
1895 HCI_ROLE_MASTER);
1896 if (IS_ERR(cis))
1897 return cis;
1898 cis->cleanup = cis_cleanup;
1899 cis->dst_type = dst_type;
1900 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1901 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1902 }
1903
1904 if (cis->state == BT_CONNECTED)
1905 return cis;
1906
1907 /* Check if CIS has been set and the settings matches */
1908 if (cis->state == BT_BOUND &&
1909 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1910 return cis;
1911
1912 /* Update LINK PHYs according to QoS preference */
1913 cis->le_tx_phy = qos->ucast.out.phy;
1914 cis->le_rx_phy = qos->ucast.in.phy;
1915
1916 /* If output interval is not set use the input interval as it cannot be
1917 * 0x000000.
1918 */
1919 if (!qos->ucast.out.interval)
1920 qos->ucast.out.interval = qos->ucast.in.interval;
1921
1922 /* If input interval is not set use the output interval as it cannot be
1923 * 0x000000.
1924 */
1925 if (!qos->ucast.in.interval)
1926 qos->ucast.in.interval = qos->ucast.out.interval;
1927
1928 /* If output latency is not set use the input latency as it cannot be
1929 * 0x0000.
1930 */
1931 if (!qos->ucast.out.latency)
1932 qos->ucast.out.latency = qos->ucast.in.latency;
1933
1934 /* If input latency is not set use the output latency as it cannot be
1935 * 0x0000.
1936 */
1937 if (!qos->ucast.in.latency)
1938 qos->ucast.in.latency = qos->ucast.out.latency;
1939
1940 if (!hci_le_set_cig_params(cis, qos)) {
1941 hci_conn_drop(cis);
1942 return ERR_PTR(-EINVAL);
1943 }
1944
1945 hci_conn_hold(cis);
1946
1947 cis->iso_qos = *qos;
1948 cis->state = BT_BOUND;
1949
1950 return cis;
1951}
1952
1953bool hci_iso_setup_path(struct hci_conn *conn)
1954{
1955 struct hci_dev *hdev = conn->hdev;
1956 struct hci_cp_le_setup_iso_path cmd;
1957
1958 memset(&cmd, 0, sizeof(cmd));
1959
1960 if (conn->iso_qos.ucast.out.sdu) {
1961 cmd.handle = cpu_to_le16(conn->handle);
1962 cmd.direction = 0x00; /* Input (Host to Controller) */
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 if (conn->iso_qos.ucast.in.sdu) {
1972 cmd.handle = cpu_to_le16(conn->handle);
1973 cmd.direction = 0x01; /* Output (Controller to Host) */
1974 cmd.path = 0x00; /* HCI path if enabled */
1975 cmd.codec = 0x03; /* Transparent Data */
1976
1977 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1978 &cmd) < 0)
1979 return false;
1980 }
1981
1982 return true;
1983}
1984
1985int hci_conn_check_create_cis(struct hci_conn *conn)
1986{
1987 if (conn->type != CIS_LINK)
1988 return -EINVAL;
1989
1990 if (!conn->parent || conn->parent->state != BT_CONNECTED ||
1991 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
1992 return 1;
1993
1994 return 0;
1995}
1996
1997static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
1998{
1999 return hci_le_create_cis_sync(hdev);
2000}
2001
2002int hci_le_create_cis_pending(struct hci_dev *hdev)
2003{
2004 struct hci_conn *conn;
2005 bool pending = false;
2006
2007 rcu_read_lock();
2008
2009 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2010 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2011 rcu_read_unlock();
2012 return -EBUSY;
2013 }
2014
2015 if (!hci_conn_check_create_cis(conn))
2016 pending = true;
2017 }
2018
2019 rcu_read_unlock();
2020
2021 if (!pending)
2022 return 0;
2023
2024 /* Queue Create CIS */
2025 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2026}
2027
2028static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2029 struct bt_iso_io_qos *qos, __u8 phy)
2030{
2031 /* Only set MTU if PHY is enabled */
2032 if (!qos->sdu && qos->phy)
2033 qos->sdu = conn->mtu;
2034
2035 /* Use the same PHY as ACL if set to any */
2036 if (qos->phy == BT_ISO_PHY_ANY)
2037 qos->phy = phy;
2038
2039 /* Use LE ACL connection interval if not set */
2040 if (!qos->interval)
2041 /* ACL interval unit in 1.25 ms to us */
2042 qos->interval = conn->le_conn_interval * 1250;
2043
2044 /* Use LE ACL connection latency if not set */
2045 if (!qos->latency)
2046 qos->latency = conn->le_conn_latency;
2047}
2048
2049static int create_big_sync(struct hci_dev *hdev, void *data)
2050{
2051 struct hci_conn *conn = data;
2052 struct bt_iso_qos *qos = &conn->iso_qos;
2053 u16 interval, sync_interval = 0;
2054 u32 flags = 0;
2055 int err;
2056
2057 if (qos->bcast.out.phy == 0x02)
2058 flags |= MGMT_ADV_FLAG_SEC_2M;
2059
2060 /* Align intervals */
2061 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2062
2063 if (qos->bcast.bis)
2064 sync_interval = interval * 4;
2065
2066 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->sid,
2067 conn->le_per_adv_data_len,
2068 conn->le_per_adv_data, flags, interval,
2069 interval, sync_interval);
2070 if (err)
2071 return err;
2072
2073 return hci_le_create_big(conn, &conn->iso_qos);
2074}
2075
2076struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst,
2077 __u8 dst_type, __u8 sid,
2078 struct bt_iso_qos *qos)
2079{
2080 struct hci_conn *conn;
2081
2082 bt_dev_dbg(hdev, "dst %pMR type %d sid %d", dst, dst_type, sid);
2083
2084 conn = hci_conn_add_unset(hdev, BIS_LINK, dst, HCI_ROLE_SLAVE);
2085 if (IS_ERR(conn))
2086 return conn;
2087
2088 conn->iso_qos = *qos;
2089 conn->dst_type = dst_type;
2090 conn->sid = sid;
2091 conn->state = BT_LISTEN;
2092 conn->conn_timeout = msecs_to_jiffies(qos->bcast.sync_timeout * 10);
2093
2094 hci_conn_hold(conn);
2095
2096 hci_connect_pa_sync(hdev, conn);
2097
2098 return conn;
2099}
2100
2101int hci_conn_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2102 struct bt_iso_qos *qos, __u16 sync_handle,
2103 __u8 num_bis, __u8 bis[])
2104{
2105 int err;
2106
2107 if (num_bis < 0x01 || num_bis > ISO_MAX_NUM_BIS)
2108 return -EINVAL;
2109
2110 err = qos_set_big(hdev, qos);
2111 if (err)
2112 return err;
2113
2114 if (hcon) {
2115 /* Update hcon QoS */
2116 hcon->iso_qos = *qos;
2117
2118 hcon->num_bis = num_bis;
2119 memcpy(hcon->bis, bis, num_bis);
2120 hcon->conn_timeout = msecs_to_jiffies(qos->bcast.timeout * 10);
2121 }
2122
2123 return hci_connect_big_sync(hdev, hcon);
2124}
2125
2126static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2127{
2128 struct hci_conn *conn = data;
2129
2130 bt_dev_dbg(hdev, "conn %p", conn);
2131
2132 if (err) {
2133 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2134 hci_connect_cfm(conn, err);
2135 hci_conn_del(conn);
2136 }
2137}
2138
2139struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst, __u8 sid,
2140 struct bt_iso_qos *qos,
2141 __u8 base_len, __u8 *base)
2142{
2143 struct hci_conn *conn;
2144 struct hci_conn *parent;
2145 __u8 eir[HCI_MAX_PER_AD_LENGTH];
2146 struct hci_link *link;
2147
2148 /* Look for any BIS that is open for rebinding */
2149 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN);
2150 if (conn) {
2151 memcpy(qos, &conn->iso_qos, sizeof(*qos));
2152 conn->state = BT_CONNECTED;
2153 return conn;
2154 }
2155
2156 if (base_len && base)
2157 base_len = eir_append_service_data(eir, 0, 0x1851,
2158 base, base_len);
2159
2160 /* We need hci_conn object using the BDADDR_ANY as dst */
2161 conn = hci_add_bis(hdev, dst, sid, qos, base_len, eir);
2162 if (IS_ERR(conn))
2163 return conn;
2164
2165 /* Update LINK PHYs according to QoS preference */
2166 conn->le_tx_phy = qos->bcast.out.phy;
2167 conn->le_tx_phy = qos->bcast.out.phy;
2168
2169 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2170 if (base_len && base) {
2171 memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2172 conn->le_per_adv_data_len = base_len;
2173 }
2174
2175 hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2176 conn->le_tx_phy ? conn->le_tx_phy :
2177 hdev->le_tx_def_phys);
2178
2179 conn->iso_qos = *qos;
2180 conn->state = BT_BOUND;
2181
2182 /* Link BISes together */
2183 parent = hci_conn_hash_lookup_big(hdev,
2184 conn->iso_qos.bcast.big);
2185 if (parent && parent != conn) {
2186 link = hci_conn_link(parent, conn);
2187 hci_conn_drop(conn);
2188 if (!link)
2189 return ERR_PTR(-ENOLINK);
2190 }
2191
2192 return conn;
2193}
2194
2195static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2196{
2197 struct iso_list_data *d = data;
2198
2199 /* Skip if not broadcast/ANY address */
2200 if (bacmp(&conn->dst, BDADDR_ANY))
2201 return;
2202
2203 if (d->big != conn->iso_qos.bcast.big ||
2204 d->bis == BT_ISO_QOS_BIS_UNSET ||
2205 d->bis != conn->iso_qos.bcast.bis)
2206 return;
2207
2208 set_bit(HCI_CONN_PER_ADV, &conn->flags);
2209}
2210
2211struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2212 __u8 dst_type, __u8 sid,
2213 struct bt_iso_qos *qos,
2214 __u8 base_len, __u8 *base)
2215{
2216 struct hci_conn *conn;
2217 int err;
2218 struct iso_list_data data;
2219
2220 conn = hci_bind_bis(hdev, dst, sid, qos, base_len, base);
2221 if (IS_ERR(conn))
2222 return conn;
2223
2224 if (conn->state == BT_CONNECTED)
2225 return conn;
2226
2227 /* Check if SID needs to be allocated then search for the first
2228 * available.
2229 */
2230 if (conn->sid == HCI_SID_INVALID) {
2231 u8 sid;
2232
2233 for (sid = 0; sid <= 0x0f; sid++) {
2234 if (!hci_find_adv_sid(hdev, sid)) {
2235 conn->sid = sid;
2236 break;
2237 }
2238 }
2239 }
2240
2241 data.big = qos->bcast.big;
2242 data.bis = qos->bcast.bis;
2243
2244 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2245 * the start periodic advertising and create BIG commands have
2246 * been queued
2247 */
2248 hci_conn_hash_list_state(hdev, bis_mark_per_adv, BIS_LINK,
2249 BT_BOUND, &data);
2250
2251 /* Queue start periodic advertising and create BIG */
2252 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2253 create_big_complete);
2254 if (err < 0) {
2255 hci_conn_drop(conn);
2256 return ERR_PTR(err);
2257 }
2258
2259 return conn;
2260}
2261
2262struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2263 __u8 dst_type, struct bt_iso_qos *qos)
2264{
2265 struct hci_conn *le;
2266 struct hci_conn *cis;
2267 struct hci_link *link;
2268
2269 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2270 le = hci_connect_le(hdev, dst, dst_type, false,
2271 BT_SECURITY_LOW,
2272 HCI_LE_CONN_TIMEOUT,
2273 HCI_ROLE_SLAVE, 0, 0);
2274 else
2275 le = hci_connect_le_scan(hdev, dst, dst_type,
2276 BT_SECURITY_LOW,
2277 HCI_LE_CONN_TIMEOUT,
2278 CONN_REASON_ISO_CONNECT);
2279 if (IS_ERR(le))
2280 return le;
2281
2282 hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2283 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2284 hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2285 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2286
2287 cis = hci_bind_cis(hdev, dst, dst_type, qos);
2288 if (IS_ERR(cis)) {
2289 hci_conn_drop(le);
2290 return cis;
2291 }
2292
2293 link = hci_conn_link(le, cis);
2294 hci_conn_drop(cis);
2295 if (!link) {
2296 hci_conn_drop(le);
2297 return ERR_PTR(-ENOLINK);
2298 }
2299
2300 cis->state = BT_CONNECT;
2301
2302 hci_le_create_cis_pending(hdev);
2303
2304 return cis;
2305}
2306
2307/* Check link security requirement */
2308int hci_conn_check_link_mode(struct hci_conn *conn)
2309{
2310 BT_DBG("hcon %p", conn);
2311
2312 /* In Secure Connections Only mode, it is required that Secure
2313 * Connections is used and the link is encrypted with AES-CCM
2314 * using a P-256 authenticated combination key.
2315 */
2316 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2317 if (!hci_conn_sc_enabled(conn) ||
2318 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2319 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2320 return 0;
2321 }
2322
2323 /* AES encryption is required for Level 4:
2324 *
2325 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2326 * page 1319:
2327 *
2328 * 128-bit equivalent strength for link and encryption keys
2329 * required using FIPS approved algorithms (E0 not allowed,
2330 * SAFER+ not allowed, and P-192 not allowed; encryption key
2331 * not shortened)
2332 */
2333 if (conn->sec_level == BT_SECURITY_FIPS &&
2334 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2335 bt_dev_err(conn->hdev,
2336 "Invalid security: Missing AES-CCM usage");
2337 return 0;
2338 }
2339
2340 if (hci_conn_ssp_enabled(conn) &&
2341 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2342 return 0;
2343
2344 return 1;
2345}
2346
2347/* Authenticate remote device */
2348static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2349{
2350 BT_DBG("hcon %p", conn);
2351
2352 if (conn->pending_sec_level > sec_level)
2353 sec_level = conn->pending_sec_level;
2354
2355 if (sec_level > conn->sec_level)
2356 conn->pending_sec_level = sec_level;
2357 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2358 return 1;
2359
2360 /* Make sure we preserve an existing MITM requirement*/
2361 auth_type |= (conn->auth_type & 0x01);
2362
2363 conn->auth_type = auth_type;
2364
2365 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2366 struct hci_cp_auth_requested cp;
2367
2368 cp.handle = cpu_to_le16(conn->handle);
2369 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2370 sizeof(cp), &cp);
2371
2372 /* Set the ENCRYPT_PEND to trigger encryption after
2373 * authentication.
2374 */
2375 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2376 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2377 }
2378
2379 return 0;
2380}
2381
2382/* Encrypt the link */
2383static void hci_conn_encrypt(struct hci_conn *conn)
2384{
2385 BT_DBG("hcon %p", conn);
2386
2387 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2388 struct hci_cp_set_conn_encrypt cp;
2389 cp.handle = cpu_to_le16(conn->handle);
2390 cp.encrypt = 0x01;
2391 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2392 &cp);
2393 }
2394}
2395
2396/* Enable security */
2397int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2398 bool initiator)
2399{
2400 BT_DBG("hcon %p", conn);
2401
2402 if (conn->type == LE_LINK)
2403 return smp_conn_security(conn, sec_level);
2404
2405 /* For sdp we don't need the link key. */
2406 if (sec_level == BT_SECURITY_SDP)
2407 return 1;
2408
2409 /* For non 2.1 devices and low security level we don't need the link
2410 key. */
2411 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2412 return 1;
2413
2414 /* For other security levels we need the link key. */
2415 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2416 goto auth;
2417
2418 switch (conn->key_type) {
2419 case HCI_LK_AUTH_COMBINATION_P256:
2420 /* An authenticated FIPS approved combination key has
2421 * sufficient security for security level 4 or lower.
2422 */
2423 if (sec_level <= BT_SECURITY_FIPS)
2424 goto encrypt;
2425 break;
2426 case HCI_LK_AUTH_COMBINATION_P192:
2427 /* An authenticated combination key has sufficient security for
2428 * security level 3 or lower.
2429 */
2430 if (sec_level <= BT_SECURITY_HIGH)
2431 goto encrypt;
2432 break;
2433 case HCI_LK_UNAUTH_COMBINATION_P192:
2434 case HCI_LK_UNAUTH_COMBINATION_P256:
2435 /* An unauthenticated combination key has sufficient security
2436 * for security level 2 or lower.
2437 */
2438 if (sec_level <= BT_SECURITY_MEDIUM)
2439 goto encrypt;
2440 break;
2441 case HCI_LK_COMBINATION:
2442 /* A combination key has always sufficient security for the
2443 * security levels 2 or lower. High security level requires the
2444 * combination key is generated using maximum PIN code length
2445 * (16). For pre 2.1 units.
2446 */
2447 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2448 goto encrypt;
2449 break;
2450 default:
2451 break;
2452 }
2453
2454auth:
2455 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2456 return 0;
2457
2458 if (initiator)
2459 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2460
2461 if (!hci_conn_auth(conn, sec_level, auth_type))
2462 return 0;
2463
2464encrypt:
2465 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2466 /* Ensure that the encryption key size has been read,
2467 * otherwise stall the upper layer responses.
2468 */
2469 if (!conn->enc_key_size)
2470 return 0;
2471
2472 /* Nothing else needed, all requirements are met */
2473 return 1;
2474 }
2475
2476 hci_conn_encrypt(conn);
2477 return 0;
2478}
2479EXPORT_SYMBOL(hci_conn_security);
2480
2481/* Check secure link requirement */
2482int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2483{
2484 BT_DBG("hcon %p", conn);
2485
2486 /* Accept if non-secure or higher security level is required */
2487 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2488 return 1;
2489
2490 /* Accept if secure or higher security level is already present */
2491 if (conn->sec_level == BT_SECURITY_HIGH ||
2492 conn->sec_level == BT_SECURITY_FIPS)
2493 return 1;
2494
2495 /* Reject not secure link */
2496 return 0;
2497}
2498EXPORT_SYMBOL(hci_conn_check_secure);
2499
2500/* Switch role */
2501int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2502{
2503 BT_DBG("hcon %p", conn);
2504
2505 if (role == conn->role)
2506 return 1;
2507
2508 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2509 struct hci_cp_switch_role cp;
2510 bacpy(&cp.bdaddr, &conn->dst);
2511 cp.role = role;
2512 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2513 }
2514
2515 return 0;
2516}
2517EXPORT_SYMBOL(hci_conn_switch_role);
2518
2519/* Enter active mode */
2520void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2521{
2522 struct hci_dev *hdev = conn->hdev;
2523
2524 BT_DBG("hcon %p mode %d", conn, conn->mode);
2525
2526 if (conn->mode != HCI_CM_SNIFF)
2527 goto timer;
2528
2529 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2530 goto timer;
2531
2532 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2533 struct hci_cp_exit_sniff_mode cp;
2534 cp.handle = cpu_to_le16(conn->handle);
2535 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2536 }
2537
2538timer:
2539 if (hdev->idle_timeout > 0)
2540 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2541 msecs_to_jiffies(hdev->idle_timeout));
2542}
2543
2544/* Drop all connection on the device */
2545void hci_conn_hash_flush(struct hci_dev *hdev)
2546{
2547 struct list_head *head = &hdev->conn_hash.list;
2548 struct hci_conn *conn;
2549
2550 BT_DBG("hdev %s", hdev->name);
2551
2552 /* We should not traverse the list here, because hci_conn_del
2553 * can remove extra links, which may cause the list traversal
2554 * to hit items that have already been released.
2555 */
2556 while ((conn = list_first_entry_or_null(head,
2557 struct hci_conn,
2558 list)) != NULL) {
2559 conn->state = BT_CLOSED;
2560 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2561 hci_conn_del(conn);
2562 }
2563}
2564
2565static u32 get_link_mode(struct hci_conn *conn)
2566{
2567 u32 link_mode = 0;
2568
2569 if (conn->role == HCI_ROLE_MASTER)
2570 link_mode |= HCI_LM_MASTER;
2571
2572 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2573 link_mode |= HCI_LM_ENCRYPT;
2574
2575 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2576 link_mode |= HCI_LM_AUTH;
2577
2578 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2579 link_mode |= HCI_LM_SECURE;
2580
2581 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2582 link_mode |= HCI_LM_FIPS;
2583
2584 return link_mode;
2585}
2586
2587int hci_get_conn_list(void __user *arg)
2588{
2589 struct hci_conn *c;
2590 struct hci_conn_list_req req, *cl;
2591 struct hci_conn_info *ci;
2592 struct hci_dev *hdev;
2593 int n = 0, size, err;
2594
2595 if (copy_from_user(&req, arg, sizeof(req)))
2596 return -EFAULT;
2597
2598 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2599 return -EINVAL;
2600
2601 size = sizeof(req) + req.conn_num * sizeof(*ci);
2602
2603 cl = kmalloc(size, GFP_KERNEL);
2604 if (!cl)
2605 return -ENOMEM;
2606
2607 hdev = hci_dev_get(req.dev_id);
2608 if (!hdev) {
2609 kfree(cl);
2610 return -ENODEV;
2611 }
2612
2613 ci = cl->conn_info;
2614
2615 hci_dev_lock(hdev);
2616 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2617 bacpy(&(ci + n)->bdaddr, &c->dst);
2618 (ci + n)->handle = c->handle;
2619 (ci + n)->type = c->type;
2620 (ci + n)->out = c->out;
2621 (ci + n)->state = c->state;
2622 (ci + n)->link_mode = get_link_mode(c);
2623 if (++n >= req.conn_num)
2624 break;
2625 }
2626 hci_dev_unlock(hdev);
2627
2628 cl->dev_id = hdev->id;
2629 cl->conn_num = n;
2630 size = sizeof(req) + n * sizeof(*ci);
2631
2632 hci_dev_put(hdev);
2633
2634 err = copy_to_user(arg, cl, size);
2635 kfree(cl);
2636
2637 return err ? -EFAULT : 0;
2638}
2639
2640int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2641{
2642 struct hci_conn_info_req req;
2643 struct hci_conn_info ci;
2644 struct hci_conn *conn;
2645 char __user *ptr = arg + sizeof(req);
2646
2647 if (copy_from_user(&req, arg, sizeof(req)))
2648 return -EFAULT;
2649
2650 hci_dev_lock(hdev);
2651 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2652 if (conn) {
2653 bacpy(&ci.bdaddr, &conn->dst);
2654 ci.handle = conn->handle;
2655 ci.type = conn->type;
2656 ci.out = conn->out;
2657 ci.state = conn->state;
2658 ci.link_mode = get_link_mode(conn);
2659 }
2660 hci_dev_unlock(hdev);
2661
2662 if (!conn)
2663 return -ENOENT;
2664
2665 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2666}
2667
2668int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2669{
2670 struct hci_auth_info_req req;
2671 struct hci_conn *conn;
2672
2673 if (copy_from_user(&req, arg, sizeof(req)))
2674 return -EFAULT;
2675
2676 hci_dev_lock(hdev);
2677 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2678 if (conn)
2679 req.type = conn->auth_type;
2680 hci_dev_unlock(hdev);
2681
2682 if (!conn)
2683 return -ENOENT;
2684
2685 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2686}
2687
2688struct hci_chan *hci_chan_create(struct hci_conn *conn)
2689{
2690 struct hci_dev *hdev = conn->hdev;
2691 struct hci_chan *chan;
2692
2693 BT_DBG("%s hcon %p", hdev->name, conn);
2694
2695 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2696 BT_DBG("Refusing to create new hci_chan");
2697 return NULL;
2698 }
2699
2700 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2701 if (!chan)
2702 return NULL;
2703
2704 chan->conn = hci_conn_get(conn);
2705 skb_queue_head_init(&chan->data_q);
2706 chan->state = BT_CONNECTED;
2707
2708 list_add_rcu(&chan->list, &conn->chan_list);
2709
2710 return chan;
2711}
2712
2713void hci_chan_del(struct hci_chan *chan)
2714{
2715 struct hci_conn *conn = chan->conn;
2716 struct hci_dev *hdev = conn->hdev;
2717
2718 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2719
2720 list_del_rcu(&chan->list);
2721
2722 synchronize_rcu();
2723
2724 /* Prevent new hci_chan's to be created for this hci_conn */
2725 set_bit(HCI_CONN_DROP, &conn->flags);
2726
2727 hci_conn_put(conn);
2728
2729 skb_queue_purge(&chan->data_q);
2730 kfree(chan);
2731}
2732
2733void hci_chan_list_flush(struct hci_conn *conn)
2734{
2735 struct hci_chan *chan, *n;
2736
2737 BT_DBG("hcon %p", conn);
2738
2739 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2740 hci_chan_del(chan);
2741}
2742
2743static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2744 __u16 handle)
2745{
2746 struct hci_chan *hchan;
2747
2748 list_for_each_entry(hchan, &hcon->chan_list, list) {
2749 if (hchan->handle == handle)
2750 return hchan;
2751 }
2752
2753 return NULL;
2754}
2755
2756struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2757{
2758 struct hci_conn_hash *h = &hdev->conn_hash;
2759 struct hci_conn *hcon;
2760 struct hci_chan *hchan = NULL;
2761
2762 rcu_read_lock();
2763
2764 list_for_each_entry_rcu(hcon, &h->list, list) {
2765 hchan = __hci_chan_lookup_handle(hcon, handle);
2766 if (hchan)
2767 break;
2768 }
2769
2770 rcu_read_unlock();
2771
2772 return hchan;
2773}
2774
2775u32 hci_conn_get_phy(struct hci_conn *conn)
2776{
2777 u32 phys = 0;
2778
2779 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2780 * Table 6.2: Packets defined for synchronous, asynchronous, and
2781 * CPB logical transport types.
2782 */
2783 switch (conn->type) {
2784 case SCO_LINK:
2785 /* SCO logical transport (1 Mb/s):
2786 * HV1, HV2, HV3 and DV.
2787 */
2788 phys |= BT_PHY_BR_1M_1SLOT;
2789
2790 break;
2791
2792 case ACL_LINK:
2793 /* ACL logical transport (1 Mb/s) ptt=0:
2794 * DH1, DM3, DH3, DM5 and DH5.
2795 */
2796 phys |= BT_PHY_BR_1M_1SLOT;
2797
2798 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2799 phys |= BT_PHY_BR_1M_3SLOT;
2800
2801 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2802 phys |= BT_PHY_BR_1M_5SLOT;
2803
2804 /* ACL logical transport (2 Mb/s) ptt=1:
2805 * 2-DH1, 2-DH3 and 2-DH5.
2806 */
2807 if (!(conn->pkt_type & HCI_2DH1))
2808 phys |= BT_PHY_EDR_2M_1SLOT;
2809
2810 if (!(conn->pkt_type & HCI_2DH3))
2811 phys |= BT_PHY_EDR_2M_3SLOT;
2812
2813 if (!(conn->pkt_type & HCI_2DH5))
2814 phys |= BT_PHY_EDR_2M_5SLOT;
2815
2816 /* ACL logical transport (3 Mb/s) ptt=1:
2817 * 3-DH1, 3-DH3 and 3-DH5.
2818 */
2819 if (!(conn->pkt_type & HCI_3DH1))
2820 phys |= BT_PHY_EDR_3M_1SLOT;
2821
2822 if (!(conn->pkt_type & HCI_3DH3))
2823 phys |= BT_PHY_EDR_3M_3SLOT;
2824
2825 if (!(conn->pkt_type & HCI_3DH5))
2826 phys |= BT_PHY_EDR_3M_5SLOT;
2827
2828 break;
2829
2830 case ESCO_LINK:
2831 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2832 phys |= BT_PHY_BR_1M_1SLOT;
2833
2834 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2835 phys |= BT_PHY_BR_1M_3SLOT;
2836
2837 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2838 if (!(conn->pkt_type & ESCO_2EV3))
2839 phys |= BT_PHY_EDR_2M_1SLOT;
2840
2841 if (!(conn->pkt_type & ESCO_2EV5))
2842 phys |= BT_PHY_EDR_2M_3SLOT;
2843
2844 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2845 if (!(conn->pkt_type & ESCO_3EV3))
2846 phys |= BT_PHY_EDR_3M_1SLOT;
2847
2848 if (!(conn->pkt_type & ESCO_3EV5))
2849 phys |= BT_PHY_EDR_3M_3SLOT;
2850
2851 break;
2852
2853 case LE_LINK:
2854 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2855 phys |= BT_PHY_LE_1M_TX;
2856
2857 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2858 phys |= BT_PHY_LE_1M_RX;
2859
2860 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2861 phys |= BT_PHY_LE_2M_TX;
2862
2863 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2864 phys |= BT_PHY_LE_2M_RX;
2865
2866 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2867 phys |= BT_PHY_LE_CODED_TX;
2868
2869 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2870 phys |= BT_PHY_LE_CODED_RX;
2871
2872 break;
2873 }
2874
2875 return phys;
2876}
2877
2878static int abort_conn_sync(struct hci_dev *hdev, void *data)
2879{
2880 struct hci_conn *conn = data;
2881
2882 if (!hci_conn_valid(hdev, conn))
2883 return -ECANCELED;
2884
2885 return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
2886}
2887
2888int hci_abort_conn(struct hci_conn *conn, u8 reason)
2889{
2890 struct hci_dev *hdev = conn->hdev;
2891
2892 /* If abort_reason has already been set it means the connection is
2893 * already being aborted so don't attempt to overwrite it.
2894 */
2895 if (conn->abort_reason)
2896 return 0;
2897
2898 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
2899
2900 conn->abort_reason = reason;
2901
2902 /* If the connection is pending check the command opcode since that
2903 * might be blocking on hci_cmd_sync_work while waiting its respective
2904 * event so we need to hci_cmd_sync_cancel to cancel it.
2905 *
2906 * hci_connect_le serializes the connection attempts so only one
2907 * connection can be in BT_CONNECT at time.
2908 */
2909 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
2910 switch (hci_skb_event(hdev->sent_cmd)) {
2911 case HCI_EV_CONN_COMPLETE:
2912 case HCI_EV_LE_CONN_COMPLETE:
2913 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
2914 case HCI_EVT_LE_CIS_ESTABLISHED:
2915 hci_cmd_sync_cancel(hdev, ECANCELED);
2916 break;
2917 }
2918 /* Cancel connect attempt if still queued/pending */
2919 } else if (!hci_cancel_connect_sync(hdev, conn)) {
2920 return 0;
2921 }
2922
2923 /* Run immediately if on cmd_sync_work since this may be called
2924 * as a result to MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR which does
2925 * already queue its callback on cmd_sync_work.
2926 */
2927 return hci_cmd_sync_run_once(hdev, abort_conn_sync, conn, NULL);
2928}
2929
2930void hci_setup_tx_timestamp(struct sk_buff *skb, size_t key_offset,
2931 const struct sockcm_cookie *sockc)
2932{
2933 struct sock *sk = skb ? skb->sk : NULL;
2934 int key;
2935
2936 /* This shall be called on a single skb of those generated by user
2937 * sendmsg(), and only when the sendmsg() does not return error to
2938 * user. This is required for keeping the tskey that increments here in
2939 * sync with possible sendmsg() counting by user.
2940 *
2941 * Stream sockets shall set key_offset to sendmsg() length in bytes
2942 * and call with the last fragment, others to 1 and first fragment.
2943 */
2944
2945 if (!skb || !sockc || !sk || !key_offset)
2946 return;
2947
2948 sock_tx_timestamp(sk, sockc, &skb_shinfo(skb)->tx_flags);
2949
2950 if (sk->sk_type == SOCK_STREAM)
2951 key = atomic_add_return(key_offset, &sk->sk_tskey);
2952
2953 if (sockc->tsflags & SOF_TIMESTAMPING_OPT_ID &&
2954 sockc->tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) {
2955 if (sockc->tsflags & SOCKCM_FLAG_TS_OPT_ID) {
2956 skb_shinfo(skb)->tskey = sockc->ts_opt_id;
2957 } else {
2958 if (sk->sk_type != SOCK_STREAM)
2959 key = atomic_inc_return(&sk->sk_tskey);
2960 skb_shinfo(skb)->tskey = key - 1;
2961 }
2962 }
2963}
2964
2965void hci_conn_tx_queue(struct hci_conn *conn, struct sk_buff *skb)
2966{
2967 struct tx_queue *comp = &conn->tx_q;
2968 bool track = false;
2969
2970 /* Emit SND now, ie. just before sending to driver */
2971 if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP)
2972 __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SND);
2973
2974 /* COMPLETION tstamp is emitted for tracked skb later in Number of
2975 * Completed Packets event. Available only for flow controlled cases.
2976 *
2977 * TODO: SCO support without flowctl (needs to be done in drivers)
2978 */
2979 switch (conn->type) {
2980 case CIS_LINK:
2981 case BIS_LINK:
2982 case ACL_LINK:
2983 case LE_LINK:
2984 break;
2985 case SCO_LINK:
2986 case ESCO_LINK:
2987 if (!hci_dev_test_flag(conn->hdev, HCI_SCO_FLOWCTL))
2988 return;
2989 break;
2990 default:
2991 return;
2992 }
2993
2994 if (skb->sk && (skb_shinfo(skb)->tx_flags & SKBTX_COMPLETION_TSTAMP))
2995 track = true;
2996
2997 /* If nothing is tracked, just count extra skbs at the queue head */
2998 if (!track && !comp->tracked) {
2999 comp->extra++;
3000 return;
3001 }
3002
3003 if (track) {
3004 skb = skb_clone_sk(skb);
3005 if (!skb)
3006 goto count_only;
3007
3008 comp->tracked++;
3009 } else {
3010 skb = skb_clone(skb, GFP_KERNEL);
3011 if (!skb)
3012 goto count_only;
3013 }
3014
3015 skb_queue_tail(&comp->queue, skb);
3016 return;
3017
3018count_only:
3019 /* Stop tracking skbs, and only count. This will not emit timestamps for
3020 * the packets, but if we get here something is more seriously wrong.
3021 */
3022 comp->tracked = 0;
3023 comp->extra += skb_queue_len(&comp->queue) + 1;
3024 skb_queue_purge(&comp->queue);
3025}
3026
3027void hci_conn_tx_dequeue(struct hci_conn *conn)
3028{
3029 struct tx_queue *comp = &conn->tx_q;
3030 struct sk_buff *skb;
3031
3032 /* If there are tracked skbs, the counted extra go before dequeuing real
3033 * skbs, to keep ordering. When nothing is tracked, the ordering doesn't
3034 * matter so dequeue real skbs first to get rid of them ASAP.
3035 */
3036 if (comp->extra && (comp->tracked || skb_queue_empty(&comp->queue))) {
3037 comp->extra--;
3038 return;
3039 }
3040
3041 skb = skb_dequeue(&comp->queue);
3042 if (!skb)
3043 return;
3044
3045 if (skb->sk) {
3046 comp->tracked--;
3047 __skb_tstamp_tx(skb, NULL, NULL, skb->sk,
3048 SCM_TSTAMP_COMPLETION);
3049 }
3050
3051 kfree_skb(skb);
3052}
3053
3054u8 *hci_conn_key_enc_size(struct hci_conn *conn)
3055{
3056 if (conn->type == ACL_LINK) {
3057 struct link_key *key;
3058
3059 key = hci_find_link_key(conn->hdev, &conn->dst);
3060 if (!key)
3061 return NULL;
3062
3063 return &key->pin_len;
3064 } else if (conn->type == LE_LINK) {
3065 struct smp_ltk *ltk;
3066
3067 ltk = hci_find_ltk(conn->hdev, &conn->dst, conn->dst_type,
3068 conn->role);
3069 if (!ltk)
3070 return NULL;
3071
3072 return &ltk->enc_size;
3073 }
3074
3075 return NULL;
3076}
3077
3078int hci_ethtool_ts_info(unsigned int index, int sk_proto,
3079 struct kernel_ethtool_ts_info *info)
3080{
3081 struct hci_dev *hdev;
3082
3083 hdev = hci_dev_get(index);
3084 if (!hdev)
3085 return -ENODEV;
3086
3087 info->so_timestamping =
3088 SOF_TIMESTAMPING_RX_SOFTWARE |
3089 SOF_TIMESTAMPING_SOFTWARE;
3090 info->phc_index = -1;
3091 info->tx_types = BIT(HWTSTAMP_TX_OFF);
3092 info->rx_filters = BIT(HWTSTAMP_FILTER_NONE);
3093
3094 switch (sk_proto) {
3095 case BTPROTO_ISO:
3096 case BTPROTO_L2CAP:
3097 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
3098 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION;
3099 break;
3100 case BTPROTO_SCO:
3101 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
3102 if (hci_dev_test_flag(hdev, HCI_SCO_FLOWCTL))
3103 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION;
3104 break;
3105 }
3106
3107 hci_dev_put(hdev);
3108 return 0;
3109}
Linux 6.x block layer and io_uring tree(s)