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