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_obj(*conn_handle);
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_obj(*d);
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,struct hci_conn * conn)772 static int hci_le_big_terminate(struct hci_dev *hdev, struct hci_conn *conn)
773 {
774 struct iso_list_data *d;
775 int ret;
776
777 bt_dev_dbg(hdev, "hcon %p big 0x%2.2x sync_handle 0x%4.4x", conn,
778 conn->iso_qos.bcast.big, conn->sync_handle);
779
780 d = kzalloc_obj(*d);
781 if (!d)
782 return -ENOMEM;
783
784 d->big = conn->iso_qos.bcast.big;
785 d->sync_handle = conn->sync_handle;
786
787 if (conn->type == PA_LINK &&
788 test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
789 hci_conn_hash_list_flag(hdev, find_bis, PA_LINK,
790 HCI_CONN_PA_SYNC, d);
791
792 if (!d->count)
793 d->pa_sync_term = true;
794
795 d->count = 0;
796 }
797
798 if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) {
799 hci_conn_hash_list_flag(hdev, find_bis, BIS_LINK,
800 HCI_CONN_BIG_SYNC, d);
801
802 if (!d->count)
803 d->big_sync_term = true;
804 }
805
806 if (!d->pa_sync_term && !d->big_sync_term)
807 return 0;
808
809 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
810 terminate_big_destroy);
811 if (ret)
812 kfree(d);
813
814 return ret;
815 }
816
817 /* Cleanup BIS connection
818 *
819 * Detects if there any BIS left connected in a BIG
820 * broadcaster: Remove advertising instance and terminate BIG.
821 * broadcaster receiver: Terminate BIG sync and terminate PA sync.
822 */
bis_cleanup(struct hci_conn * conn)823 static void bis_cleanup(struct hci_conn *conn)
824 {
825 struct hci_dev *hdev = conn->hdev;
826 struct hci_conn *bis;
827
828 bt_dev_dbg(hdev, "conn %p", conn);
829
830 if (conn->role == HCI_ROLE_MASTER) {
831 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
832 return;
833
834 /* Check if ISO connection is a BIS and terminate advertising
835 * set and BIG if there are no other connections using it.
836 */
837 bis = hci_conn_hash_lookup_big_state(hdev,
838 conn->iso_qos.bcast.big,
839 BT_CONNECTED,
840 HCI_ROLE_MASTER);
841 if (bis)
842 return;
843
844 bis = hci_conn_hash_lookup_big_state(hdev,
845 conn->iso_qos.bcast.big,
846 BT_CONNECT,
847 HCI_ROLE_MASTER);
848 if (bis)
849 return;
850
851 bis = hci_conn_hash_lookup_big_state(hdev,
852 conn->iso_qos.bcast.big,
853 BT_OPEN,
854 HCI_ROLE_MASTER);
855 if (bis)
856 return;
857
858 hci_le_terminate_big(hdev, conn);
859 } else {
860 hci_le_big_terminate(hdev, conn);
861 }
862 }
863
remove_cig_sync(struct hci_dev * hdev,void * data)864 static int remove_cig_sync(struct hci_dev *hdev, void *data)
865 {
866 u8 handle = PTR_UINT(data);
867
868 return hci_le_remove_cig_sync(hdev, handle);
869 }
870
hci_le_remove_cig(struct hci_dev * hdev,u8 handle)871 static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
872 {
873 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
874
875 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
876 NULL);
877 }
878
find_cis(struct hci_conn * conn,void * data)879 static void find_cis(struct hci_conn *conn, void *data)
880 {
881 struct iso_list_data *d = data;
882
883 /* Ignore broadcast or if CIG don't match */
884 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
885 return;
886
887 d->count++;
888 }
889
890 /* Cleanup CIS connection:
891 *
892 * Detects if there any CIS left connected in a CIG and remove it.
893 */
cis_cleanup(struct hci_conn * conn)894 static void cis_cleanup(struct hci_conn *conn)
895 {
896 struct hci_dev *hdev = conn->hdev;
897 struct iso_list_data d;
898
899 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
900 return;
901
902 memset(&d, 0, sizeof(d));
903 d.cig = conn->iso_qos.ucast.cig;
904
905 /* Check if ISO connection is a CIS and remove CIG if there are
906 * no other connections using it.
907 */
908 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_BOUND, &d);
909 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECT,
910 &d);
911 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK, BT_CONNECTED,
912 &d);
913 if (d.count)
914 return;
915
916 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
917 }
918
hci_conn_hash_alloc_unset(struct hci_dev * hdev)919 static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
920 {
921 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
922 U16_MAX, GFP_ATOMIC);
923 }
924
__hci_conn_add(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 dst_type,u8 role,u16 handle)925 static struct hci_conn *__hci_conn_add(struct hci_dev *hdev, int type,
926 bdaddr_t *dst, u8 dst_type,
927 u8 role, u16 handle)
928 {
929 struct hci_conn *conn;
930 struct smp_irk *irk = NULL;
931
932 switch (type) {
933 case ACL_LINK:
934 if (!hdev->acl_mtu)
935 return ERR_PTR(-ECONNREFUSED);
936 break;
937 case CIS_LINK:
938 case BIS_LINK:
939 case PA_LINK:
940 if (!hdev->iso_mtu)
941 return ERR_PTR(-ECONNREFUSED);
942 irk = hci_get_irk(hdev, dst, dst_type);
943 break;
944 case LE_LINK:
945 if (hdev->le_mtu && hdev->le_mtu < HCI_MIN_LE_MTU)
946 return ERR_PTR(-ECONNREFUSED);
947 if (!hdev->le_mtu && hdev->acl_mtu < HCI_MIN_LE_MTU)
948 return ERR_PTR(-ECONNREFUSED);
949 irk = hci_get_irk(hdev, dst, dst_type);
950 break;
951 case SCO_LINK:
952 case ESCO_LINK:
953 if (!hdev->sco_pkts)
954 /* Controller does not support SCO or eSCO over HCI */
955 return ERR_PTR(-ECONNREFUSED);
956 break;
957 default:
958 return ERR_PTR(-ECONNREFUSED);
959 }
960
961 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
962
963 conn = kzalloc_obj(*conn);
964 if (!conn)
965 return ERR_PTR(-ENOMEM);
966
967 /* If and IRK exists use its identity address */
968 if (!irk) {
969 bacpy(&conn->dst, dst);
970 conn->dst_type = dst_type;
971 } else {
972 bacpy(&conn->dst, &irk->bdaddr);
973 conn->dst_type = irk->addr_type;
974 }
975
976 bacpy(&conn->src, &hdev->bdaddr);
977 conn->handle = handle;
978 conn->hdev = hdev;
979 conn->type = type;
980 conn->role = role;
981 conn->mode = HCI_CM_ACTIVE;
982 conn->state = BT_OPEN;
983 conn->auth_type = HCI_AT_GENERAL_BONDING;
984 conn->io_capability = hdev->io_capability;
985 conn->remote_auth = 0xff;
986 conn->key_type = 0xff;
987 conn->rssi = HCI_RSSI_INVALID;
988 conn->tx_power = HCI_TX_POWER_INVALID;
989 conn->max_tx_power = HCI_TX_POWER_INVALID;
990 conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
991 conn->sid = HCI_SID_INVALID;
992
993 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
994 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
995
996 /* Set Default Authenticated payload timeout to 30s */
997 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
998
999 if (conn->role == HCI_ROLE_MASTER)
1000 conn->out = true;
1001
1002 switch (type) {
1003 case ACL_LINK:
1004 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
1005 conn->link_policy = hdev->link_policy;
1006 conn->mtu = hdev->acl_mtu;
1007 break;
1008 case LE_LINK:
1009 /* conn->src should reflect the local identity address */
1010 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1011 conn->mtu = hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
1012 /* Use the controller supported PHYS as default until the
1013 * remote features are resolved.
1014 */
1015 conn->le_tx_def_phys = hdev->le_tx_def_phys;
1016 conn->le_rx_def_phys = hdev->le_tx_def_phys;
1017 break;
1018 case CIS_LINK:
1019 /* conn->src should reflect the local identity address */
1020 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1021
1022 if (conn->role == HCI_ROLE_MASTER)
1023 conn->cleanup = cis_cleanup;
1024
1025 conn->mtu = hdev->iso_mtu;
1026 break;
1027 case PA_LINK:
1028 case BIS_LINK:
1029 /* conn->src should reflect the local identity address */
1030 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1031 conn->cleanup = bis_cleanup;
1032 conn->mtu = hdev->iso_mtu;
1033 break;
1034 case SCO_LINK:
1035 if (lmp_esco_capable(hdev))
1036 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
1037 (hdev->esco_type & EDR_ESCO_MASK);
1038 else
1039 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1040
1041 conn->mtu = hdev->sco_mtu;
1042 break;
1043 case ESCO_LINK:
1044 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1045 conn->mtu = hdev->sco_mtu;
1046 break;
1047 }
1048
1049 skb_queue_head_init(&conn->data_q);
1050 skb_queue_head_init(&conn->tx_q.queue);
1051
1052 INIT_LIST_HEAD(&conn->chan_list);
1053 INIT_LIST_HEAD(&conn->link_list);
1054
1055 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1056 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1057 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1058 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1059
1060 atomic_set(&conn->refcnt, 0);
1061
1062 hci_dev_hold(hdev);
1063
1064 hci_conn_hash_add(hdev, conn);
1065
1066 /* The SCO and eSCO connections will only be notified when their
1067 * setup has been completed. This is different to ACL links which
1068 * can be notified right away.
1069 */
1070 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1071 if (hdev->notify)
1072 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1073 }
1074
1075 hci_conn_init_sysfs(conn);
1076 return conn;
1077 }
1078
hci_conn_add_unset(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 dst_type,u8 role)1079 struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1080 bdaddr_t *dst, u8 dst_type, u8 role)
1081 {
1082 int handle;
1083
1084 bt_dev_dbg(hdev, "dst %pMR", dst);
1085
1086 handle = hci_conn_hash_alloc_unset(hdev);
1087 if (unlikely(handle < 0))
1088 return ERR_PTR(-ECONNREFUSED);
1089
1090 return __hci_conn_add(hdev, type, dst, dst_type, role, handle);
1091 }
1092
hci_conn_add(struct hci_dev * hdev,int type,bdaddr_t * dst,u8 dst_type,u8 role,u16 handle)1093 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
1094 u8 dst_type, u8 role, u16 handle)
1095 {
1096 if (handle > HCI_CONN_HANDLE_MAX)
1097 return ERR_PTR(-EINVAL);
1098
1099 return __hci_conn_add(hdev, type, dst, dst_type, role, handle);
1100 }
1101
hci_conn_cleanup_child(struct hci_conn * conn,u8 reason)1102 static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1103 {
1104 if (!reason)
1105 reason = HCI_ERROR_REMOTE_USER_TERM;
1106
1107 /* Due to race, SCO/ISO conn might be not established yet at this point,
1108 * and nothing else will clean it up. In other cases it is done via HCI
1109 * events.
1110 */
1111 switch (conn->type) {
1112 case SCO_LINK:
1113 case ESCO_LINK:
1114 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1115 hci_conn_failed(conn, reason);
1116 break;
1117 case CIS_LINK:
1118 case BIS_LINK:
1119 case PA_LINK:
1120 if ((conn->state != BT_CONNECTED &&
1121 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) ||
1122 test_bit(HCI_CONN_BIG_CREATED, &conn->flags))
1123 hci_conn_failed(conn, reason);
1124 break;
1125 }
1126 }
1127
hci_conn_unlink(struct hci_conn * conn)1128 static void hci_conn_unlink(struct hci_conn *conn)
1129 {
1130 struct hci_dev *hdev = conn->hdev;
1131
1132 bt_dev_dbg(hdev, "hcon %p", conn);
1133
1134 if (!conn->parent) {
1135 struct hci_link *link, *t;
1136
1137 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1138 struct hci_conn *child = link->conn;
1139
1140 hci_conn_unlink(child);
1141
1142 /* If hdev is down it means
1143 * hci_dev_close_sync/hci_conn_hash_flush is in progress
1144 * and links don't need to be cleanup as all connections
1145 * would be cleanup.
1146 */
1147 if (!test_bit(HCI_UP, &hdev->flags))
1148 continue;
1149
1150 hci_conn_cleanup_child(child, conn->abort_reason);
1151 }
1152
1153 return;
1154 }
1155
1156 if (!conn->link)
1157 return;
1158
1159 list_del_rcu(&conn->link->list);
1160 synchronize_rcu();
1161
1162 hci_conn_drop(conn->parent);
1163 hci_conn_put(conn->parent);
1164 conn->parent = NULL;
1165
1166 kfree(conn->link);
1167 conn->link = NULL;
1168 }
1169
hci_conn_del(struct hci_conn * conn)1170 void hci_conn_del(struct hci_conn *conn)
1171 {
1172 struct hci_dev *hdev = conn->hdev;
1173
1174 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1175
1176 hci_conn_unlink(conn);
1177
1178 disable_delayed_work_sync(&conn->disc_work);
1179 disable_delayed_work_sync(&conn->auto_accept_work);
1180 disable_delayed_work_sync(&conn->idle_work);
1181
1182 /* Remove the connection from the list so unacked logic can detect when
1183 * a certain pool is not being utilized.
1184 */
1185 hci_conn_hash_del(hdev, conn);
1186
1187 /* Handle unacked frames:
1188 *
1189 * - In case there are no connection, or if restoring the buffers
1190 * considered in transist would overflow, restore all buffers to the
1191 * pool.
1192 * - Otherwise restore just the buffers considered in transit for the
1193 * hci_conn
1194 */
1195 switch (conn->type) {
1196 case ACL_LINK:
1197 if (!hci_conn_num(hdev, ACL_LINK) ||
1198 hdev->acl_cnt + conn->sent > hdev->acl_pkts)
1199 hdev->acl_cnt = hdev->acl_pkts;
1200 else
1201 hdev->acl_cnt += conn->sent;
1202 break;
1203 case LE_LINK:
1204 cancel_delayed_work(&conn->le_conn_timeout);
1205
1206 if (hdev->le_pkts) {
1207 if (!hci_conn_num(hdev, LE_LINK) ||
1208 hdev->le_cnt + conn->sent > hdev->le_pkts)
1209 hdev->le_cnt = hdev->le_pkts;
1210 else
1211 hdev->le_cnt += conn->sent;
1212 } else {
1213 if ((!hci_conn_num(hdev, LE_LINK) &&
1214 !hci_conn_num(hdev, ACL_LINK)) ||
1215 hdev->acl_cnt + conn->sent > hdev->acl_pkts)
1216 hdev->acl_cnt = hdev->acl_pkts;
1217 else
1218 hdev->acl_cnt += conn->sent;
1219 }
1220 break;
1221 case CIS_LINK:
1222 case BIS_LINK:
1223 case PA_LINK:
1224 if (!hci_iso_count(hdev) ||
1225 hdev->iso_cnt + conn->sent > hdev->iso_pkts)
1226 hdev->iso_cnt = hdev->iso_pkts;
1227 else
1228 hdev->iso_cnt += conn->sent;
1229 break;
1230 }
1231
1232 skb_queue_purge(&conn->data_q);
1233 skb_queue_purge(&conn->tx_q.queue);
1234
1235 /* Remove the connection from the list and cleanup its remaining
1236 * state. This is a separate function since for some cases like
1237 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1238 * rest of hci_conn_del.
1239 */
1240 hci_conn_cleanup(conn);
1241
1242 /* Dequeue callbacks using connection pointer as data */
1243 hci_cmd_sync_dequeue(hdev, NULL, conn, NULL);
1244 }
1245
hci_get_route(bdaddr_t * dst,bdaddr_t * src,uint8_t src_type)1246 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1247 {
1248 int use_src = bacmp(src, BDADDR_ANY);
1249 struct hci_dev *hdev = NULL, *d;
1250
1251 BT_DBG("%pMR -> %pMR", src, dst);
1252
1253 read_lock(&hci_dev_list_lock);
1254
1255 list_for_each_entry(d, &hci_dev_list, list) {
1256 if (!test_bit(HCI_UP, &d->flags) ||
1257 hci_dev_test_flag(d, HCI_USER_CHANNEL))
1258 continue;
1259
1260 /* Simple routing:
1261 * No source address - find interface with bdaddr != dst
1262 * Source address - find interface with bdaddr == src
1263 */
1264
1265 if (use_src) {
1266 bdaddr_t id_addr;
1267 u8 id_addr_type;
1268
1269 if (src_type == BDADDR_BREDR) {
1270 if (!lmp_bredr_capable(d))
1271 continue;
1272 bacpy(&id_addr, &d->bdaddr);
1273 id_addr_type = BDADDR_BREDR;
1274 } else {
1275 if (!lmp_le_capable(d))
1276 continue;
1277
1278 hci_copy_identity_address(d, &id_addr,
1279 &id_addr_type);
1280
1281 /* Convert from HCI to three-value type */
1282 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1283 id_addr_type = BDADDR_LE_PUBLIC;
1284 else
1285 id_addr_type = BDADDR_LE_RANDOM;
1286 }
1287
1288 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1289 hdev = d; break;
1290 }
1291 } else {
1292 if (bacmp(&d->bdaddr, dst)) {
1293 hdev = d; break;
1294 }
1295 }
1296 }
1297
1298 if (hdev)
1299 hdev = hci_dev_hold(hdev);
1300
1301 read_unlock(&hci_dev_list_lock);
1302 return hdev;
1303 }
1304 EXPORT_SYMBOL(hci_get_route);
1305
1306 /* This function requires the caller holds hdev->lock */
hci_le_conn_failed(struct hci_conn * conn,u8 status)1307 static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1308 {
1309 struct hci_dev *hdev = conn->hdev;
1310
1311 hci_connect_le_scan_cleanup(conn, status);
1312
1313 /* Enable advertising in case this was a failed connection
1314 * attempt as a peripheral.
1315 */
1316 hci_enable_advertising(hdev);
1317 }
1318
1319 /* This function requires the caller holds hdev->lock */
hci_conn_failed(struct hci_conn * conn,u8 status)1320 void hci_conn_failed(struct hci_conn *conn, u8 status)
1321 {
1322 struct hci_dev *hdev = conn->hdev;
1323
1324 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1325
1326 switch (conn->type) {
1327 case LE_LINK:
1328 hci_le_conn_failed(conn, status);
1329 break;
1330 case ACL_LINK:
1331 mgmt_connect_failed(hdev, conn, status);
1332 break;
1333 }
1334
1335 /* In case of BIG/PA sync failed, clear conn flags so that
1336 * the conns will be correctly cleaned up by ISO layer
1337 */
1338 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1339 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1340
1341 conn->state = BT_CLOSED;
1342 hci_connect_cfm(conn, status);
1343 hci_conn_del(conn);
1344 }
1345
1346 /* This function requires the caller holds hdev->lock */
hci_conn_set_handle(struct hci_conn * conn,u16 handle)1347 u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1348 {
1349 struct hci_dev *hdev = conn->hdev;
1350
1351 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1352
1353 if (conn->handle == handle)
1354 return 0;
1355
1356 if (handle > HCI_CONN_HANDLE_MAX) {
1357 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1358 handle, HCI_CONN_HANDLE_MAX);
1359 return HCI_ERROR_INVALID_PARAMETERS;
1360 }
1361
1362 /* If abort_reason has been sent it means the connection is being
1363 * aborted and the handle shall not be changed.
1364 */
1365 if (conn->abort_reason)
1366 return conn->abort_reason;
1367
1368 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1369 ida_free(&hdev->unset_handle_ida, conn->handle);
1370
1371 conn->handle = handle;
1372
1373 return 0;
1374 }
1375
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)1376 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1377 u8 dst_type, bool dst_resolved, u8 sec_level,
1378 u16 conn_timeout, u8 role, u8 phy, u8 sec_phy)
1379 {
1380 struct hci_conn *conn;
1381 struct smp_irk *irk;
1382 int err;
1383
1384 /* Let's make sure that le is enabled.*/
1385 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1386 if (lmp_le_capable(hdev))
1387 return ERR_PTR(-ECONNREFUSED);
1388
1389 return ERR_PTR(-EOPNOTSUPP);
1390 }
1391
1392 /* Since the controller supports only one LE connection attempt at a
1393 * time, we return -EBUSY if there is any connection attempt running.
1394 */
1395 if (hci_lookup_le_connect(hdev))
1396 return ERR_PTR(-EBUSY);
1397
1398 /* If there's already a connection object but it's not in
1399 * scanning state it means it must already be established, in
1400 * which case we can't do anything else except report a failure
1401 * to connect.
1402 */
1403 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1404 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1405 return ERR_PTR(-EBUSY);
1406 }
1407
1408 /* Check if the destination address has been resolved by the controller
1409 * since if it did then the identity address shall be used.
1410 */
1411 if (!dst_resolved) {
1412 /* When given an identity address with existing identity
1413 * resolving key, the connection needs to be established
1414 * to a resolvable random address.
1415 *
1416 * Storing the resolvable random address is required here
1417 * to handle connection failures. The address will later
1418 * be resolved back into the original identity address
1419 * from the connect request.
1420 */
1421 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1422 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1423 dst = &irk->rpa;
1424 dst_type = ADDR_LE_DEV_RANDOM;
1425 }
1426 }
1427
1428 if (conn) {
1429 bacpy(&conn->dst, dst);
1430 } else {
1431 conn = hci_conn_add_unset(hdev, LE_LINK, dst, dst_type, role);
1432 if (IS_ERR(conn))
1433 return conn;
1434 hci_conn_hold(conn);
1435 conn->pending_sec_level = sec_level;
1436 }
1437
1438 conn->sec_level = BT_SECURITY_LOW;
1439 conn->conn_timeout = conn_timeout;
1440 conn->le_adv_phy = phy;
1441 conn->le_adv_sec_phy = sec_phy;
1442
1443 err = hci_connect_le_sync(hdev, conn);
1444 if (err) {
1445 hci_conn_del(conn);
1446 return ERR_PTR(err);
1447 }
1448
1449 return conn;
1450 }
1451
is_connected(struct hci_dev * hdev,bdaddr_t * addr,u8 type)1452 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1453 {
1454 struct hci_conn *conn;
1455
1456 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1457 if (!conn)
1458 return false;
1459
1460 if (conn->state != BT_CONNECTED)
1461 return false;
1462
1463 return true;
1464 }
1465
1466 /* This function requires the caller holds hdev->lock */
hci_explicit_conn_params_set(struct hci_dev * hdev,bdaddr_t * addr,u8 addr_type)1467 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1468 bdaddr_t *addr, u8 addr_type)
1469 {
1470 struct hci_conn_params *params;
1471
1472 if (is_connected(hdev, addr, addr_type))
1473 return -EISCONN;
1474
1475 params = hci_conn_params_lookup(hdev, addr, addr_type);
1476 if (!params) {
1477 params = hci_conn_params_add(hdev, addr, addr_type);
1478 if (!params)
1479 return -ENOMEM;
1480
1481 /* If we created new params, mark them to be deleted in
1482 * hci_connect_le_scan_cleanup. It's different case than
1483 * existing disabled params, those will stay after cleanup.
1484 */
1485 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1486 }
1487
1488 /* We're trying to connect, so make sure params are at pend_le_conns */
1489 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1490 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1491 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1492 hci_pend_le_list_del_init(params);
1493 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1494 }
1495
1496 params->explicit_connect = true;
1497
1498 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1499 params->auto_connect);
1500
1501 return 0;
1502 }
1503
qos_set_big(struct hci_dev * hdev,struct bt_iso_qos * qos)1504 static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1505 {
1506 struct hci_conn *conn;
1507 u8 big;
1508
1509 /* Allocate a BIG if not set */
1510 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1511 for (big = 0x00; big < 0xef; big++) {
1512
1513 conn = hci_conn_hash_lookup_big(hdev, big);
1514 if (!conn)
1515 break;
1516 }
1517
1518 if (big == 0xef)
1519 return -EADDRNOTAVAIL;
1520
1521 /* Update BIG */
1522 qos->bcast.big = big;
1523 }
1524
1525 return 0;
1526 }
1527
qos_set_bis(struct hci_dev * hdev,struct bt_iso_qos * qos)1528 static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1529 {
1530 struct hci_conn *conn;
1531 u8 bis;
1532
1533 /* Allocate BIS if not set */
1534 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1535 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1536 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1537
1538 if (conn) {
1539 /* If the BIG handle is already matched to an advertising
1540 * handle, do not allocate a new one.
1541 */
1542 qos->bcast.bis = conn->iso_qos.bcast.bis;
1543 return 0;
1544 }
1545 }
1546
1547 /* Find an unused adv set to advertise BIS, skip instance 0x00
1548 * since it is reserved as general purpose set.
1549 */
1550 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1551 bis++) {
1552
1553 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1554 if (!conn)
1555 break;
1556 }
1557
1558 if (bis == hdev->le_num_of_adv_sets)
1559 return -EADDRNOTAVAIL;
1560
1561 /* Update BIS */
1562 qos->bcast.bis = bis;
1563 }
1564
1565 return 0;
1566 }
1567
1568 /* 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)1569 static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1570 __u8 sid, struct bt_iso_qos *qos,
1571 __u8 base_len, __u8 *base, u16 timeout)
1572 {
1573 struct hci_conn *conn;
1574 int err;
1575
1576 /* Let's make sure that le is enabled.*/
1577 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1578 if (lmp_le_capable(hdev))
1579 return ERR_PTR(-ECONNREFUSED);
1580 return ERR_PTR(-EOPNOTSUPP);
1581 }
1582
1583 err = qos_set_big(hdev, qos);
1584 if (err)
1585 return ERR_PTR(err);
1586
1587 err = qos_set_bis(hdev, qos);
1588 if (err)
1589 return ERR_PTR(err);
1590
1591 /* Check if the LE Create BIG command has already been sent */
1592 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1593 qos->bcast.big);
1594 if (conn)
1595 return ERR_PTR(-EADDRINUSE);
1596
1597 /* Check BIS settings against other bound BISes, since all
1598 * BISes in a BIG must have the same value for all parameters
1599 */
1600 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1601
1602 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1603 base_len != conn->le_per_adv_data_len ||
1604 memcmp(conn->le_per_adv_data, base, base_len)))
1605 return ERR_PTR(-EADDRINUSE);
1606
1607 conn = hci_conn_add_unset(hdev, BIS_LINK, dst, 0, HCI_ROLE_MASTER);
1608 if (IS_ERR(conn))
1609 return conn;
1610
1611 conn->state = BT_CONNECT;
1612 conn->sid = sid;
1613 conn->conn_timeout = timeout;
1614
1615 hci_conn_hold(conn);
1616 return conn;
1617 }
1618
1619 /* 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)1620 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1621 u8 dst_type, u8 sec_level,
1622 u16 conn_timeout,
1623 enum conn_reasons conn_reason)
1624 {
1625 struct hci_conn *conn;
1626
1627 /* Let's make sure that le is enabled.*/
1628 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1629 if (lmp_le_capable(hdev))
1630 return ERR_PTR(-ECONNREFUSED);
1631
1632 return ERR_PTR(-EOPNOTSUPP);
1633 }
1634
1635 /* Some devices send ATT messages as soon as the physical link is
1636 * established. To be able to handle these ATT messages, the user-
1637 * space first establishes the connection and then starts the pairing
1638 * process.
1639 *
1640 * So if a hci_conn object already exists for the following connection
1641 * attempt, we simply update pending_sec_level and auth_type fields
1642 * and return the object found.
1643 */
1644 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1645 if (conn) {
1646 if (conn->pending_sec_level < sec_level)
1647 conn->pending_sec_level = sec_level;
1648 goto done;
1649 }
1650
1651 BT_DBG("requesting refresh of dst_addr");
1652
1653 conn = hci_conn_add_unset(hdev, LE_LINK, dst, dst_type,
1654 HCI_ROLE_MASTER);
1655 if (IS_ERR(conn))
1656 return conn;
1657
1658 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1659 hci_conn_del(conn);
1660 return ERR_PTR(-EBUSY);
1661 }
1662
1663 conn->state = BT_CONNECT;
1664 set_bit(HCI_CONN_SCANNING, &conn->flags);
1665 conn->sec_level = BT_SECURITY_LOW;
1666 conn->pending_sec_level = sec_level;
1667 conn->conn_timeout = conn_timeout;
1668 conn->conn_reason = conn_reason;
1669
1670 hci_update_passive_scan(hdev);
1671
1672 done:
1673 hci_conn_hold(conn);
1674 return conn;
1675 }
1676
hci_connect_acl(struct hci_dev * hdev,bdaddr_t * dst,u8 sec_level,u8 auth_type,enum conn_reasons conn_reason,u16 timeout)1677 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1678 u8 sec_level, u8 auth_type,
1679 enum conn_reasons conn_reason, u16 timeout)
1680 {
1681 struct hci_conn *acl;
1682
1683 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1684 if (lmp_bredr_capable(hdev))
1685 return ERR_PTR(-ECONNREFUSED);
1686
1687 return ERR_PTR(-EOPNOTSUPP);
1688 }
1689
1690 /* Reject outgoing connection to device with same BD ADDR against
1691 * CVE-2020-26555
1692 */
1693 if (!bacmp(&hdev->bdaddr, dst)) {
1694 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1695 dst);
1696 return ERR_PTR(-ECONNREFUSED);
1697 }
1698
1699 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1700 if (!acl) {
1701 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, 0,
1702 HCI_ROLE_MASTER);
1703 if (IS_ERR(acl))
1704 return acl;
1705 }
1706
1707 hci_conn_hold(acl);
1708
1709 acl->conn_reason = conn_reason;
1710 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1711 int err;
1712
1713 acl->sec_level = BT_SECURITY_LOW;
1714 acl->pending_sec_level = sec_level;
1715 acl->auth_type = auth_type;
1716 acl->conn_timeout = timeout;
1717
1718 err = hci_connect_acl_sync(hdev, acl);
1719 if (err) {
1720 hci_conn_del(acl);
1721 return ERR_PTR(err);
1722 }
1723 }
1724
1725 return acl;
1726 }
1727
hci_conn_link(struct hci_conn * parent,struct hci_conn * conn)1728 static struct hci_link *hci_conn_link(struct hci_conn *parent,
1729 struct hci_conn *conn)
1730 {
1731 struct hci_dev *hdev = parent->hdev;
1732 struct hci_link *link;
1733
1734 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1735
1736 if (conn->link)
1737 return conn->link;
1738
1739 if (conn->parent)
1740 return NULL;
1741
1742 link = kzalloc_obj(*link);
1743 if (!link)
1744 return NULL;
1745
1746 link->conn = hci_conn_hold(conn);
1747 conn->link = link;
1748 conn->parent = hci_conn_get(parent);
1749
1750 /* Use list_add_tail_rcu append to the list */
1751 list_add_tail_rcu(&link->list, &parent->link_list);
1752
1753 return link;
1754 }
1755
hci_connect_sco(struct hci_dev * hdev,int type,bdaddr_t * dst,__u16 setting,struct bt_codec * codec,u16 timeout)1756 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1757 __u16 setting, struct bt_codec *codec,
1758 u16 timeout)
1759 {
1760 struct hci_conn *acl;
1761 struct hci_conn *sco;
1762 struct hci_link *link;
1763
1764 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1765 CONN_REASON_SCO_CONNECT, timeout);
1766 if (IS_ERR(acl))
1767 return acl;
1768
1769 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1770 if (!sco) {
1771 sco = hci_conn_add_unset(hdev, type, dst, 0, HCI_ROLE_MASTER);
1772 if (IS_ERR(sco)) {
1773 hci_conn_drop(acl);
1774 return sco;
1775 }
1776 }
1777
1778 link = hci_conn_link(acl, sco);
1779 if (!link) {
1780 hci_conn_drop(acl);
1781 hci_conn_drop(sco);
1782 return ERR_PTR(-ENOLINK);
1783 }
1784
1785 sco->setting = setting;
1786 sco->codec = *codec;
1787
1788 if (acl->state == BT_CONNECTED &&
1789 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1790 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1791 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1792
1793 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1794 /* defer SCO setup until mode change completed */
1795 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1796 return sco;
1797 }
1798
1799 hci_sco_setup(acl, 0x00);
1800 }
1801
1802 return sco;
1803 }
1804
hci_le_create_big(struct hci_conn * conn,struct bt_iso_qos * qos)1805 static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1806 {
1807 struct hci_dev *hdev = conn->hdev;
1808 struct hci_cp_le_create_big cp;
1809 struct iso_list_data data;
1810
1811 memset(&cp, 0, sizeof(cp));
1812
1813 data.big = qos->bcast.big;
1814 data.bis = qos->bcast.bis;
1815 data.count = 0;
1816
1817 /* Create a BIS for each bound connection */
1818 hci_conn_hash_list_state(hdev, bis_list, BIS_LINK,
1819 BT_BOUND, &data);
1820
1821 cp.handle = qos->bcast.big;
1822 cp.adv_handle = qos->bcast.bis;
1823 cp.num_bis = data.count;
1824 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1825 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1826 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1827 cp.bis.rtn = qos->bcast.out.rtn;
1828 cp.bis.phy = qos->bcast.out.phys;
1829 cp.bis.packing = qos->bcast.packing;
1830 cp.bis.framing = qos->bcast.framing;
1831 cp.bis.encryption = qos->bcast.encryption;
1832 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1833
1834 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1835 }
1836
set_cig_params_sync(struct hci_dev * hdev,void * data)1837 static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1838 {
1839 DEFINE_FLEX(struct hci_cp_le_set_cig_params, pdu, cis, num_cis, 0x1f);
1840 u8 cig_id = PTR_UINT(data);
1841 struct hci_conn *conn;
1842 struct bt_iso_qos *qos;
1843 u8 aux_num_cis = 0;
1844 u8 cis_id;
1845
1846 conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1847 if (!conn)
1848 return 0;
1849
1850 qos = &conn->iso_qos;
1851 pdu->cig_id = cig_id;
1852 hci_cpu_to_le24(qos->ucast.out.interval, pdu->c_interval);
1853 hci_cpu_to_le24(qos->ucast.in.interval, pdu->p_interval);
1854 pdu->sca = qos->ucast.sca;
1855 pdu->packing = qos->ucast.packing;
1856 pdu->framing = qos->ucast.framing;
1857 pdu->c_latency = cpu_to_le16(qos->ucast.out.latency);
1858 pdu->p_latency = cpu_to_le16(qos->ucast.in.latency);
1859
1860 /* Reprogram all CIS(s) with the same CIG, valid range are:
1861 * num_cis: 0x00 to 0x1F
1862 * cis_id: 0x00 to 0xEF
1863 */
1864 for (cis_id = 0x00; cis_id < 0xf0 &&
1865 aux_num_cis < pdu->num_cis; cis_id++) {
1866 struct hci_cis_params *cis;
1867
1868 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1869 if (!conn)
1870 continue;
1871
1872 qos = &conn->iso_qos;
1873
1874 cis = &pdu->cis[aux_num_cis++];
1875 cis->cis_id = cis_id;
1876 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1877 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1878 cis->c_phys = qos->ucast.out.phys ? qos->ucast.out.phys :
1879 qos->ucast.in.phys;
1880 cis->p_phys = qos->ucast.in.phys ? qos->ucast.in.phys :
1881 qos->ucast.out.phys;
1882 cis->c_rtn = qos->ucast.out.rtn;
1883 cis->p_rtn = qos->ucast.in.rtn;
1884 }
1885 pdu->num_cis = aux_num_cis;
1886
1887 if (!pdu->num_cis)
1888 return 0;
1889
1890 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1891 struct_size(pdu, cis, pdu->num_cis),
1892 pdu, HCI_CMD_TIMEOUT);
1893 }
1894
hci_le_set_cig_params(struct hci_conn * conn,struct bt_iso_qos * qos)1895 static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1896 {
1897 struct hci_dev *hdev = conn->hdev;
1898 struct iso_list_data data;
1899
1900 memset(&data, 0, sizeof(data));
1901
1902 /* Allocate first still reconfigurable CIG if not set */
1903 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1904 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1905 data.count = 0;
1906
1907 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK,
1908 BT_CONNECT, &data);
1909 if (data.count)
1910 continue;
1911
1912 hci_conn_hash_list_state(hdev, find_cis, CIS_LINK,
1913 BT_CONNECTED, &data);
1914 if (!data.count)
1915 break;
1916 }
1917
1918 if (data.cig == 0xf0)
1919 return false;
1920
1921 /* Update CIG */
1922 qos->ucast.cig = data.cig;
1923 }
1924
1925 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1926 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1927 qos->ucast.cis))
1928 return false;
1929 goto done;
1930 }
1931
1932 /* Allocate first available CIS if not set */
1933 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1934 data.cis++) {
1935 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1936 data.cis)) {
1937 /* Update CIS */
1938 qos->ucast.cis = data.cis;
1939 break;
1940 }
1941 }
1942
1943 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1944 return false;
1945
1946 done:
1947 if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1948 UINT_PTR(qos->ucast.cig), NULL) < 0)
1949 return false;
1950
1951 return true;
1952 }
1953
hci_bind_cis(struct hci_dev * hdev,bdaddr_t * dst,__u8 dst_type,struct bt_iso_qos * qos,u16 timeout)1954 struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1955 __u8 dst_type, struct bt_iso_qos *qos,
1956 u16 timeout)
1957 {
1958 struct hci_conn *cis;
1959
1960 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1961 qos->ucast.cis);
1962 if (!cis) {
1963 cis = hci_conn_add_unset(hdev, CIS_LINK, dst, dst_type,
1964 HCI_ROLE_MASTER);
1965 if (IS_ERR(cis))
1966 return cis;
1967 cis->cleanup = cis_cleanup;
1968 cis->dst_type = dst_type;
1969 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1970 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1971 cis->conn_timeout = timeout;
1972 }
1973
1974 if (cis->state == BT_CONNECTED)
1975 return cis;
1976
1977 /* Check if CIS has been set and the settings matches */
1978 if (cis->state == BT_BOUND &&
1979 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1980 return cis;
1981
1982 /* Update LINK PHYs according to QoS preference */
1983 cis->le_tx_phy = qos->ucast.out.phys;
1984 cis->le_rx_phy = qos->ucast.in.phys;
1985
1986 /* If output interval is not set use the input interval as it cannot be
1987 * 0x000000.
1988 */
1989 if (!qos->ucast.out.interval)
1990 qos->ucast.out.interval = qos->ucast.in.interval;
1991
1992 /* If input interval is not set use the output interval as it cannot be
1993 * 0x000000.
1994 */
1995 if (!qos->ucast.in.interval)
1996 qos->ucast.in.interval = qos->ucast.out.interval;
1997
1998 /* If output latency is not set use the input latency as it cannot be
1999 * 0x0000.
2000 */
2001 if (!qos->ucast.out.latency)
2002 qos->ucast.out.latency = qos->ucast.in.latency;
2003
2004 /* If input latency is not set use the output latency as it cannot be
2005 * 0x0000.
2006 */
2007 if (!qos->ucast.in.latency)
2008 qos->ucast.in.latency = qos->ucast.out.latency;
2009
2010 if (!hci_le_set_cig_params(cis, qos)) {
2011 hci_conn_drop(cis);
2012 return ERR_PTR(-EINVAL);
2013 }
2014
2015 hci_conn_hold(cis);
2016
2017 cis->iso_qos = *qos;
2018 cis->state = BT_BOUND;
2019
2020 return cis;
2021 }
2022
hci_iso_setup_path(struct hci_conn * conn)2023 bool hci_iso_setup_path(struct hci_conn *conn)
2024 {
2025 struct hci_dev *hdev = conn->hdev;
2026 struct hci_cp_le_setup_iso_path cmd;
2027
2028 memset(&cmd, 0, sizeof(cmd));
2029
2030 if (conn->iso_qos.ucast.out.sdu) {
2031 cmd.handle = cpu_to_le16(conn->handle);
2032 cmd.direction = 0x00; /* Input (Host to Controller) */
2033 cmd.path = 0x00; /* HCI path if enabled */
2034 cmd.codec = 0x03; /* Transparent Data */
2035
2036 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2037 &cmd) < 0)
2038 return false;
2039 }
2040
2041 if (conn->iso_qos.ucast.in.sdu) {
2042 cmd.handle = cpu_to_le16(conn->handle);
2043 cmd.direction = 0x01; /* Output (Controller to Host) */
2044 cmd.path = 0x00; /* HCI path if enabled */
2045 cmd.codec = 0x03; /* Transparent Data */
2046
2047 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
2048 &cmd) < 0)
2049 return false;
2050 }
2051
2052 return true;
2053 }
2054
hci_conn_check_create_cis(struct hci_conn * conn)2055 int hci_conn_check_create_cis(struct hci_conn *conn)
2056 {
2057 if (conn->type != CIS_LINK)
2058 return -EINVAL;
2059
2060 if (!conn->parent || conn->parent->state != BT_CONNECTED ||
2061 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
2062 return 1;
2063
2064 return 0;
2065 }
2066
hci_create_cis_sync(struct hci_dev * hdev,void * data)2067 static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
2068 {
2069 return hci_le_create_cis_sync(hdev);
2070 }
2071
hci_le_create_cis_pending(struct hci_dev * hdev)2072 int hci_le_create_cis_pending(struct hci_dev *hdev)
2073 {
2074 struct hci_conn *conn;
2075 bool pending = false;
2076
2077 rcu_read_lock();
2078
2079 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2080 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2081 rcu_read_unlock();
2082 return -EBUSY;
2083 }
2084
2085 if (!hci_conn_check_create_cis(conn))
2086 pending = true;
2087 }
2088
2089 rcu_read_unlock();
2090
2091 if (!pending)
2092 return 0;
2093
2094 /* Queue Create CIS */
2095 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2096 }
2097
hci_iso_qos_setup(struct hci_dev * hdev,struct hci_conn * conn,struct bt_iso_io_qos * qos,__u8 phys)2098 static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2099 struct bt_iso_io_qos *qos, __u8 phys)
2100 {
2101 /* Only set MTU if PHY is enabled */
2102 if (!qos->sdu && qos->phys)
2103 qos->sdu = conn->mtu;
2104
2105 /* Use the same PHY as ACL if set to any */
2106 if (qos->phys == BT_ISO_PHY_ANY)
2107 qos->phys = phys;
2108
2109 /* Use LE ACL connection interval if not set */
2110 if (!qos->interval)
2111 /* ACL interval unit in 1.25 ms to us */
2112 qos->interval = conn->le_conn_interval * 1250;
2113
2114 /* Use LE ACL connection latency if not set */
2115 if (!qos->latency)
2116 qos->latency = conn->le_conn_latency;
2117 }
2118
create_big_sync(struct hci_dev * hdev,void * data)2119 static int create_big_sync(struct hci_dev *hdev, void *data)
2120 {
2121 struct hci_conn *conn = data;
2122 struct bt_iso_qos *qos = &conn->iso_qos;
2123 u16 interval, sync_interval = 0;
2124 u32 flags = 0;
2125 int err;
2126
2127 if (qos->bcast.out.phys == BIT(1))
2128 flags |= MGMT_ADV_FLAG_SEC_2M;
2129
2130 /* Align intervals */
2131 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2132
2133 if (qos->bcast.bis)
2134 sync_interval = interval * 4;
2135
2136 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->sid,
2137 conn->le_per_adv_data_len,
2138 conn->le_per_adv_data, flags, interval,
2139 interval, sync_interval);
2140 if (err)
2141 return err;
2142
2143 return hci_le_create_big(conn, &conn->iso_qos);
2144 }
2145
hci_pa_create_sync(struct hci_dev * hdev,bdaddr_t * dst,__u8 dst_type,__u8 sid,struct bt_iso_qos * qos)2146 struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst,
2147 __u8 dst_type, __u8 sid,
2148 struct bt_iso_qos *qos)
2149 {
2150 struct hci_conn *conn;
2151
2152 bt_dev_dbg(hdev, "dst %pMR type %d sid %d", dst, dst_type, sid);
2153
2154 conn = hci_conn_add_unset(hdev, PA_LINK, dst, dst_type, HCI_ROLE_SLAVE);
2155 if (IS_ERR(conn))
2156 return conn;
2157
2158 conn->iso_qos = *qos;
2159 conn->sid = sid;
2160 conn->state = BT_LISTEN;
2161 conn->conn_timeout = msecs_to_jiffies(qos->bcast.sync_timeout * 10);
2162
2163 hci_conn_hold(conn);
2164
2165 hci_connect_pa_sync(hdev, conn);
2166
2167 return conn;
2168 }
2169
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[])2170 int hci_conn_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2171 struct bt_iso_qos *qos, __u16 sync_handle,
2172 __u8 num_bis, __u8 bis[])
2173 {
2174 int err;
2175
2176 if (num_bis < 0x01 || num_bis > ISO_MAX_NUM_BIS)
2177 return -EINVAL;
2178
2179 err = qos_set_big(hdev, qos);
2180 if (err)
2181 return err;
2182
2183 if (hcon) {
2184 /* Update hcon QoS */
2185 hcon->iso_qos = *qos;
2186
2187 hcon->num_bis = num_bis;
2188 memcpy(hcon->bis, bis, num_bis);
2189 hcon->conn_timeout = msecs_to_jiffies(qos->bcast.timeout * 10);
2190 }
2191
2192 return hci_connect_big_sync(hdev, hcon);
2193 }
2194
create_big_complete(struct hci_dev * hdev,void * data,int err)2195 static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2196 {
2197 struct hci_conn *conn = data;
2198
2199 bt_dev_dbg(hdev, "conn %p", conn);
2200
2201 if (err) {
2202 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2203 hci_connect_cfm(conn, err);
2204 hci_conn_del(conn);
2205 }
2206 }
2207
hci_bind_bis(struct hci_dev * hdev,bdaddr_t * dst,__u8 sid,struct bt_iso_qos * qos,__u8 base_len,__u8 * base,u16 timeout)2208 struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst, __u8 sid,
2209 struct bt_iso_qos *qos,
2210 __u8 base_len, __u8 *base, u16 timeout)
2211 {
2212 struct hci_conn *conn;
2213 struct hci_conn *parent;
2214 __u8 eir[HCI_MAX_PER_AD_LENGTH];
2215 struct hci_link *link;
2216
2217 /* Look for any BIS that is open for rebinding */
2218 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN,
2219 HCI_ROLE_MASTER);
2220 if (conn) {
2221 memcpy(qos, &conn->iso_qos, sizeof(*qos));
2222 conn->state = BT_CONNECTED;
2223 return conn;
2224 }
2225
2226 if (base_len && base)
2227 base_len = eir_append_service_data(eir, 0, 0x1851,
2228 base, base_len);
2229
2230 /* We need hci_conn object using the BDADDR_ANY as dst */
2231 conn = hci_add_bis(hdev, dst, sid, qos, base_len, eir, timeout);
2232 if (IS_ERR(conn))
2233 return conn;
2234
2235 /* Update LINK PHYs according to QoS preference */
2236 conn->le_tx_def_phys = qos->bcast.out.phys;
2237
2238 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2239 if (base_len && base) {
2240 memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2241 conn->le_per_adv_data_len = base_len;
2242 }
2243
2244 hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2245 conn->le_tx_def_phys ? conn->le_tx_def_phys :
2246 hdev->le_tx_def_phys);
2247
2248 conn->iso_qos = *qos;
2249 conn->state = BT_BOUND;
2250
2251 /* Link BISes together */
2252 parent = hci_conn_hash_lookup_big(hdev,
2253 conn->iso_qos.bcast.big);
2254 if (parent && parent != conn) {
2255 link = hci_conn_link(parent, conn);
2256 hci_conn_drop(conn);
2257 if (!link)
2258 return ERR_PTR(-ENOLINK);
2259 }
2260
2261 return conn;
2262 }
2263
hci_past_bis(struct hci_conn * conn,bdaddr_t * dst,__u8 dst_type)2264 int hci_past_bis(struct hci_conn *conn, bdaddr_t *dst, __u8 dst_type)
2265 {
2266 struct hci_conn *le;
2267
2268 /* Lookup existing LE connection to rebind to */
2269 le = hci_conn_hash_lookup_le(conn->hdev, dst, dst_type);
2270 if (!le)
2271 return -EINVAL;
2272
2273 return hci_past_sync(conn, le);
2274 }
2275
bis_mark_per_adv(struct hci_conn * conn,void * data)2276 static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2277 {
2278 struct iso_list_data *d = data;
2279
2280 /* Skip if not broadcast/ANY address */
2281 if (bacmp(&conn->dst, BDADDR_ANY))
2282 return;
2283
2284 if (d->big != conn->iso_qos.bcast.big ||
2285 d->bis == BT_ISO_QOS_BIS_UNSET ||
2286 d->bis != conn->iso_qos.bcast.bis)
2287 return;
2288
2289 set_bit(HCI_CONN_PER_ADV, &conn->flags);
2290 }
2291
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)2292 struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2293 __u8 dst_type, __u8 sid,
2294 struct bt_iso_qos *qos,
2295 __u8 base_len, __u8 *base, u16 timeout)
2296 {
2297 struct hci_conn *conn;
2298 int err;
2299 struct iso_list_data data;
2300
2301 conn = hci_bind_bis(hdev, dst, sid, qos, base_len, base, timeout);
2302 if (IS_ERR(conn))
2303 return conn;
2304
2305 if (conn->state == BT_CONNECTED)
2306 return conn;
2307
2308 /* Check if SID needs to be allocated then search for the first
2309 * available.
2310 */
2311 if (conn->sid == HCI_SID_INVALID) {
2312 u8 sid;
2313
2314 for (sid = 0; sid <= 0x0f; sid++) {
2315 if (!hci_find_adv_sid(hdev, sid)) {
2316 conn->sid = sid;
2317 break;
2318 }
2319 }
2320 }
2321
2322 data.big = qos->bcast.big;
2323 data.bis = qos->bcast.bis;
2324
2325 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2326 * the start periodic advertising and create BIG commands have
2327 * been queued
2328 */
2329 hci_conn_hash_list_state(hdev, bis_mark_per_adv, BIS_LINK,
2330 BT_BOUND, &data);
2331
2332 /* Queue start periodic advertising and create BIG */
2333 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2334 create_big_complete);
2335 if (err < 0) {
2336 hci_conn_drop(conn);
2337 return ERR_PTR(err);
2338 }
2339
2340 return conn;
2341 }
2342
hci_connect_cis(struct hci_dev * hdev,bdaddr_t * dst,__u8 dst_type,struct bt_iso_qos * qos,u16 timeout)2343 struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2344 __u8 dst_type, struct bt_iso_qos *qos,
2345 u16 timeout)
2346 {
2347 struct hci_conn *le;
2348 struct hci_conn *cis;
2349 struct hci_link *link;
2350
2351 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2352 le = hci_connect_le(hdev, dst, dst_type, false,
2353 BT_SECURITY_LOW,
2354 HCI_LE_CONN_TIMEOUT,
2355 HCI_ROLE_SLAVE, 0, 0);
2356 else
2357 le = hci_connect_le_scan(hdev, dst, dst_type,
2358 BT_SECURITY_LOW,
2359 HCI_LE_CONN_TIMEOUT,
2360 CONN_REASON_ISO_CONNECT);
2361 if (IS_ERR(le))
2362 return le;
2363
2364 hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2365 le->le_tx_def_phys ? le->le_tx_def_phys :
2366 hdev->le_tx_def_phys);
2367 hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2368 le->le_rx_def_phys ? le->le_rx_def_phys :
2369 hdev->le_rx_def_phys);
2370
2371 cis = hci_bind_cis(hdev, dst, dst_type, qos, timeout);
2372 if (IS_ERR(cis)) {
2373 hci_conn_drop(le);
2374 return cis;
2375 }
2376
2377 link = hci_conn_link(le, cis);
2378 hci_conn_drop(cis);
2379 if (!link) {
2380 hci_conn_drop(le);
2381 return ERR_PTR(-ENOLINK);
2382 }
2383
2384 cis->state = BT_CONNECT;
2385
2386 hci_le_create_cis_pending(hdev);
2387
2388 return cis;
2389 }
2390
2391 /* Check link security requirement */
hci_conn_check_link_mode(struct hci_conn * conn)2392 int hci_conn_check_link_mode(struct hci_conn *conn)
2393 {
2394 BT_DBG("hcon %p", conn);
2395
2396 /* In Secure Connections Only mode, it is required that Secure
2397 * Connections is used and the link is encrypted with AES-CCM
2398 * using a P-256 authenticated combination key.
2399 */
2400 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2401 if (!hci_conn_sc_enabled(conn) ||
2402 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2403 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2404 return 0;
2405 }
2406
2407 /* AES encryption is required for Level 4:
2408 *
2409 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2410 * page 1319:
2411 *
2412 * 128-bit equivalent strength for link and encryption keys
2413 * required using FIPS approved algorithms (E0 not allowed,
2414 * SAFER+ not allowed, and P-192 not allowed; encryption key
2415 * not shortened)
2416 */
2417 if (conn->sec_level == BT_SECURITY_FIPS &&
2418 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2419 bt_dev_err(conn->hdev,
2420 "Invalid security: Missing AES-CCM usage");
2421 return 0;
2422 }
2423
2424 if (hci_conn_ssp_enabled(conn) &&
2425 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2426 return 0;
2427
2428 return 1;
2429 }
2430
2431 /* Authenticate remote device */
hci_conn_auth(struct hci_conn * conn,__u8 sec_level,__u8 auth_type)2432 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2433 {
2434 BT_DBG("hcon %p", conn);
2435
2436 if (conn->pending_sec_level > sec_level)
2437 sec_level = conn->pending_sec_level;
2438
2439 if (sec_level > conn->sec_level)
2440 conn->pending_sec_level = sec_level;
2441 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2442 return 1;
2443
2444 /* Make sure we preserve an existing MITM requirement*/
2445 auth_type |= (conn->auth_type & 0x01);
2446
2447 conn->auth_type = auth_type;
2448
2449 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2450 struct hci_cp_auth_requested cp;
2451
2452 cp.handle = cpu_to_le16(conn->handle);
2453 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2454 sizeof(cp), &cp);
2455
2456 /* Set the ENCRYPT_PEND to trigger encryption after
2457 * authentication.
2458 */
2459 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2460 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2461 }
2462
2463 return 0;
2464 }
2465
2466 /* Encrypt the link */
hci_conn_encrypt(struct hci_conn * conn)2467 static void hci_conn_encrypt(struct hci_conn *conn)
2468 {
2469 BT_DBG("hcon %p", conn);
2470
2471 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2472 struct hci_cp_set_conn_encrypt cp;
2473 cp.handle = cpu_to_le16(conn->handle);
2474 cp.encrypt = 0x01;
2475 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2476 &cp);
2477 }
2478 }
2479
2480 /* Enable security */
hci_conn_security(struct hci_conn * conn,__u8 sec_level,__u8 auth_type,bool initiator)2481 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2482 bool initiator)
2483 {
2484 BT_DBG("hcon %p", conn);
2485
2486 if (conn->type == LE_LINK)
2487 return smp_conn_security(conn, sec_level);
2488
2489 /* For sdp we don't need the link key. */
2490 if (sec_level == BT_SECURITY_SDP)
2491 return 1;
2492
2493 /* For non 2.1 devices and low security level we don't need the link
2494 key. */
2495 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2496 return 1;
2497
2498 /* For other security levels we need the link key. */
2499 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2500 goto auth;
2501
2502 switch (conn->key_type) {
2503 case HCI_LK_AUTH_COMBINATION_P256:
2504 /* An authenticated FIPS approved combination key has
2505 * sufficient security for security level 4 or lower.
2506 */
2507 if (sec_level <= BT_SECURITY_FIPS)
2508 goto encrypt;
2509 break;
2510 case HCI_LK_AUTH_COMBINATION_P192:
2511 /* An authenticated combination key has sufficient security for
2512 * security level 3 or lower.
2513 */
2514 if (sec_level <= BT_SECURITY_HIGH)
2515 goto encrypt;
2516 break;
2517 case HCI_LK_UNAUTH_COMBINATION_P192:
2518 case HCI_LK_UNAUTH_COMBINATION_P256:
2519 /* An unauthenticated combination key has sufficient security
2520 * for security level 2 or lower.
2521 */
2522 if (sec_level <= BT_SECURITY_MEDIUM)
2523 goto encrypt;
2524 break;
2525 case HCI_LK_COMBINATION:
2526 /* A combination key has always sufficient security for the
2527 * security levels 2 or lower. High security level requires the
2528 * combination key is generated using maximum PIN code length
2529 * (16). For pre 2.1 units.
2530 */
2531 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2532 goto encrypt;
2533 break;
2534 default:
2535 break;
2536 }
2537
2538 auth:
2539 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2540 return 0;
2541
2542 if (initiator)
2543 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2544
2545 if (!hci_conn_auth(conn, sec_level, auth_type))
2546 return 0;
2547
2548 encrypt:
2549 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2550 /* Ensure that the encryption key size has been read,
2551 * otherwise stall the upper layer responses.
2552 */
2553 if (!conn->enc_key_size)
2554 return 0;
2555
2556 /* Nothing else needed, all requirements are met */
2557 return 1;
2558 }
2559
2560 hci_conn_encrypt(conn);
2561 return 0;
2562 }
2563 EXPORT_SYMBOL(hci_conn_security);
2564
2565 /* Check secure link requirement */
hci_conn_check_secure(struct hci_conn * conn,__u8 sec_level)2566 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2567 {
2568 BT_DBG("hcon %p", conn);
2569
2570 /* Accept if non-secure or higher security level is required */
2571 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2572 return 1;
2573
2574 /* Accept if secure or higher security level is already present */
2575 if (conn->sec_level == BT_SECURITY_HIGH ||
2576 conn->sec_level == BT_SECURITY_FIPS)
2577 return 1;
2578
2579 /* Reject not secure link */
2580 return 0;
2581 }
2582 EXPORT_SYMBOL(hci_conn_check_secure);
2583
2584 /* Switch role */
hci_conn_switch_role(struct hci_conn * conn,__u8 role)2585 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2586 {
2587 BT_DBG("hcon %p", conn);
2588
2589 if (role == conn->role)
2590 return 1;
2591
2592 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2593 struct hci_cp_switch_role cp;
2594 bacpy(&cp.bdaddr, &conn->dst);
2595 cp.role = role;
2596 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2597 }
2598
2599 return 0;
2600 }
2601 EXPORT_SYMBOL(hci_conn_switch_role);
2602
2603 /* Enter active mode */
hci_conn_enter_active_mode(struct hci_conn * conn,__u8 force_active)2604 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2605 {
2606 struct hci_dev *hdev = conn->hdev;
2607
2608 BT_DBG("hcon %p mode %d", conn, conn->mode);
2609
2610 if (conn->mode != HCI_CM_SNIFF)
2611 goto timer;
2612
2613 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2614 goto timer;
2615
2616 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2617 struct hci_cp_exit_sniff_mode cp;
2618 cp.handle = cpu_to_le16(conn->handle);
2619 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2620 }
2621
2622 timer:
2623 if (hdev->idle_timeout > 0)
2624 mod_delayed_work(hdev->workqueue, &conn->idle_work,
2625 msecs_to_jiffies(hdev->idle_timeout));
2626 }
2627
2628 /* Drop all connection on the device */
hci_conn_hash_flush(struct hci_dev * hdev)2629 void hci_conn_hash_flush(struct hci_dev *hdev)
2630 {
2631 struct list_head *head = &hdev->conn_hash.list;
2632 struct hci_conn *conn;
2633
2634 BT_DBG("hdev %s", hdev->name);
2635
2636 /* We should not traverse the list here, because hci_conn_del
2637 * can remove extra links, which may cause the list traversal
2638 * to hit items that have already been released.
2639 */
2640 while ((conn = list_first_entry_or_null(head,
2641 struct hci_conn,
2642 list)) != NULL) {
2643 conn->state = BT_CLOSED;
2644 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2645 hci_conn_del(conn);
2646 }
2647 }
2648
get_link_mode(struct hci_conn * conn)2649 static u32 get_link_mode(struct hci_conn *conn)
2650 {
2651 u32 link_mode = 0;
2652
2653 if (conn->role == HCI_ROLE_MASTER)
2654 link_mode |= HCI_LM_MASTER;
2655
2656 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2657 link_mode |= HCI_LM_ENCRYPT;
2658
2659 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2660 link_mode |= HCI_LM_AUTH;
2661
2662 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2663 link_mode |= HCI_LM_SECURE;
2664
2665 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2666 link_mode |= HCI_LM_FIPS;
2667
2668 return link_mode;
2669 }
2670
hci_get_conn_list(void __user * arg)2671 int hci_get_conn_list(void __user *arg)
2672 {
2673 struct hci_conn *c;
2674 struct hci_conn_list_req req, *cl;
2675 struct hci_conn_info *ci;
2676 struct hci_dev *hdev;
2677 int n = 0, size, err;
2678
2679 if (copy_from_user(&req, arg, sizeof(req)))
2680 return -EFAULT;
2681
2682 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2683 return -EINVAL;
2684
2685 size = sizeof(req) + req.conn_num * sizeof(*ci);
2686
2687 cl = kmalloc(size, GFP_KERNEL);
2688 if (!cl)
2689 return -ENOMEM;
2690
2691 hdev = hci_dev_get(req.dev_id);
2692 if (!hdev) {
2693 kfree(cl);
2694 return -ENODEV;
2695 }
2696
2697 ci = cl->conn_info;
2698
2699 hci_dev_lock(hdev);
2700 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2701 bacpy(&(ci + n)->bdaddr, &c->dst);
2702 (ci + n)->handle = c->handle;
2703 (ci + n)->type = c->type;
2704 (ci + n)->out = c->out;
2705 (ci + n)->state = c->state;
2706 (ci + n)->link_mode = get_link_mode(c);
2707 if (++n >= req.conn_num)
2708 break;
2709 }
2710 hci_dev_unlock(hdev);
2711
2712 cl->dev_id = hdev->id;
2713 cl->conn_num = n;
2714 size = sizeof(req) + n * sizeof(*ci);
2715
2716 hci_dev_put(hdev);
2717
2718 err = copy_to_user(arg, cl, size);
2719 kfree(cl);
2720
2721 return err ? -EFAULT : 0;
2722 }
2723
hci_get_conn_info(struct hci_dev * hdev,void __user * arg)2724 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2725 {
2726 struct hci_conn_info_req req;
2727 struct hci_conn_info ci;
2728 struct hci_conn *conn;
2729 char __user *ptr = arg + sizeof(req);
2730
2731 if (copy_from_user(&req, arg, sizeof(req)))
2732 return -EFAULT;
2733
2734 hci_dev_lock(hdev);
2735 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2736 if (conn) {
2737 bacpy(&ci.bdaddr, &conn->dst);
2738 ci.handle = conn->handle;
2739 ci.type = conn->type;
2740 ci.out = conn->out;
2741 ci.state = conn->state;
2742 ci.link_mode = get_link_mode(conn);
2743 }
2744 hci_dev_unlock(hdev);
2745
2746 if (!conn)
2747 return -ENOENT;
2748
2749 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2750 }
2751
hci_get_auth_info(struct hci_dev * hdev,void __user * arg)2752 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2753 {
2754 struct hci_auth_info_req req;
2755 struct hci_conn *conn;
2756
2757 if (copy_from_user(&req, arg, sizeof(req)))
2758 return -EFAULT;
2759
2760 hci_dev_lock(hdev);
2761 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2762 if (conn)
2763 req.type = conn->auth_type;
2764 hci_dev_unlock(hdev);
2765
2766 if (!conn)
2767 return -ENOENT;
2768
2769 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2770 }
2771
hci_chan_create(struct hci_conn * conn)2772 struct hci_chan *hci_chan_create(struct hci_conn *conn)
2773 {
2774 struct hci_dev *hdev = conn->hdev;
2775 struct hci_chan *chan;
2776
2777 BT_DBG("%s hcon %p", hdev->name, conn);
2778
2779 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2780 BT_DBG("Refusing to create new hci_chan");
2781 return NULL;
2782 }
2783
2784 chan = kzalloc_obj(*chan);
2785 if (!chan)
2786 return NULL;
2787
2788 chan->conn = hci_conn_get(conn);
2789 skb_queue_head_init(&chan->data_q);
2790 chan->state = BT_CONNECTED;
2791
2792 list_add_rcu(&chan->list, &conn->chan_list);
2793
2794 return chan;
2795 }
2796
hci_chan_del(struct hci_chan * chan)2797 void hci_chan_del(struct hci_chan *chan)
2798 {
2799 struct hci_conn *conn = chan->conn;
2800 struct hci_dev *hdev = conn->hdev;
2801
2802 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2803
2804 list_del_rcu(&chan->list);
2805
2806 synchronize_rcu();
2807
2808 /* Prevent new hci_chan's to be created for this hci_conn */
2809 set_bit(HCI_CONN_DROP, &conn->flags);
2810
2811 hci_conn_put(conn);
2812
2813 skb_queue_purge(&chan->data_q);
2814 kfree(chan);
2815 }
2816
hci_chan_list_flush(struct hci_conn * conn)2817 void hci_chan_list_flush(struct hci_conn *conn)
2818 {
2819 struct hci_chan *chan, *n;
2820
2821 BT_DBG("hcon %p", conn);
2822
2823 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2824 hci_chan_del(chan);
2825 }
2826
__hci_chan_lookup_handle(struct hci_conn * hcon,__u16 handle)2827 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2828 __u16 handle)
2829 {
2830 struct hci_chan *hchan;
2831
2832 list_for_each_entry(hchan, &hcon->chan_list, list) {
2833 if (hchan->handle == handle)
2834 return hchan;
2835 }
2836
2837 return NULL;
2838 }
2839
hci_chan_lookup_handle(struct hci_dev * hdev,__u16 handle)2840 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2841 {
2842 struct hci_conn_hash *h = &hdev->conn_hash;
2843 struct hci_conn *hcon;
2844 struct hci_chan *hchan = NULL;
2845
2846 rcu_read_lock();
2847
2848 list_for_each_entry_rcu(hcon, &h->list, list) {
2849 hchan = __hci_chan_lookup_handle(hcon, handle);
2850 if (hchan)
2851 break;
2852 }
2853
2854 rcu_read_unlock();
2855
2856 return hchan;
2857 }
2858
hci_conn_get_phy(struct hci_conn * conn)2859 u32 hci_conn_get_phy(struct hci_conn *conn)
2860 {
2861 u32 phys = 0;
2862
2863 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2864 * Table 6.2: Packets defined for synchronous, asynchronous, and
2865 * CPB logical transport types.
2866 */
2867 switch (conn->type) {
2868 case SCO_LINK:
2869 /* SCO logical transport (1 Mb/s):
2870 * HV1, HV2, HV3 and DV.
2871 */
2872 phys |= BT_PHY_BR_1M_1SLOT;
2873
2874 break;
2875
2876 case ACL_LINK:
2877 /* ACL logical transport (1 Mb/s) ptt=0:
2878 * DH1, DM3, DH3, DM5 and DH5.
2879 */
2880 phys |= BT_PHY_BR_1M_1SLOT;
2881
2882 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2883 phys |= BT_PHY_BR_1M_3SLOT;
2884
2885 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2886 phys |= BT_PHY_BR_1M_5SLOT;
2887
2888 /* ACL logical transport (2 Mb/s) ptt=1:
2889 * 2-DH1, 2-DH3 and 2-DH5.
2890 */
2891 if (!(conn->pkt_type & HCI_2DH1))
2892 phys |= BT_PHY_EDR_2M_1SLOT;
2893
2894 if (!(conn->pkt_type & HCI_2DH3))
2895 phys |= BT_PHY_EDR_2M_3SLOT;
2896
2897 if (!(conn->pkt_type & HCI_2DH5))
2898 phys |= BT_PHY_EDR_2M_5SLOT;
2899
2900 /* ACL logical transport (3 Mb/s) ptt=1:
2901 * 3-DH1, 3-DH3 and 3-DH5.
2902 */
2903 if (!(conn->pkt_type & HCI_3DH1))
2904 phys |= BT_PHY_EDR_3M_1SLOT;
2905
2906 if (!(conn->pkt_type & HCI_3DH3))
2907 phys |= BT_PHY_EDR_3M_3SLOT;
2908
2909 if (!(conn->pkt_type & HCI_3DH5))
2910 phys |= BT_PHY_EDR_3M_5SLOT;
2911
2912 break;
2913
2914 case ESCO_LINK:
2915 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2916 phys |= BT_PHY_BR_1M_1SLOT;
2917
2918 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2919 phys |= BT_PHY_BR_1M_3SLOT;
2920
2921 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2922 if (!(conn->pkt_type & ESCO_2EV3))
2923 phys |= BT_PHY_EDR_2M_1SLOT;
2924
2925 if (!(conn->pkt_type & ESCO_2EV5))
2926 phys |= BT_PHY_EDR_2M_3SLOT;
2927
2928 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2929 if (!(conn->pkt_type & ESCO_3EV3))
2930 phys |= BT_PHY_EDR_3M_1SLOT;
2931
2932 if (!(conn->pkt_type & ESCO_3EV5))
2933 phys |= BT_PHY_EDR_3M_3SLOT;
2934
2935 break;
2936
2937 case LE_LINK:
2938 if (conn->le_tx_def_phys & HCI_LE_SET_PHY_1M)
2939 phys |= BT_PHY_LE_1M_TX;
2940
2941 if (conn->le_rx_def_phys & HCI_LE_SET_PHY_1M)
2942 phys |= BT_PHY_LE_1M_RX;
2943
2944 if (conn->le_tx_def_phys & HCI_LE_SET_PHY_2M)
2945 phys |= BT_PHY_LE_2M_TX;
2946
2947 if (conn->le_rx_def_phys & HCI_LE_SET_PHY_2M)
2948 phys |= BT_PHY_LE_2M_RX;
2949
2950 if (conn->le_tx_def_phys & HCI_LE_SET_PHY_CODED)
2951 phys |= BT_PHY_LE_CODED_TX;
2952
2953 if (conn->le_rx_def_phys & HCI_LE_SET_PHY_CODED)
2954 phys |= BT_PHY_LE_CODED_RX;
2955
2956 break;
2957 }
2958
2959 return phys;
2960 }
2961
bt_phy_pkt_type(struct hci_conn * conn,u32 phys)2962 static u16 bt_phy_pkt_type(struct hci_conn *conn, u32 phys)
2963 {
2964 u16 pkt_type = conn->pkt_type;
2965
2966 if (phys & BT_PHY_BR_1M_3SLOT)
2967 pkt_type |= HCI_DM3 | HCI_DH3;
2968 else
2969 pkt_type &= ~(HCI_DM3 | HCI_DH3);
2970
2971 if (phys & BT_PHY_BR_1M_5SLOT)
2972 pkt_type |= HCI_DM5 | HCI_DH5;
2973 else
2974 pkt_type &= ~(HCI_DM5 | HCI_DH5);
2975
2976 if (phys & BT_PHY_EDR_2M_1SLOT)
2977 pkt_type &= ~HCI_2DH1;
2978 else
2979 pkt_type |= HCI_2DH1;
2980
2981 if (phys & BT_PHY_EDR_2M_3SLOT)
2982 pkt_type &= ~HCI_2DH3;
2983 else
2984 pkt_type |= HCI_2DH3;
2985
2986 if (phys & BT_PHY_EDR_2M_5SLOT)
2987 pkt_type &= ~HCI_2DH5;
2988 else
2989 pkt_type |= HCI_2DH5;
2990
2991 if (phys & BT_PHY_EDR_3M_1SLOT)
2992 pkt_type &= ~HCI_3DH1;
2993 else
2994 pkt_type |= HCI_3DH1;
2995
2996 if (phys & BT_PHY_EDR_3M_3SLOT)
2997 pkt_type &= ~HCI_3DH3;
2998 else
2999 pkt_type |= HCI_3DH3;
3000
3001 if (phys & BT_PHY_EDR_3M_5SLOT)
3002 pkt_type &= ~HCI_3DH5;
3003 else
3004 pkt_type |= HCI_3DH5;
3005
3006 return pkt_type;
3007 }
3008
bt_phy_le_phy(u32 phys,u8 * tx_phys,u8 * rx_phys)3009 static int bt_phy_le_phy(u32 phys, u8 *tx_phys, u8 *rx_phys)
3010 {
3011 if (!tx_phys || !rx_phys)
3012 return -EINVAL;
3013
3014 *tx_phys = 0;
3015 *rx_phys = 0;
3016
3017 if (phys & BT_PHY_LE_1M_TX)
3018 *tx_phys |= HCI_LE_SET_PHY_1M;
3019
3020 if (phys & BT_PHY_LE_1M_RX)
3021 *rx_phys |= HCI_LE_SET_PHY_1M;
3022
3023 if (phys & BT_PHY_LE_2M_TX)
3024 *tx_phys |= HCI_LE_SET_PHY_2M;
3025
3026 if (phys & BT_PHY_LE_2M_RX)
3027 *rx_phys |= HCI_LE_SET_PHY_2M;
3028
3029 if (phys & BT_PHY_LE_CODED_TX)
3030 *tx_phys |= HCI_LE_SET_PHY_CODED;
3031
3032 if (phys & BT_PHY_LE_CODED_RX)
3033 *rx_phys |= HCI_LE_SET_PHY_CODED;
3034
3035 return 0;
3036 }
3037
hci_conn_set_phy(struct hci_conn * conn,u32 phys)3038 int hci_conn_set_phy(struct hci_conn *conn, u32 phys)
3039 {
3040 u8 tx_phys, rx_phys;
3041
3042 switch (conn->type) {
3043 case SCO_LINK:
3044 case ESCO_LINK:
3045 return -EINVAL;
3046 case ACL_LINK:
3047 /* Only allow setting BR/EDR PHYs if link type is ACL */
3048 if (phys & ~BT_PHY_BREDR_MASK)
3049 return -EINVAL;
3050
3051 return hci_acl_change_pkt_type(conn,
3052 bt_phy_pkt_type(conn, phys));
3053 case LE_LINK:
3054 /* Only allow setting LE PHYs if link type is LE */
3055 if (phys & ~BT_PHY_LE_MASK)
3056 return -EINVAL;
3057
3058 if (bt_phy_le_phy(phys, &tx_phys, &rx_phys))
3059 return -EINVAL;
3060
3061 return hci_le_set_phy(conn, tx_phys, rx_phys);
3062 default:
3063 return -EINVAL;
3064 }
3065 }
3066
abort_conn_sync(struct hci_dev * hdev,void * data)3067 static int abort_conn_sync(struct hci_dev *hdev, void *data)
3068 {
3069 struct hci_conn *conn = data;
3070
3071 if (!hci_conn_valid(hdev, conn))
3072 return -ECANCELED;
3073
3074 return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
3075 }
3076
hci_abort_conn(struct hci_conn * conn,u8 reason)3077 int hci_abort_conn(struct hci_conn *conn, u8 reason)
3078 {
3079 struct hci_dev *hdev = conn->hdev;
3080
3081 /* If abort_reason has already been set it means the connection is
3082 * already being aborted so don't attempt to overwrite it.
3083 */
3084 if (conn->abort_reason)
3085 return 0;
3086
3087 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
3088
3089 conn->abort_reason = reason;
3090
3091 /* If the connection is pending check the command opcode since that
3092 * might be blocking on hci_cmd_sync_work while waiting its respective
3093 * event so we need to hci_cmd_sync_cancel to cancel it.
3094 *
3095 * hci_connect_le serializes the connection attempts so only one
3096 * connection can be in BT_CONNECT at time.
3097 */
3098 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
3099 switch (hci_skb_event(hdev->sent_cmd)) {
3100 case HCI_EV_CONN_COMPLETE:
3101 case HCI_EV_LE_CONN_COMPLETE:
3102 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
3103 case HCI_EVT_LE_CIS_ESTABLISHED:
3104 hci_cmd_sync_cancel(hdev, ECANCELED);
3105 break;
3106 }
3107 /* Cancel connect attempt if still queued/pending */
3108 } else if (!hci_cancel_connect_sync(hdev, conn)) {
3109 return 0;
3110 }
3111
3112 /* Run immediately if on cmd_sync_work since this may be called
3113 * as a result to MGMT_OP_DISCONNECT/MGMT_OP_UNPAIR which does
3114 * already queue its callback on cmd_sync_work.
3115 */
3116 return hci_cmd_sync_run_once(hdev, abort_conn_sync, conn, NULL);
3117 }
3118
hci_setup_tx_timestamp(struct sk_buff * skb,size_t key_offset,const struct sockcm_cookie * sockc)3119 void hci_setup_tx_timestamp(struct sk_buff *skb, size_t key_offset,
3120 const struct sockcm_cookie *sockc)
3121 {
3122 struct sock *sk = skb ? skb->sk : NULL;
3123 int key;
3124
3125 /* This shall be called on a single skb of those generated by user
3126 * sendmsg(), and only when the sendmsg() does not return error to
3127 * user. This is required for keeping the tskey that increments here in
3128 * sync with possible sendmsg() counting by user.
3129 *
3130 * Stream sockets shall set key_offset to sendmsg() length in bytes
3131 * and call with the last fragment, others to 1 and first fragment.
3132 */
3133
3134 if (!skb || !sockc || !sk || !key_offset)
3135 return;
3136
3137 sock_tx_timestamp(sk, sockc, &skb_shinfo(skb)->tx_flags);
3138
3139 if (sk->sk_type == SOCK_STREAM)
3140 key = atomic_add_return(key_offset, &sk->sk_tskey);
3141
3142 if (sockc->tsflags & SOF_TIMESTAMPING_OPT_ID &&
3143 sockc->tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) {
3144 if (sockc->tsflags & SOCKCM_FLAG_TS_OPT_ID) {
3145 skb_shinfo(skb)->tskey = sockc->ts_opt_id;
3146 } else {
3147 if (sk->sk_type != SOCK_STREAM)
3148 key = atomic_inc_return(&sk->sk_tskey);
3149 skb_shinfo(skb)->tskey = key - 1;
3150 }
3151 }
3152 }
3153
hci_conn_tx_queue(struct hci_conn * conn,struct sk_buff * skb)3154 void hci_conn_tx_queue(struct hci_conn *conn, struct sk_buff *skb)
3155 {
3156 struct tx_queue *comp = &conn->tx_q;
3157 bool track = false;
3158
3159 /* Emit SND now, ie. just before sending to driver */
3160 if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP)
3161 __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SND);
3162
3163 /* COMPLETION tstamp is emitted for tracked skb later in Number of
3164 * Completed Packets event. Available only for flow controlled cases.
3165 *
3166 * TODO: SCO support without flowctl (needs to be done in drivers)
3167 */
3168 switch (conn->type) {
3169 case CIS_LINK:
3170 case BIS_LINK:
3171 case PA_LINK:
3172 case ACL_LINK:
3173 case LE_LINK:
3174 break;
3175 case SCO_LINK:
3176 case ESCO_LINK:
3177 if (!hci_dev_test_flag(conn->hdev, HCI_SCO_FLOWCTL))
3178 return;
3179 break;
3180 default:
3181 return;
3182 }
3183
3184 if (skb->sk && (skb_shinfo(skb)->tx_flags & SKBTX_COMPLETION_TSTAMP))
3185 track = true;
3186
3187 /* If nothing is tracked, just count extra skbs at the queue head */
3188 if (!track && !comp->tracked) {
3189 comp->extra++;
3190 return;
3191 }
3192
3193 if (track) {
3194 skb = skb_clone_sk(skb);
3195 if (!skb)
3196 goto count_only;
3197
3198 comp->tracked++;
3199 } else {
3200 skb = skb_clone(skb, GFP_KERNEL);
3201 if (!skb)
3202 goto count_only;
3203 }
3204
3205 skb_queue_tail(&comp->queue, skb);
3206 return;
3207
3208 count_only:
3209 /* Stop tracking skbs, and only count. This will not emit timestamps for
3210 * the packets, but if we get here something is more seriously wrong.
3211 */
3212 comp->tracked = 0;
3213 comp->extra += skb_queue_len(&comp->queue) + 1;
3214 skb_queue_purge(&comp->queue);
3215 }
3216
hci_conn_tx_dequeue(struct hci_conn * conn)3217 void hci_conn_tx_dequeue(struct hci_conn *conn)
3218 {
3219 struct tx_queue *comp = &conn->tx_q;
3220 struct sk_buff *skb;
3221
3222 /* If there are tracked skbs, the counted extra go before dequeuing real
3223 * skbs, to keep ordering. When nothing is tracked, the ordering doesn't
3224 * matter so dequeue real skbs first to get rid of them ASAP.
3225 */
3226 if (comp->extra && (comp->tracked || skb_queue_empty(&comp->queue))) {
3227 comp->extra--;
3228 return;
3229 }
3230
3231 skb = skb_dequeue(&comp->queue);
3232 if (!skb)
3233 return;
3234
3235 if (skb->sk) {
3236 comp->tracked--;
3237 __skb_tstamp_tx(skb, NULL, NULL, skb->sk,
3238 SCM_TSTAMP_COMPLETION);
3239 }
3240
3241 kfree_skb(skb);
3242 }
3243
hci_conn_key_enc_size(struct hci_conn * conn)3244 u8 *hci_conn_key_enc_size(struct hci_conn *conn)
3245 {
3246 if (conn->type == ACL_LINK) {
3247 struct link_key *key;
3248
3249 key = hci_find_link_key(conn->hdev, &conn->dst);
3250 if (!key)
3251 return NULL;
3252
3253 return &key->pin_len;
3254 } else if (conn->type == LE_LINK) {
3255 struct smp_ltk *ltk;
3256
3257 ltk = hci_find_ltk(conn->hdev, &conn->dst, conn->dst_type,
3258 conn->role);
3259 if (!ltk)
3260 return NULL;
3261
3262 return <k->enc_size;
3263 }
3264
3265 return NULL;
3266 }
3267
hci_ethtool_ts_info(unsigned int index,int sk_proto,struct kernel_ethtool_ts_info * info)3268 int hci_ethtool_ts_info(unsigned int index, int sk_proto,
3269 struct kernel_ethtool_ts_info *info)
3270 {
3271 struct hci_dev *hdev;
3272
3273 hdev = hci_dev_get(index);
3274 if (!hdev)
3275 return -ENODEV;
3276
3277 info->so_timestamping =
3278 SOF_TIMESTAMPING_RX_SOFTWARE |
3279 SOF_TIMESTAMPING_SOFTWARE;
3280 info->phc_index = -1;
3281 info->tx_types = BIT(HWTSTAMP_TX_OFF);
3282 info->rx_filters = BIT(HWTSTAMP_FILTER_NONE);
3283
3284 switch (sk_proto) {
3285 case BTPROTO_ISO:
3286 case BTPROTO_L2CAP:
3287 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
3288 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION;
3289 break;
3290 case BTPROTO_SCO:
3291 info->so_timestamping |= SOF_TIMESTAMPING_TX_SOFTWARE;
3292 if (hci_dev_test_flag(hdev, HCI_SCO_FLOWCTL))
3293 info->so_timestamping |= SOF_TIMESTAMPING_TX_COMPLETION;
3294 break;
3295 }
3296
3297 hci_dev_put(hdev);
3298 return 0;
3299 }
3300