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