1	/*
2	BlueZ - Bluetooth protocol stack for Linux
3	Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4	Copyright 2023 NXP
5
6	Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7
8	This program is free software; you can redistribute it and/or modify
9	it under the terms of the GNU General Public License version 2 as
10	published by the Free Software Foundation;
11
12	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
13	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
15	IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
16	CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
17	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19	OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20
21	ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
22	COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
23	SOFTWARE IS DISCLAIMED.
24	*/
25
26	/* Bluetooth HCI connection handling. */
27
28	#include <linux/export.h>
29	#include <linux/debugfs.h>
30
31	#include <net/bluetooth/bluetooth.h>
32	#include <net/bluetooth/hci_core.h>
33	#include <net/bluetooth/l2cap.h>
34	#include <net/bluetooth/iso.h>
35	#include <net/bluetooth/mgmt.h>
36
37	#include "hci_request.h"
38	#include "smp.h"
39	#include "a2mp.h"
40	#include "eir.h"
41
42	struct sco_param {
43	u16 pkt_type;
44	u16 max_latency;
45	u8 retrans_effort;
46	};
47
48	struct conn_handle_t {
49	struct hci_conn *conn;
50	__u16 handle;
51	};
52
53	static const struct sco_param esco_param_cvsd[] = {
54	{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
55	{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
56	{ EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
57	{ EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
58	{ EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
59	};
60
61	static const struct sco_param sco_param_cvsd[] = {
62	{ EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
63	{ EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
64	};
65
66	static const struct sco_param esco_param_msbc[] = {
67	{ EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
68	{ EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
69	};
70
71	/* This function requires the caller holds hdev->lock */
72	static void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
73	{
74	struct hci_conn_params *params;
75	struct hci_dev *hdev = conn->hdev;
76	struct smp_irk *irk;
77	bdaddr_t *bdaddr;
78	u8 bdaddr_type;
79
80	bdaddr = &conn->dst;
81	bdaddr_type = conn->dst_type;
82
83	/* Check if we need to convert to identity address */
84	irk = hci_get_irk(hdev, bdaddr, addr_type: bdaddr_type);
85	if (irk) {
86	bdaddr = &irk->bdaddr;
87	bdaddr_type = irk->addr_type;
88	}
89
90	params = hci_pend_le_action_lookup(list: &hdev->pend_le_conns, addr: bdaddr,
91	addr_type: bdaddr_type);
92	if (!params)
93	return;
94
95	if (params->conn) {
96	hci_conn_drop(conn: params->conn);
97	hci_conn_put(conn: params->conn);
98	params->conn = NULL;
99	}
100
101	if (!params->explicit_connect)
102	return;
103
104	/* If the status indicates successful cancellation of
105	* the attempt (i.e. Unknown Connection Id) there's no point of
106	* notifying failure since we'll go back to keep trying to
107	* connect. The only exception is explicit connect requests
108	* where a timeout + cancel does indicate an actual failure.
109	*/
110	if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
111	mgmt_connect_failed(hdev, bdaddr: &conn->dst, link_type: conn->type,
112	addr_type: conn->dst_type, status);
113
114	/* The connection attempt was doing scan for new RPA, and is
115	* in scan phase. If params are not associated with any other
116	* autoconnect action, remove them completely. If they are, just unmark
117	* them as waiting for connection, by clearing explicit_connect field.
118	*/
119	params->explicit_connect = false;
120
121	hci_pend_le_list_del_init(param: params);
122
123	switch (params->auto_connect) {
124	case HCI_AUTO_CONN_EXPLICIT:
125	hci_conn_params_del(hdev, addr: bdaddr, addr_type: bdaddr_type);
126	/* return instead of break to avoid duplicate scan update */
127	return;
128	case HCI_AUTO_CONN_DIRECT:
129	case HCI_AUTO_CONN_ALWAYS:
130	hci_pend_le_list_add(param: params, list: &hdev->pend_le_conns);
131	break;
132	case HCI_AUTO_CONN_REPORT:
133	hci_pend_le_list_add(param: params, list: &hdev->pend_le_reports);
134	break;
135	default:
136	break;
137	}
138
139	hci_update_passive_scan(hdev);
140	}
141
142	static void hci_conn_cleanup(struct hci_conn *conn)
143	{
144	struct hci_dev *hdev = conn->hdev;
145
146	if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
147	hci_conn_params_del(hdev: conn->hdev, addr: &conn->dst, addr_type: conn->dst_type);
148
149	if (test_and_clear_bit(nr: HCI_CONN_FLUSH_KEY, addr: &conn->flags))
150	hci_remove_link_key(hdev, bdaddr: &conn->dst);
151
152	hci_chan_list_flush(conn);
153
154	hci_conn_hash_del(hdev, c: conn);
155
156	if (HCI_CONN_HANDLE_UNSET(conn->handle))
157	ida_free(&hdev->unset_handle_ida, id: conn->handle);
158
159	if (conn->cleanup)
160	conn->cleanup(conn);
161
162	if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
163	switch (conn->setting & SCO_AIRMODE_MASK) {
164	case SCO_AIRMODE_CVSD:
165	case SCO_AIRMODE_TRANSP:
166	if (hdev->notify)
167	hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
168	break;
169	}
170	} else {
171	if (hdev->notify)
172	hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
173	}
174
175	debugfs_remove_recursive(dentry: conn->debugfs);
176
177	hci_conn_del_sysfs(conn);
178
179	hci_dev_put(d: hdev);
180	}
181
182	static void hci_acl_create_connection(struct hci_conn *conn)
183	{
184	struct hci_dev *hdev = conn->hdev;
185	struct inquiry_entry *ie;
186	struct hci_cp_create_conn cp;
187
188	BT_DBG("hcon %p", conn);
189
190	/* Many controllers disallow HCI Create Connection while it is doing
191	* HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
192	* Connection. This may cause the MGMT discovering state to become false
193	* without user space's request but it is okay since the MGMT Discovery
194	* APIs do not promise that discovery should be done forever. Instead,
195	* the user space monitors the status of MGMT discovering and it may
196	* request for discovery again when this flag becomes false.
197	*/
198	if (test_bit(HCI_INQUIRY, &hdev->flags)) {
199	/* Put this connection to "pending" state so that it will be
200	* executed after the inquiry cancel command complete event.
201	*/
202	conn->state = BT_CONNECT2;
203	hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, plen: 0, NULL);
204	return;
205	}
206
207	conn->state = BT_CONNECT;
208	conn->out = true;
209	conn->role = HCI_ROLE_MASTER;
210
211	conn->attempt++;
212
213	conn->link_policy = hdev->link_policy;
214
215	memset(&cp, 0, sizeof(cp));
216	bacpy(dst: &cp.bdaddr, src: &conn->dst);
217	cp.pscan_rep_mode = 0x02;
218
219	ie = hci_inquiry_cache_lookup(hdev, bdaddr: &conn->dst);
220	if (ie) {
221	if (inquiry_entry_age(e: ie) <= INQUIRY_ENTRY_AGE_MAX) {
222	cp.pscan_rep_mode = ie->data.pscan_rep_mode;
223	cp.pscan_mode = ie->data.pscan_mode;
224	cp.clock_offset = ie->data.clock_offset |
225	cpu_to_le16(0x8000);
226	}
227
228	memcpy(conn->dev_class, ie->data.dev_class, 3);
229	}
230
231	cp.pkt_type = cpu_to_le16(conn->pkt_type);
232	if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
233	cp.role_switch = 0x01;
234	else
235	cp.role_switch = 0x00;
236
237	hci_send_cmd(hdev, HCI_OP_CREATE_CONN, plen: sizeof(cp), param: &cp);
238	}
239
240	int hci_disconnect(struct hci_conn *conn, __u8 reason)
241	{
242	BT_DBG("hcon %p", conn);
243
244	/* When we are central of an established connection and it enters
245	* the disconnect timeout, then go ahead and try to read the
246	* current clock offset. Processing of the result is done
247	* within the event handling and hci_clock_offset_evt function.
248	*/
249	if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
250	(conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
251	struct hci_dev *hdev = conn->hdev;
252	struct hci_cp_read_clock_offset clkoff_cp;
253
254	clkoff_cp.handle = cpu_to_le16(conn->handle);
255	hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, plen: sizeof(clkoff_cp),
256	param: &clkoff_cp);
257	}
258
259	return hci_abort_conn(conn, reason);
260	}
261
262	static void hci_add_sco(struct hci_conn *conn, __u16 handle)
263	{
264	struct hci_dev *hdev = conn->hdev;
265	struct hci_cp_add_sco cp;
266
267	BT_DBG("hcon %p", conn);
268
269	conn->state = BT_CONNECT;
270	conn->out = true;
271
272	conn->attempt++;
273
274	cp.handle = cpu_to_le16(handle);
275	cp.pkt_type = cpu_to_le16(conn->pkt_type);
276
277	hci_send_cmd(hdev, HCI_OP_ADD_SCO, plen: sizeof(cp), param: &cp);
278	}
279
280	static bool find_next_esco_param(struct hci_conn *conn,
281	const struct sco_param *esco_param, int size)
282	{
283	if (!conn->parent)
284	return false;
285
286	for (; conn->attempt <= size; conn->attempt++) {
287	if (lmp_esco_2m_capable(conn->parent) ||
288	(esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
289	break;
290	BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
291	conn, conn->attempt);
292	}
293
294	return conn->attempt <= size;
295	}
296
297	static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
298	{
299	int err;
300	__u8 vnd_len, *vnd_data = NULL;
301	struct hci_op_configure_data_path *cmd = NULL;
302
303	err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
304	&vnd_data);
305	if (err < 0)
306	goto error;
307
308	cmd = kzalloc(size: sizeof(*cmd) + vnd_len, GFP_KERNEL);
309	if (!cmd) {
310	err = -ENOMEM;
311	goto error;
312	}
313
314	err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
315	if (err < 0)
316	goto error;
317
318	cmd->vnd_len = vnd_len;
319	memcpy(cmd->vnd_data, vnd_data, vnd_len);
320
321	cmd->direction = 0x00;
322	__hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
323	plen: sizeof(*cmd) + vnd_len, param: cmd, HCI_CMD_TIMEOUT);
324
325	cmd->direction = 0x01;
326	err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
327	plen: sizeof(*cmd) + vnd_len, param: cmd,
328	HCI_CMD_TIMEOUT);
329	error:
330
331	kfree(objp: cmd);
332	kfree(objp: vnd_data);
333	return err;
334	}
335
336	static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
337	{
338	struct conn_handle_t *conn_handle = data;
339	struct hci_conn *conn = conn_handle->conn;
340	__u16 handle = conn_handle->handle;
341	struct hci_cp_enhanced_setup_sync_conn cp;
342	const struct sco_param *param;
343
344	kfree(objp: conn_handle);
345
346	bt_dev_dbg(hdev, "hcon %p", conn);
347
348	/* for offload use case, codec needs to configured before opening SCO */
349	if (conn->codec.data_path)
350	configure_datapath_sync(hdev, codec: &conn->codec);
351
352	conn->state = BT_CONNECT;
353	conn->out = true;
354
355	conn->attempt++;
356
357	memset(&cp, 0x00, sizeof(cp));
358
359	cp.handle = cpu_to_le16(handle);
360
361	cp.tx_bandwidth = cpu_to_le32(0x00001f40);
362	cp.rx_bandwidth = cpu_to_le32(0x00001f40);
363
364	switch (conn->codec.id) {
365	case BT_CODEC_MSBC:
366	if (!find_next_esco_param(conn, esco_param: esco_param_msbc,
367	ARRAY_SIZE(esco_param_msbc)))
368	return -EINVAL;
369
370	param = &esco_param_msbc[conn->attempt - 1];
371	cp.tx_coding_format.id = 0x05;
372	cp.rx_coding_format.id = 0x05;
373	cp.tx_codec_frame_size = __cpu_to_le16(60);
374	cp.rx_codec_frame_size = __cpu_to_le16(60);
375	cp.in_bandwidth = __cpu_to_le32(32000);
376	cp.out_bandwidth = __cpu_to_le32(32000);
377	cp.in_coding_format.id = 0x04;
378	cp.out_coding_format.id = 0x04;
379	cp.in_coded_data_size = __cpu_to_le16(16);
380	cp.out_coded_data_size = __cpu_to_le16(16);
381	cp.in_pcm_data_format = 2;
382	cp.out_pcm_data_format = 2;
383	cp.in_pcm_sample_payload_msb_pos = 0;
384	cp.out_pcm_sample_payload_msb_pos = 0;
385	cp.in_data_path = conn->codec.data_path;
386	cp.out_data_path = conn->codec.data_path;
387	cp.in_transport_unit_size = 1;
388	cp.out_transport_unit_size = 1;
389	break;
390
391	case BT_CODEC_TRANSPARENT:
392	if (!find_next_esco_param(conn, esco_param: esco_param_msbc,
393	ARRAY_SIZE(esco_param_msbc)))
394	return false;
395	param = &esco_param_msbc[conn->attempt - 1];
396	cp.tx_coding_format.id = 0x03;
397	cp.rx_coding_format.id = 0x03;
398	cp.tx_codec_frame_size = __cpu_to_le16(60);
399	cp.rx_codec_frame_size = __cpu_to_le16(60);
400	cp.in_bandwidth = __cpu_to_le32(0x1f40);
401	cp.out_bandwidth = __cpu_to_le32(0x1f40);
402	cp.in_coding_format.id = 0x03;
403	cp.out_coding_format.id = 0x03;
404	cp.in_coded_data_size = __cpu_to_le16(16);
405	cp.out_coded_data_size = __cpu_to_le16(16);
406	cp.in_pcm_data_format = 2;
407	cp.out_pcm_data_format = 2;
408	cp.in_pcm_sample_payload_msb_pos = 0;
409	cp.out_pcm_sample_payload_msb_pos = 0;
410	cp.in_data_path = conn->codec.data_path;
411	cp.out_data_path = conn->codec.data_path;
412	cp.in_transport_unit_size = 1;
413	cp.out_transport_unit_size = 1;
414	break;
415
416	case BT_CODEC_CVSD:
417	if (conn->parent && lmp_esco_capable(conn->parent)) {
418	if (!find_next_esco_param(conn, esco_param: esco_param_cvsd,
419	ARRAY_SIZE(esco_param_cvsd)))
420	return -EINVAL;
421	param = &esco_param_cvsd[conn->attempt - 1];
422	} else {
423	if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
424	return -EINVAL;
425	param = &sco_param_cvsd[conn->attempt - 1];
426	}
427	cp.tx_coding_format.id = 2;
428	cp.rx_coding_format.id = 2;
429	cp.tx_codec_frame_size = __cpu_to_le16(60);
430	cp.rx_codec_frame_size = __cpu_to_le16(60);
431	cp.in_bandwidth = __cpu_to_le32(16000);
432	cp.out_bandwidth = __cpu_to_le32(16000);
433	cp.in_coding_format.id = 4;
434	cp.out_coding_format.id = 4;
435	cp.in_coded_data_size = __cpu_to_le16(16);
436	cp.out_coded_data_size = __cpu_to_le16(16);
437	cp.in_pcm_data_format = 2;
438	cp.out_pcm_data_format = 2;
439	cp.in_pcm_sample_payload_msb_pos = 0;
440	cp.out_pcm_sample_payload_msb_pos = 0;
441	cp.in_data_path = conn->codec.data_path;
442	cp.out_data_path = conn->codec.data_path;
443	cp.in_transport_unit_size = 16;
444	cp.out_transport_unit_size = 16;
445	break;
446	default:
447	return -EINVAL;
448	}
449
450	cp.retrans_effort = param->retrans_effort;
451	cp.pkt_type = __cpu_to_le16(param->pkt_type);
452	cp.max_latency = __cpu_to_le16(param->max_latency);
453
454	if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, plen: sizeof(cp), param: &cp) < 0)
455	return -EIO;
456
457	return 0;
458	}
459
460	static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
461	{
462	struct hci_dev *hdev = conn->hdev;
463	struct hci_cp_setup_sync_conn cp;
464	const struct sco_param *param;
465
466	bt_dev_dbg(hdev, "hcon %p", conn);
467
468	conn->state = BT_CONNECT;
469	conn->out = true;
470
471	conn->attempt++;
472
473	cp.handle = cpu_to_le16(handle);
474
475	cp.tx_bandwidth = cpu_to_le32(0x00001f40);
476	cp.rx_bandwidth = cpu_to_le32(0x00001f40);
477	cp.voice_setting = cpu_to_le16(conn->setting);
478
479	switch (conn->setting & SCO_AIRMODE_MASK) {
480	case SCO_AIRMODE_TRANSP:
481	if (!find_next_esco_param(conn, esco_param: esco_param_msbc,
482	ARRAY_SIZE(esco_param_msbc)))
483	return false;
484	param = &esco_param_msbc[conn->attempt - 1];
485	break;
486	case SCO_AIRMODE_CVSD:
487	if (conn->parent && lmp_esco_capable(conn->parent)) {
488	if (!find_next_esco_param(conn, esco_param: esco_param_cvsd,
489	ARRAY_SIZE(esco_param_cvsd)))
490	return false;
491	param = &esco_param_cvsd[conn->attempt - 1];
492	} else {
493	if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
494	return false;
495	param = &sco_param_cvsd[conn->attempt - 1];
496	}
497	break;
498	default:
499	return false;
500	}
501
502	cp.retrans_effort = param->retrans_effort;
503	cp.pkt_type = __cpu_to_le16(param->pkt_type);
504	cp.max_latency = __cpu_to_le16(param->max_latency);
505
506	if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, plen: sizeof(cp), param: &cp) < 0)
507	return false;
508
509	return true;
510	}
511
512	bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
513	{
514	int result;
515	struct conn_handle_t *conn_handle;
516
517	if (enhanced_sync_conn_capable(conn->hdev)) {
518	conn_handle = kzalloc(size: sizeof(*conn_handle), GFP_KERNEL);
519
520	if (!conn_handle)
521	return false;
522
523	conn_handle->conn = conn;
524	conn_handle->handle = handle;
525	result = hci_cmd_sync_queue(hdev: conn->hdev, func: hci_enhanced_setup_sync,
526	data: conn_handle, NULL);
527	if (result < 0)
528	kfree(objp: conn_handle);
529
530	return result == 0;
531	}
532
533	return hci_setup_sync_conn(conn, handle);
534	}
535
536	u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
537	u16 to_multiplier)
538	{
539	struct hci_dev *hdev = conn->hdev;
540	struct hci_conn_params *params;
541	struct hci_cp_le_conn_update cp;
542
543	hci_dev_lock(hdev);
544
545	params = hci_conn_params_lookup(hdev, addr: &conn->dst, addr_type: conn->dst_type);
546	if (params) {
547	params->conn_min_interval = min;
548	params->conn_max_interval = max;
549	params->conn_latency = latency;
550	params->supervision_timeout = to_multiplier;
551	}
552
553	hci_dev_unlock(hdev);
554
555	memset(&cp, 0, sizeof(cp));
556	cp.handle = cpu_to_le16(conn->handle);
557	cp.conn_interval_min = cpu_to_le16(min);
558	cp.conn_interval_max = cpu_to_le16(max);
559	cp.conn_latency = cpu_to_le16(latency);
560	cp.supervision_timeout = cpu_to_le16(to_multiplier);
561	cp.min_ce_len = cpu_to_le16(0x0000);
562	cp.max_ce_len = cpu_to_le16(0x0000);
563
564	hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, plen: sizeof(cp), param: &cp);
565
566	if (params)
567	return 0x01;
568
569	return 0x00;
570	}
571
572	void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
573	__u8 ltk[16], __u8 key_size)
574	{
575	struct hci_dev *hdev = conn->hdev;
576	struct hci_cp_le_start_enc cp;
577
578	BT_DBG("hcon %p", conn);
579
580	memset(&cp, 0, sizeof(cp));
581
582	cp.handle = cpu_to_le16(conn->handle);
583	cp.rand = rand;
584	cp.ediv = ediv;
585	memcpy(cp.ltk, ltk, key_size);
586
587	hci_send_cmd(hdev, HCI_OP_LE_START_ENC, plen: sizeof(cp), param: &cp);
588	}
589
590	/* Device _must_ be locked */
591	void hci_sco_setup(struct hci_conn *conn, __u8 status)
592	{
593	struct hci_link *link;
594
595	link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
596	if (!link || !link->conn)
597	return;
598
599	BT_DBG("hcon %p", conn);
600
601	if (!status) {
602	if (lmp_esco_capable(conn->hdev))
603	hci_setup_sync(conn: link->conn, handle: conn->handle);
604	else
605	hci_add_sco(conn: link->conn, handle: conn->handle);
606	} else {
607	hci_connect_cfm(conn: link->conn, status);
608	hci_conn_del(conn: link->conn);
609	}
610	}
611
612	static void hci_conn_timeout(struct work_struct *work)
613	{
614	struct hci_conn *conn = container_of(work, struct hci_conn,
615	disc_work.work);
616	int refcnt = atomic_read(v: &conn->refcnt);
617
618	BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
619
620	WARN_ON(refcnt < 0);
621
622	/* FIXME: It was observed that in pairing failed scenario, refcnt
623	* drops below 0. Probably this is because l2cap_conn_del calls
624	* l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
625	* dropped. After that loop hci_chan_del is called which also drops
626	* conn. For now make sure that ACL is alive if refcnt is higher then 0,
627	* otherwise drop it.
628	*/
629	if (refcnt > 0)
630	return;
631
632	hci_abort_conn(conn, reason: hci_proto_disconn_ind(conn));
633	}
634
635	/* Enter sniff mode */
636	static void hci_conn_idle(struct work_struct *work)
637	{
638	struct hci_conn *conn = container_of(work, struct hci_conn,
639	idle_work.work);
640	struct hci_dev *hdev = conn->hdev;
641
642	BT_DBG("hcon %p mode %d", conn, conn->mode);
643
644	if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
645	return;
646
647	if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
648	return;
649
650	if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
651	struct hci_cp_sniff_subrate cp;
652	cp.handle = cpu_to_le16(conn->handle);
653	cp.max_latency = cpu_to_le16(0);
654	cp.min_remote_timeout = cpu_to_le16(0);
655	cp.min_local_timeout = cpu_to_le16(0);
656	hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, plen: sizeof(cp), param: &cp);
657	}
658
659	if (!test_and_set_bit(nr: HCI_CONN_MODE_CHANGE_PEND, addr: &conn->flags)) {
660	struct hci_cp_sniff_mode cp;
661	cp.handle = cpu_to_le16(conn->handle);
662	cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
663	cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
664	cp.attempt = cpu_to_le16(4);
665	cp.timeout = cpu_to_le16(1);
666	hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, plen: sizeof(cp), param: &cp);
667	}
668	}
669
670	static void hci_conn_auto_accept(struct work_struct *work)
671	{
672	struct hci_conn *conn = container_of(work, struct hci_conn,
673	auto_accept_work.work);
674
675	hci_send_cmd(hdev: conn->hdev, HCI_OP_USER_CONFIRM_REPLY, plen: sizeof(conn->dst),
676	param: &conn->dst);
677	}
678
679	static void le_disable_advertising(struct hci_dev *hdev)
680	{
681	if (ext_adv_capable(hdev)) {
682	struct hci_cp_le_set_ext_adv_enable cp;
683
684	cp.enable = 0x00;
685	cp.num_of_sets = 0x00;
686
687	hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, plen: sizeof(cp),
688	param: &cp);
689	} else {
690	u8 enable = 0x00;
691	hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, plen: sizeof(enable),
692	param: &enable);
693	}
694	}
695
696	static void le_conn_timeout(struct work_struct *work)
697	{
698	struct hci_conn *conn = container_of(work, struct hci_conn,
699	le_conn_timeout.work);
700	struct hci_dev *hdev = conn->hdev;
701
702	BT_DBG("");
703
704	/* We could end up here due to having done directed advertising,
705	* so clean up the state if necessary. This should however only
706	* happen with broken hardware or if low duty cycle was used
707	* (which doesn't have a timeout of its own).
708	*/
709	if (conn->role == HCI_ROLE_SLAVE) {
710	/* Disable LE Advertising */
711	le_disable_advertising(hdev);
712	hci_dev_lock(hdev);
713	hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
714	hci_dev_unlock(hdev);
715	return;
716	}
717
718	hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
719	}
720
721	struct iso_cig_params {
722	struct hci_cp_le_set_cig_params cp;
723	struct hci_cis_params cis[0x1f];
724	};
725
726	struct iso_list_data {
727	union {
728	u8 cig;
729	u8 big;
730	};
731	union {
732	u8 cis;
733	u8 bis;
734	u16 sync_handle;
735	};
736	int count;
737	bool big_term;
738	bool pa_sync_term;
739	bool big_sync_term;
740	};
741
742	static void bis_list(struct hci_conn *conn, void *data)
743	{
744	struct iso_list_data *d = data;
745
746	/* Skip if not broadcast/ANY address */
747	if (bacmp(ba1: &conn->dst, BDADDR_ANY))
748	return;
749
750	if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
751	d->bis != conn->iso_qos.bcast.bis)
752	return;
753
754	d->count++;
755	}
756
757	static int terminate_big_sync(struct hci_dev *hdev, void *data)
758	{
759	struct iso_list_data *d = data;
760
761	bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
762
763	hci_disable_per_advertising_sync(hdev, instance: d->bis);
764	hci_remove_ext_adv_instance_sync(hdev, instance: d->bis, NULL);
765
766	/* Only terminate BIG if it has been created */
767	if (!d->big_term)
768	return 0;
769
770	return hci_le_terminate_big_sync(hdev, handle: d->big,
771	HCI_ERROR_LOCAL_HOST_TERM);
772	}
773
774	static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
775	{
776	kfree(objp: data);
777	}
778
779	static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
780	{
781	struct iso_list_data *d;
782	int ret;
783
784	bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
785	conn->iso_qos.bcast.bis);
786
787	d = kzalloc(size: sizeof(*d), GFP_KERNEL);
788	if (!d)
789	return -ENOMEM;
790
791	d->big = conn->iso_qos.bcast.big;
792	d->bis = conn->iso_qos.bcast.bis;
793	d->big_term = test_and_clear_bit(nr: HCI_CONN_BIG_CREATED, addr: &conn->flags);
794
795	ret = hci_cmd_sync_queue(hdev, func: terminate_big_sync, data: d,
796	destroy: terminate_big_destroy);
797	if (ret)
798	kfree(objp: d);
799
800	return ret;
801	}
802
803	static int big_terminate_sync(struct hci_dev *hdev, void *data)
804	{
805	struct iso_list_data *d = data;
806
807	bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
808	d->sync_handle);
809
810	if (d->big_sync_term)
811	hci_le_big_terminate_sync(hdev, handle: d->big);
812
813	if (d->pa_sync_term)
814	return hci_le_pa_terminate_sync(hdev, handle: d->sync_handle);
815
816	return 0;
817	}
818
819	static void find_bis(struct hci_conn *conn, void *data)
820	{
821	struct iso_list_data *d = data;
822
823	/* Ignore if BIG doesn't match */
824	if (d->big != conn->iso_qos.bcast.big)
825	return;
826
827	d->count++;
828	}
829
830	static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
831	{
832	struct iso_list_data *d;
833	int ret;
834
835	bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
836
837	d = kzalloc(size: sizeof(*d), GFP_KERNEL);
838	if (!d)
839	return -ENOMEM;
840
841	memset(d, 0, sizeof(*d));
842	d->big = big;
843	d->sync_handle = conn->sync_handle;
844
845	if (test_and_clear_bit(nr: HCI_CONN_PA_SYNC, addr: &conn->flags)) {
846	hci_conn_hash_list_flag(hdev, func: find_bis, ISO_LINK,
847	flag: HCI_CONN_PA_SYNC, data: d);
848
849	if (!d->count)
850	d->pa_sync_term = true;
851
852	d->count = 0;
853	}
854
855	if (test_and_clear_bit(nr: HCI_CONN_BIG_SYNC, addr: &conn->flags)) {
856	hci_conn_hash_list_flag(hdev, func: find_bis, ISO_LINK,
857	flag: HCI_CONN_BIG_SYNC, data: d);
858
859	if (!d->count)
860	d->big_sync_term = true;
861	}
862
863	ret = hci_cmd_sync_queue(hdev, func: big_terminate_sync, data: d,
864	destroy: terminate_big_destroy);
865	if (ret)
866	kfree(objp: d);
867
868	return ret;
869	}
870
871	/* Cleanup BIS connection
872	*
873	* Detects if there any BIS left connected in a BIG
874	* broadcaster: Remove advertising instance and terminate BIG.
875	* broadcaster receiver: Teminate BIG sync and terminate PA sync.
876	*/
877	static void bis_cleanup(struct hci_conn *conn)
878	{
879	struct hci_dev *hdev = conn->hdev;
880	struct hci_conn *bis;
881
882	bt_dev_dbg(hdev, "conn %p", conn);
883
884	if (conn->role == HCI_ROLE_MASTER) {
885	if (!test_and_clear_bit(nr: HCI_CONN_PER_ADV, addr: &conn->flags))
886	return;
887
888	/* Check if ISO connection is a BIS and terminate advertising
889	* set and BIG if there are no other connections using it.
890	*/
891	bis = hci_conn_hash_lookup_big(hdev, handle: conn->iso_qos.bcast.big);
892	if (bis)
893	return;
894
895	hci_le_terminate_big(hdev, conn);
896	} else {
897	hci_le_big_terminate(hdev, big: conn->iso_qos.bcast.big,
898	conn);
899	}
900	}
901
902	static int remove_cig_sync(struct hci_dev *hdev, void *data)
903	{
904	u8 handle = PTR_UINT(data);
905
906	return hci_le_remove_cig_sync(hdev, handle);
907	}
908
909	static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
910	{
911	bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
912
913	return hci_cmd_sync_queue(hdev, func: remove_cig_sync, UINT_PTR(handle),
914	NULL);
915	}
916
917	static void find_cis(struct hci_conn *conn, void *data)
918	{
919	struct iso_list_data *d = data;
920
921	/* Ignore broadcast or if CIG don't match */
922	if (!bacmp(ba1: &conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
923	return;
924
925	d->count++;
926	}
927
928	/* Cleanup CIS connection:
929	*
930	* Detects if there any CIS left connected in a CIG and remove it.
931	*/
932	static void cis_cleanup(struct hci_conn *conn)
933	{
934	struct hci_dev *hdev = conn->hdev;
935	struct iso_list_data d;
936
937	if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
938	return;
939
940	memset(&d, 0, sizeof(d));
941	d.cig = conn->iso_qos.ucast.cig;
942
943	/* Check if ISO connection is a CIS and remove CIG if there are
944	* no other connections using it.
945	*/
946	hci_conn_hash_list_state(hdev, func: find_cis, ISO_LINK, state: BT_BOUND, data: &d);
947	hci_conn_hash_list_state(hdev, func: find_cis, ISO_LINK, state: BT_CONNECT, data: &d);
948	hci_conn_hash_list_state(hdev, func: find_cis, ISO_LINK, state: BT_CONNECTED, data: &d);
949	if (d.count)
950	return;
951
952	hci_le_remove_cig(hdev, handle: conn->iso_qos.ucast.cig);
953	}
954
955	static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
956	{
957	return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
958	U16_MAX, GFP_ATOMIC);
959	}
960
961	struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
962	u8 role, u16 handle)
963	{
964	struct hci_conn *conn;
965
966	bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
967
968	conn = kzalloc(size: sizeof(*conn), GFP_KERNEL);
969	if (!conn)
970	return NULL;
971
972	bacpy(dst: &conn->dst, src: dst);
973	bacpy(dst: &conn->src, src: &hdev->bdaddr);
974	conn->handle = handle;
975	conn->hdev = hdev;
976	conn->type = type;
977	conn->role = role;
978	conn->mode = HCI_CM_ACTIVE;
979	conn->state = BT_OPEN;
980	conn->auth_type = HCI_AT_GENERAL_BONDING;
981	conn->io_capability = hdev->io_capability;
982	conn->remote_auth = 0xff;
983	conn->key_type = 0xff;
984	conn->rssi = HCI_RSSI_INVALID;
985	conn->tx_power = HCI_TX_POWER_INVALID;
986	conn->max_tx_power = HCI_TX_POWER_INVALID;
987	conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
988
989	set_bit(nr: HCI_CONN_POWER_SAVE, addr: &conn->flags);
990	conn->disc_timeout = HCI_DISCONN_TIMEOUT;
991
992	/* Set Default Authenticated payload timeout to 30s */
993	conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
994
995	if (conn->role == HCI_ROLE_MASTER)
996	conn->out = true;
997
998	switch (type) {
999	case ACL_LINK:
1000	conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
1001	break;
1002	case LE_LINK:
1003	/* conn->src should reflect the local identity address */
1004	hci_copy_identity_address(hdev, bdaddr: &conn->src, bdaddr_type: &conn->src_type);
1005	break;
1006	case ISO_LINK:
1007	/* conn->src should reflect the local identity address */
1008	hci_copy_identity_address(hdev, bdaddr: &conn->src, bdaddr_type: &conn->src_type);
1009
1010	/* set proper cleanup function */
1011	if (!bacmp(ba1: dst, BDADDR_ANY))
1012	conn->cleanup = bis_cleanup;
1013	else if (conn->role == HCI_ROLE_MASTER)
1014	conn->cleanup = cis_cleanup;
1015
1016	break;
1017	case SCO_LINK:
1018	if (lmp_esco_capable(hdev))
1019	conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
1020	(hdev->esco_type & EDR_ESCO_MASK);
1021	else
1022	conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1023	break;
1024	case ESCO_LINK:
1025	conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1026	break;
1027	}
1028
1029	skb_queue_head_init(list: &conn->data_q);
1030
1031	INIT_LIST_HEAD(list: &conn->chan_list);
1032	INIT_LIST_HEAD(list: &conn->link_list);
1033
1034	INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1035	INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1036	INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1037	INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1038
1039	atomic_set(v: &conn->refcnt, i: 0);
1040
1041	hci_dev_hold(d: hdev);
1042
1043	hci_conn_hash_add(hdev, c: conn);
1044
1045	/* The SCO and eSCO connections will only be notified when their
1046	* setup has been completed. This is different to ACL links which
1047	* can be notified right away.
1048	*/
1049	if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1050	if (hdev->notify)
1051	hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1052	}
1053
1054	hci_conn_init_sysfs(conn);
1055
1056	return conn;
1057	}
1058
1059	struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1060	bdaddr_t *dst, u8 role)
1061	{
1062	int handle;
1063
1064	bt_dev_dbg(hdev, "dst %pMR", dst);
1065
1066	handle = hci_conn_hash_alloc_unset(hdev);
1067	if (unlikely(handle < 0))
1068	return NULL;
1069
1070	return hci_conn_add(hdev, type, dst, role, handle);
1071	}
1072
1073	static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1074	{
1075	if (!reason)
1076	reason = HCI_ERROR_REMOTE_USER_TERM;
1077
1078	/* Due to race, SCO/ISO conn might be not established yet at this point,
1079	* and nothing else will clean it up. In other cases it is done via HCI
1080	* events.
1081	*/
1082	switch (conn->type) {
1083	case SCO_LINK:
1084	case ESCO_LINK:
1085	if (HCI_CONN_HANDLE_UNSET(conn->handle))
1086	hci_conn_failed(conn, status: reason);
1087	break;
1088	case ISO_LINK:
1089	if (conn->state != BT_CONNECTED &&
1090	!test_bit(HCI_CONN_CREATE_CIS, &conn->flags))
1091	hci_conn_failed(conn, status: reason);
1092	break;
1093	}
1094	}
1095
1096	static void hci_conn_unlink(struct hci_conn *conn)
1097	{
1098	struct hci_dev *hdev = conn->hdev;
1099
1100	bt_dev_dbg(hdev, "hcon %p", conn);
1101
1102	if (!conn->parent) {
1103	struct hci_link *link, *t;
1104
1105	list_for_each_entry_safe(link, t, &conn->link_list, list) {
1106	struct hci_conn *child = link->conn;
1107
1108	hci_conn_unlink(conn: child);
1109
1110	/* If hdev is down it means
1111	* hci_dev_close_sync/hci_conn_hash_flush is in progress
1112	* and links don't need to be cleanup as all connections
1113	* would be cleanup.
1114	*/
1115	if (!test_bit(HCI_UP, &hdev->flags))
1116	continue;
1117
1118	hci_conn_cleanup_child(conn: child, reason: conn->abort_reason);
1119	}
1120
1121	return;
1122	}
1123
1124	if (!conn->link)
1125	return;
1126
1127	list_del_rcu(entry: &conn->link->list);
1128	synchronize_rcu();
1129
1130	hci_conn_drop(conn: conn->parent);
1131	hci_conn_put(conn: conn->parent);
1132	conn->parent = NULL;
1133
1134	kfree(objp: conn->link);
1135	conn->link = NULL;
1136	}
1137
1138	void hci_conn_del(struct hci_conn *conn)
1139	{
1140	struct hci_dev *hdev = conn->hdev;
1141
1142	BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1143
1144	hci_conn_unlink(conn);
1145
1146	cancel_delayed_work_sync(dwork: &conn->disc_work);
1147	cancel_delayed_work_sync(dwork: &conn->auto_accept_work);
1148	cancel_delayed_work_sync(dwork: &conn->idle_work);
1149
1150	if (conn->type == ACL_LINK) {
1151	/* Unacked frames */
1152	hdev->acl_cnt += conn->sent;
1153	} else if (conn->type == LE_LINK) {
1154	cancel_delayed_work(dwork: &conn->le_conn_timeout);
1155
1156	if (hdev->le_pkts)
1157	hdev->le_cnt += conn->sent;
1158	else
1159	hdev->acl_cnt += conn->sent;
1160	} else {
1161	/* Unacked ISO frames */
1162	if (conn->type == ISO_LINK) {
1163	if (hdev->iso_pkts)
1164	hdev->iso_cnt += conn->sent;
1165	else if (hdev->le_pkts)
1166	hdev->le_cnt += conn->sent;
1167	else
1168	hdev->acl_cnt += conn->sent;
1169	}
1170	}
1171
1172	if (conn->amp_mgr)
1173	amp_mgr_put(mgr: conn->amp_mgr);
1174
1175	skb_queue_purge(list: &conn->data_q);
1176
1177	/* Remove the connection from the list and cleanup its remaining
1178	* state. This is a separate function since for some cases like
1179	* BT_CONNECT_SCAN we *only* want the cleanup part without the
1180	* rest of hci_conn_del.
1181	*/
1182	hci_conn_cleanup(conn);
1183	}
1184
1185	struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1186	{
1187	int use_src = bacmp(ba1: src, BDADDR_ANY);
1188	struct hci_dev *hdev = NULL, *d;
1189
1190	BT_DBG("%pMR -> %pMR", src, dst);
1191
1192	read_lock(&hci_dev_list_lock);
1193
1194	list_for_each_entry(d, &hci_dev_list, list) {
1195	if (!test_bit(HCI_UP, &d->flags) ||
1196	hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
1197	d->dev_type != HCI_PRIMARY)
1198	continue;
1199
1200	/* Simple routing:
1201	* No source address - find interface with bdaddr != dst
1202	* Source address - find interface with bdaddr == src
1203	*/
1204
1205	if (use_src) {
1206	bdaddr_t id_addr;
1207	u8 id_addr_type;
1208
1209	if (src_type == BDADDR_BREDR) {
1210	if (!lmp_bredr_capable(d))
1211	continue;
1212	bacpy(dst: &id_addr, src: &d->bdaddr);
1213	id_addr_type = BDADDR_BREDR;
1214	} else {
1215	if (!lmp_le_capable(d))
1216	continue;
1217
1218	hci_copy_identity_address(hdev: d, bdaddr: &id_addr,
1219	bdaddr_type: &id_addr_type);
1220
1221	/* Convert from HCI to three-value type */
1222	if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1223	id_addr_type = BDADDR_LE_PUBLIC;
1224	else
1225	id_addr_type = BDADDR_LE_RANDOM;
1226	}
1227
1228	if (!bacmp(ba1: &id_addr, ba2: src) && id_addr_type == src_type) {
1229	hdev = d; break;
1230	}
1231	} else {
1232	if (bacmp(ba1: &d->bdaddr, ba2: dst)) {
1233	hdev = d; break;
1234	}
1235	}
1236	}
1237
1238	if (hdev)
1239	hdev = hci_dev_hold(d: hdev);
1240
1241	read_unlock(&hci_dev_list_lock);
1242	return hdev;
1243	}
1244	EXPORT_SYMBOL(hci_get_route);
1245
1246	/* This function requires the caller holds hdev->lock */
1247	static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1248	{
1249	struct hci_dev *hdev = conn->hdev;
1250
1251	hci_connect_le_scan_cleanup(conn, status);
1252
1253	/* Enable advertising in case this was a failed connection
1254	* attempt as a peripheral.
1255	*/
1256	hci_enable_advertising(hdev);
1257	}
1258
1259	/* This function requires the caller holds hdev->lock */
1260	void hci_conn_failed(struct hci_conn *conn, u8 status)
1261	{
1262	struct hci_dev *hdev = conn->hdev;
1263
1264	bt_dev_dbg(hdev, "status 0x%2.2x", status);
1265
1266	switch (conn->type) {
1267	case LE_LINK:
1268	hci_le_conn_failed(conn, status);
1269	break;
1270	case ACL_LINK:
1271	mgmt_connect_failed(hdev, bdaddr: &conn->dst, link_type: conn->type,
1272	addr_type: conn->dst_type, status);
1273	break;
1274	}
1275
1276	/* In case of BIG/PA sync failed, clear conn flags so that
1277	* the conns will be correctly cleaned up by ISO layer
1278	*/
1279	test_and_clear_bit(nr: HCI_CONN_BIG_SYNC_FAILED, addr: &conn->flags);
1280	test_and_clear_bit(nr: HCI_CONN_PA_SYNC_FAILED, addr: &conn->flags);
1281
1282	conn->state = BT_CLOSED;
1283	hci_connect_cfm(conn, status);
1284	hci_conn_del(conn);
1285	}
1286
1287	/* This function requires the caller holds hdev->lock */
1288	u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1289	{
1290	struct hci_dev *hdev = conn->hdev;
1291
1292	bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1293
1294	if (conn->handle == handle)
1295	return 0;
1296
1297	if (handle > HCI_CONN_HANDLE_MAX) {
1298	bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1299	handle, HCI_CONN_HANDLE_MAX);
1300	return HCI_ERROR_INVALID_PARAMETERS;
1301	}
1302
1303	/* If abort_reason has been sent it means the connection is being
1304	* aborted and the handle shall not be changed.
1305	*/
1306	if (conn->abort_reason)
1307	return conn->abort_reason;
1308
1309	if (HCI_CONN_HANDLE_UNSET(conn->handle))
1310	ida_free(&hdev->unset_handle_ida, id: conn->handle);
1311
1312	conn->handle = handle;
1313
1314	return 0;
1315	}
1316
1317	static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
1318	{
1319	struct hci_conn *conn;
1320	u16 handle = PTR_UINT(data);
1321
1322	conn = hci_conn_hash_lookup_handle(hdev, handle);
1323	if (!conn)
1324	return;
1325
1326	bt_dev_dbg(hdev, "err %d", err);
1327
1328	hci_dev_lock(hdev);
1329
1330	if (!err) {
1331	hci_connect_le_scan_cleanup(conn, status: 0x00);
1332	goto done;
1333	}
1334
1335	/* Check if connection is still pending */
1336	if (conn != hci_lookup_le_connect(hdev))
1337	goto done;
1338
1339	/* Flush to make sure we send create conn cancel command if needed */
1340	flush_delayed_work(dwork: &conn->le_conn_timeout);
1341	hci_conn_failed(conn, status: bt_status(err));
1342
1343	done:
1344	hci_dev_unlock(hdev);
1345	}
1346
1347	static int hci_connect_le_sync(struct hci_dev *hdev, void *data)
1348	{
1349	struct hci_conn *conn;
1350	u16 handle = PTR_UINT(data);
1351
1352	conn = hci_conn_hash_lookup_handle(hdev, handle);
1353	if (!conn)
1354	return 0;
1355
1356	bt_dev_dbg(hdev, "conn %p", conn);
1357
1358	clear_bit(nr: HCI_CONN_SCANNING, addr: &conn->flags);
1359	conn->state = BT_CONNECT;
1360
1361	return hci_le_create_conn_sync(hdev, conn);
1362	}
1363
1364	struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1365	u8 dst_type, bool dst_resolved, u8 sec_level,
1366	u16 conn_timeout, u8 role)
1367	{
1368	struct hci_conn *conn;
1369	struct smp_irk *irk;
1370	int err;
1371
1372	/* Let's make sure that le is enabled.*/
1373	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1374	if (lmp_le_capable(hdev))
1375	return ERR_PTR(error: -ECONNREFUSED);
1376
1377	return ERR_PTR(error: -EOPNOTSUPP);
1378	}
1379
1380	/* Since the controller supports only one LE connection attempt at a
1381	* time, we return -EBUSY if there is any connection attempt running.
1382	*/
1383	if (hci_lookup_le_connect(hdev))
1384	return ERR_PTR(error: -EBUSY);
1385
1386	/* If there's already a connection object but it's not in
1387	* scanning state it means it must already be established, in
1388	* which case we can't do anything else except report a failure
1389	* to connect.
1390	*/
1391	conn = hci_conn_hash_lookup_le(hdev, ba: dst, ba_type: dst_type);
1392	if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1393	return ERR_PTR(error: -EBUSY);
1394	}
1395
1396	/* Check if the destination address has been resolved by the controller
1397	* since if it did then the identity address shall be used.
1398	*/
1399	if (!dst_resolved) {
1400	/* When given an identity address with existing identity
1401	* resolving key, the connection needs to be established
1402	* to a resolvable random address.
1403	*
1404	* Storing the resolvable random address is required here
1405	* to handle connection failures. The address will later
1406	* be resolved back into the original identity address
1407	* from the connect request.
1408	*/
1409	irk = hci_find_irk_by_addr(hdev, bdaddr: dst, addr_type: dst_type);
1410	if (irk && bacmp(ba1: &irk->rpa, BDADDR_ANY)) {
1411	dst = &irk->rpa;
1412	dst_type = ADDR_LE_DEV_RANDOM;
1413	}
1414	}
1415
1416	if (conn) {
1417	bacpy(dst: &conn->dst, src: dst);
1418	} else {
1419	conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1420	if (!conn)
1421	return ERR_PTR(error: -ENOMEM);
1422	hci_conn_hold(conn);
1423	conn->pending_sec_level = sec_level;
1424	}
1425
1426	conn->dst_type = dst_type;
1427	conn->sec_level = BT_SECURITY_LOW;
1428	conn->conn_timeout = conn_timeout;
1429
1430	err = hci_cmd_sync_queue(hdev, func: hci_connect_le_sync,
1431	UINT_PTR(conn->handle),
1432	destroy: create_le_conn_complete);
1433	if (err) {
1434	hci_conn_del(conn);
1435	return ERR_PTR(error: err);
1436	}
1437
1438	return conn;
1439	}
1440
1441	static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1442	{
1443	struct hci_conn *conn;
1444
1445	conn = hci_conn_hash_lookup_le(hdev, ba: addr, ba_type: type);
1446	if (!conn)
1447	return false;
1448
1449	if (conn->state != BT_CONNECTED)
1450	return false;
1451
1452	return true;
1453	}
1454
1455	/* This function requires the caller holds hdev->lock */
1456	static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1457	bdaddr_t *addr, u8 addr_type)
1458	{
1459	struct hci_conn_params *params;
1460
1461	if (is_connected(hdev, addr, type: addr_type))
1462	return -EISCONN;
1463
1464	params = hci_conn_params_lookup(hdev, addr, addr_type);
1465	if (!params) {
1466	params = hci_conn_params_add(hdev, addr, addr_type);
1467	if (!params)
1468	return -ENOMEM;
1469
1470	/* If we created new params, mark them to be deleted in
1471	* hci_connect_le_scan_cleanup. It's different case than
1472	* existing disabled params, those will stay after cleanup.
1473	*/
1474	params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1475	}
1476
1477	/* We're trying to connect, so make sure params are at pend_le_conns */
1478	if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1479	params->auto_connect == HCI_AUTO_CONN_REPORT ||
1480	params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1481	hci_pend_le_list_del_init(param: params);
1482	hci_pend_le_list_add(param: params, list: &hdev->pend_le_conns);
1483	}
1484
1485	params->explicit_connect = true;
1486
1487	BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1488	params->auto_connect);
1489
1490	return 0;
1491	}
1492
1493	static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1494	{
1495	struct hci_conn *conn;
1496	u8 big;
1497
1498	/* Allocate a BIG if not set */
1499	if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1500	for (big = 0x00; big < 0xef; big++) {
1501
1502	conn = hci_conn_hash_lookup_big(hdev, handle: big);
1503	if (!conn)
1504	break;
1505	}
1506
1507	if (big == 0xef)
1508	return -EADDRNOTAVAIL;
1509
1510	/* Update BIG */
1511	qos->bcast.big = big;
1512	}
1513
1514	return 0;
1515	}
1516
1517	static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1518	{
1519	struct hci_conn *conn;
1520	u8 bis;
1521
1522	/* Allocate BIS if not set */
1523	if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1524	if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1525	conn = hci_conn_hash_lookup_big(hdev, handle: qos->bcast.big);
1526
1527	if (conn) {
1528	/* If the BIG handle is already matched to an advertising
1529	* handle, do not allocate a new one.
1530	*/
1531	qos->bcast.bis = conn->iso_qos.bcast.bis;
1532	return 0;
1533	}
1534	}
1535
1536	/* Find an unused adv set to advertise BIS, skip instance 0x00
1537	* since it is reserved as general purpose set.
1538	*/
1539	for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1540	bis++) {
1541
1542	conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1543	if (!conn)
1544	break;
1545	}
1546
1547	if (bis == hdev->le_num_of_adv_sets)
1548	return -EADDRNOTAVAIL;
1549
1550	/* Update BIS */
1551	qos->bcast.bis = bis;
1552	}
1553
1554	return 0;
1555	}
1556
1557	/* This function requires the caller holds hdev->lock */
1558	static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1559	struct bt_iso_qos *qos, __u8 base_len,
1560	__u8 *base)
1561	{
1562	struct hci_conn *conn;
1563	int err;
1564
1565	/* Let's make sure that le is enabled.*/
1566	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1567	if (lmp_le_capable(hdev))
1568	return ERR_PTR(error: -ECONNREFUSED);
1569	return ERR_PTR(error: -EOPNOTSUPP);
1570	}
1571
1572	err = qos_set_big(hdev, qos);
1573	if (err)
1574	return ERR_PTR(error: err);
1575
1576	err = qos_set_bis(hdev, qos);
1577	if (err)
1578	return ERR_PTR(error: err);
1579
1580	/* Check if the LE Create BIG command has already been sent */
1581	conn = hci_conn_hash_lookup_per_adv_bis(hdev, ba: dst, big: qos->bcast.big,
1582	bis: qos->bcast.big);
1583	if (conn)
1584	return ERR_PTR(error: -EADDRINUSE);
1585
1586	/* Check BIS settings against other bound BISes, since all
1587	* BISes in a BIG must have the same value for all parameters
1588	*/
1589	conn = hci_conn_hash_lookup_big(hdev, handle: qos->bcast.big);
1590
1591	if (conn && (memcmp(p: qos, q: &conn->iso_qos, size: sizeof(*qos)) ||
1592	base_len != conn->le_per_adv_data_len ||
1593	memcmp(p: conn->le_per_adv_data, q: base, size: base_len)))
1594	return ERR_PTR(error: -EADDRINUSE);
1595
1596	conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1597	if (!conn)
1598	return ERR_PTR(error: -ENOMEM);
1599
1600	conn->state = BT_CONNECT;
1601
1602	hci_conn_hold(conn);
1603	return conn;
1604	}
1605
1606	/* This function requires the caller holds hdev->lock */
1607	struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1608	u8 dst_type, u8 sec_level,
1609	u16 conn_timeout,
1610	enum conn_reasons conn_reason)
1611	{
1612	struct hci_conn *conn;
1613
1614	/* Let's make sure that le is enabled.*/
1615	if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1616	if (lmp_le_capable(hdev))
1617	return ERR_PTR(error: -ECONNREFUSED);
1618
1619	return ERR_PTR(error: -EOPNOTSUPP);
1620	}
1621
1622	/* Some devices send ATT messages as soon as the physical link is
1623	* established. To be able to handle these ATT messages, the user-
1624	* space first establishes the connection and then starts the pairing
1625	* process.
1626	*
1627	* So if a hci_conn object already exists for the following connection
1628	* attempt, we simply update pending_sec_level and auth_type fields
1629	* and return the object found.
1630	*/
1631	conn = hci_conn_hash_lookup_le(hdev, ba: dst, ba_type: dst_type);
1632	if (conn) {
1633	if (conn->pending_sec_level < sec_level)
1634	conn->pending_sec_level = sec_level;
1635	goto done;
1636	}
1637
1638	BT_DBG("requesting refresh of dst_addr");
1639
1640	conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1641	if (!conn)
1642	return ERR_PTR(error: -ENOMEM);
1643
1644	if (hci_explicit_conn_params_set(hdev, addr: dst, addr_type: dst_type) < 0) {
1645	hci_conn_del(conn);
1646	return ERR_PTR(error: -EBUSY);
1647	}
1648
1649	conn->state = BT_CONNECT;
1650	set_bit(nr: HCI_CONN_SCANNING, addr: &conn->flags);
1651	conn->dst_type = dst_type;
1652	conn->sec_level = BT_SECURITY_LOW;
1653	conn->pending_sec_level = sec_level;
1654	conn->conn_timeout = conn_timeout;
1655	conn->conn_reason = conn_reason;
1656
1657	hci_update_passive_scan(hdev);
1658
1659	done:
1660	hci_conn_hold(conn);
1661	return conn;
1662	}
1663
1664	struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1665	u8 sec_level, u8 auth_type,
1666	enum conn_reasons conn_reason)
1667	{
1668	struct hci_conn *acl;
1669
1670	if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1671	if (lmp_bredr_capable(hdev))
1672	return ERR_PTR(error: -ECONNREFUSED);
1673
1674	return ERR_PTR(error: -EOPNOTSUPP);
1675	}
1676
1677	/* Reject outgoing connection to device with same BD ADDR against
1678	* CVE-2020-26555
1679	*/
1680	if (!bacmp(ba1: &hdev->bdaddr, ba2: dst)) {
1681	bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1682	dst);
1683	return ERR_PTR(error: -ECONNREFUSED);
1684	}
1685
1686	acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, ba: dst);
1687	if (!acl) {
1688	acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1689	if (!acl)
1690	return ERR_PTR(error: -ENOMEM);
1691	}
1692
1693	hci_conn_hold(conn: acl);
1694
1695	acl->conn_reason = conn_reason;
1696	if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1697	acl->sec_level = BT_SECURITY_LOW;
1698	acl->pending_sec_level = sec_level;
1699	acl->auth_type = auth_type;
1700	hci_acl_create_connection(conn: acl);
1701	}
1702
1703	return acl;
1704	}
1705
1706	static struct hci_link *hci_conn_link(struct hci_conn *parent,
1707	struct hci_conn *conn)
1708	{
1709	struct hci_dev *hdev = parent->hdev;
1710	struct hci_link *link;
1711
1712	bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1713
1714	if (conn->link)
1715	return conn->link;
1716
1717	if (conn->parent)
1718	return NULL;
1719
1720	link = kzalloc(size: sizeof(*link), GFP_KERNEL);
1721	if (!link)
1722	return NULL;
1723
1724	link->conn = hci_conn_hold(conn);
1725	conn->link = link;
1726	conn->parent = hci_conn_get(conn: parent);
1727
1728	/* Use list_add_tail_rcu append to the list */
1729	list_add_tail_rcu(new: &link->list, head: &parent->link_list);
1730
1731	return link;
1732	}
1733
1734	struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1735	__u16 setting, struct bt_codec *codec)
1736	{
1737	struct hci_conn *acl;
1738	struct hci_conn *sco;
1739	struct hci_link *link;
1740
1741	acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1742	conn_reason: CONN_REASON_SCO_CONNECT);
1743	if (IS_ERR(ptr: acl))
1744	return acl;
1745
1746	sco = hci_conn_hash_lookup_ba(hdev, type, ba: dst);
1747	if (!sco) {
1748	sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1749	if (!sco) {
1750	hci_conn_drop(conn: acl);
1751	return ERR_PTR(error: -ENOMEM);
1752	}
1753	}
1754
1755	link = hci_conn_link(parent: acl, conn: sco);
1756	if (!link) {
1757	hci_conn_drop(conn: acl);
1758	hci_conn_drop(conn: sco);
1759	return ERR_PTR(error: -ENOLINK);
1760	}
1761
1762	sco->setting = setting;
1763	sco->codec = *codec;
1764
1765	if (acl->state == BT_CONNECTED &&
1766	(sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1767	set_bit(nr: HCI_CONN_POWER_SAVE, addr: &acl->flags);
1768	hci_conn_enter_active_mode(conn: acl, BT_POWER_FORCE_ACTIVE_ON);
1769
1770	if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1771	/* defer SCO setup until mode change completed */
1772	set_bit(nr: HCI_CONN_SCO_SETUP_PEND, addr: &acl->flags);
1773	return sco;
1774	}
1775
1776	hci_sco_setup(conn: acl, status: 0x00);
1777	}
1778
1779	return sco;
1780	}
1781
1782	static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1783	{
1784	struct hci_dev *hdev = conn->hdev;
1785	struct hci_cp_le_create_big cp;
1786	struct iso_list_data data;
1787
1788	memset(&cp, 0, sizeof(cp));
1789
1790	data.big = qos->bcast.big;
1791	data.bis = qos->bcast.bis;
1792	data.count = 0;
1793
1794	/* Create a BIS for each bound connection */
1795	hci_conn_hash_list_state(hdev, func: bis_list, ISO_LINK,
1796	state: BT_BOUND, data: &data);
1797
1798	cp.handle = qos->bcast.big;
1799	cp.adv_handle = qos->bcast.bis;
1800	cp.num_bis = data.count;
1801	hci_cpu_to_le24(val: qos->bcast.out.interval, dst: cp.bis.sdu_interval);
1802	cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1803	cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1804	cp.bis.rtn = qos->bcast.out.rtn;
1805	cp.bis.phy = qos->bcast.out.phy;
1806	cp.bis.packing = qos->bcast.packing;
1807	cp.bis.framing = qos->bcast.framing;
1808	cp.bis.encryption = qos->bcast.encryption;
1809	memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1810
1811	return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, plen: sizeof(cp), param: &cp);
1812	}
1813
1814	static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1815	{
1816	u8 cig_id = PTR_UINT(data);
1817	struct hci_conn *conn;
1818	struct bt_iso_qos *qos;
1819	struct iso_cig_params pdu;
1820	u8 cis_id;
1821
1822	conn = hci_conn_hash_lookup_cig(hdev, handle: cig_id);
1823	if (!conn)
1824	return 0;
1825
1826	memset(&pdu, 0, sizeof(pdu));
1827
1828	qos = &conn->iso_qos;
1829	pdu.cp.cig_id = cig_id;
1830	hci_cpu_to_le24(val: qos->ucast.out.interval, dst: pdu.cp.c_interval);
1831	hci_cpu_to_le24(val: qos->ucast.in.interval, dst: pdu.cp.p_interval);
1832	pdu.cp.sca = qos->ucast.sca;
1833	pdu.cp.packing = qos->ucast.packing;
1834	pdu.cp.framing = qos->ucast.framing;
1835	pdu.cp.c_latency = cpu_to_le16(qos->ucast.out.latency);
1836	pdu.cp.p_latency = cpu_to_le16(qos->ucast.in.latency);
1837
1838	/* Reprogram all CIS(s) with the same CIG, valid range are:
1839	* num_cis: 0x00 to 0x1F
1840	* cis_id: 0x00 to 0xEF
1841	*/
1842	for (cis_id = 0x00; cis_id < 0xf0 &&
1843	pdu.cp.num_cis < ARRAY_SIZE(pdu.cis); cis_id++) {
1844	struct hci_cis_params *cis;
1845
1846	conn = hci_conn_hash_lookup_cis(hdev, NULL, ba_type: 0, cig: cig_id, id: cis_id);
1847	if (!conn)
1848	continue;
1849
1850	qos = &conn->iso_qos;
1851
1852	cis = &pdu.cis[pdu.cp.num_cis++];
1853	cis->cis_id = cis_id;
1854	cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1855	cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1856	cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
1857	qos->ucast.in.phy;
1858	cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
1859	qos->ucast.out.phy;
1860	cis->c_rtn = qos->ucast.out.rtn;
1861	cis->p_rtn = qos->ucast.in.rtn;
1862	}
1863
1864	if (!pdu.cp.num_cis)
1865	return 0;
1866
1867	return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1868	plen: sizeof(pdu.cp) +
1869	pdu.cp.num_cis * sizeof(pdu.cis[0]), param: &pdu,
1870	HCI_CMD_TIMEOUT);
1871	}
1872
1873	static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1874	{
1875	struct hci_dev *hdev = conn->hdev;
1876	struct iso_list_data data;
1877
1878	memset(&data, 0, sizeof(data));
1879
1880	/* Allocate first still reconfigurable CIG if not set */
1881	if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1882	for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1883	data.count = 0;
1884
1885	hci_conn_hash_list_state(hdev, func: find_cis, ISO_LINK,
1886	state: BT_CONNECT, data: &data);
1887	if (data.count)
1888	continue;
1889
1890	hci_conn_hash_list_state(hdev, func: find_cis, ISO_LINK,
1891	state: BT_CONNECTED, data: &data);
1892	if (!data.count)
1893	break;
1894	}
1895
1896	if (data.cig == 0xf0)
1897	return false;
1898
1899	/* Update CIG */
1900	qos->ucast.cig = data.cig;
1901	}
1902
1903	if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1904	if (hci_conn_hash_lookup_cis(hdev, NULL, ba_type: 0, cig: qos->ucast.cig,
1905	id: qos->ucast.cis))
1906	return false;
1907	goto done;
1908	}
1909
1910	/* Allocate first available CIS if not set */
1911	for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1912	data.cis++) {
1913	if (!hci_conn_hash_lookup_cis(hdev, NULL, ba_type: 0, cig: data.cig,
1914	id: data.cis)) {
1915	/* Update CIS */
1916	qos->ucast.cis = data.cis;
1917	break;
1918	}
1919	}
1920
1921	if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1922	return false;
1923
1924	done:
1925	if (hci_cmd_sync_queue(hdev, func: set_cig_params_sync,
1926	UINT_PTR(qos->ucast.cig), NULL) < 0)
1927	return false;
1928
1929	return true;
1930	}
1931
1932	struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1933	__u8 dst_type, struct bt_iso_qos *qos)
1934	{
1935	struct hci_conn *cis;
1936
1937	cis = hci_conn_hash_lookup_cis(hdev, ba: dst, ba_type: dst_type, cig: qos->ucast.cig,
1938	id: qos->ucast.cis);
1939	if (!cis) {
1940	cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1941	if (!cis)
1942	return ERR_PTR(error: -ENOMEM);
1943	cis->cleanup = cis_cleanup;
1944	cis->dst_type = dst_type;
1945	cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1946	cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1947	}
1948
1949	if (cis->state == BT_CONNECTED)
1950	return cis;
1951
1952	/* Check if CIS has been set and the settings matches */
1953	if (cis->state == BT_BOUND &&
1954	!memcmp(p: &cis->iso_qos, q: qos, size: sizeof(*qos)))
1955	return cis;
1956
1957	/* Update LINK PHYs according to QoS preference */
1958	cis->le_tx_phy = qos->ucast.out.phy;
1959	cis->le_rx_phy = qos->ucast.in.phy;
1960
1961	/* If output interval is not set use the input interval as it cannot be
1962	* 0x000000.
1963	*/
1964	if (!qos->ucast.out.interval)
1965	qos->ucast.out.interval = qos->ucast.in.interval;
1966
1967	/* If input interval is not set use the output interval as it cannot be
1968	* 0x000000.
1969	*/
1970	if (!qos->ucast.in.interval)
1971	qos->ucast.in.interval = qos->ucast.out.interval;
1972
1973	/* If output latency is not set use the input latency as it cannot be
1974	* 0x0000.
1975	*/
1976	if (!qos->ucast.out.latency)
1977	qos->ucast.out.latency = qos->ucast.in.latency;
1978
1979	/* If input latency is not set use the output latency as it cannot be
1980	* 0x0000.
1981	*/
1982	if (!qos->ucast.in.latency)
1983	qos->ucast.in.latency = qos->ucast.out.latency;
1984
1985	if (!hci_le_set_cig_params(conn: cis, qos)) {
1986	hci_conn_drop(conn: cis);
1987	return ERR_PTR(error: -EINVAL);
1988	}
1989
1990	hci_conn_hold(conn: cis);
1991
1992	cis->iso_qos = *qos;
1993	cis->state = BT_BOUND;
1994
1995	return cis;
1996	}
1997
1998	bool hci_iso_setup_path(struct hci_conn *conn)
1999	{
2000	struct hci_dev *hdev = conn->hdev;
2001	struct hci_cp_le_setup_iso_path cmd;
2002
2003	memset(&cmd, 0, sizeof(cmd));
2004
2005	if (conn->iso_qos.ucast.out.sdu) {
2006	cmd.handle = cpu_to_le16(conn->handle);
2007	cmd.direction = 0x00; /* Input (Host to Controller) */
2008	cmd.path = 0x00; /* HCI path if enabled */
2009	cmd.codec = 0x03; /* Transparent Data */
2010
2011	if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, plen: sizeof(cmd),
2012	param: &cmd) < 0)
2013	return false;
2014	}
2015
2016	if (conn->iso_qos.ucast.in.sdu) {
2017	cmd.handle = cpu_to_le16(conn->handle);
2018	cmd.direction = 0x01; /* Output (Controller to Host) */
2019	cmd.path = 0x00; /* HCI path if enabled */
2020	cmd.codec = 0x03; /* Transparent Data */
2021
2022	if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, plen: sizeof(cmd),
2023	param: &cmd) < 0)
2024	return false;
2025	}
2026
2027	return true;
2028	}
2029
2030	int hci_conn_check_create_cis(struct hci_conn *conn)
2031	{
2032	if (conn->type != ISO_LINK || !bacmp(ba1: &conn->dst, BDADDR_ANY))
2033	return -EINVAL;
2034
2035	if (!conn->parent || conn->parent->state != BT_CONNECTED ||
2036	conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
2037	return 1;
2038
2039	return 0;
2040	}
2041
2042	static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
2043	{
2044	return hci_le_create_cis_sync(hdev);
2045	}
2046
2047	int hci_le_create_cis_pending(struct hci_dev *hdev)
2048	{
2049	struct hci_conn *conn;
2050	bool pending = false;
2051
2052	rcu_read_lock();
2053
2054	list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
2055	if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
2056	rcu_read_unlock();
2057	return -EBUSY;
2058	}
2059
2060	if (!hci_conn_check_create_cis(conn))
2061	pending = true;
2062	}
2063
2064	rcu_read_unlock();
2065
2066	if (!pending)
2067	return 0;
2068
2069	/* Queue Create CIS */
2070	return hci_cmd_sync_queue(hdev, func: hci_create_cis_sync, NULL, NULL);
2071	}
2072
2073	static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2074	struct bt_iso_io_qos *qos, __u8 phy)
2075	{
2076	/* Only set MTU if PHY is enabled */
2077	if (!qos->sdu && qos->phy) {
2078	if (hdev->iso_mtu > 0)
2079	qos->sdu = hdev->iso_mtu;
2080	else if (hdev->le_mtu > 0)
2081	qos->sdu = hdev->le_mtu;
2082	else
2083	qos->sdu = hdev->acl_mtu;
2084	}
2085
2086	/* Use the same PHY as ACL if set to any */
2087	if (qos->phy == BT_ISO_PHY_ANY)
2088	qos->phy = phy;
2089
2090	/* Use LE ACL connection interval if not set */
2091	if (!qos->interval)
2092	/* ACL interval unit in 1.25 ms to us */
2093	qos->interval = conn->le_conn_interval * 1250;
2094
2095	/* Use LE ACL connection latency if not set */
2096	if (!qos->latency)
2097	qos->latency = conn->le_conn_latency;
2098	}
2099
2100	static int create_big_sync(struct hci_dev *hdev, void *data)
2101	{
2102	struct hci_conn *conn = data;
2103	struct bt_iso_qos *qos = &conn->iso_qos;
2104	u16 interval, sync_interval = 0;
2105	u32 flags = 0;
2106	int err;
2107
2108	if (qos->bcast.out.phy == 0x02)
2109	flags |= MGMT_ADV_FLAG_SEC_2M;
2110
2111	/* Align intervals */
2112	interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2113
2114	if (qos->bcast.bis)
2115	sync_interval = interval * 4;
2116
2117	err = hci_start_per_adv_sync(hdev, instance: qos->bcast.bis, data_len: conn->le_per_adv_data_len,
2118	data: conn->le_per_adv_data, flags, min_interval: interval,
2119	max_interval: interval, sync_interval);
2120	if (err)
2121	return err;
2122
2123	return hci_le_create_big(conn, qos: &conn->iso_qos);
2124	}
2125
2126	static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
2127	{
2128	struct hci_cp_le_pa_create_sync *cp = data;
2129
2130	bt_dev_dbg(hdev, "");
2131
2132	if (err)
2133	bt_dev_err(hdev, "Unable to create PA: %d", err);
2134
2135	kfree(objp: cp);
2136	}
2137
2138	static int create_pa_sync(struct hci_dev *hdev, void *data)
2139	{
2140	struct hci_cp_le_pa_create_sync *cp = data;
2141	int err;
2142
2143	err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
2144	plen: sizeof(*cp), param: cp, HCI_CMD_TIMEOUT);
2145	if (err) {
2146	hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2147	return err;
2148	}
2149
2150	return hci_update_passive_scan_sync(hdev);
2151	}
2152
2153	int hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, __u8 dst_type,
2154	__u8 sid, struct bt_iso_qos *qos)
2155	{
2156	struct hci_cp_le_pa_create_sync *cp;
2157
2158	if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
2159	return -EBUSY;
2160
2161	cp = kzalloc(size: sizeof(*cp), GFP_KERNEL);
2162	if (!cp) {
2163	hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2164	return -ENOMEM;
2165	}
2166
2167	cp->options = qos->bcast.options;
2168	cp->sid = sid;
2169	cp->addr_type = dst_type;
2170	bacpy(dst: &cp->addr, src: dst);
2171	cp->skip = cpu_to_le16(qos->bcast.skip);
2172	cp->sync_timeout = cpu_to_le16(qos->bcast.sync_timeout);
2173	cp->sync_cte_type = qos->bcast.sync_cte_type;
2174
2175	/* Queue start pa_create_sync and scan */
2176	return hci_cmd_sync_queue(hdev, func: create_pa_sync, data: cp, destroy: create_pa_complete);
2177	}
2178
2179	int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2180	struct bt_iso_qos *qos,
2181	__u16 sync_handle, __u8 num_bis, __u8 bis[])
2182	{
2183	struct _packed {
2184	struct hci_cp_le_big_create_sync cp;
2185	__u8 bis[0x11];
2186	} pdu;
2187	int err;
2188
2189	if (num_bis < 0x01 || num_bis > sizeof(pdu.bis))
2190	return -EINVAL;
2191
2192	err = qos_set_big(hdev, qos);
2193	if (err)
2194	return err;
2195
2196	if (hcon)
2197	hcon->iso_qos.bcast.big = qos->bcast.big;
2198
2199	memset(&pdu, 0, sizeof(pdu));
2200	pdu.cp.handle = qos->bcast.big;
2201	pdu.cp.sync_handle = cpu_to_le16(sync_handle);
2202	pdu.cp.encryption = qos->bcast.encryption;
2203	memcpy(pdu.cp.bcode, qos->bcast.bcode, sizeof(pdu.cp.bcode));
2204	pdu.cp.mse = qos->bcast.mse;
2205	pdu.cp.timeout = cpu_to_le16(qos->bcast.timeout);
2206	pdu.cp.num_bis = num_bis;
2207	memcpy(pdu.bis, bis, num_bis);
2208
2209	return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
2210	plen: sizeof(pdu.cp) + num_bis, param: &pdu);
2211	}
2212
2213	static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2214	{
2215	struct hci_conn *conn = data;
2216
2217	bt_dev_dbg(hdev, "conn %p", conn);
2218
2219	if (err) {
2220	bt_dev_err(hdev, "Unable to create BIG: %d", err);
2221	hci_connect_cfm(conn, status: err);
2222	hci_conn_del(conn);
2223	}
2224	}
2225
2226	struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst,
2227	struct bt_iso_qos *qos,
2228	__u8 base_len, __u8 *base)
2229	{
2230	struct hci_conn *conn;
2231	__u8 eir[HCI_MAX_PER_AD_LENGTH];
2232
2233	if (base_len && base)
2234	base_len = eir_append_service_data(eir, eir_len: 0, uuid: 0x1851,
2235	data: base, data_len: base_len);
2236
2237	/* We need hci_conn object using the BDADDR_ANY as dst */
2238	conn = hci_add_bis(hdev, dst, qos, base_len, base: eir);
2239	if (IS_ERR(ptr: conn))
2240	return conn;
2241
2242	/* Update LINK PHYs according to QoS preference */
2243	conn->le_tx_phy = qos->bcast.out.phy;
2244	conn->le_tx_phy = qos->bcast.out.phy;
2245
2246	/* Add Basic Announcement into Peridic Adv Data if BASE is set */
2247	if (base_len && base) {
2248	memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2249	conn->le_per_adv_data_len = base_len;
2250	}
2251
2252	hci_iso_qos_setup(hdev, conn, qos: &qos->bcast.out,
2253	phy: conn->le_tx_phy ? conn->le_tx_phy :
2254	hdev->le_tx_def_phys);
2255
2256	conn->iso_qos = *qos;
2257	conn->state = BT_BOUND;
2258
2259	return conn;
2260	}
2261
2262	static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2263	{
2264	struct iso_list_data *d = data;
2265
2266	/* Skip if not broadcast/ANY address */
2267	if (bacmp(ba1: &conn->dst, BDADDR_ANY))
2268	return;
2269
2270	if (d->big != conn->iso_qos.bcast.big ||
2271	d->bis == BT_ISO_QOS_BIS_UNSET ||
2272	d->bis != conn->iso_qos.bcast.bis)
2273	return;
2274
2275	set_bit(nr: HCI_CONN_PER_ADV, addr: &conn->flags);
2276	}
2277
2278	struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2279	__u8 dst_type, struct bt_iso_qos *qos,
2280	__u8 base_len, __u8 *base)
2281	{
2282	struct hci_conn *conn;
2283	int err;
2284	struct iso_list_data data;
2285
2286	conn = hci_bind_bis(hdev, dst, qos, base_len, base);
2287	if (IS_ERR(ptr: conn))
2288	return conn;
2289
2290	data.big = qos->bcast.big;
2291	data.bis = qos->bcast.bis;
2292
2293	/* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2294	* the start periodic advertising and create BIG commands have
2295	* been queued
2296	*/
2297	hci_conn_hash_list_state(hdev, func: bis_mark_per_adv, ISO_LINK,
2298	state: BT_BOUND, data: &data);
2299
2300	/* Queue start periodic advertising and create BIG */
2301	err = hci_cmd_sync_queue(hdev, func: create_big_sync, data: conn,
2302	destroy: create_big_complete);
2303	if (err < 0) {
2304	hci_conn_drop(conn);
2305	return ERR_PTR(error: err);
2306	}
2307
2308	return conn;
2309	}
2310
2311	struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2312	__u8 dst_type, struct bt_iso_qos *qos)
2313	{
2314	struct hci_conn *le;
2315	struct hci_conn *cis;
2316	struct hci_link *link;
2317
2318	if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2319	le = hci_connect_le(hdev, dst, dst_type, dst_resolved: false,
2320	BT_SECURITY_LOW,
2321	HCI_LE_CONN_TIMEOUT,
2322	HCI_ROLE_SLAVE);
2323	else
2324	le = hci_connect_le_scan(hdev, dst, dst_type,
2325	BT_SECURITY_LOW,
2326	HCI_LE_CONN_TIMEOUT,
2327	conn_reason: CONN_REASON_ISO_CONNECT);
2328	if (IS_ERR(ptr: le))
2329	return le;
2330
2331	hci_iso_qos_setup(hdev, conn: le, qos: &qos->ucast.out,
2332	phy: le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2333	hci_iso_qos_setup(hdev, conn: le, qos: &qos->ucast.in,
2334	phy: le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2335
2336	cis = hci_bind_cis(hdev, dst, dst_type, qos);
2337	if (IS_ERR(ptr: cis)) {
2338	hci_conn_drop(conn: le);
2339	return cis;
2340	}
2341
2342	link = hci_conn_link(parent: le, conn: cis);
2343	if (!link) {
2344	hci_conn_drop(conn: le);
2345	hci_conn_drop(conn: cis);
2346	return ERR_PTR(error: -ENOLINK);
2347	}
2348
2349	/* Link takes the refcount */
2350	hci_conn_drop(conn: cis);
2351
2352	cis->state = BT_CONNECT;
2353
2354	hci_le_create_cis_pending(hdev);
2355
2356	return cis;
2357	}
2358
2359	/* Check link security requirement */
2360	int hci_conn_check_link_mode(struct hci_conn *conn)
2361	{
2362	BT_DBG("hcon %p", conn);
2363
2364	/* In Secure Connections Only mode, it is required that Secure
2365	* Connections is used and the link is encrypted with AES-CCM
2366	* using a P-256 authenticated combination key.
2367	*/
2368	if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2369	if (!hci_conn_sc_enabled(conn) ||
2370	!test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2371	conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2372	return 0;
2373	}
2374
2375	/* AES encryption is required for Level 4:
2376	*
2377	* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2378	* page 1319:
2379	*
2380	* 128-bit equivalent strength for link and encryption keys
2381	* required using FIPS approved algorithms (E0 not allowed,
2382	* SAFER+ not allowed, and P-192 not allowed; encryption key
2383	* not shortened)
2384	*/
2385	if (conn->sec_level == BT_SECURITY_FIPS &&
2386	!test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2387	bt_dev_err(conn->hdev,
2388	"Invalid security: Missing AES-CCM usage");
2389	return 0;
2390	}
2391
2392	if (hci_conn_ssp_enabled(conn) &&
2393	!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2394	return 0;
2395
2396	return 1;
2397	}
2398
2399	/* Authenticate remote device */
2400	static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2401	{
2402	BT_DBG("hcon %p", conn);
2403
2404	if (conn->pending_sec_level > sec_level)
2405	sec_level = conn->pending_sec_level;
2406
2407	if (sec_level > conn->sec_level)
2408	conn->pending_sec_level = sec_level;
2409	else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2410	return 1;
2411
2412	/* Make sure we preserve an existing MITM requirement*/
2413	auth_type |= (conn->auth_type & 0x01);
2414
2415	conn->auth_type = auth_type;
2416
2417	if (!test_and_set_bit(nr: HCI_CONN_AUTH_PEND, addr: &conn->flags)) {
2418	struct hci_cp_auth_requested cp;
2419
2420	cp.handle = cpu_to_le16(conn->handle);
2421	hci_send_cmd(hdev: conn->hdev, HCI_OP_AUTH_REQUESTED,
2422	plen: sizeof(cp), param: &cp);
2423
2424	/* If we're already encrypted set the REAUTH_PEND flag,
2425	* otherwise set the ENCRYPT_PEND.
2426	*/
2427	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2428	set_bit(nr: HCI_CONN_REAUTH_PEND, addr: &conn->flags);
2429	else
2430	set_bit(nr: HCI_CONN_ENCRYPT_PEND, addr: &conn->flags);
2431	}
2432
2433	return 0;
2434	}
2435
2436	/* Encrypt the link */
2437	static void hci_conn_encrypt(struct hci_conn *conn)
2438	{
2439	BT_DBG("hcon %p", conn);
2440
2441	if (!test_and_set_bit(nr: HCI_CONN_ENCRYPT_PEND, addr: &conn->flags)) {
2442	struct hci_cp_set_conn_encrypt cp;
2443	cp.handle = cpu_to_le16(conn->handle);
2444	cp.encrypt = 0x01;
2445	hci_send_cmd(hdev: conn->hdev, HCI_OP_SET_CONN_ENCRYPT, plen: sizeof(cp),
2446	param: &cp);
2447	}
2448	}
2449
2450	/* Enable security */
2451	int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2452	bool initiator)
2453	{
2454	BT_DBG("hcon %p", conn);
2455
2456	if (conn->type == LE_LINK)
2457	return smp_conn_security(hcon: conn, sec_level);
2458
2459	/* For sdp we don't need the link key. */
2460	if (sec_level == BT_SECURITY_SDP)
2461	return 1;
2462
2463	/* For non 2.1 devices and low security level we don't need the link
2464	key. */
2465	if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2466	return 1;
2467
2468	/* For other security levels we need the link key. */
2469	if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2470	goto auth;
2471
2472	switch (conn->key_type) {
2473	case HCI_LK_AUTH_COMBINATION_P256:
2474	/* An authenticated FIPS approved combination key has
2475	* sufficient security for security level 4 or lower.
2476	*/
2477	if (sec_level <= BT_SECURITY_FIPS)
2478	goto encrypt;
2479	break;
2480	case HCI_LK_AUTH_COMBINATION_P192:
2481	/* An authenticated combination key has sufficient security for
2482	* security level 3 or lower.
2483	*/
2484	if (sec_level <= BT_SECURITY_HIGH)
2485	goto encrypt;
2486	break;
2487	case HCI_LK_UNAUTH_COMBINATION_P192:
2488	case HCI_LK_UNAUTH_COMBINATION_P256:
2489	/* An unauthenticated combination key has sufficient security
2490	* for security level 2 or lower.
2491	*/
2492	if (sec_level <= BT_SECURITY_MEDIUM)
2493	goto encrypt;
2494	break;
2495	case HCI_LK_COMBINATION:
2496	/* A combination key has always sufficient security for the
2497	* security levels 2 or lower. High security level requires the
2498	* combination key is generated using maximum PIN code length
2499	* (16). For pre 2.1 units.
2500	*/
2501	if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2502	goto encrypt;
2503	break;
2504	default:
2505	break;
2506	}
2507
2508	auth:
2509	if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2510	return 0;
2511
2512	if (initiator)
2513	set_bit(nr: HCI_CONN_AUTH_INITIATOR, addr: &conn->flags);
2514
2515	if (!hci_conn_auth(conn, sec_level, auth_type))
2516	return 0;
2517
2518	encrypt:
2519	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2520	/* Ensure that the encryption key size has been read,
2521	* otherwise stall the upper layer responses.
2522	*/
2523	if (!conn->enc_key_size)
2524	return 0;
2525
2526	/* Nothing else needed, all requirements are met */
2527	return 1;
2528	}
2529
2530	hci_conn_encrypt(conn);
2531	return 0;
2532	}
2533	EXPORT_SYMBOL(hci_conn_security);
2534
2535	/* Check secure link requirement */
2536	int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2537	{
2538	BT_DBG("hcon %p", conn);
2539
2540	/* Accept if non-secure or higher security level is required */
2541	if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2542	return 1;
2543
2544	/* Accept if secure or higher security level is already present */
2545	if (conn->sec_level == BT_SECURITY_HIGH ||
2546	conn->sec_level == BT_SECURITY_FIPS)
2547	return 1;
2548
2549	/* Reject not secure link */
2550	return 0;
2551	}
2552	EXPORT_SYMBOL(hci_conn_check_secure);
2553
2554	/* Switch role */
2555	int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2556	{
2557	BT_DBG("hcon %p", conn);
2558
2559	if (role == conn->role)
2560	return 1;
2561
2562	if (!test_and_set_bit(nr: HCI_CONN_RSWITCH_PEND, addr: &conn->flags)) {
2563	struct hci_cp_switch_role cp;
2564	bacpy(dst: &cp.bdaddr, src: &conn->dst);
2565	cp.role = role;
2566	hci_send_cmd(hdev: conn->hdev, HCI_OP_SWITCH_ROLE, plen: sizeof(cp), param: &cp);
2567	}
2568
2569	return 0;
2570	}
2571	EXPORT_SYMBOL(hci_conn_switch_role);
2572
2573	/* Enter active mode */
2574	void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2575	{
2576	struct hci_dev *hdev = conn->hdev;
2577
2578	BT_DBG("hcon %p mode %d", conn, conn->mode);
2579
2580	if (conn->mode != HCI_CM_SNIFF)
2581	goto timer;
2582
2583	if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2584	goto timer;
2585
2586	if (!test_and_set_bit(nr: HCI_CONN_MODE_CHANGE_PEND, addr: &conn->flags)) {
2587	struct hci_cp_exit_sniff_mode cp;
2588	cp.handle = cpu_to_le16(conn->handle);
2589	hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, plen: sizeof(cp), param: &cp);
2590	}
2591
2592	timer:
2593	if (hdev->idle_timeout > 0)
2594	queue_delayed_work(wq: hdev->workqueue, dwork: &conn->idle_work,
2595	delay: msecs_to_jiffies(m: hdev->idle_timeout));
2596	}
2597
2598	/* Drop all connection on the device */
2599	void hci_conn_hash_flush(struct hci_dev *hdev)
2600	{
2601	struct list_head *head = &hdev->conn_hash.list;
2602	struct hci_conn *conn;
2603
2604	BT_DBG("hdev %s", hdev->name);
2605
2606	/* We should not traverse the list here, because hci_conn_del
2607	* can remove extra links, which may cause the list traversal
2608	* to hit items that have already been released.
2609	*/
2610	while ((conn = list_first_entry_or_null(head,
2611	struct hci_conn,
2612	list)) != NULL) {
2613	conn->state = BT_CLOSED;
2614	hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2615	hci_conn_del(conn);
2616	}
2617	}
2618
2619	/* Check pending connect attempts */
2620	void hci_conn_check_pending(struct hci_dev *hdev)
2621	{
2622	struct hci_conn *conn;
2623
2624	BT_DBG("hdev %s", hdev->name);
2625
2626	hci_dev_lock(hdev);
2627
2628	conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, state: BT_CONNECT2);
2629	if (conn)
2630	hci_acl_create_connection(conn);
2631
2632	hci_dev_unlock(hdev);
2633	}
2634
2635	static u32 get_link_mode(struct hci_conn *conn)
2636	{
2637	u32 link_mode = 0;
2638
2639	if (conn->role == HCI_ROLE_MASTER)
2640	link_mode |= HCI_LM_MASTER;
2641
2642	if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2643	link_mode |= HCI_LM_ENCRYPT;
2644
2645	if (test_bit(HCI_CONN_AUTH, &conn->flags))
2646	link_mode |= HCI_LM_AUTH;
2647
2648	if (test_bit(HCI_CONN_SECURE, &conn->flags))
2649	link_mode |= HCI_LM_SECURE;
2650
2651	if (test_bit(HCI_CONN_FIPS, &conn->flags))
2652	link_mode |= HCI_LM_FIPS;
2653
2654	return link_mode;
2655	}
2656
2657	int hci_get_conn_list(void __user *arg)
2658	{
2659	struct hci_conn *c;
2660	struct hci_conn_list_req req, *cl;
2661	struct hci_conn_info *ci;
2662	struct hci_dev *hdev;
2663	int n = 0, size, err;
2664
2665	if (copy_from_user(to: &req, from: arg, n: sizeof(req)))
2666	return -EFAULT;
2667
2668	if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2669	return -EINVAL;
2670
2671	size = sizeof(req) + req.conn_num * sizeof(*ci);
2672
2673	cl = kmalloc(size, GFP_KERNEL);
2674	if (!cl)
2675	return -ENOMEM;
2676
2677	hdev = hci_dev_get(index: req.dev_id);
2678	if (!hdev) {
2679	kfree(objp: cl);
2680	return -ENODEV;
2681	}
2682
2683	ci = cl->conn_info;
2684
2685	hci_dev_lock(hdev);
2686	list_for_each_entry(c, &hdev->conn_hash.list, list) {
2687	bacpy(dst: &(ci + n)->bdaddr, src: &c->dst);
2688	(ci + n)->handle = c->handle;
2689	(ci + n)->type = c->type;
2690	(ci + n)->out = c->out;
2691	(ci + n)->state = c->state;
2692	(ci + n)->link_mode = get_link_mode(conn: c);
2693	if (++n >= req.conn_num)
2694	break;
2695	}
2696	hci_dev_unlock(hdev);
2697
2698	cl->dev_id = hdev->id;
2699	cl->conn_num = n;
2700	size = sizeof(req) + n * sizeof(*ci);
2701
2702	hci_dev_put(d: hdev);
2703
2704	err = copy_to_user(to: arg, from: cl, n: size);
2705	kfree(objp: cl);
2706
2707	return err ? -EFAULT : 0;
2708	}
2709
2710	int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2711	{
2712	struct hci_conn_info_req req;
2713	struct hci_conn_info ci;
2714	struct hci_conn *conn;
2715	char __user *ptr = arg + sizeof(req);
2716
2717	if (copy_from_user(to: &req, from: arg, n: sizeof(req)))
2718	return -EFAULT;
2719
2720	hci_dev_lock(hdev);
2721	conn = hci_conn_hash_lookup_ba(hdev, type: req.type, ba: &req.bdaddr);
2722	if (conn) {
2723	bacpy(dst: &ci.bdaddr, src: &conn->dst);
2724	ci.handle = conn->handle;
2725	ci.type = conn->type;
2726	ci.out = conn->out;
2727	ci.state = conn->state;
2728	ci.link_mode = get_link_mode(conn);
2729	}
2730	hci_dev_unlock(hdev);
2731
2732	if (!conn)
2733	return -ENOENT;
2734
2735	return copy_to_user(to: ptr, from: &ci, n: sizeof(ci)) ? -EFAULT : 0;
2736	}
2737
2738	int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2739	{
2740	struct hci_auth_info_req req;
2741	struct hci_conn *conn;
2742
2743	if (copy_from_user(to: &req, from: arg, n: sizeof(req)))
2744	return -EFAULT;
2745
2746	hci_dev_lock(hdev);
2747	conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, ba: &req.bdaddr);
2748	if (conn)
2749	req.type = conn->auth_type;
2750	hci_dev_unlock(hdev);
2751
2752	if (!conn)
2753	return -ENOENT;
2754
2755	return copy_to_user(to: arg, from: &req, n: sizeof(req)) ? -EFAULT : 0;
2756	}
2757
2758	struct hci_chan *hci_chan_create(struct hci_conn *conn)
2759	{
2760	struct hci_dev *hdev = conn->hdev;
2761	struct hci_chan *chan;
2762
2763	BT_DBG("%s hcon %p", hdev->name, conn);
2764
2765	if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2766	BT_DBG("Refusing to create new hci_chan");
2767	return NULL;
2768	}
2769
2770	chan = kzalloc(size: sizeof(*chan), GFP_KERNEL);
2771	if (!chan)
2772	return NULL;
2773
2774	chan->conn = hci_conn_get(conn);
2775	skb_queue_head_init(list: &chan->data_q);
2776	chan->state = BT_CONNECTED;
2777
2778	list_add_rcu(new: &chan->list, head: &conn->chan_list);
2779
2780	return chan;
2781	}
2782
2783	void hci_chan_del(struct hci_chan *chan)
2784	{
2785	struct hci_conn *conn = chan->conn;
2786	struct hci_dev *hdev = conn->hdev;
2787
2788	BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2789
2790	list_del_rcu(entry: &chan->list);
2791
2792	synchronize_rcu();
2793
2794	/* Prevent new hci_chan's to be created for this hci_conn */
2795	set_bit(nr: HCI_CONN_DROP, addr: &conn->flags);
2796
2797	hci_conn_put(conn);
2798
2799	skb_queue_purge(list: &chan->data_q);
2800	kfree(objp: chan);
2801	}
2802
2803	void hci_chan_list_flush(struct hci_conn *conn)
2804	{
2805	struct hci_chan *chan, *n;
2806
2807	BT_DBG("hcon %p", conn);
2808
2809	list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2810	hci_chan_del(chan);
2811	}
2812
2813	static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2814	__u16 handle)
2815	{
2816	struct hci_chan *hchan;
2817
2818	list_for_each_entry(hchan, &hcon->chan_list, list) {
2819	if (hchan->handle == handle)
2820	return hchan;
2821	}
2822
2823	return NULL;
2824	}
2825
2826	struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2827	{
2828	struct hci_conn_hash *h = &hdev->conn_hash;
2829	struct hci_conn *hcon;
2830	struct hci_chan *hchan = NULL;
2831
2832	rcu_read_lock();
2833
2834	list_for_each_entry_rcu(hcon, &h->list, list) {
2835	hchan = __hci_chan_lookup_handle(hcon, handle);
2836	if (hchan)
2837	break;
2838	}
2839
2840	rcu_read_unlock();
2841
2842	return hchan;
2843	}
2844
2845	u32 hci_conn_get_phy(struct hci_conn *conn)
2846	{
2847	u32 phys = 0;
2848
2849	/* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2850	* Table 6.2: Packets defined for synchronous, asynchronous, and
2851	* CPB logical transport types.
2852	*/
2853	switch (conn->type) {
2854	case SCO_LINK:
2855	/* SCO logical transport (1 Mb/s):
2856	* HV1, HV2, HV3 and DV.
2857	*/
2858	phys |= BT_PHY_BR_1M_1SLOT;
2859
2860	break;
2861
2862	case ACL_LINK:
2863	/* ACL logical transport (1 Mb/s) ptt=0:
2864	* DH1, DM3, DH3, DM5 and DH5.
2865	*/
2866	phys |= BT_PHY_BR_1M_1SLOT;
2867
2868	if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2869	phys |= BT_PHY_BR_1M_3SLOT;
2870
2871	if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2872	phys |= BT_PHY_BR_1M_5SLOT;
2873
2874	/* ACL logical transport (2 Mb/s) ptt=1:
2875	* 2-DH1, 2-DH3 and 2-DH5.
2876	*/
2877	if (!(conn->pkt_type & HCI_2DH1))
2878	phys |= BT_PHY_EDR_2M_1SLOT;
2879
2880	if (!(conn->pkt_type & HCI_2DH3))
2881	phys |= BT_PHY_EDR_2M_3SLOT;
2882
2883	if (!(conn->pkt_type & HCI_2DH5))
2884	phys |= BT_PHY_EDR_2M_5SLOT;
2885
2886	/* ACL logical transport (3 Mb/s) ptt=1:
2887	* 3-DH1, 3-DH3 and 3-DH5.
2888	*/
2889	if (!(conn->pkt_type & HCI_3DH1))
2890	phys |= BT_PHY_EDR_3M_1SLOT;
2891
2892	if (!(conn->pkt_type & HCI_3DH3))
2893	phys |= BT_PHY_EDR_3M_3SLOT;
2894
2895	if (!(conn->pkt_type & HCI_3DH5))
2896	phys |= BT_PHY_EDR_3M_5SLOT;
2897
2898	break;
2899
2900	case ESCO_LINK:
2901	/* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2902	phys |= BT_PHY_BR_1M_1SLOT;
2903
2904	if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2905	phys |= BT_PHY_BR_1M_3SLOT;
2906
2907	/* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2908	if (!(conn->pkt_type & ESCO_2EV3))
2909	phys |= BT_PHY_EDR_2M_1SLOT;
2910
2911	if (!(conn->pkt_type & ESCO_2EV5))
2912	phys |= BT_PHY_EDR_2M_3SLOT;
2913
2914	/* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2915	if (!(conn->pkt_type & ESCO_3EV3))
2916	phys |= BT_PHY_EDR_3M_1SLOT;
2917
2918	if (!(conn->pkt_type & ESCO_3EV5))
2919	phys |= BT_PHY_EDR_3M_3SLOT;
2920
2921	break;
2922
2923	case LE_LINK:
2924	if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2925	phys |= BT_PHY_LE_1M_TX;
2926
2927	if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2928	phys |= BT_PHY_LE_1M_RX;
2929
2930	if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2931	phys |= BT_PHY_LE_2M_TX;
2932
2933	if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2934	phys |= BT_PHY_LE_2M_RX;
2935
2936	if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2937	phys |= BT_PHY_LE_CODED_TX;
2938
2939	if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2940	phys |= BT_PHY_LE_CODED_RX;
2941
2942	break;
2943	}
2944
2945	return phys;
2946	}
2947
2948	static int abort_conn_sync(struct hci_dev *hdev, void *data)
2949	{
2950	struct hci_conn *conn;
2951	u16 handle = PTR_UINT(data);
2952
2953	conn = hci_conn_hash_lookup_handle(hdev, handle);
2954	if (!conn)
2955	return 0;
2956
2957	return hci_abort_conn_sync(hdev, conn, reason: conn->abort_reason);
2958	}
2959
2960	int hci_abort_conn(struct hci_conn *conn, u8 reason)
2961	{
2962	struct hci_dev *hdev = conn->hdev;
2963
2964	/* If abort_reason has already been set it means the connection is
2965	* already being aborted so don't attempt to overwrite it.
2966	*/
2967	if (conn->abort_reason)
2968	return 0;
2969
2970	bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
2971
2972	conn->abort_reason = reason;
2973
2974	/* If the connection is pending check the command opcode since that
2975	* might be blocking on hci_cmd_sync_work while waiting its respective
2976	* event so we need to hci_cmd_sync_cancel to cancel it.
2977	*
2978	* hci_connect_le serializes the connection attempts so only one
2979	* connection can be in BT_CONNECT at time.
2980	*/
2981	if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
2982	switch (hci_skb_event(hdev->sent_cmd)) {
2983	case HCI_EV_LE_CONN_COMPLETE:
2984	case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
2985	case HCI_EVT_LE_CIS_ESTABLISHED:
2986	hci_cmd_sync_cancel(hdev, err: -ECANCELED);
2987	break;
2988	}
2989	}
2990
2991	return hci_cmd_sync_queue(hdev, func: abort_conn_sync, UINT_PTR(conn->handle),
2992	NULL);
2993	}
2994