1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4 Copyright 2023-2024 NXP
5
6 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License version 2 as
10 published by the Free Software Foundation;
11
12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
13 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
15 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
16 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
17 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20
21 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
22 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
23 SOFTWARE IS DISCLAIMED.
24 */
25
26 /* Bluetooth HCI connection handling. */
27
28 #include <linux/export.h>
29 #include <linux/debugfs.h>
30 #include <linux/errqueue.h>
31
32 #include <net/bluetooth/bluetooth.h>
33 #include <net/bluetooth/hci_core.h>
34 #include <net/bluetooth/l2cap.h>
35 #include <net/bluetooth/iso.h>
36 #include <net/bluetooth/mgmt.h>
37
38 #include "smp.h"
39 #include "eir.h"
40
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, status);
111
112 /* The connection attempt was doing scan for new RPA, and is
113 * in scan phase. If params are not associated with any other
114 * autoconnect action, remove them completely. If they are, just unmark
115 * them as waiting for connection, by clearing explicit_connect field.
116 */
117 params->explicit_connect = false;
118
119 hci_pend_le_list_del_init(params);
120
121 switch (params->auto_connect) {
122 case HCI_AUTO_CONN_EXPLICIT:
123 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
124 /* return instead of break to avoid duplicate scan update */
125 return;
126 case HCI_AUTO_CONN_DIRECT:
127 case HCI_AUTO_CONN_ALWAYS:
128 hci_pend_le_list_add(params, &hdev->pend_le_conns);
129 break;
130 case HCI_AUTO_CONN_REPORT:
131 hci_pend_le_list_add(params, &hdev->pend_le_reports);
132 break;
133 default:
134 break;
135 }
136
137 hci_update_passive_scan(hdev);
138 }
139
hci_conn_cleanup(struct hci_conn * conn)140 static void hci_conn_cleanup(struct hci_conn *conn)
141 {
142 struct hci_dev *hdev = conn->hdev;
143
144 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
145 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
146
147 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
148 hci_remove_link_key(hdev, &conn->dst);
149
150 hci_chan_list_flush(conn);
151
152 if (HCI_CONN_HANDLE_UNSET(conn->handle))
153 ida_free(&hdev->unset_handle_ida, conn->handle);
154
155 if (conn->cleanup)
156 conn->cleanup(conn);
157
158 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
159 switch (conn->setting & SCO_AIRMODE_MASK) {
160 case SCO_AIRMODE_CVSD:
161 case SCO_AIRMODE_TRANSP:
162 if (hdev->notify)
163 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
164 break;
165 }
166 } else {
167 if (hdev->notify)
168 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
169 }
170
171 debugfs_remove_recursive(conn->debugfs);
172
173 hci_conn_del_sysfs(conn);
174
175 hci_dev_put(hdev);
176 }
177
hci_disconnect(struct hci_conn * conn,__u8 reason)178 int hci_disconnect(struct hci_conn *conn, __u8 reason)
179 {
180 BT_DBG("hcon %p", conn);
181
182 /* When we are central of an established connection and it enters
183 * the disconnect timeout, then go ahead and try to read the
184 * current clock offset. Processing of the result is done
185 * within the event handling and hci_clock_offset_evt function.
186 */
187 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
188 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
189 struct hci_dev *hdev = conn->hdev;
190 struct hci_cp_read_clock_offset clkoff_cp;
191
192 clkoff_cp.handle = cpu_to_le16(conn->handle);
193 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
194 &clkoff_cp);
195 }
196
197 return hci_abort_conn(conn, reason);
198 }
199
hci_add_sco(struct hci_conn * conn,__u16 handle)200 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
201 {
202 struct hci_dev *hdev = conn->hdev;
203 struct hci_cp_add_sco cp;
204
205 BT_DBG("hcon %p", conn);
206
207 conn->state = BT_CONNECT;
208 conn->out = true;
209
210 conn->attempt++;
211
212 cp.handle = cpu_to_le16(handle);
213 cp.pkt_type = cpu_to_le16(conn->pkt_type);
214
215 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
216 }
217
find_next_esco_param(struct hci_conn * conn,const struct sco_param * esco_param,int size)218 static bool find_next_esco_param(struct hci_conn *conn,
219 const struct sco_param *esco_param, int size)
220 {
221 if (!conn->parent)
222 return false;
223
224 for (; conn->attempt <= size; conn->attempt++) {
225 if (lmp_esco_2m_capable(conn->parent) ||
226 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
227 break;
228 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
229 conn, conn->attempt);
230 }
231
232 return conn->attempt <= size;
233 }
234
configure_datapath_sync(struct hci_dev * hdev,struct bt_codec * codec)235 static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
236 {
237 int err;
238 __u8 vnd_len, *vnd_data = NULL;
239 struct hci_op_configure_data_path *cmd = NULL;
240
241 /* Do not take below 2 checks as error since the 1st means user do not
242 * want to use HFP offload mode and the 2nd means the vendor controller
243 * do not need to send below HCI command for offload mode.
244 */
245 if (!codec->data_path || !hdev->get_codec_config_data)
246 return 0;
247
248 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
249 &vnd_data);
250 if (err < 0)
251 goto error;
252
253 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
254 if (!cmd) {
255 err = -ENOMEM;
256 goto error;
257 }
258
259 err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
260 if (err < 0)
261 goto error;
262
263 cmd->vnd_len = vnd_len;
264 memcpy(cmd->vnd_data, vnd_data, vnd_len);
265
266 cmd->direction = 0x00;
267 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
268 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
269
270 cmd->direction = 0x01;
271 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
272 sizeof(*cmd) + vnd_len, cmd,
273 HCI_CMD_TIMEOUT);
274 error:
275
276 kfree(cmd);
277 kfree(vnd_data);
278 return err;
279 }
280
hci_enhanced_setup_sync(struct hci_dev * hdev,void * data)281 static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
282 {
283 struct conn_handle_t *conn_handle = data;
284 struct hci_conn *conn = conn_handle->conn;
285 __u16 handle = conn_handle->handle;
286 struct hci_cp_enhanced_setup_sync_conn cp;
287 const struct sco_param *param;
288
289 kfree(conn_handle);
290
291 if (!hci_conn_valid(hdev, conn))
292 return -ECANCELED;
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 -EINVAL;
341
342 param = &esco_param_msbc[conn->attempt - 1];
343 cp.tx_coding_format.id = 0x03;
344 cp.rx_coding_format.id = 0x03;
345 cp.tx_codec_frame_size = __cpu_to_le16(60);
346 cp.rx_codec_frame_size = __cpu_to_le16(60);
347 cp.in_bandwidth = __cpu_to_le32(0x1f40);
348 cp.out_bandwidth = __cpu_to_le32(0x1f40);
349 cp.in_coding_format.id = 0x03;
350 cp.out_coding_format.id = 0x03;
351 cp.in_coded_data_size = __cpu_to_le16(16);
352 cp.out_coded_data_size = __cpu_to_le16(16);
353 cp.in_pcm_data_format = 2;
354 cp.out_pcm_data_format = 2;
355 cp.in_pcm_sample_payload_msb_pos = 0;
356 cp.out_pcm_sample_payload_msb_pos = 0;
357 cp.in_data_path = conn->codec.data_path;
358 cp.out_data_path = conn->codec.data_path;
359 cp.in_transport_unit_size = 1;
360 cp.out_transport_unit_size = 1;
361 break;
362
363 case BT_CODEC_CVSD:
364 if (conn->parent && lmp_esco_capable(conn->parent)) {
365 if (!find_next_esco_param(conn, esco_param_cvsd,
366 ARRAY_SIZE(esco_param_cvsd)))
367 return -EINVAL;
368 param = &esco_param_cvsd[conn->attempt - 1];
369 } else {
370 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
371 return -EINVAL;
372 param = &sco_param_cvsd[conn->attempt - 1];
373 }
374 cp.tx_coding_format.id = 2;
375 cp.rx_coding_format.id = 2;
376 cp.tx_codec_frame_size = __cpu_to_le16(60);
377 cp.rx_codec_frame_size = __cpu_to_le16(60);
378 cp.in_bandwidth = __cpu_to_le32(16000);
379 cp.out_bandwidth = __cpu_to_le32(16000);
380 cp.in_coding_format.id = 4;
381 cp.out_coding_format.id = 4;
382 cp.in_coded_data_size = __cpu_to_le16(16);
383 cp.out_coded_data_size = __cpu_to_le16(16);
384 cp.in_pcm_data_format = 2;
385 cp.out_pcm_data_format = 2;
386 cp.in_pcm_sample_payload_msb_pos = 0;
387 cp.out_pcm_sample_payload_msb_pos = 0;
388 cp.in_data_path = conn->codec.data_path;
389 cp.out_data_path = conn->codec.data_path;
390 cp.in_transport_unit_size = 16;
391 cp.out_transport_unit_size = 16;
392 break;
393 default:
394 return -EINVAL;
395 }
396
397 cp.retrans_effort = param->retrans_effort;
398 cp.pkt_type = __cpu_to_le16(param->pkt_type);
399 cp.max_latency = __cpu_to_le16(param->max_latency);
400
401 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
402 return -EIO;
403
404 return 0;
405 }
406
hci_setup_sync_conn(struct hci_conn * conn,__u16 handle)407 static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
408 {
409 struct hci_dev *hdev = conn->hdev;
410 struct hci_cp_setup_sync_conn cp;
411 const struct sco_param *param;
412
413 bt_dev_dbg(hdev, "hcon %p", conn);
414
415 conn->state = BT_CONNECT;
416 conn->out = true;
417
418 conn->attempt++;
419
420 cp.handle = cpu_to_le16(handle);
421
422 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
423 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
424 cp.voice_setting = cpu_to_le16(conn->setting);
425
426 switch (conn->setting & SCO_AIRMODE_MASK) {
427 case SCO_AIRMODE_TRANSP:
428 if (!find_next_esco_param(conn, esco_param_msbc,
429 ARRAY_SIZE(esco_param_msbc)))
430 return false;
431 param = &esco_param_msbc[conn->attempt - 1];
432 break;
433 case SCO_AIRMODE_CVSD:
434 if (conn->parent && lmp_esco_capable(conn->parent)) {
435 if (!find_next_esco_param(conn, esco_param_cvsd,
436 ARRAY_SIZE(esco_param_cvsd)))
437 return false;
438 param = &esco_param_cvsd[conn->attempt - 1];
439 } else {
440 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
441 return false;
442 param = &sco_param_cvsd[conn->attempt - 1];
443 }
444 break;
445 default:
446 return false;
447 }
448
449 cp.retrans_effort = param->retrans_effort;
450 cp.pkt_type = __cpu_to_le16(param->pkt_type);
451 cp.max_latency = __cpu_to_le16(param->max_latency);
452
453 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
454 return false;
455
456 return true;
457 }
458
hci_setup_sync(struct hci_conn * conn,__u16 handle)459 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
460 {
461 int result;
462 struct conn_handle_t *conn_handle;
463
464 if (enhanced_sync_conn_capable(conn->hdev)) {
465 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
466
467 if (!conn_handle)
468 return false;
469
470 conn_handle->conn = conn;
471 conn_handle->handle = handle;
472 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
473 conn_handle, NULL);
474 if (result < 0)
475 kfree(conn_handle);
476
477 return result == 0;
478 }
479
480 return hci_setup_sync_conn(conn, handle);
481 }
482
hci_le_conn_update(struct hci_conn * conn,u16 min,u16 max,u16 latency,u16 to_multiplier)483 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
484 u16 to_multiplier)
485 {
486 struct hci_dev *hdev = conn->hdev;
487 struct hci_conn_params *params;
488 struct hci_cp_le_conn_update cp;
489
490 hci_dev_lock(hdev);
491
492 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
493 if (params) {
494 params->conn_min_interval = min;
495 params->conn_max_interval = max;
496 params->conn_latency = latency;
497 params->supervision_timeout = to_multiplier;
498 }
499
500 hci_dev_unlock(hdev);
501
502 memset(&cp, 0, sizeof(cp));
503 cp.handle = cpu_to_le16(conn->handle);
504 cp.conn_interval_min = cpu_to_le16(min);
505 cp.conn_interval_max = cpu_to_le16(max);
506 cp.conn_latency = cpu_to_le16(latency);
507 cp.supervision_timeout = cpu_to_le16(to_multiplier);
508 cp.min_ce_len = cpu_to_le16(0x0000);
509 cp.max_ce_len = cpu_to_le16(0x0000);
510
511 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
512
513 if (params)
514 return 0x01;
515
516 return 0x00;
517 }
518
hci_le_start_enc(struct hci_conn * conn,__le16 ediv,__le64 rand,__u8 ltk[16],__u8 key_size)519 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
520 __u8 ltk[16], __u8 key_size)
521 {
522 struct hci_dev *hdev = conn->hdev;
523 struct hci_cp_le_start_enc cp;
524
525 BT_DBG("hcon %p", conn);
526
527 memset(&cp, 0, sizeof(cp));
528
529 cp.handle = cpu_to_le16(conn->handle);
530 cp.rand = rand;
531 cp.ediv = ediv;
532 memcpy(cp.ltk, ltk, key_size);
533
534 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
535 }
536
537 /* Device _must_ be locked */
hci_sco_setup(struct hci_conn * conn,__u8 status)538 void hci_sco_setup(struct hci_conn *conn, __u8 status)
539 {
540 struct hci_link *link;
541
542 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
543 if (!link || !link->conn)
544 return;
545
546 BT_DBG("hcon %p", conn);
547
548 if (!status) {
549 if (lmp_esco_capable(conn->hdev))
550 hci_setup_sync(link->conn, conn->handle);
551 else
552 hci_add_sco(link->conn, conn->handle);
553 } else {
554 hci_connect_cfm(link->conn, status);
555 hci_conn_del(link->conn);
556 }
557 }
558
hci_conn_timeout(struct work_struct * work)559 static void hci_conn_timeout(struct work_struct *work)
560 {
561 struct hci_conn *conn = container_of(work, struct hci_conn,
562 disc_work.work);
563 int refcnt = atomic_read(&conn->refcnt);
564
565 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
566
567 WARN_ON(refcnt < 0);
568
569 /* FIXME: It was observed that in pairing failed scenario, refcnt
570 * drops below 0. Probably this is because l2cap_conn_del calls
571 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
572 * dropped. After that loop hci_chan_del is called which also drops
573 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
574 * otherwise drop it.
575 */
576 if (refcnt > 0)
577 return;
578
579 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
580 }
581
582 /* Enter sniff mode */
hci_conn_idle(struct work_struct * work)583 static void hci_conn_idle(struct work_struct *work)
584 {
585 struct hci_conn *conn = container_of(work, struct hci_conn,
586 idle_work.work);
587 struct hci_dev *hdev = conn->hdev;
588
589 BT_DBG("hcon %p mode %d", conn, conn->mode);
590
591 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
592 return;
593
594 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
595 return;
596
597 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
598 struct hci_cp_sniff_subrate cp;
599 cp.handle = cpu_to_le16(conn->handle);
600 cp.max_latency = cpu_to_le16(0);
601 cp.min_remote_timeout = cpu_to_le16(0);
602 cp.min_local_timeout = cpu_to_le16(0);
603 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
604 }
605
606 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
607 struct hci_cp_sniff_mode cp;
608 cp.handle = cpu_to_le16(conn->handle);
609 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
610 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
611 cp.attempt = cpu_to_le16(4);
612 cp.timeout = cpu_to_le16(1);
613 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
614 }
615 }
616
hci_conn_auto_accept(struct work_struct * work)617 static void hci_conn_auto_accept(struct work_struct *work)
618 {
619 struct hci_conn *conn = container_of(work, struct hci_conn,
620 auto_accept_work.work);
621
622 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
623 &conn->dst);
624 }
625
le_disable_advertising(struct hci_dev * hdev)626 static void le_disable_advertising(struct hci_dev *hdev)
627 {
628 if (ext_adv_capable(hdev)) {
629 struct hci_cp_le_set_ext_adv_enable cp;
630
631 cp.enable = 0x00;
632 cp.num_of_sets = 0x00;
633
634 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
635 &cp);
636 } else {
637 u8 enable = 0x00;
638 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
639 &enable);
640 }
641 }
642
le_conn_timeout(struct work_struct * work)643 static void le_conn_timeout(struct work_struct *work)
644 {
645 struct hci_conn *conn = container_of(work, struct hci_conn,
646 le_conn_timeout.work);
647 struct hci_dev *hdev = conn->hdev;
648
649 BT_DBG("");
650
651 /* We could end up here due to having done directed advertising,
652 * so clean up the state if necessary. This should however only
653 * happen with broken hardware or if low duty cycle was used
654 * (which doesn't have a timeout of its own).
655 */
656 if (conn->role == HCI_ROLE_SLAVE) {
657 /* Disable LE Advertising */
658 le_disable_advertising(hdev);
659 hci_dev_lock(hdev);
660 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
661 hci_dev_unlock(hdev);
662 return;
663 }
664
665 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
666 }
667
668 struct iso_list_data {
669 union {
670 u8 cig;
671 u8 big;
672 };
673 union {
674 u8 cis;
675 u8 bis;
676 u16 sync_handle;
677 };
678 int count;
679 bool big_term;
680 bool pa_sync_term;
681 bool big_sync_term;
682 };
683
bis_list(struct hci_conn * conn,void * data)684 static void bis_list(struct hci_conn *conn, void *data)
685 {
686 struct iso_list_data *d = data;
687
688 /* Skip if not broadcast/ANY address */
689 if (bacmp(&conn->dst, BDADDR_ANY))
690 return;
691
692 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
693 d->bis != conn->iso_qos.bcast.bis)
694 return;
695
696 d->count++;
697 }
698
terminate_big_sync(struct hci_dev * hdev,void * data)699 static int terminate_big_sync(struct hci_dev *hdev, void *data)
700 {
701 struct iso_list_data *d = data;
702
703 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
704
705 hci_disable_per_advertising_sync(hdev, d->bis);
706 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
707
708 /* Only terminate BIG if it has been created */
709 if (!d->big_term)
710 return 0;
711
712 return hci_le_terminate_big_sync(hdev, d->big,
713 HCI_ERROR_LOCAL_HOST_TERM);
714 }
715
terminate_big_destroy(struct hci_dev * hdev,void * data,int err)716 static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
717 {
718 kfree(data);
719 }
720
hci_le_terminate_big(struct hci_dev * hdev,struct hci_conn * conn)721 static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
722 {
723 struct iso_list_data *d;
724 int ret;
725
726 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
727 conn->iso_qos.bcast.bis);
728
729 d = kzalloc(sizeof(*d), GFP_KERNEL);
730 if (!d)
731 return -ENOMEM;
732
733 d->big = conn->iso_qos.bcast.big;
734 d->bis = conn->iso_qos.bcast.bis;
735 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
736
737 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
738 terminate_big_destroy);
739 if (ret)
740 kfree(d);
741
742 return ret;
743 }
744
big_terminate_sync(struct hci_dev * hdev,void * data)745 static int big_terminate_sync(struct hci_dev *hdev, void *data)
746 {
747 struct iso_list_data *d = data;
748
749 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
750 d->sync_handle);
751
752 if (d->big_sync_term)
753 hci_le_big_terminate_sync(hdev, d->big);
754
755 if (d->pa_sync_term)
756 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
757
758 return 0;
759 }
760
find_bis(struct hci_conn * conn,void * data)761 static void find_bis(struct hci_conn *conn, void *data)
762 {
763 struct iso_list_data *d = data;
764
765 /* Ignore if BIG doesn't match */
766 if (d->big != conn->iso_qos.bcast.big)
767 return;
768
769 d->count++;
770 }
771
hci_le_big_terminate(struct hci_dev * hdev,u8 big,struct hci_conn * conn)772 static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
773 {
774 struct iso_list_data *d;
775 int ret;
776
777 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
778
779 d = kzalloc(sizeof(*d), GFP_KERNEL);
780 if (!d)
781 return -ENOMEM;
782
783 d->big = big;
784 d->sync_handle = conn->sync_handle;
785
786 if (test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
787 hci_conn_hash_list_flag(hdev, find_bis, PA_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, BIS_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: Terminate 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_state(hdev,
833 conn->iso_qos.bcast.big,
834 BT_CONNECTED,
835 HCI_ROLE_MASTER);
836 if (bis)
837 return;
838
839 bis = hci_conn_hash_lookup_big_state(hdev,
840 conn->iso_qos.bcast.big,
841 BT_CONNECT,
842 HCI_ROLE_MASTER);
843 if (bis)
844 return;
845
846 hci_le_terminate_big(hdev, conn);
847 } else {
848 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
849 conn);
850 }
851 }
852
remove_cig_sync(struct hci_dev * hdev,void * data)853 static int remove_cig_sync(struct hci_dev *hdev, void *data)
854 {
855 u8 handle = PTR_UINT(data);
856
857 return hci_le_remove_cig_sync(hdev, handle);
858 }
859
hci_le_remove_cig(struct hci_dev * hdev,u8 handle)860 static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
861 {
862 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
863
864 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
865 NULL);
866 }
867
find_cis(struct hci_conn * conn,void * data)868 static void find_cis(struct hci_conn *conn, void *data)
869 {
870 struct iso_list_data *d = data;
871
872 /* Ignore broadcast or if CIG don't match */
873 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
874 return;
875
876 d->count++;
877 }
878
879 /* Cleanup CIS connection:
880 *
881 * Detects if there any CIS left connected in a CIG and remove it.
882 */
cis_cleanup(struct hci_conn * conn)883 static void cis_cleanup(struct hci_conn *conn)
884 {
885 struct hci_dev *hdev = conn->hdev;
886 struct iso_list_data d;
887
888 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
889 return;
890
891 memset(&d, 0, sizeof(d));
892 d.cig = conn->iso_qos.ucast.cig;
893
894 /* Check if ISO connection is a CIS and remove CIG if there are
895 * no other connections using it.
896 */
897 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_BOUND, &d);
898 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECT,
899 &d);
900 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECTED,
901 &d);
902 if (d.count)
903 return;
904
905 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
906 }
907
hci_conn_hash_alloc_unset(struct hci_dev * hdev)908 static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
909 {
910 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
911 U16_MAX, GFP_ATOMIC);
912 }
913
__hci_conn_add(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 role,u16 handle)914 static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
915 u8 role, u16 handle)
916 {
917 struct hci_conn *conn;
918
919 switch (type) {
920 case ACL_LINK:
921 if (!hdev->acl_mtu)
922 return ERR_PTR(-ECONNREFUSED);
923 break;
924 case CIS_LINK:
925 case BIS_LINK:
926 case PA_LINK:
927 if (!hdev->iso_mtu)
928 return ERR_PTR(-ECONNREFUSED);
929 break;
930 case LE_LINK:
931 if (hdev->le_mtu && hdev->le_mtu < HCI_MIN_LE_MTU)
932 return ERR_PTR(-ECONNREFUSED);
933 if (!hdev->le_mtu && hdev->acl_mtu < HCI_MIN_LE_MTU)
934 return ERR_PTR(-ECONNREFUSED);
935 break;
936 case SCO_LINK:
937 case ESCO_LINK:
938 if (!hdev->sco_pkts)
939 /* Controller does not support SCO or eSCO over HCI */
940 return ERR_PTR(-ECONNREFUSED);
941 break;
942 default:
943 return ERR_PTR(-ECONNREFUSED);
944 }
945
946 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
947
948 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
949 if (!conn)
950 return ERR_PTR(-ENOMEM);
951
952 bacpy(&conn->dst, dst);
953 bacpy(&conn->src, &hdev->bdaddr);
954 conn->handle = handle;
955 conn->hdev = hdev;
956 conn->type = type;
957 conn->role = role;
958 conn->mode = HCI_CM_ACTIVE;
959 conn->state = BT_OPEN;
960 conn->auth_type = HCI_AT_GENERAL_BONDING;
961 conn->io_capability = hdev->io_capability;
962 conn->remote_auth = 0xff;
963 conn->key_type = 0xff;
964 conn->rssi = HCI_RSSI_INVALID;
965 conn->tx_power = HCI_TX_POWER_INVALID;
966 conn->max_tx_power = HCI_TX_POWER_INVALID;
967 conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
968 conn->sid = HCI_SID_INVALID;
969
970 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
971 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
972
973 /* Set Default Authenticated payload timeout to 30s */
974 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
975
976 if (conn->role == HCI_ROLE_MASTER)
977 conn->out = true;
978
979 switch (type) {
980 case ACL_LINK:
981 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
982 conn->mtu = hdev->acl_mtu;
983 break;
984 case LE_LINK:
985 /* conn->src should reflect the local identity address */
986 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
987 conn->mtu = hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
988 break;
989 case CIS_LINK:
990 case BIS_LINK:
991 case PA_LINK:
992 /* conn->src should reflect the local identity address */
993 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
994
995 /* set proper cleanup function */
996 if (!bacmp(dst, BDADDR_ANY))
997 conn->cleanup = bis_cleanup;
998 else if (conn->role == HCI_ROLE_MASTER)
999 conn->cleanup = cis_cleanup;
1000
1001 conn->mtu = hdev->iso_mtu ? hdev->iso_mtu :
1002 hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
1003 break;
1004 case SCO_LINK:
1005 if (lmp_esco_capable(hdev))
1006 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
1007 (hdev->esco_type & EDR_ESCO_MASK);
1008 else
1009 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1010
1011 conn->mtu = hdev->sco_mtu;
1012 break;
1013 case ESCO_LINK:
1014 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1015 conn->mtu = hdev->sco_mtu;
1016 break;
1017 }
1018
1019 skb_queue_head_init(&conn->data_q);
1020 skb_queue_head_init(&conn->tx_q.queue);
1021
1022 INIT_LIST_HEAD(&conn->chan_list);
1023 INIT_LIST_HEAD(&conn->link_list);
1024
1025 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1026 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1027 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1028 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1029
1030 atomic_set(&conn->refcnt, 0);
1031
1032 hci_dev_hold(hdev);
1033
1034 hci_conn_hash_add(hdev, conn);
1035
1036 /* The SCO and eSCO connections will only be notified when their
1037 * setup has been completed. This is different to ACL links which
1038 * can be notified right away.
1039 */
1040 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1041 if (hdev->notify)
1042 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1043 }
1044
1045 hci_conn_init_sysfs(conn);
1046 return conn;
1047 }
1048
hci_conn_add_unset(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 role)1049 struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1050 bdaddr_t *dst, u8 role)
1051 {
1052 int handle;
1053
1054 bt_dev_dbg(hdev, "dst %pMR", dst);
1055
1056 handle = hci_conn_hash_alloc_unset(hdev);
1057 if (unlikely(handle < 0))
1058 return ERR_PTR(-ECONNREFUSED);
1059
1060 return __hci_conn_add(hdev, type, dst, role, handle);
1061 }
1062
hci_conn_add(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 role,u16 handle)1063 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
1064 u8 role, u16 handle)
1065 {
1066 if (handle > HCI_CONN_HANDLE_MAX)
1067 return ERR_PTR(-EINVAL);
1068
1069 return __hci_conn_add(hdev, type, dst, role, handle);
1070 }
1071
hci_conn_cleanup_child(struct hci_conn * conn,u8 reason)1072 static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1073 {
1074 if (!reason)
1075 reason = HCI_ERROR_REMOTE_USER_TERM;
1076
1077 /* Due to race, SCO/ISO conn might be not established yet at this point,
1078 * and nothing else will clean it up. In other cases it is done via HCI
1079 * events.
1080 */
1081 switch (conn->type) {
1082 case SCO_LINK:
1083 case ESCO_LINK:
1084 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1085 hci_conn_failed(conn, reason);
1086 break;
1087 case CIS_LINK:
1088 case BIS_LINK:
1089 case PA_LINK:
1090 if ((conn->state != BT_CONNECTED &&
1091 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) ||
1092 test_bit(HCI_CONN_BIG_CREATED, &conn->flags))
1093 hci_conn_failed(conn, reason);
1094 break;
1095 }
1096 }
1097
hci_conn_unlink(struct hci_conn * conn)1098 static void hci_conn_unlink(struct hci_conn *conn)
1099 {
1100 struct hci_dev *hdev = conn->hdev;
1101
1102 bt_dev_dbg(hdev, "hcon %p", conn);
1103
1104 if (!conn->parent) {
1105 struct hci_link *link, *t;
1106
1107 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1108 struct hci_conn *child = link->conn;
1109
1110 hci_conn_unlink(child);
1111
1112 /* If hdev is down it means
1113 * hci_dev_close_sync/hci_conn_hash_flush is in progress
1114 * and links don't need to be cleanup as all connections
1115 * would be cleanup.
1116 */
1117 if (!test_bit(HCI_UP, &hdev->flags))
1118 continue;
1119
1120 hci_conn_cleanup_child(child, conn->abort_reason);
1121 }
1122
1123 return;
1124 }
1125
1126 if (!conn->link)
1127 return;
1128
1129 list_del_rcu(&conn->link->list);
1130 synchronize_rcu();
1131
1132 hci_conn_drop(conn->parent);
1133 hci_conn_put(conn->parent);
1134 conn->parent = NULL;
1135
1136 kfree(conn->link);
1137 conn->link = NULL;
1138 }
1139
hci_conn_del(struct hci_conn * conn)1140 void hci_conn_del(struct hci_conn *conn)
1141 {
1142 struct hci_dev *hdev = conn->hdev;
1143
1144 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1145
1146 hci_conn_unlink(conn);
1147
1148 disable_delayed_work_sync(&conn->disc_work);
1149 disable_delayed_work_sync(&conn->auto_accept_work);
1150 disable_delayed_work_sync(&conn->idle_work);
1151
1152 /* Remove the connection from the list so unacked logic can detect when
1153 * a certain pool is not being utilized.
1154 */
1155 hci_conn_hash_del(hdev, conn);
1156
1157 /* Handle unacked frames:
1158 *
1159 * - In case there are no connection, or if restoring the buffers
1160 * considered in transist would overflow, restore all buffers to the
1161 * pool.
1162 * - Otherwise restore just the buffers considered in transit for the
1163 * hci_conn
1164 */
1165 switch (conn->type) {
1166 case ACL_LINK:
1167 if (!hci_conn_num(hdev, ACL_LINK) ||
1168 hdev->acl_cnt + conn->sent > hdev->acl_pkts)
1169 hdev->acl_cnt = hdev->acl_pkts;
1170 else
1171 hdev->acl_cnt += conn->sent;
1172 break;
1173 case LE_LINK:
1174 cancel_delayed_work(&conn->le_conn_timeout);
1175
1176 if (hdev->le_pkts) {
1177 if (!hci_conn_num(hdev, LE_LINK) ||
1178 hdev->le_cnt + conn->sent > hdev->le_pkts)
1179 hdev->le_cnt = hdev->le_pkts;
1180 else
1181 hdev->le_cnt += conn->sent;
1182 } else {
1183 if ((!hci_conn_num(hdev, LE_LINK) &&
1184 !hci_conn_num(hdev, ACL_LINK)) ||
1185 hdev->acl_cnt + conn->sent > hdev->acl_pkts)
1186 hdev->acl_cnt = hdev->acl_pkts;
1187 else
1188 hdev->acl_cnt += conn->sent;
1189 }
1190 break;
1191 case CIS_LINK:
1192 case BIS_LINK:
1193 case PA_LINK:
1194 if (!hci_iso_count(hdev) ||
1195 hdev->iso_cnt + conn->sent > hdev->iso_pkts)
1196 hdev->iso_cnt = hdev->iso_pkts;
1197 else
1198 hdev->iso_cnt += conn->sent;
1199 break;
1200 }
1201
1202 skb_queue_purge(&conn->data_q);
1203 skb_queue_purge(&conn->tx_q.queue);
1204
1205 /* Remove the connection from the list and cleanup its remaining
1206 * state. This is a separate function since for some cases like
1207 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1208 * rest of hci_conn_del.
1209 */
1210 hci_conn_cleanup(conn);
1211
1212 /* Dequeue callbacks using connection pointer as data */
1213 hci_cmd_sync_dequeue(hdev, NULL, conn, NULL);
1214 }
1215
hci_get_route(bdaddr_t * dst,bdaddr_t * src,uint8_t src_type)1216 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1217 {
1218 int use_src = bacmp(src, BDADDR_ANY);
1219 struct hci_dev *hdev = NULL, *d;
1220
1221 BT_DBG("%pMR -> %pMR", src, dst);
1222
1223 read_lock(&hci_dev_list_lock);
1224
1225 list_for_each_entry(d, &hci_dev_list, list) {
1226 if (!test_bit(HCI_UP, &d->flags) ||
1227 hci_dev_test_flag(d, HCI_USER_CHANNEL))
1228 continue;
1229
1230 /* Simple routing:
1231 * No source address - find interface with bdaddr != dst
1232 * Source address - find interface with bdaddr == src
1233 */
1234
1235 if (use_src) {
1236 bdaddr_t id_addr;
1237 u8 id_addr_type;
1238
1239 if (src_type == BDADDR_BREDR) {
1240 if (!lmp_bredr_capable(d))
1241 continue;
1242 bacpy(&id_addr, &d->bdaddr);
1243 id_addr_type = BDADDR_BREDR;
1244 } else {
1245 if (!lmp_le_capable(d))
1246 continue;
1247
1248 hci_copy_identity_address(d, &id_addr,
1249 &id_addr_type);
1250
1251 /* Convert from HCI to three-value type */
1252 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1253 id_addr_type = BDADDR_LE_PUBLIC;
1254 else
1255 id_addr_type = BDADDR_LE_RANDOM;
1256 }
1257
1258 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1259 hdev = d; break;
1260 }
1261 } else {
1262 if (bacmp(&d->bdaddr, dst)) {
1263 hdev = d; break;
1264 }
1265 }
1266 }
1267
1268 if (hdev)
1269 hdev = hci_dev_hold(hdev);
1270
1271 read_unlock(&hci_dev_list_lock);
1272 return hdev;
1273 }
1274 EXPORT_SYMBOL(hci_get_route);
1275
1276 /* This function requires the caller holds hdev->lock */
hci_le_conn_failed(struct hci_conn * conn,u8 status)1277 static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1278 {
1279 struct hci_dev *hdev = conn->hdev;
1280
1281 hci_connect_le_scan_cleanup(conn, status);
1282
1283 /* Enable advertising in case this was a failed connection
1284 * attempt as a peripheral.
1285 */
1286 hci_enable_advertising(hdev);
1287 }
1288
1289 /* This function requires the caller holds hdev->lock */
hci_conn_failed(struct hci_conn * conn,u8 status)1290 void hci_conn_failed(struct hci_conn *conn, u8 status)
1291 {
1292 struct hci_dev *hdev = conn->hdev;
1293
1294 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1295
1296 switch (conn->type) {
1297 case LE_LINK:
1298 hci_le_conn_failed(conn, status);
1299 break;
1300 case ACL_LINK:
1301 mgmt_connect_failed(hdev, conn, status);
1302 break;
1303 }
1304
1305 /* In case of BIG/PA sync failed, clear conn flags so that
1306 * the conns will be correctly cleaned up by ISO layer
1307 */
1308 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1309 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1310
1311 conn->state = BT_CLOSED;
1312 hci_connect_cfm(conn, status);
1313 hci_conn_del(conn);
1314 }
1315
1316 /* This function requires the caller holds hdev->lock */
hci_conn_set_handle(struct hci_conn * conn,u16 handle)1317 u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1318 {
1319 struct hci_dev *hdev = conn->hdev;
1320
1321 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1322
1323 if (conn->handle == handle)
1324 return 0;
1325
1326 if (handle > HCI_CONN_HANDLE_MAX) {
1327 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1328 handle, HCI_CONN_HANDLE_MAX);
1329 return HCI_ERROR_INVALID_PARAMETERS;
1330 }
1331
1332 /* If abort_reason has been sent it means the connection is being
1333 * aborted and the handle shall not be changed.
1334 */
1335 if (conn->abort_reason)
1336 return conn->abort_reason;
1337
1338 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1339 ida_free(&hdev->unset_handle_ida, conn->handle);
1340
1341 conn->handle = handle;
1342
1343 return 0;
1344 }
1345
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)1346 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1347 u8 dst_type, bool dst_resolved, u8 sec_level,
1348 u16 conn_timeout, u8 role, u8 phy, u8 sec_phy)
1349 {
1350 struct hci_conn *conn;
1351 struct smp_irk *irk;
1352 int err;
1353
1354 /* Let's make sure that le is enabled.*/
1355 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1356 if (lmp_le_capable(hdev))
1357 return ERR_PTR(-ECONNREFUSED);
1358
1359 return ERR_PTR(-EOPNOTSUPP);
1360 }
1361
1362 /* Since the controller supports only one LE connection attempt at a
1363 * time, we return -EBUSY if there is any connection attempt running.
1364 */
1365 if (hci_lookup_le_connect(hdev))
1366 return ERR_PTR(-EBUSY);
1367
1368 /* If there's already a connection object but it's not in
1369 * scanning state it means it must already be established, in
1370 * which case we can't do anything else except report a failure
1371 * to connect.
1372 */
1373 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1374 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1375 return ERR_PTR(-EBUSY);
1376 }
1377
1378 /* Check if the destination address has been resolved by the controller
1379 * since if it did then the identity address shall be used.
1380 */
1381 if (!dst_resolved) {
1382 /* When given an identity address with existing identity
1383 * resolving key, the connection needs to be established
1384 * to a resolvable random address.
1385 *
1386 * Storing the resolvable random address is required here
1387 * to handle connection failures. The address will later
1388 * be resolved back into the original identity address
1389 * from the connect request.
1390 */
1391 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1392 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1393 dst = &irk->rpa;
1394 dst_type = ADDR_LE_DEV_RANDOM;
1395 }
1396 }
1397
1398 if (conn) {
1399 bacpy(&conn->dst, dst);
1400 } else {
1401 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1402 if (IS_ERR(conn))
1403 return conn;
1404 hci_conn_hold(conn);
1405 conn->pending_sec_level = sec_level;
1406 }
1407
1408 conn->dst_type = dst_type;
1409 conn->sec_level = BT_SECURITY_LOW;
1410 conn->conn_timeout = conn_timeout;
1411 conn->le_adv_phy = phy;
1412 conn->le_adv_sec_phy = sec_phy;
1413
1414 err = hci_connect_le_sync(hdev, conn);
1415 if (err) {
1416 hci_conn_del(conn);
1417 return ERR_PTR(err);
1418 }
1419
1420 return conn;
1421 }
1422
is_connected(struct hci_dev * hdev,bdaddr_t * addr,u8 type)1423 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1424 {
1425 struct hci_conn *conn;
1426
1427 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1428 if (!conn)
1429 return false;
1430
1431 if (conn->state != BT_CONNECTED)
1432 return false;
1433
1434 return true;
1435 }
1436
1437 /* This function requires the caller holds hdev->lock */
hci_explicit_conn_params_set(struct hci_dev * hdev,bdaddr_t * addr,u8 addr_type)1438 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1439 bdaddr_t *addr, u8 addr_type)
1440 {
1441 struct hci_conn_params *params;
1442
1443 if (is_connected(hdev, addr, addr_type))
1444 return -EISCONN;
1445
1446 params = hci_conn_params_lookup(hdev, addr, addr_type);
1447 if (!params) {
1448 params = hci_conn_params_add(hdev, addr, addr_type);
1449 if (!params)
1450 return -ENOMEM;
1451
1452 /* If we created new params, mark them to be deleted in
1453 * hci_connect_le_scan_cleanup. It's different case than
1454 * existing disabled params, those will stay after cleanup.
1455 */
1456 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1457 }
1458
1459 /* We're trying to connect, so make sure params are at pend_le_conns */
1460 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1461 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1462 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1463 hci_pend_le_list_del_init(params);
1464 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1465 }
1466
1467 params->explicit_connect = true;
1468
1469 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1470 params->auto_connect);
1471
1472 return 0;
1473 }
1474
qos_set_big(struct hci_dev * hdev,struct bt_iso_qos * qos)1475 static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1476 {
1477 struct hci_conn *conn;
1478 u8 big;
1479
1480 /* Allocate a BIG if not set */
1481 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1482 for (big = 0x00; big < 0xef; big++) {
1483
1484 conn = hci_conn_hash_lookup_big(hdev, big);
1485 if (!conn)
1486 break;
1487 }
1488
1489 if (big == 0xef)
1490 return -EADDRNOTAVAIL;
1491
1492 /* Update BIG */
1493 qos->bcast.big = big;
1494 }
1495
1496 return 0;
1497 }
1498
qos_set_bis(struct hci_dev * hdev,struct bt_iso_qos * qos)1499 static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1500 {
1501 struct hci_conn *conn;
1502 u8 bis;
1503
1504 /* Allocate BIS if not set */
1505 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1506 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1507 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1508
1509 if (conn) {
1510 /* If the BIG handle is already matched to an advertising
1511 * handle, do not allocate a new one.
1512 */
1513 qos->bcast.bis = conn->iso_qos.bcast.bis;
1514 return 0;
1515 }
1516 }
1517
1518 /* Find an unused adv set to advertise BIS, skip instance 0x00
1519 * since it is reserved as general purpose set.
1520 */
1521 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1522 bis++) {
1523
1524 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1525 if (!conn)
1526 break;
1527 }
1528
1529 if (bis == hdev->le_num_of_adv_sets)
1530 return -EADDRNOTAVAIL;
1531
1532 /* Update BIS */
1533 qos->bcast.bis = bis;
1534 }
1535
1536 return 0;
1537 }
1538
1539 /* This function requires the caller holds hdev->lock */
hci_add_bis(struct hci_dev * hdev,bdaddr_t * dst,__u8 sid,struct bt_iso_qos * qos,__u8 base_len,__u8 * base,u16 timeout)1540 static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1541 __u8 sid, struct bt_iso_qos *qos,
1542 __u8 base_len, __u8 *base, u16 timeout)
1543 {
1544 struct hci_conn *conn;
1545 int err;
1546
1547 /* Let's make sure that le is enabled.*/
1548 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1549 if (lmp_le_capable(hdev))
1550 return ERR_PTR(-ECONNREFUSED);
1551 return ERR_PTR(-EOPNOTSUPP);
1552 }
1553
1554 err = qos_set_big(hdev, qos);
1555 if (err)
1556 return ERR_PTR(err);
1557
1558 err = qos_set_bis(hdev, qos);
1559 if (err)
1560 return ERR_PTR(err);
1561
1562 /* Check if the LE Create BIG command has already been sent */
1563 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1564 qos->bcast.big);
1565 if (conn)
1566 return ERR_PTR(-EADDRINUSE);
1567
1568 /* Check BIS settings against other bound BISes, since all
1569 * BISes in a BIG must have the same value for all parameters
1570 */
1571 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1572
1573 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1574 base_len != conn->le_per_adv_data_len ||
1575 memcmp(conn->le_per_adv_data, base, base_len)))
1576 return ERR_PTR(-EADDRINUSE);
1577
1578 conn = hci_conn_add_unset(hdev, BIS_LINK, dst, HCI_ROLE_MASTER);
1579 if (IS_ERR(conn))
1580 return conn;
1581
1582 conn->state = BT_CONNECT;
1583 conn->sid = sid;
1584 conn->conn_timeout = timeout;
1585
1586 hci_conn_hold(conn);
1587 return conn;
1588 }
1589
1590 /* 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)1591 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1592 u8 dst_type, u8 sec_level,
1593 u16 conn_timeout,
1594 enum conn_reasons conn_reason)
1595 {
1596 struct hci_conn *conn;
1597
1598 /* Let's make sure that le is enabled.*/
1599 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1600 if (lmp_le_capable(hdev))
1601 return ERR_PTR(-ECONNREFUSED);
1602
1603 return ERR_PTR(-EOPNOTSUPP);
1604 }
1605
1606 /* Some devices send ATT messages as soon as the physical link is
1607 * established. To be able to handle these ATT messages, the user-
1608 * space first establishes the connection and then starts the pairing
1609 * process.
1610 *
1611 * So if a hci_conn object already exists for the following connection
1612 * attempt, we simply update pending_sec_level and auth_type fields
1613 * and return the object found.
1614 */
1615 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1616 if (conn) {
1617 if (conn->pending_sec_level < sec_level)
1618 conn->pending_sec_level = sec_level;
1619 goto done;
1620 }
1621
1622 BT_DBG("requesting refresh of dst_addr");
1623
1624 conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1625 if (IS_ERR(conn))
1626 return conn;
1627
1628 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1629 hci_conn_del(conn);
1630 return ERR_PTR(-EBUSY);
1631 }
1632
1633 conn->state = BT_CONNECT;
1634 set_bit(HCI_CONN_SCANNING, &conn->flags);
1635 conn->dst_type = dst_type;
1636 conn->sec_level = BT_SECURITY_LOW;
1637 conn->pending_sec_level = sec_level;
1638 conn->conn_timeout = conn_timeout;
1639 conn->conn_reason = conn_reason;
1640
1641 hci_update_passive_scan(hdev);
1642
1643 done:
1644 hci_conn_hold(conn);
1645 return conn;
1646 }
1647
hci_connect_acl(struct hci_dev * hdev,bdaddr_t * dst,u8 sec_level,u8 auth_type,enum conn_reasons conn_reason,u16 timeout)1648 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1649 u8 sec_level, u8 auth_type,
1650 enum conn_reasons conn_reason, u16 timeout)
1651 {
1652 struct hci_conn *acl;
1653
1654 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1655 if (lmp_bredr_capable(hdev))
1656 return ERR_PTR(-ECONNREFUSED);
1657
1658 return ERR_PTR(-EOPNOTSUPP);
1659 }
1660
1661 /* Reject outgoing connection to device with same BD ADDR against
1662 * CVE-2020-26555
1663 */
1664 if (!bacmp(&hdev->bdaddr, dst)) {
1665 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1666 dst);
1667 return ERR_PTR(-ECONNREFUSED);
1668 }
1669
1670 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1671 if (!acl) {
1672 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1673 if (IS_ERR(acl))
1674 return acl;
1675 }
1676
1677 hci_conn_hold(acl);
1678
1679 acl->conn_reason = conn_reason;
1680 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1681 int err;
1682
1683 acl->sec_level = BT_SECURITY_LOW;
1684 acl->pending_sec_level = sec_level;
1685 acl->auth_type = auth_type;
1686 acl->conn_timeout = timeout;
1687
1688 err = hci_connect_acl_sync(hdev, acl);
1689 if (err) {
1690 hci_conn_del(acl);
1691 return ERR_PTR(err);
1692 }
1693 }
1694
1695 return acl;
1696 }
1697
hci_conn_link(struct hci_conn * parent,struct hci_conn * conn)1698 static struct hci_link *hci_conn_link(struct hci_conn *parent,
1699 struct hci_conn *conn)
1700 {
1701 struct hci_dev *hdev = parent->hdev;
1702 struct hci_link *link;
1703
1704 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1705
1706 if (conn->link)
1707 return conn->link;
1708
1709 if (conn->parent)
1710 return NULL;
1711
1712 link = kzalloc(sizeof(*link), GFP_KERNEL);
1713 if (!link)
1714 return NULL;
1715
1716 link->conn = hci_conn_hold(conn);
1717 conn->link = link;
1718 conn->parent = hci_conn_get(parent);
1719
1720 /* Use list_add_tail_rcu append to the list */
1721 list_add_tail_rcu(&link->list, &parent->link_list);
1722
1723 return link;
1724 }
1725
hci_connect_sco(struct hci_dev * hdev,int type,bdaddr_t * dst,__u16 setting,struct bt_codec * codec,u16 timeout)1726 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1727 __u16 setting, struct bt_codec *codec,
1728 u16 timeout)
1729 {
1730 struct hci_conn *acl;
1731 struct hci_conn *sco;
1732 struct hci_link *link;
1733
1734 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1735 CONN_REASON_SCO_CONNECT, timeout);
1736 if (IS_ERR(acl))
1737 return acl;
1738
1739 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1740 if (!sco) {
1741 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1742 if (IS_ERR(sco)) {
1743 hci_conn_drop(acl);
1744 return sco;
1745 }
1746 }
1747
1748 link = hci_conn_link(acl, sco);
1749 if (!link) {
1750 hci_conn_drop(acl);
1751 hci_conn_drop(sco);
1752 return ERR_PTR(-ENOLINK);
1753 }
1754
1755 sco->setting = setting;
1756 sco->codec = *codec;
1757
1758 if (acl->state == BT_CONNECTED &&
1759 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1760 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1761 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1762
1763 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1764 /* defer SCO setup until mode change completed */
1765 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1766 return sco;
1767 }
1768
1769 hci_sco_setup(acl, 0x00);
1770 }
1771
1772 return sco;
1773 }
1774
hci_le_create_big(struct hci_conn * conn,struct bt_iso_qos * qos)1775 static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1776 {
1777 struct hci_dev *hdev = conn->hdev;
1778 struct hci_cp_le_create_big cp;
1779 struct iso_list_data data;
1780
1781 memset(&cp, 0, sizeof(cp));
1782
1783 data.big = qos->bcast.big;
1784 data.bis = qos->bcast.bis;
1785 data.count = 0;
1786
1787 /* Create a BIS for each bound connection */
1788 hci_conn_hash_list_state(hdev, bis_list, BIS_LINK,
1789 BT_BOUND, &data);
1790
1791 cp.handle = qos->bcast.big;
1792 cp.adv_handle = qos->bcast.bis;
1793 cp.num_bis = data.count;
1794 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1795 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1796 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1797 cp.bis.rtn = qos->bcast.out.rtn;
1798 cp.bis.phy = qos->bcast.out.phy;
1799 cp.bis.packing = qos->bcast.packing;
1800 cp.bis.framing = qos->bcast.framing;
1801 cp.bis.encryption = qos->bcast.encryption;
1802 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1803
1804 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1805 }
1806
set_cig_params_sync(struct hci_dev * hdev,void * data)1807 static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1808 {
1809 DEFINE_FLEX(struct hci_cp_le_set_cig_params, pdu, cis, num_cis, 0x1f);
1810 u8 cig_id = PTR_UINT(data);
1811 struct hci_conn *conn;
1812 struct bt_iso_qos *qos;
1813 u8 aux_num_cis = 0;
1814 u8 cis_id;
1815
1816 conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1817 if (!conn)
1818 return 0;
1819
1820 qos = &conn->iso_qos;
1821 pdu->cig_id = cig_id;
1822 hci_cpu_to_le24(qos->ucast.out.interval, pdu->c_interval);
1823 hci_cpu_to_le24(qos->ucast.in.interval, pdu->p_interval);
1824 pdu->sca = qos->ucast.sca;
1825 pdu->packing = qos->ucast.packing;
1826 pdu->framing = qos->ucast.framing;
1827 pdu->c_latency = cpu_to_le16(qos->ucast.out.latency);
1828 pdu->p_latency = cpu_to_le16(qos->ucast.in.latency);
1829
1830 /* Reprogram all CIS(s) with the same CIG, valid range are:
1831 * num_cis: 0x00 to 0x1F
1832 * cis_id: 0x00 to 0xEF
1833 */
1834 for (cis_id = 0x00; cis_id < 0xf0 &&
1835 aux_num_cis < pdu->num_cis; cis_id++) {
1836 struct hci_cis_params *cis;
1837
1838 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1839 if (!conn)
1840 continue;
1841
1842 qos = &conn->iso_qos;
1843
1844 cis = &pdu->cis[aux_num_cis++];
1845 cis->cis_id = cis_id;
1846 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1847 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1848 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
1849 qos->ucast.in.phy;
1850 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
1851 qos->ucast.out.phy;
1852 cis->c_rtn = qos->ucast.out.rtn;
1853 cis->p_rtn = qos->ucast.in.rtn;
1854 }
1855 pdu->num_cis = aux_num_cis;
1856
1857 if (!pdu->num_cis)
1858 return 0;
1859
1860 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1861 struct_size(pdu, cis, pdu->num_cis),
1862 pdu, HCI_CMD_TIMEOUT);
1863 }
1864
hci_le_set_cig_params(struct hci_conn * conn,struct bt_iso_qos * qos)1865 static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1866 {
1867 struct hci_dev *hdev = conn->hdev;
1868 struct iso_list_data data;
1869
1870 memset(&data, 0, sizeof(data));
1871
1872 /* Allocate first still reconfigurable CIG if not set */
1873 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1874 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1875 data.count = 0;
1876
1877 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK,
1878 BT_CONNECT, &data);
1879 if (data.count)
1880 continue;
1881
1882 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK,
1883 BT_CONNECTED, &data);
1884 if (!data.count)
1885 break;
1886 }
1887
1888 if (data.cig == 0xf0)
1889 return false;
1890
1891 /* Update CIG */
1892 qos->ucast.cig = data.cig;
1893 }
1894
1895 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1896 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1897 qos->ucast.cis))
1898 return false;
1899 goto done;
1900 }
1901
1902 /* Allocate first available CIS if not set */
1903 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1904 data.cis++) {
1905 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1906 data.cis)) {
1907 /* Update CIS */
1908 qos->ucast.cis = data.cis;
1909 break;
1910 }
1911 }
1912
1913 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1914 return false;
1915
1916 done:
1917 if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1918 UINT_PTR(qos->ucast.cig), NULL) < 0)
1919 return false;
1920
1921 return true;
1922 }
1923
hci_bind_cis(struct hci_dev * hdev,bdaddr_t * dst,__u8 dst_type,struct bt_iso_qos * qos,u16 timeout)1924 struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1925 __u8 dst_type, struct bt_iso_qos *qos,
1926 u16 timeout)
1927 {
1928 struct hci_conn *cis;
1929
1930 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1931 qos->ucast.cis);
1932 if (!cis) {
1933 cis = hci_conn_add_unset(hdev, CIS_LINK, dst,
1934 HCI_ROLE_MASTER);
1935 if (IS_ERR(cis))
1936 return cis;
1937 cis->cleanup = cis_cleanup;
1938 cis->dst_type = dst_type;
1939 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1940 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1941 cis->conn_timeout = timeout;
1942 }
1943
1944 if (cis->state == BT_CONNECTED)
1945 return cis;
1946
1947 /* Check if CIS has been set and the settings matches */
1948 if (cis->state == BT_BOUND &&
1949 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1950 return cis;
1951
1952 /* Update LINK PHYs according to QoS preference */
1953 cis->le_tx_phy = qos->ucast.out.phy;
1954 cis->le_rx_phy = qos->ucast.in.phy;
1955
1956 /* If output interval is not set use the input interval as it cannot be
1957 * 0x000000.
1958 */
1959 if (!qos->ucast.out.interval)
1960 qos->ucast.out.interval = qos->ucast.in.interval;
1961
1962 /* If input interval is not set use the output interval as it cannot be
1963 * 0x000000.
1964 */
1965 if (!qos->ucast.in.interval)
1966 qos->ucast.in.interval = qos->ucast.out.interval;
1967
1968 /* If output latency is not set use the input latency as it cannot be
1969 * 0x0000.
1970 */
1971 if (!qos->ucast.out.latency)
1972 qos->ucast.out.latency = qos->ucast.in.latency;
1973
1974 /* If input latency is not set use the output latency as it cannot be
1975 * 0x0000.
1976 */
1977 if (!qos->ucast.in.latency)
1978 qos->ucast.in.latency = qos->ucast.out.latency;
1979
1980 if (!hci_le_set_cig_params(cis, qos)) {
1981 hci_conn_drop(cis);
1982 return ERR_PTR(-EINVAL);
1983 }
1984
1985 hci_conn_hold(cis);
1986
1987 cis->iso_qos = *qos;
1988 cis->state = BT_BOUND;
1989
1990 return cis;
1991 }
1992
hci_iso_setup_path(struct hci_conn * conn)1993 bool hci_iso_setup_path(struct hci_conn *conn)
1994 {
1995 struct hci_dev *hdev = conn->hdev;
1996 struct hci_cp_le_setup_iso_path cmd;
1997
1998 memset(&cmd, 0, sizeof(cmd));
1999
2000 if (conn->iso_qos.ucast.out.sdu) {
2001 cmd.handle = cpu_to_le16(conn->handle);
2002 cmd.direction = 0x00; /* Input (Host to Controller) */
2003 cmd.path = 0x00; /* HCI path if enabled */
2004 cmd.codec = 0x03; /* Transparent Data */
2005
2006 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2007 &cmd) < 0)
2008 return false;
2009 }
2010
2011 if (conn->iso_qos.ucast.in.sdu) {
2012 cmd.handle = cpu_to_le16(conn->handle);
2013 cmd.direction = 0x01; /* Output (Controller to Host) */
2014 cmd.path = 0x00; /* HCI path if enabled */
2015 cmd.codec = 0x03; /* Transparent Data */
2016
2017 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2018 &cmd) < 0)
2019 return false;
2020 }
2021
2022 return true;
2023 }
2024
hci_conn_check_create_cis(struct hci_conn * conn)2025 int hci_conn_check_create_cis(struct hci_conn *conn)
2026 {
2027 if (conn->type != CIS_LINK)
2028 return -EINVAL;
2029
2030 if (!conn->parent || conn->parent->state != BT_CONNECTED ||
2031 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
2032 return 1;
2033
2034 return 0;
2035 }
2036
hci_create_cis_sync(struct hci_dev * hdev,void * data)2037 static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
2038 {
2039 return hci_le_create_cis_sync(hdev);
2040 }
2041
hci_le_create_cis_pending(struct hci_dev * hdev)2042 int hci_le_create_cis_pending(struct hci_dev *hdev)
2043 {
2044 struct hci_conn *conn;
2045 bool pending = false;
2046
2047 rcu_read_lock();
2048
2049 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2050 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2051 rcu_read_unlock();
2052 return -EBUSY;
2053 }
2054
2055 if (!hci_conn_check_create_cis(conn))
2056 pending = true;
2057 }
2058
2059 rcu_read_unlock();
2060
2061 if (!pending)
2062 return 0;
2063
2064 /* Queue Create CIS */
2065 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2066 }
2067
hci_iso_qos_setup(struct hci_dev * hdev,struct hci_conn * conn,struct bt_iso_io_qos * qos,__u8 phy)2068 static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2069 struct bt_iso_io_qos *qos, __u8 phy)
2070 {
2071 /* Only set MTU if PHY is enabled */
2072 if (!qos->sdu && qos->phy)
2073 qos->sdu = conn->mtu;
2074
2075 /* Use the same PHY as ACL if set to any */
2076 if (qos->phy == BT_ISO_PHY_ANY)
2077 qos->phy = phy;
2078
2079 /* Use LE ACL connection interval if not set */
2080 if (!qos->interval)
2081 /* ACL interval unit in 1.25 ms to us */
2082 qos->interval = conn->le_conn_interval * 1250;
2083
2084 /* Use LE ACL connection latency if not set */
2085 if (!qos->latency)
2086 qos->latency = conn->le_conn_latency;
2087 }
2088
create_big_sync(struct hci_dev * hdev,void * data)2089 static int create_big_sync(struct hci_dev *hdev, void *data)
2090 {
2091 struct hci_conn *conn = data;
2092 struct bt_iso_qos *qos = &conn->iso_qos;
2093 u16 interval, sync_interval = 0;
2094 u32 flags = 0;
2095 int err;
2096
2097 if (qos->bcast.out.phy == 0x02)
2098 flags |= MGMT_ADV_FLAG_SEC_2M;
2099
2100 /* Align intervals */
2101 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2102
2103 if (qos->bcast.bis)
2104 sync_interval = interval * 4;
2105
2106 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->sid,
2107 conn->le_per_adv_data_len,
2108 conn->le_per_adv_data, flags, interval,
2109 interval, sync_interval);
2110 if (err)
2111 return err;
2112
2113 return hci_le_create_big(conn, &conn->iso_qos);
2114 }
2115
hci_pa_create_sync(struct hci_dev * hdev,bdaddr_t * dst,__u8 dst_type,__u8 sid,struct bt_iso_qos * qos)2116 struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst,
2117 __u8 dst_type, __u8 sid,
2118 struct bt_iso_qos *qos)
2119 {
2120 struct hci_conn *conn;
2121
2122 bt_dev_dbg(hdev, "dst %pMR type %d sid %d", dst, dst_type, sid);
2123
2124 conn = hci_conn_add_unset(hdev, PA_LINK, dst, HCI_ROLE_SLAVE);
2125 if (IS_ERR(conn))
2126 return conn;
2127
2128 conn->iso_qos = *qos;
2129 conn->dst_type = dst_type;
2130 conn->sid = sid;
2131 conn->state = BT_LISTEN;
2132 conn->conn_timeout = msecs_to_jiffies(qos->bcast.sync_timeout * 10);
2133
2134 hci_conn_hold(conn);
2135
2136 hci_connect_pa_sync(hdev, conn);
2137
2138 return conn;
2139 }
2140
hci_conn_big_create_sync(struct hci_dev * hdev,struct hci_conn * hcon,struct bt_iso_qos * qos,__u16 sync_handle,__u8 num_bis,__u8 bis[])2141 int hci_conn_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2142 struct bt_iso_qos *qos, __u16 sync_handle,
2143 __u8 num_bis, __u8 bis[])
2144 {
2145 int err;
2146
2147 if (num_bis < 0x01 || num_bis > ISO_MAX_NUM_BIS)
2148 return -EINVAL;
2149
2150 err = qos_set_big(hdev, qos);
2151 if (err)
2152 return err;
2153
2154 if (hcon) {
2155 /* Update hcon QoS */
2156 hcon->iso_qos = *qos;
2157
2158 hcon->num_bis = num_bis;
2159 memcpy(hcon->bis, bis, num_bis);
2160 hcon->conn_timeout = msecs_to_jiffies(qos->bcast.timeout * 10);
2161 }
2162
2163 return hci_connect_big_sync(hdev, hcon);
2164 }
2165
create_big_complete(struct hci_dev * hdev,void * data,int err)2166 static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2167 {
2168 struct hci_conn *conn = data;
2169
2170 bt_dev_dbg(hdev, "conn %p", conn);
2171
2172 if (err) {
2173 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2174 hci_connect_cfm(conn, err);
2175 hci_conn_del(conn);
2176 }
2177 }
2178
hci_bind_bis(struct hci_dev * hdev,bdaddr_t * dst,__u8 sid,struct bt_iso_qos * qos,__u8 base_len,__u8 * base,u16 timeout)2179 struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst, __u8 sid,
2180 struct bt_iso_qos *qos,
2181 __u8 base_len, __u8 *base, u16 timeout)
2182 {
2183 struct hci_conn *conn;
2184 struct hci_conn *parent;
2185 __u8 eir[HCI_MAX_PER_AD_LENGTH];
2186 struct hci_link *link;
2187
2188 /* Look for any BIS that is open for rebinding */
2189 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN,
2190 HCI_ROLE_MASTER);
2191 if (conn) {
2192 memcpy(qos, &conn->iso_qos, sizeof(*qos));
2193 conn->state = BT_CONNECTED;
2194 return conn;
2195 }
2196
2197 if (base_len && base)
2198 base_len = eir_append_service_data(eir, 0, 0x1851,
2199 base, base_len);
2200
2201 /* We need hci_conn object using the BDADDR_ANY as dst */
2202 conn = hci_add_bis(hdev, dst, sid, qos, base_len, eir, timeout);
2203 if (IS_ERR(conn))
2204 return conn;
2205
2206 /* Update LINK PHYs according to QoS preference */
2207 conn->le_tx_phy = qos->bcast.out.phy;
2208 conn->le_tx_phy = qos->bcast.out.phy;
2209
2210 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2211 if (base_len && base) {
2212 memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2213 conn->le_per_adv_data_len = base_len;
2214 }
2215
2216 hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2217 conn->le_tx_phy ? conn->le_tx_phy :
2218 hdev->le_tx_def_phys);
2219
2220 conn->iso_qos = *qos;
2221 conn->state = BT_BOUND;
2222
2223 /* Link BISes together */
2224 parent = hci_conn_hash_lookup_big(hdev,
2225 conn->iso_qos.bcast.big);
2226 if (parent && parent != conn) {
2227 link = hci_conn_link(parent, conn);
2228 hci_conn_drop(conn);
2229 if (!link)
2230 return ERR_PTR(-ENOLINK);
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,__u8 sid,struct bt_iso_qos * qos,__u8 base_len,__u8 * base,u16 timeout)2252 struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2253 __u8 dst_type, __u8 sid,
2254 struct bt_iso_qos *qos,
2255 __u8 base_len, __u8 *base, u16 timeout)
2256 {
2257 struct hci_conn *conn;
2258 int err;
2259 struct iso_list_data data;
2260
2261 conn = hci_bind_bis(hdev, dst, sid, qos, base_len, base, timeout);
2262 if (IS_ERR(conn))
2263 return conn;
2264
2265 if (conn->state == BT_CONNECTED)
2266 return conn;
2267
2268 /* Check if SID needs to be allocated then search for the first
2269 * available.
2270 */
2271 if (conn->sid == HCI_SID_INVALID) {
2272 u8 sid;
2273
2274 for (sid = 0; sid <= 0x0f; sid++) {
2275 if (!hci_find_adv_sid(hdev, sid)) {
2276 conn->sid = sid;
2277 break;
2278 }
2279 }
2280 }
2281
2282 data.big = qos->bcast.big;
2283 data.bis = qos->bcast.bis;
2284
2285 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2286 * the start periodic advertising and create BIG commands have
2287 * been queued
2288 */
2289 hci_conn_hash_list_state(hdev, bis_mark_per_adv, BIS_LINK,
2290 BT_BOUND, &data);
2291
2292 /* Queue start periodic advertising and create BIG */
2293 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2294 create_big_complete);
2295 if (err < 0) {
2296 hci_conn_drop(conn);
2297 return ERR_PTR(err);
2298 }
2299
2300 return conn;
2301 }
2302
hci_connect_cis(struct hci_dev * hdev,bdaddr_t * dst,__u8 dst_type,struct bt_iso_qos * qos,u16 timeout)2303 struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2304 __u8 dst_type, struct bt_iso_qos *qos,
2305 u16 timeout)
2306 {
2307 struct hci_conn *le;
2308 struct hci_conn *cis;
2309 struct hci_link *link;
2310
2311 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2312 le = hci_connect_le(hdev, dst, dst_type, false,
2313 BT_SECURITY_LOW,
2314 HCI_LE_CONN_TIMEOUT,
2315 HCI_ROLE_SLAVE, 0, 0);
2316 else
2317 le = hci_connect_le_scan(hdev, dst, dst_type,
2318 BT_SECURITY_LOW,
2319 HCI_LE_CONN_TIMEOUT,
2320 CONN_REASON_ISO_CONNECT);
2321 if (IS_ERR(le))
2322 return le;
2323
2324 hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2325 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2326 hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2327 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2328
2329 cis = hci_bind_cis(hdev, dst, dst_type, qos, timeout);
2330 if (IS_ERR(cis)) {
2331 hci_conn_drop(le);
2332 return cis;
2333 }
2334
2335 link = hci_conn_link(le, cis);
2336 hci_conn_drop(cis);
2337 if (!link) {
2338 hci_conn_drop(le);
2339 return ERR_PTR(-ENOLINK);
2340 }
2341
2342 cis->state = BT_CONNECT;
2343
2344 hci_le_create_cis_pending(hdev);
2345
2346 return cis;
2347 }
2348
2349 /* Check link security requirement */
hci_conn_check_link_mode(struct hci_conn * conn)2350 int hci_conn_check_link_mode(struct hci_conn *conn)
2351 {
2352 BT_DBG("hcon %p", conn);
2353
2354 /* In Secure Connections Only mode, it is required that Secure
2355 * Connections is used and the link is encrypted with AES-CCM
2356 * using a P-256 authenticated combination key.
2357 */
2358 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2359 if (!hci_conn_sc_enabled(conn) ||
2360 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2361 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2362 return 0;
2363 }
2364
2365 /* AES encryption is required for Level 4:
2366 *
2367 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2368 * page 1319:
2369 *
2370 * 128-bit equivalent strength for link and encryption keys
2371 * required using FIPS approved algorithms (E0 not allowed,
2372 * SAFER+ not allowed, and P-192 not allowed; encryption key
2373 * not shortened)
2374 */
2375 if (conn->sec_level == BT_SECURITY_FIPS &&
2376 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2377 bt_dev_err(conn->hdev,
2378 "Invalid security: Missing AES-CCM usage");
2379 return 0;
2380 }
2381
2382 if (hci_conn_ssp_enabled(conn) &&
2383 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2384 return 0;
2385
2386 return 1;
2387 }
2388
2389 /* Authenticate remote device */
hci_conn_auth(struct hci_conn * conn,__u8 sec_level,__u8 auth_type)2390 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2391 {
2392 BT_DBG("hcon %p", conn);
2393
2394 if (conn->pending_sec_level > sec_level)
2395 sec_level = conn->pending_sec_level;
2396
2397 if (sec_level > conn->sec_level)
2398 conn->pending_sec_level = sec_level;
2399 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2400 return 1;
2401
2402 /* Make sure we preserve an existing MITM requirement*/
2403 auth_type |= (conn->auth_type & 0x01);
2404
2405 conn->auth_type = auth_type;
2406
2407 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2408 struct hci_cp_auth_requested cp;
2409
2410 cp.handle = cpu_to_le16(conn->handle);
2411 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2412 sizeof(cp), &cp);
2413
2414 /* Set the ENCRYPT_PEND to trigger encryption after
2415 * authentication.
2416 */
2417 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2418 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2419 }
2420
2421 return 0;
2422 }
2423
2424 /* Encrypt the link */
hci_conn_encrypt(struct hci_conn * conn)2425 static void hci_conn_encrypt(struct hci_conn *conn)
2426 {
2427 BT_DBG("hcon %p", conn);
2428
2429 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2430 struct hci_cp_set_conn_encrypt cp;
2431 cp.handle = cpu_to_le16(conn->handle);
2432 cp.encrypt = 0x01;
2433 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2434 &cp);
2435 }
2436 }
2437
2438 /* Enable security */
hci_conn_security(struct hci_conn * conn,__u8 sec_level,__u8 auth_type,bool initiator)2439 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2440 bool initiator)
2441 {
2442 BT_DBG("hcon %p", conn);
2443
2444 if (conn->type == LE_LINK)
2445 return smp_conn_security(conn, sec_level);
2446
2447 /* For sdp we don't need the link key. */
2448 if (sec_level == BT_SECURITY_SDP)
2449 return 1;
2450
2451 /* For non 2.1 devices and low security level we don't need the link
2452 key. */
2453 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2454 return 1;
2455
2456 /* For other security levels we need the link key. */
2457 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2458 goto auth;
2459
2460 switch (conn->key_type) {
2461 case HCI_LK_AUTH_COMBINATION_P256:
2462 /* An authenticated FIPS approved combination key has
2463 * sufficient security for security level 4 or lower.
2464 */
2465 if (sec_level <= BT_SECURITY_FIPS)
2466 goto encrypt;
2467 break;
2468 case HCI_LK_AUTH_COMBINATION_P192:
2469 /* An authenticated combination key has sufficient security for
2470 * security level 3 or lower.
2471 */
2472 if (sec_level <= BT_SECURITY_HIGH)
2473 goto encrypt;
2474 break;
2475 case HCI_LK_UNAUTH_COMBINATION_P192:
2476 case HCI_LK_UNAUTH_COMBINATION_P256:
2477 /* An unauthenticated combination key has sufficient security
2478 * for security level 2 or lower.
2479 */
2480 if (sec_level <= BT_SECURITY_MEDIUM)
2481 goto encrypt;
2482 break;
2483 case HCI_LK_COMBINATION:
2484 /* A combination key has always sufficient security for the
2485 * security levels 2 or lower. High security level requires the
2486 * combination key is generated using maximum PIN code length
2487 * (16). For pre 2.1 units.
2488 */
2489 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2490 goto encrypt;
2491 break;
2492 default:
2493 break;
2494 }
2495
2496 auth:
2497 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2498 return 0;
2499
2500 if (initiator)
2501 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2502
2503 if (!hci_conn_auth(conn, sec_level, auth_type))
2504 return 0;
2505
2506 encrypt:
2507 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2508 /* Ensure that the encryption key size has been read,
2509 * otherwise stall the upper layer responses.
2510 */
2511 if (!conn->enc_key_size)
2512 return 0;
2513
2514 /* Nothing else needed, all requirements are met */
2515 return 1;
2516 }
2517
2518 hci_conn_encrypt(conn);
2519 return 0;
2520 }
2521 EXPORT_SYMBOL(hci_conn_security);
2522
2523 /* Check secure link requirement */
hci_conn_check_secure(struct hci_conn * conn,__u8 sec_level)2524 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2525 {
2526 BT_DBG("hcon %p", conn);
2527
2528 /* Accept if non-secure or higher security level is required */
2529 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2530 return 1;
2531
2532 /* Accept if secure or higher security level is already present */
2533 if (conn->sec_level == BT_SECURITY_HIGH ||
2534 conn->sec_level == BT_SECURITY_FIPS)
2535 return 1;
2536
2537 /* Reject not secure link */
2538 return 0;
2539 }
2540 EXPORT_SYMBOL(hci_conn_check_secure);
2541
2542 /* Switch role */
hci_conn_switch_role(struct hci_conn * conn,__u8 role)2543 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2544 {
2545 BT_DBG("hcon %p", conn);
2546
2547 if (role == conn->role)
2548 return 1;
2549
2550 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2551 struct hci_cp_switch_role cp;
2552 bacpy(&cp.bdaddr, &conn->dst);
2553 cp.role = role;
2554 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2555 }
2556
2557 return 0;
2558 }
2559 EXPORT_SYMBOL(hci_conn_switch_role);
2560
2561 /* Enter active mode */
hci_conn_enter_active_mode(struct hci_conn * conn,__u8 force_active)2562 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2563 {
2564 struct hci_dev *hdev = conn->hdev;
2565
2566 BT_DBG("hcon %p mode %d", conn, conn->mode);
2567
2568 if (conn->mode != HCI_CM_SNIFF)
2569 goto timer;
2570
2571 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2572 goto timer;
2573
2574 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2575 struct hci_cp_exit_sniff_mode cp;
2576 cp.handle = cpu_to_le16(conn->handle);
2577 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2578 }
2579
2580 timer:
2581 if (hdev->idle_timeout > 0)
2582 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2583 msecs_to_jiffies(hdev->idle_timeout));
2584 }
2585
2586 /* Drop all connection on the device */
hci_conn_hash_flush(struct hci_dev * hdev)2587 void hci_conn_hash_flush(struct hci_dev *hdev)
2588 {
2589 struct list_head *head = &hdev->conn_hash.list;
2590 struct hci_conn *conn;
2591
2592 BT_DBG("hdev %s", hdev->name);
2593
2594 /* We should not traverse the list here, because hci_conn_del
2595 * can remove extra links, which may cause the list traversal
2596 * to hit items that have already been released.
2597 */
2598 while ((conn = list_first_entry_or_null(head,
2599 struct hci_conn,
2600 list)) != NULL) {
2601 conn->state = BT_CLOSED;
2602 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2603 hci_conn_del(conn);
2604 }
2605 }
2606
get_link_mode(struct hci_conn * conn)2607 static u32 get_link_mode(struct hci_conn *conn)
2608 {
2609 u32 link_mode = 0;
2610
2611 if (conn->role == HCI_ROLE_MASTER)
2612 link_mode |= HCI_LM_MASTER;
2613
2614 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2615 link_mode |= HCI_LM_ENCRYPT;
2616
2617 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2618 link_mode |= HCI_LM_AUTH;
2619
2620 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2621 link_mode |= HCI_LM_SECURE;
2622
2623 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2624 link_mode |= HCI_LM_FIPS;
2625
2626 return link_mode;
2627 }
2628
hci_get_conn_list(void __user * arg)2629 int hci_get_conn_list(void __user *arg)
2630 {
2631 struct hci_conn *c;
2632 struct hci_conn_list_req req, *cl;
2633 struct hci_conn_info *ci;
2634 struct hci_dev *hdev;
2635 int n = 0, size, err;
2636
2637 if (copy_from_user(&req, arg, sizeof(req)))
2638 return -EFAULT;
2639
2640 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2641 return -EINVAL;
2642
2643 size = sizeof(req) + req.conn_num * sizeof(*ci);
2644
2645 cl = kmalloc(size, GFP_KERNEL);
2646 if (!cl)
2647 return -ENOMEM;
2648
2649 hdev = hci_dev_get(req.dev_id);
2650 if (!hdev) {
2651 kfree(cl);
2652 return -ENODEV;
2653 }
2654
2655 ci = cl->conn_info;
2656
2657 hci_dev_lock(hdev);
2658 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2659 bacpy(&(ci + n)->bdaddr, &c->dst);
2660 (ci + n)->handle = c->handle;
2661 (ci + n)->type = c->type;
2662 (ci + n)->out = c->out;
2663 (ci + n)->state = c->state;
2664 (ci + n)->link_mode = get_link_mode(c);
2665 if (++n >= req.conn_num)
2666 break;
2667 }
2668 hci_dev_unlock(hdev);
2669
2670 cl->dev_id = hdev->id;
2671 cl->conn_num = n;
2672 size = sizeof(req) + n * sizeof(*ci);
2673
2674 hci_dev_put(hdev);
2675
2676 err = copy_to_user(arg, cl, size);
2677 kfree(cl);
2678
2679 return err ? -EFAULT : 0;
2680 }
2681
hci_get_conn_info(struct hci_dev * hdev,void __user * arg)2682 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2683 {
2684 struct hci_conn_info_req req;
2685 struct hci_conn_info ci;
2686 struct hci_conn *conn;
2687 char __user *ptr = arg + sizeof(req);
2688
2689 if (copy_from_user(&req, arg, sizeof(req)))
2690 return -EFAULT;
2691
2692 hci_dev_lock(hdev);
2693 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2694 if (conn) {
2695 bacpy(&ci.bdaddr, &conn->dst);
2696 ci.handle = conn->handle;
2697 ci.type = conn->type;
2698 ci.out = conn->out;
2699 ci.state = conn->state;
2700 ci.link_mode = get_link_mode(conn);
2701 }
2702 hci_dev_unlock(hdev);
2703
2704 if (!conn)
2705 return -ENOENT;
2706
2707 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2708 }
2709
hci_get_auth_info(struct hci_dev * hdev,void __user * arg)2710 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2711 {
2712 struct hci_auth_info_req req;
2713 struct hci_conn *conn;
2714
2715 if (copy_from_user(&req, arg, sizeof(req)))
2716 return -EFAULT;
2717
2718 hci_dev_lock(hdev);
2719 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2720 if (conn)
2721 req.type = conn->auth_type;
2722 hci_dev_unlock(hdev);
2723
2724 if (!conn)
2725 return -ENOENT;
2726
2727 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2728 }
2729
hci_chan_create(struct hci_conn * conn)2730 struct hci_chan *hci_chan_create(struct hci_conn *conn)
2731 {
2732 struct hci_dev *hdev = conn->hdev;
2733 struct hci_chan *chan;
2734
2735 BT_DBG("%s hcon %p", hdev->name, conn);
2736
2737 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2738 BT_DBG("Refusing to create new hci_chan");
2739 return NULL;
2740 }
2741
2742 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2743 if (!chan)
2744 return NULL;
2745
2746 chan->conn = hci_conn_get(conn);
2747 skb_queue_head_init(&chan->data_q);
2748 chan->state = BT_CONNECTED;
2749
2750 list_add_rcu(&chan->list, &conn->chan_list);
2751
2752 return chan;
2753 }
2754
hci_chan_del(struct hci_chan * chan)2755 void hci_chan_del(struct hci_chan *chan)
2756 {
2757 struct hci_conn *conn = chan->conn;
2758 struct hci_dev *hdev = conn->hdev;
2759
2760 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2761
2762 list_del_rcu(&chan->list);
2763
2764 synchronize_rcu();
2765
2766 /* Prevent new hci_chan's to be created for this hci_conn */
2767 set_bit(HCI_CONN_DROP, &conn->flags);
2768
2769 hci_conn_put(conn);
2770
2771 skb_queue_purge(&chan->data_q);
2772 kfree(chan);
2773 }
2774
hci_chan_list_flush(struct hci_conn * conn)2775 void hci_chan_list_flush(struct hci_conn *conn)
2776 {
2777 struct hci_chan *chan, *n;
2778
2779 BT_DBG("hcon %p", conn);
2780
2781 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2782 hci_chan_del(chan);
2783 }
2784
__hci_chan_lookup_handle(struct hci_conn * hcon,__u16 handle)2785 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2786 __u16 handle)
2787 {
2788 struct hci_chan *hchan;
2789
2790 list_for_each_entry(hchan, &hcon->chan_list, list) {
2791 if (hchan->handle == handle)
2792 return hchan;
2793 }
2794
2795 return NULL;
2796 }
2797
hci_chan_lookup_handle(struct hci_dev * hdev,__u16 handle)2798 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2799 {
2800 struct hci_conn_hash *h = &hdev->conn_hash;
2801 struct hci_conn *hcon;
2802 struct hci_chan *hchan = NULL;
2803
2804 rcu_read_lock();
2805
2806 list_for_each_entry_rcu(hcon, &h->list, list) {
2807 hchan = __hci_chan_lookup_handle(hcon, handle);
2808 if (hchan)
2809 break;
2810 }
2811
2812 rcu_read_unlock();
2813
2814 return hchan;
2815 }
2816
hci_conn_get_phy(struct hci_conn * conn)2817 u32 hci_conn_get_phy(struct hci_conn *conn)
2818 {
2819 u32 phys = 0;
2820
2821 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2822 * Table 6.2: Packets defined for synchronous, asynchronous, and
2823 * CPB logical transport types.
2824 */
2825 switch (conn->type) {
2826 case SCO_LINK:
2827 /* SCO logical transport (1 Mb/s):
2828 * HV1, HV2, HV3 and DV.
2829 */
2830 phys |= BT_PHY_BR_1M_1SLOT;
2831
2832 break;
2833
2834 case ACL_LINK:
2835 /* ACL logical transport (1 Mb/s) ptt=0:
2836 * DH1, DM3, DH3, DM5 and DH5.
2837 */
2838 phys |= BT_PHY_BR_1M_1SLOT;
2839
2840 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2841 phys |= BT_PHY_BR_1M_3SLOT;
2842
2843 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2844 phys |= BT_PHY_BR_1M_5SLOT;
2845
2846 /* ACL logical transport (2 Mb/s) ptt=1:
2847 * 2-DH1, 2-DH3 and 2-DH5.
2848 */
2849 if (!(conn->pkt_type & HCI_2DH1))
2850 phys |= BT_PHY_EDR_2M_1SLOT;
2851
2852 if (!(conn->pkt_type & HCI_2DH3))
2853 phys |= BT_PHY_EDR_2M_3SLOT;
2854
2855 if (!(conn->pkt_type & HCI_2DH5))
2856 phys |= BT_PHY_EDR_2M_5SLOT;
2857
2858 /* ACL logical transport (3 Mb/s) ptt=1:
2859 * 3-DH1, 3-DH3 and 3-DH5.
2860 */
2861 if (!(conn->pkt_type & HCI_3DH1))
2862 phys |= BT_PHY_EDR_3M_1SLOT;
2863
2864 if (!(conn->pkt_type & HCI_3DH3))
2865 phys |= BT_PHY_EDR_3M_3SLOT;
2866
2867 if (!(conn->pkt_type & HCI_3DH5))
2868 phys |= BT_PHY_EDR_3M_5SLOT;
2869
2870 break;
2871
2872 case ESCO_LINK:
2873 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2874 phys |= BT_PHY_BR_1M_1SLOT;
2875
2876 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2877 phys |= BT_PHY_BR_1M_3SLOT;
2878
2879 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2880 if (!(conn->pkt_type & ESCO_2EV3))
2881 phys |= BT_PHY_EDR_2M_1SLOT;
2882
2883 if (!(conn->pkt_type & ESCO_2EV5))
2884 phys |= BT_PHY_EDR_2M_3SLOT;
2885
2886 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2887 if (!(conn->pkt_type & ESCO_3EV3))
2888 phys |= BT_PHY_EDR_3M_1SLOT;
2889
2890 if (!(conn->pkt_type & ESCO_3EV5))
2891 phys |= BT_PHY_EDR_3M_3SLOT;
2892
2893 break;
2894
2895 case LE_LINK:
2896 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2897 phys |= BT_PHY_LE_1M_TX;
2898
2899 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2900 phys |= BT_PHY_LE_1M_RX;
2901
2902 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2903 phys |= BT_PHY_LE_2M_TX;
2904
2905 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2906 phys |= BT_PHY_LE_2M_RX;
2907
2908 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2909 phys |= BT_PHY_LE_CODED_TX;
2910
2911 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2912 phys |= BT_PHY_LE_CODED_RX;
2913
2914 break;
2915 }
2916
2917 return phys;
2918 }
2919
abort_conn_sync(struct hci_dev * hdev,void * data)2920 static int abort_conn_sync(struct hci_dev *hdev, void *data)
2921 {
2922 struct hci_conn *conn = data;
2923
2924 if (!hci_conn_valid(hdev, conn))
2925 return -ECANCELED;
2926
2927 return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
2928 }
2929
hci_abort_conn(struct hci_conn * conn,u8 reason)2930 int hci_abort_conn(struct hci_conn *conn, u8 reason)
2931 {
2932 struct hci_dev *hdev = conn->hdev;
2933
2934 /* If abort_reason has already been set it means the connection is
2935 * already being aborted so don't attempt to overwrite it.
2936 */
2937 if (conn->abort_reason)
2938 return 0;
2939
2940 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
2941
2942 conn->abort_reason = reason;
2943
2944 /* If the connection is pending check the command opcode since that
2945 * might be blocking on hci_cmd_sync_work while waiting its respective
2946 * event so we need to hci_cmd_sync_cancel to cancel it.
2947 *
2948 * hci_connect_le serializes the connection attempts so only one
2949 * connection can be in BT_CONNECT at time.
2950 */
2951 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
2952 switch (hci_skb_event(hdev->sent_cmd)) {
2953 case HCI_EV_CONN_COMPLETE:
2954 case HCI_EV_LE_CONN_COMPLETE:
2955 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
2956 case HCI_EVT_LE_CIS_ESTABLISHED:
2957 hci_cmd_sync_cancel(hdev, ECANCELED);
2958 break;
2959 }
2960 /* Cancel connect attempt if still queued/pending */
2961 } else if (!hci_cancel_connect_sync(hdev, conn)) {
2962 return 0;
2963 }
2964
2965 /* Run immediately if on cmd_sync_work since this may be called
2966 * as a result to MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR which does
2967 * already queue its callback on cmd_sync_work.
2968 */
2969 return hci_cmd_sync_run_once(hdev, abort_conn_sync, conn, NULL);
2970 }
2971
hci_setup_tx_timestamp(struct sk_buff * skb,size_t key_offset,const struct sockcm_cookie * sockc)2972 void hci_setup_tx_timestamp(struct sk_buff *skb, size_t key_offset,
2973 const struct sockcm_cookie *sockc)
2974 {
2975 struct sock *sk = skb ? skb->sk : NULL;
2976 int key;
2977
2978 /* This shall be called on a single skb of those generated by user
2979 * sendmsg(), and only when the sendmsg() does not return error to
2980 * user. This is required for keeping the tskey that increments here in
2981 * sync with possible sendmsg() counting by user.
2982 *
2983 * Stream sockets shall set key_offset to sendmsg() length in bytes
2984 * and call with the last fragment, others to 1 and first fragment.
2985 */
2986
2987 if (!skb || !sockc || !sk || !key_offset)
2988 return;
2989
2990 sock_tx_timestamp(sk, sockc, &skb_shinfo(skb)->tx_flags);
2991
2992 if (sk->sk_type == SOCK_STREAM)
2993 key = atomic_add_return(key_offset, &sk->sk_tskey);
2994
2995 if (sockc->tsflags & SOF_TIMESTAMPING_OPT_ID &&
2996 sockc->tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) {
2997 if (sockc->tsflags & SOCKCM_FLAG_TS_OPT_ID) {
2998 skb_shinfo(skb)->tskey = sockc->ts_opt_id;
2999 } else {
3000 if (sk->sk_type != SOCK_STREAM)
3001 key = atomic_inc_return(&sk->sk_tskey);
3002 skb_shinfo(skb)->tskey = key - 1;
3003 }
3004 }
3005 }
3006
hci_conn_tx_queue(struct hci_conn * conn,struct sk_buff * skb)3007 void hci_conn_tx_queue(struct hci_conn *conn, struct sk_buff *skb)
3008 {
3009 struct tx_queue *comp = &conn->tx_q;
3010 bool track = false;
3011
3012 /* Emit SND now, ie. just before sending to driver */
3013 if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP)
3014 __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SND);
3015
3016 /* COMPLETION tstamp is emitted for tracked skb later in Number of
3017 * Completed Packets event. Available only for flow controlled cases.
3018 *
3019 * TODO: SCO support without flowctl (needs to be done in drivers)
3020 */
3021 switch (conn->type) {
3022 case CIS_LINK:
3023 case BIS_LINK:
3024 case PA_LINK:
3025 case ACL_LINK:
3026 case LE_LINK:
3027 break;
3028 case SCO_LINK:
3029 case ESCO_LINK:
3030 if (!hci_dev_test_flag(conn->hdev, HCI_SCO_FLOWCTL))
3031 return;
3032 break;
3033 default:
3034 return;
3035 }
3036
3037 if (skb->sk && (skb_shinfo(skb)->tx_flags & SKBTX_COMPLETION_TSTAMP))
3038 track = true;
3039
3040 /* If nothing is tracked, just count extra skbs at the queue head */
3041 if (!track && !comp->tracked) {
3042 comp->extra++;
3043 return;
3044 }
3045
3046 if (track) {
3047 skb = skb_clone_sk(skb);
3048 if (!skb)
3049 goto count_only;
3050
3051 comp->tracked++;
3052 } else {
3053 skb = skb_clone(skb, GFP_KERNEL);
3054 if (!skb)
3055 goto count_only;
3056 }
3057
3058 skb_queue_tail(&comp->queue, skb);
3059 return;
3060
3061 count_only:
3062 /* Stop tracking skbs, and only count. This will not emit timestamps for
3063 * the packets, but if we get here something is more seriously wrong.
3064 */
3065 comp->tracked = 0;
3066 comp->extra += skb_queue_len(&comp->queue) + 1;
3067 skb_queue_purge(&comp->queue);
3068 }
3069
hci_conn_tx_dequeue(struct hci_conn * conn)3070 void hci_conn_tx_dequeue(struct hci_conn *conn)
3071 {
3072 struct tx_queue *comp = &conn->tx_q;
3073 struct sk_buff *skb;
3074
3075 /* If there are tracked skbs, the counted extra go before dequeuing real
3076 * skbs, to keep ordering. When nothing is tracked, the ordering doesn't
3077 * matter so dequeue real skbs first to get rid of them ASAP.
3078 */
3079 if (comp->extra && (comp->tracked || skb_queue_empty(&comp->queue))) {
3080 comp->extra--;
3081 return;
3082 }
3083
3084 skb = skb_dequeue(&comp->queue);
3085 if (!skb)
3086 return;
3087
3088 if (skb->sk) {
3089 comp->tracked--;
3090 __skb_tstamp_tx(skb, NULL, NULL, skb->sk,
3091 SCM_TSTAMP_COMPLETION);
3092 }
3093
3094 kfree_skb(skb);
3095 }
3096
hci_conn_key_enc_size(struct hci_conn * conn)3097 u8 *hci_conn_key_enc_size(struct hci_conn *conn)
3098 {
3099 if (conn->type == ACL_LINK) {
3100 struct link_key *key;
3101
3102 key = hci_find_link_key(conn->hdev, &conn->dst);
3103 if (!key)
3104 return NULL;
3105
3106 return &key->pin_len;
3107 } else if (conn->type == LE_LINK) {
3108 struct smp_ltk *ltk;
3109
3110 ltk = hci_find_ltk(conn->hdev, &conn->dst, conn->dst_type,
3111 conn->role);
3112 if (!ltk)
3113 return NULL;
3114
3115 return <k->enc_size;
3116 }
3117
3118 return NULL;
3119 }
3120
hci_ethtool_ts_info(unsigned int index,int sk_proto,struct kernel_ethtool_ts_info * info)3121 int hci_ethtool_ts_info(unsigned int index, int sk_proto,
3122 struct kernel_ethtool_ts_info *info)
3123 {
3124 struct hci_dev *hdev;
3125
3126 hdev = hci_dev_get(index);
3127 if (!hdev)
3128 return -ENODEV;
3129
3130 info->so_timestamping =
3131 SOF_TIMESTAMPING_RX_SOFTWARE |
3132 SOF_TIMESTAMPING_SOFTWARE;
3133 info->phc_index = -1;
3134 info->tx_types = BIT(HWTSTAMP_TX_OFF);
3135 info->rx_filters = BIT(HWTSTAMP_FILTER_NONE);
3136
3137 switch (sk_proto) {
3138 case BTPROTO_ISO:
3139 case BTPROTO_L2CAP:
3140 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
3141 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION;
3142 break;
3143 case BTPROTO_SCO:
3144 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
3145 if (hci_dev_test_flag(hdev, HCI_SCO_FLOWCTL))
3146 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION;
3147 break;
3148 }
3149
3150 hci_dev_put(hdev);
3151 return 0;
3152 }
3153