2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
25 /* Bluetooth HCI connection handling. */
27 #include <linux/export.h>
28 #include <linux/debugfs.h>
30 #include <net/bluetooth/bluetooth.h>
31 #include <net/bluetooth/hci_core.h>
32 #include <net/bluetooth/l2cap.h>
34 #include "hci_request.h"
45 static const struct sco_param esco_param_cvsd[] = {
46 { (EDR_ESCO_MASK & ~ESCO_2EV3) | SCO_ESCO_MASK | ESCO_EV3,
47 0x000a, 0x01 }, /* S3 */
48 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
49 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
50 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
51 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
54 static const struct sco_param esco_param_cvsd[] = {
55 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
56 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
57 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
58 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
59 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
63 static const struct sco_param sco_param_cvsd[] = {
64 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
65 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
69 static const struct sco_param esco_param_msbc[] = {
70 { (EDR_ESCO_MASK & ~ESCO_2EV3) | ESCO_EV3,
71 0x000d, 0x02 }, /* T2 */
72 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
75 static const struct sco_param esco_param_msbc[] = {
76 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
77 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
81 /* This function requires the caller holds hdev->lock */
82 static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
84 struct hci_conn_params *params;
85 struct hci_dev *hdev = conn->hdev;
91 bdaddr_type = conn->dst_type;
93 /* Check if we need to convert to identity address */
94 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
96 bdaddr = &irk->bdaddr;
97 bdaddr_type = irk->addr_type;
100 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
102 if (!params || !params->explicit_connect)
105 /* The connection attempt was doing scan for new RPA, and is
106 * in scan phase. If params are not associated with any other
107 * autoconnect action, remove them completely. If they are, just unmark
108 * them as waiting for connection, by clearing explicit_connect field.
110 params->explicit_connect = false;
112 list_del_init(¶ms->action);
114 switch (params->auto_connect) {
115 case HCI_AUTO_CONN_EXPLICIT:
116 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
117 /* return instead of break to avoid duplicate scan update */
119 case HCI_AUTO_CONN_DIRECT:
120 case HCI_AUTO_CONN_ALWAYS:
121 list_add(¶ms->action, &hdev->pend_le_conns);
123 case HCI_AUTO_CONN_REPORT:
124 list_add(¶ms->action, &hdev->pend_le_reports);
130 hci_update_background_scan(hdev);
133 static void hci_conn_cleanup(struct hci_conn *conn)
135 struct hci_dev *hdev = conn->hdev;
137 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
138 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
140 hci_chan_list_flush(conn);
142 hci_conn_hash_del(hdev, conn);
144 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
145 switch (conn->setting & SCO_AIRMODE_MASK) {
146 case SCO_AIRMODE_CVSD:
147 case SCO_AIRMODE_TRANSP:
149 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
154 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
157 hci_conn_del_sysfs(conn);
159 debugfs_remove_recursive(conn->debugfs);
166 static void le_scan_cleanup(struct work_struct *work)
168 struct hci_conn *conn = container_of(work, struct hci_conn,
170 struct hci_dev *hdev = conn->hdev;
171 struct hci_conn *c = NULL;
173 BT_DBG("%s hcon %p", hdev->name, conn);
177 /* Check that the hci_conn is still around */
179 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
186 hci_connect_le_scan_cleanup(conn);
187 hci_conn_cleanup(conn);
190 hci_dev_unlock(hdev);
195 static void hci_connect_le_scan_remove(struct hci_conn *conn)
197 BT_DBG("%s hcon %p", conn->hdev->name, conn);
199 /* We can't call hci_conn_del/hci_conn_cleanup here since that
200 * could deadlock with another hci_conn_del() call that's holding
201 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
202 * Instead, grab temporary extra references to the hci_dev and
203 * hci_conn and perform the necessary cleanup in a separate work
207 hci_dev_hold(conn->hdev);
210 /* Even though we hold a reference to the hdev, many other
211 * things might get cleaned up meanwhile, including the hdev's
212 * own workqueue, so we can't use that for scheduling.
214 schedule_work(&conn->le_scan_cleanup);
217 static void hci_acl_create_connection(struct hci_conn *conn)
219 struct hci_dev *hdev = conn->hdev;
220 struct inquiry_entry *ie;
221 struct hci_cp_create_conn cp;
223 BT_DBG("hcon %p", conn);
225 /* Many controllers disallow HCI Create Connection while it is doing
226 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
227 * Connection. This may cause the MGMT discovering state to become false
228 * without user space's request but it is okay since the MGMT Discovery
229 * APIs do not promise that discovery should be done forever. Instead,
230 * the user space monitors the status of MGMT discovering and it may
231 * request for discovery again when this flag becomes false.
233 if (test_bit(HCI_INQUIRY, &hdev->flags)) {
234 /* Put this connection to "pending" state so that it will be
235 * executed after the inquiry cancel command complete event.
237 conn->state = BT_CONNECT2;
238 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
242 conn->state = BT_CONNECT;
244 conn->role = HCI_ROLE_MASTER;
248 conn->link_policy = hdev->link_policy;
250 memset(&cp, 0, sizeof(cp));
251 bacpy(&cp.bdaddr, &conn->dst);
252 cp.pscan_rep_mode = 0x02;
254 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
256 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
257 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
258 cp.pscan_mode = ie->data.pscan_mode;
259 cp.clock_offset = ie->data.clock_offset |
263 memcpy(conn->dev_class, ie->data.dev_class, 3);
266 cp.pkt_type = cpu_to_le16(conn->pkt_type);
267 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
268 cp.role_switch = 0x01;
270 cp.role_switch = 0x00;
272 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
275 int hci_disconnect(struct hci_conn *conn, __u8 reason)
277 BT_DBG("hcon %p", conn);
279 /* When we are central of an established connection and it enters
280 * the disconnect timeout, then go ahead and try to read the
281 * current clock offset. Processing of the result is done
282 * within the event handling and hci_clock_offset_evt function.
284 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
285 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
286 struct hci_dev *hdev = conn->hdev;
287 struct hci_cp_read_clock_offset clkoff_cp;
289 clkoff_cp.handle = cpu_to_le16(conn->handle);
290 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
294 return hci_abort_conn(conn, reason);
297 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
299 struct hci_dev *hdev = conn->hdev;
300 struct hci_cp_add_sco cp;
302 BT_DBG("hcon %p", conn);
304 conn->state = BT_CONNECT;
309 cp.handle = cpu_to_le16(handle);
310 cp.pkt_type = cpu_to_le16(conn->pkt_type);
312 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
315 static bool find_next_esco_param(struct hci_conn *conn,
316 const struct sco_param *esco_param, int size)
318 for (; conn->attempt <= size; conn->attempt++) {
319 if (lmp_esco_2m_capable(conn->link) ||
320 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
322 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
323 conn, conn->attempt);
326 return conn->attempt <= size;
329 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
331 struct hci_dev *hdev = conn->hdev;
332 struct hci_cp_setup_sync_conn cp;
333 const struct sco_param *param;
335 BT_DBG("hcon %p", conn);
337 conn->state = BT_CONNECT;
342 cp.handle = cpu_to_le16(handle);
344 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
345 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
346 cp.voice_setting = cpu_to_le16(conn->setting);
348 switch (conn->setting & SCO_AIRMODE_MASK) {
349 case SCO_AIRMODE_TRANSP:
350 if (!find_next_esco_param(conn, esco_param_msbc,
351 ARRAY_SIZE(esco_param_msbc)))
353 param = &esco_param_msbc[conn->attempt - 1];
355 case SCO_AIRMODE_CVSD:
356 if (lmp_esco_capable(conn->link)) {
357 if (!find_next_esco_param(conn, esco_param_cvsd,
358 ARRAY_SIZE(esco_param_cvsd)))
360 param = &esco_param_cvsd[conn->attempt - 1];
362 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
364 param = &sco_param_cvsd[conn->attempt - 1];
371 cp.retrans_effort = param->retrans_effort;
372 cp.pkt_type = __cpu_to_le16(param->pkt_type);
373 cp.max_latency = __cpu_to_le16(param->max_latency);
375 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
381 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
384 struct hci_dev *hdev = conn->hdev;
385 struct hci_conn_params *params;
386 struct hci_cp_le_conn_update cp;
390 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
392 params->conn_min_interval = min;
393 params->conn_max_interval = max;
394 params->conn_latency = latency;
395 params->supervision_timeout = to_multiplier;
398 hci_dev_unlock(hdev);
400 memset(&cp, 0, sizeof(cp));
401 cp.handle = cpu_to_le16(conn->handle);
402 cp.conn_interval_min = cpu_to_le16(min);
403 cp.conn_interval_max = cpu_to_le16(max);
404 cp.conn_latency = cpu_to_le16(latency);
405 cp.supervision_timeout = cpu_to_le16(to_multiplier);
406 cp.min_ce_len = cpu_to_le16(0x0000);
407 cp.max_ce_len = cpu_to_le16(0x0000);
409 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
417 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
418 __u8 ltk[16], __u8 key_size)
420 struct hci_dev *hdev = conn->hdev;
421 struct hci_cp_le_start_enc cp;
423 BT_DBG("hcon %p", conn);
425 memset(&cp, 0, sizeof(cp));
427 cp.handle = cpu_to_le16(conn->handle);
430 memcpy(cp.ltk, ltk, key_size);
432 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
435 /* Device _must_ be locked */
436 void hci_sco_setup(struct hci_conn *conn, __u8 status)
438 struct hci_conn *sco = conn->link;
443 BT_DBG("hcon %p", conn);
446 if (lmp_esco_capable(conn->hdev))
447 hci_setup_sync(sco, conn->handle);
449 hci_add_sco(sco, conn->handle);
451 hci_connect_cfm(sco, status);
456 static void hci_conn_timeout(struct work_struct *work)
458 struct hci_conn *conn = container_of(work, struct hci_conn,
460 int refcnt = atomic_read(&conn->refcnt);
462 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
466 /* FIXME: It was observed that in pairing failed scenario, refcnt
467 * drops below 0. Probably this is because l2cap_conn_del calls
468 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
469 * dropped. After that loop hci_chan_del is called which also drops
470 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
476 /* LE connections in scanning state need special handling */
477 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
478 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
479 hci_connect_le_scan_remove(conn);
483 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
486 /* Enter sniff mode */
487 static void hci_conn_idle(struct work_struct *work)
489 struct hci_conn *conn = container_of(work, struct hci_conn,
491 struct hci_dev *hdev = conn->hdev;
493 BT_DBG("hcon %p mode %d", conn, conn->mode);
495 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
498 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
501 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
502 struct hci_cp_sniff_subrate cp;
503 cp.handle = cpu_to_le16(conn->handle);
504 cp.max_latency = cpu_to_le16(0);
505 cp.min_remote_timeout = cpu_to_le16(0);
506 cp.min_local_timeout = cpu_to_le16(0);
507 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
510 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
511 struct hci_cp_sniff_mode cp;
512 cp.handle = cpu_to_le16(conn->handle);
513 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
514 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
515 cp.attempt = cpu_to_le16(4);
516 cp.timeout = cpu_to_le16(1);
517 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
521 static void hci_conn_auto_accept(struct work_struct *work)
523 struct hci_conn *conn = container_of(work, struct hci_conn,
524 auto_accept_work.work);
526 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
530 static void le_disable_advertising(struct hci_dev *hdev)
532 if (ext_adv_capable(hdev)) {
533 struct hci_cp_le_set_ext_adv_enable cp;
536 cp.num_of_sets = 0x00;
538 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
542 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
547 static void le_conn_timeout(struct work_struct *work)
549 struct hci_conn *conn = container_of(work, struct hci_conn,
550 le_conn_timeout.work);
551 struct hci_dev *hdev = conn->hdev;
555 /* We could end up here due to having done directed advertising,
556 * so clean up the state if necessary. This should however only
557 * happen with broken hardware or if low duty cycle was used
558 * (which doesn't have a timeout of its own).
560 if (conn->role == HCI_ROLE_SLAVE) {
561 /* Disable LE Advertising */
562 le_disable_advertising(hdev);
564 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
565 hci_dev_unlock(hdev);
569 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
572 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
575 struct hci_conn *conn;
577 BT_DBG("%s dst %pMR", hdev->name, dst);
579 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
583 bacpy(&conn->dst, dst);
584 bacpy(&conn->src, &hdev->bdaddr);
588 conn->mode = HCI_CM_ACTIVE;
589 conn->state = BT_OPEN;
590 conn->auth_type = HCI_AT_GENERAL_BONDING;
591 conn->io_capability = hdev->io_capability;
592 conn->remote_auth = 0xff;
593 conn->key_type = 0xff;
594 conn->rssi = HCI_RSSI_INVALID;
595 conn->tx_power = HCI_TX_POWER_INVALID;
596 conn->max_tx_power = HCI_TX_POWER_INVALID;
599 /* enable sniff mode for incoming connection */
600 conn->link_policy = hdev->link_policy;
603 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
604 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
606 /* Set Default Authenticated payload timeout to 30s */
607 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
609 if (conn->role == HCI_ROLE_MASTER)
614 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
617 /* conn->src should reflect the local identity address */
618 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
621 if (lmp_esco_capable(hdev))
622 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
623 (hdev->esco_type & EDR_ESCO_MASK);
625 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
628 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
632 skb_queue_head_init(&conn->data_q);
634 INIT_LIST_HEAD(&conn->chan_list);
636 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
637 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
638 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
639 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
640 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
642 atomic_set(&conn->refcnt, 0);
646 hci_conn_hash_add(hdev, conn);
648 /* The SCO and eSCO connections will only be notified when their
649 * setup has been completed. This is different to ACL links which
650 * can be notified right away.
652 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
654 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
657 hci_conn_init_sysfs(conn);
662 int hci_conn_del(struct hci_conn *conn)
664 struct hci_dev *hdev = conn->hdev;
666 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
668 cancel_delayed_work_sync(&conn->disc_work);
669 cancel_delayed_work_sync(&conn->auto_accept_work);
670 cancel_delayed_work_sync(&conn->idle_work);
672 if (conn->type == ACL_LINK) {
673 struct hci_conn *sco = conn->link;
678 hdev->acl_cnt += conn->sent;
679 } else if (conn->type == LE_LINK) {
680 cancel_delayed_work(&conn->le_conn_timeout);
683 hdev->le_cnt += conn->sent;
685 hdev->acl_cnt += conn->sent;
687 struct hci_conn *acl = conn->link;
695 amp_mgr_put(conn->amp_mgr);
697 skb_queue_purge(&conn->data_q);
699 /* Remove the connection from the list and cleanup its remaining
700 * state. This is a separate function since for some cases like
701 * BT_CONNECT_SCAN we *only* want the cleanup part without the
702 * rest of hci_conn_del.
704 hci_conn_cleanup(conn);
709 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
711 int use_src = bacmp(src, BDADDR_ANY);
712 struct hci_dev *hdev = NULL, *d;
714 BT_DBG("%pMR -> %pMR", src, dst);
716 read_lock(&hci_dev_list_lock);
718 list_for_each_entry(d, &hci_dev_list, list) {
719 if (!test_bit(HCI_UP, &d->flags) ||
720 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
721 d->dev_type != HCI_PRIMARY)
725 * No source address - find interface with bdaddr != dst
726 * Source address - find interface with bdaddr == src
733 if (src_type == BDADDR_BREDR) {
734 if (!lmp_bredr_capable(d))
736 bacpy(&id_addr, &d->bdaddr);
737 id_addr_type = BDADDR_BREDR;
739 if (!lmp_le_capable(d))
742 hci_copy_identity_address(d, &id_addr,
745 /* Convert from HCI to three-value type */
746 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
747 id_addr_type = BDADDR_LE_PUBLIC;
749 id_addr_type = BDADDR_LE_RANDOM;
752 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
756 if (bacmp(&d->bdaddr, dst)) {
763 hdev = hci_dev_hold(hdev);
765 read_unlock(&hci_dev_list_lock);
768 EXPORT_SYMBOL(hci_get_route);
770 /* This function requires the caller holds hdev->lock */
771 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
773 struct hci_dev *hdev = conn->hdev;
774 struct hci_conn_params *params;
776 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
778 if (params && params->conn) {
779 hci_conn_drop(params->conn);
780 hci_conn_put(params->conn);
784 conn->state = BT_CLOSED;
786 /* If the status indicates successful cancellation of
787 * the attempt (i.e. Unknown Connection Id) there's no point of
788 * notifying failure since we'll go back to keep trying to
789 * connect. The only exception is explicit connect requests
790 * where a timeout + cancel does indicate an actual failure.
792 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
793 (params && params->explicit_connect))
794 mgmt_connect_failed(hdev, &conn->dst, conn->type,
795 conn->dst_type, status);
797 hci_connect_cfm(conn, status);
801 /* The suspend notifier is waiting for all devices to disconnect and an
802 * LE connect cancel will result in an hci_le_conn_failed. Once the last
803 * connection is deleted, we should also wake the suspend queue to
804 * complete suspend operations.
806 if (list_empty(&hdev->conn_hash.list) &&
807 test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
808 wake_up(&hdev->suspend_wait_q);
811 /* Since we may have temporarily stopped the background scanning in
812 * favor of connection establishment, we should restart it.
814 hci_update_background_scan(hdev);
816 /* Re-enable advertising in case this was a failed connection
817 * attempt as a peripheral.
819 hci_req_reenable_advertising(hdev);
822 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
824 struct hci_conn *conn;
828 conn = hci_lookup_le_connect(hdev);
830 if (hdev->adv_instance_cnt)
831 hci_req_resume_adv_instances(hdev);
834 hci_connect_le_scan_cleanup(conn);
838 bt_dev_err(hdev, "request failed to create LE connection: "
839 "status 0x%2.2x", status);
844 hci_le_conn_failed(conn, status);
847 hci_dev_unlock(hdev);
850 static bool conn_use_rpa(struct hci_conn *conn)
852 struct hci_dev *hdev = conn->hdev;
854 return hci_dev_test_flag(hdev, HCI_PRIVACY);
857 static void set_ext_conn_params(struct hci_conn *conn,
858 struct hci_cp_le_ext_conn_param *p)
860 struct hci_dev *hdev = conn->hdev;
862 memset(p, 0, sizeof(*p));
864 p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
865 p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
866 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
867 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
868 p->conn_latency = cpu_to_le16(conn->le_conn_latency);
869 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
870 p->min_ce_len = cpu_to_le16(0x0000);
871 p->max_ce_len = cpu_to_le16(0x0000);
874 static void hci_req_add_le_create_conn(struct hci_request *req,
875 struct hci_conn *conn,
876 bdaddr_t *direct_rpa)
878 struct hci_dev *hdev = conn->hdev;
881 /* If direct address was provided we use it instead of current
885 if (bacmp(&req->hdev->random_addr, direct_rpa))
886 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
889 /* direct address is always RPA */
890 own_addr_type = ADDR_LE_DEV_RANDOM;
892 /* Update random address, but set require_privacy to false so
893 * that we never connect with an non-resolvable address.
895 if (hci_update_random_address(req, false, conn_use_rpa(conn),
900 if (use_ext_conn(hdev)) {
901 struct hci_cp_le_ext_create_conn *cp;
902 struct hci_cp_le_ext_conn_param *p;
903 u8 data[sizeof(*cp) + sizeof(*p) * 3];
907 p = (void *) cp->data;
909 memset(cp, 0, sizeof(*cp));
911 bacpy(&cp->peer_addr, &conn->dst);
912 cp->peer_addr_type = conn->dst_type;
913 cp->own_addr_type = own_addr_type;
918 cp->phys |= LE_SCAN_PHY_1M;
919 set_ext_conn_params(conn, p);
926 cp->phys |= LE_SCAN_PHY_2M;
927 set_ext_conn_params(conn, p);
933 if (scan_coded(hdev)) {
934 cp->phys |= LE_SCAN_PHY_CODED;
935 set_ext_conn_params(conn, p);
940 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
943 struct hci_cp_le_create_conn cp;
945 memset(&cp, 0, sizeof(cp));
947 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
948 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
951 /* LE auto connect */
952 if (!bacmp(&conn->dst, BDADDR_ANY))
953 cp.filter_policy = 0x1;
955 bacpy(&cp.peer_addr, &conn->dst);
957 bacpy(&cp.peer_addr, &conn->dst);
959 cp.peer_addr_type = conn->dst_type;
960 cp.own_address_type = own_addr_type;
961 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
962 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
963 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
964 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
965 cp.min_ce_len = cpu_to_le16(0x0000);
966 cp.max_ce_len = cpu_to_le16(0x0000);
968 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
971 conn->state = BT_CONNECT;
972 clear_bit(HCI_CONN_SCANNING, &conn->flags);
975 static void hci_req_directed_advertising(struct hci_request *req,
976 struct hci_conn *conn)
978 struct hci_dev *hdev = req->hdev;
982 if (ext_adv_capable(hdev)) {
983 struct hci_cp_le_set_ext_adv_params cp;
984 bdaddr_t random_addr;
986 /* Set require_privacy to false so that the remote device has a
987 * chance of identifying us.
989 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
990 &own_addr_type, &random_addr) < 0)
993 memset(&cp, 0, sizeof(cp));
995 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
996 cp.own_addr_type = own_addr_type;
997 cp.channel_map = hdev->le_adv_channel_map;
998 cp.tx_power = HCI_TX_POWER_INVALID;
999 cp.primary_phy = HCI_ADV_PHY_1M;
1000 cp.secondary_phy = HCI_ADV_PHY_1M;
1001 cp.handle = 0; /* Use instance 0 for directed adv */
1002 cp.own_addr_type = own_addr_type;
1003 cp.peer_addr_type = conn->dst_type;
1004 bacpy(&cp.peer_addr, &conn->dst);
1006 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
1007 * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
1008 * does not supports advertising data when the advertising set already
1009 * contains some, the controller shall return erroc code 'Invalid
1010 * HCI Command Parameters(0x12).
1011 * So it is required to remove adv set for handle 0x00. since we use
1012 * instance 0 for directed adv.
1014 __hci_req_remove_ext_adv_instance(req, cp.handle);
1016 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
1018 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
1019 bacmp(&random_addr, BDADDR_ANY) &&
1020 bacmp(&random_addr, &hdev->random_addr)) {
1021 struct hci_cp_le_set_adv_set_rand_addr cp;
1023 memset(&cp, 0, sizeof(cp));
1026 bacpy(&cp.bdaddr, &random_addr);
1029 HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
1033 __hci_req_enable_ext_advertising(req, 0x00);
1035 struct hci_cp_le_set_adv_param cp;
1037 /* Clear the HCI_LE_ADV bit temporarily so that the
1038 * hci_update_random_address knows that it's safe to go ahead
1039 * and write a new random address. The flag will be set back on
1040 * as soon as the SET_ADV_ENABLE HCI command completes.
1042 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1044 /* Set require_privacy to false so that the remote device has a
1045 * chance of identifying us.
1047 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1048 &own_addr_type) < 0)
1051 memset(&cp, 0, sizeof(cp));
1053 /* Some controllers might reject command if intervals are not
1054 * within range for undirected advertising.
1055 * BCM20702A0 is known to be affected by this.
1057 cp.min_interval = cpu_to_le16(0x0020);
1058 cp.max_interval = cpu_to_le16(0x0020);
1060 cp.type = LE_ADV_DIRECT_IND;
1061 cp.own_address_type = own_addr_type;
1062 cp.direct_addr_type = conn->dst_type;
1063 bacpy(&cp.direct_addr, &conn->dst);
1064 cp.channel_map = hdev->le_adv_channel_map;
1066 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1069 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1073 conn->state = BT_CONNECT;
1076 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1077 u8 dst_type, u8 sec_level, u16 conn_timeout,
1078 u8 role, bdaddr_t *direct_rpa)
1080 struct hci_conn_params *params;
1081 struct hci_conn *conn;
1082 struct smp_irk *irk;
1083 struct hci_request req;
1086 /* This ensures that during disable le_scan address resolution
1087 * will not be disabled if it is followed by le_create_conn
1089 bool rpa_le_conn = true;
1091 /* Let's make sure that le is enabled.*/
1092 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1093 if (lmp_le_capable(hdev))
1094 return ERR_PTR(-ECONNREFUSED);
1096 return ERR_PTR(-EOPNOTSUPP);
1099 /* Since the controller supports only one LE connection attempt at a
1100 * time, we return -EBUSY if there is any connection attempt running.
1102 if (hci_lookup_le_connect(hdev))
1103 return ERR_PTR(-EBUSY);
1105 /* If there's already a connection object but it's not in
1106 * scanning state it means it must already be established, in
1107 * which case we can't do anything else except report a failure
1110 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1111 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1112 return ERR_PTR(-EBUSY);
1115 /* When given an identity address with existing identity
1116 * resolving key, the connection needs to be established
1117 * to a resolvable random address.
1119 * Storing the resolvable random address is required here
1120 * to handle connection failures. The address will later
1121 * be resolved back into the original identity address
1122 * from the connect request.
1124 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1125 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1127 dst_type = ADDR_LE_DEV_RANDOM;
1131 bacpy(&conn->dst, dst);
1133 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1135 return ERR_PTR(-ENOMEM);
1136 hci_conn_hold(conn);
1137 conn->pending_sec_level = sec_level;
1140 conn->dst_type = dst_type;
1141 conn->sec_level = BT_SECURITY_LOW;
1142 conn->conn_timeout = conn_timeout;
1144 hci_req_init(&req, hdev);
1146 /* Disable advertising if we're active. For central role
1147 * connections most controllers will refuse to connect if
1148 * advertising is enabled, and for peripheral role connections we
1149 * anyway have to disable it in order to start directed
1150 * advertising. Any registered advertisements will be
1151 * re-enabled after the connection attempt is finished.
1153 if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1154 __hci_req_pause_adv_instances(&req);
1156 /* If requested to connect as peripheral use directed advertising */
1157 if (conn->role == HCI_ROLE_SLAVE) {
1158 /* If we're active scanning most controllers are unable
1159 * to initiate advertising. Simply reject the attempt.
1161 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1162 hdev->le_scan_type == LE_SCAN_ACTIVE) {
1163 hci_req_purge(&req);
1165 return ERR_PTR(-EBUSY);
1168 hci_req_directed_advertising(&req, conn);
1172 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1174 conn->le_conn_min_interval = params->conn_min_interval;
1175 conn->le_conn_max_interval = params->conn_max_interval;
1176 conn->le_conn_latency = params->conn_latency;
1177 conn->le_supv_timeout = params->supervision_timeout;
1179 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1180 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1181 conn->le_conn_latency = hdev->le_conn_latency;
1182 conn->le_supv_timeout = hdev->le_supv_timeout;
1185 /* If controller is scanning, we stop it since some controllers are
1186 * not able to scan and connect at the same time. Also set the
1187 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1188 * handler for scan disabling knows to set the correct discovery
1191 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1192 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1193 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1196 hci_req_add_le_create_conn(&req, conn, direct_rpa);
1199 err = hci_req_run(&req, create_le_conn_complete);
1203 if (hdev->adv_instance_cnt)
1204 hci_req_resume_adv_instances(hdev);
1206 return ERR_PTR(err);
1212 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1214 struct hci_conn *conn;
1216 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1220 if (conn->state != BT_CONNECTED)
1226 /* This function requires the caller holds hdev->lock */
1227 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1228 bdaddr_t *addr, u8 addr_type)
1230 struct hci_conn_params *params;
1232 if (is_connected(hdev, addr, addr_type))
1235 params = hci_conn_params_lookup(hdev, addr, addr_type);
1237 params = hci_conn_params_add(hdev, addr, addr_type);
1241 /* If we created new params, mark them to be deleted in
1242 * hci_connect_le_scan_cleanup. It's different case than
1243 * existing disabled params, those will stay after cleanup.
1245 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1248 /* We're trying to connect, so make sure params are at pend_le_conns */
1249 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1250 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1251 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1252 list_del_init(¶ms->action);
1253 list_add(¶ms->action, &hdev->pend_le_conns);
1256 params->explicit_connect = true;
1258 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1259 params->auto_connect);
1264 /* This function requires the caller holds hdev->lock */
1265 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1266 u8 dst_type, u8 sec_level,
1268 enum conn_reasons conn_reason)
1270 struct hci_conn *conn;
1272 /* Let's make sure that le is enabled.*/
1273 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1274 if (lmp_le_capable(hdev))
1275 return ERR_PTR(-ECONNREFUSED);
1277 return ERR_PTR(-EOPNOTSUPP);
1280 /* Some devices send ATT messages as soon as the physical link is
1281 * established. To be able to handle these ATT messages, the user-
1282 * space first establishes the connection and then starts the pairing
1285 * So if a hci_conn object already exists for the following connection
1286 * attempt, we simply update pending_sec_level and auth_type fields
1287 * and return the object found.
1289 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1291 if (conn->pending_sec_level < sec_level)
1292 conn->pending_sec_level = sec_level;
1296 BT_DBG("requesting refresh of dst_addr");
1298 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1300 return ERR_PTR(-ENOMEM);
1302 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1304 return ERR_PTR(-EBUSY);
1307 conn->state = BT_CONNECT;
1308 set_bit(HCI_CONN_SCANNING, &conn->flags);
1309 conn->dst_type = dst_type;
1310 conn->sec_level = BT_SECURITY_LOW;
1311 conn->pending_sec_level = sec_level;
1312 conn->conn_timeout = conn_timeout;
1313 conn->conn_reason = conn_reason;
1315 hci_update_background_scan(hdev);
1318 hci_conn_hold(conn);
1322 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1323 u8 sec_level, u8 auth_type,
1324 enum conn_reasons conn_reason)
1326 struct hci_conn *acl;
1328 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1329 if (lmp_bredr_capable(hdev))
1330 return ERR_PTR(-ECONNREFUSED);
1332 return ERR_PTR(-EOPNOTSUPP);
1335 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1337 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1339 return ERR_PTR(-ENOMEM);
1344 acl->conn_reason = conn_reason;
1345 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1346 acl->sec_level = BT_SECURITY_LOW;
1347 acl->pending_sec_level = sec_level;
1348 acl->auth_type = auth_type;
1349 hci_acl_create_connection(acl);
1355 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1358 struct hci_conn *acl;
1359 struct hci_conn *sco;
1361 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1362 CONN_REASON_SCO_CONNECT);
1366 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1368 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1371 return ERR_PTR(-ENOMEM);
1380 sco->setting = setting;
1382 if (acl->state == BT_CONNECTED &&
1383 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1384 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1385 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1387 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1388 /* defer SCO setup until mode change completed */
1389 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1393 hci_sco_setup(acl, 0x00);
1399 /* Check link security requirement */
1400 int hci_conn_check_link_mode(struct hci_conn *conn)
1402 BT_DBG("hcon %p", conn);
1404 /* In Secure Connections Only mode, it is required that Secure
1405 * Connections is used and the link is encrypted with AES-CCM
1406 * using a P-256 authenticated combination key.
1408 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1409 if (!hci_conn_sc_enabled(conn) ||
1410 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1411 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1415 /* AES encryption is required for Level 4:
1417 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1420 * 128-bit equivalent strength for link and encryption keys
1421 * required using FIPS approved algorithms (E0 not allowed,
1422 * SAFER+ not allowed, and P-192 not allowed; encryption key
1425 if (conn->sec_level == BT_SECURITY_FIPS &&
1426 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1427 bt_dev_err(conn->hdev,
1428 "Invalid security: Missing AES-CCM usage");
1432 if (hci_conn_ssp_enabled(conn) &&
1433 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1439 /* Authenticate remote device */
1440 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1442 BT_DBG("hcon %p", conn);
1444 if (conn->pending_sec_level > sec_level)
1445 sec_level = conn->pending_sec_level;
1447 if (sec_level > conn->sec_level)
1448 conn->pending_sec_level = sec_level;
1449 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1452 /* Make sure we preserve an existing MITM requirement*/
1453 auth_type |= (conn->auth_type & 0x01);
1455 conn->auth_type = auth_type;
1457 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1458 struct hci_cp_auth_requested cp;
1460 cp.handle = cpu_to_le16(conn->handle);
1461 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1464 /* If we're already encrypted set the REAUTH_PEND flag,
1465 * otherwise set the ENCRYPT_PEND.
1467 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1468 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1470 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1476 /* Encrypt the link */
1477 static void hci_conn_encrypt(struct hci_conn *conn)
1479 BT_DBG("hcon %p", conn);
1481 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1482 struct hci_cp_set_conn_encrypt cp;
1483 cp.handle = cpu_to_le16(conn->handle);
1485 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1490 /* Enable security */
1491 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1494 BT_DBG("hcon %p", conn);
1496 if (conn->type == LE_LINK)
1497 return smp_conn_security(conn, sec_level);
1499 /* For sdp we don't need the link key. */
1500 if (sec_level == BT_SECURITY_SDP)
1503 /* For non 2.1 devices and low security level we don't need the link
1505 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1508 /* For other security levels we need the link key. */
1509 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1512 /* An authenticated FIPS approved combination key has sufficient
1513 * security for security level 4. */
1514 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1515 sec_level == BT_SECURITY_FIPS)
1518 /* An authenticated combination key has sufficient security for
1519 security level 3. */
1520 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1521 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1522 sec_level == BT_SECURITY_HIGH)
1525 /* An unauthenticated combination key has sufficient security for
1526 security level 1 and 2. */
1527 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1528 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1529 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1532 /* A combination key has always sufficient security for the security
1533 levels 1 or 2. High security level requires the combination key
1534 is generated using maximum PIN code length (16).
1535 For pre 2.1 units. */
1536 if (conn->key_type == HCI_LK_COMBINATION &&
1537 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1538 conn->pin_length == 16))
1542 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1546 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1548 if (!hci_conn_auth(conn, sec_level, auth_type))
1552 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1553 /* Ensure that the encryption key size has been read,
1554 * otherwise stall the upper layer responses.
1556 if (!conn->enc_key_size)
1559 /* Nothing else needed, all requirements are met */
1563 hci_conn_encrypt(conn);
1566 EXPORT_SYMBOL(hci_conn_security);
1568 /* Check secure link requirement */
1569 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1571 BT_DBG("hcon %p", conn);
1573 /* Accept if non-secure or higher security level is required */
1574 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1577 /* Accept if secure or higher security level is already present */
1578 if (conn->sec_level == BT_SECURITY_HIGH ||
1579 conn->sec_level == BT_SECURITY_FIPS)
1582 /* Reject not secure link */
1585 EXPORT_SYMBOL(hci_conn_check_secure);
1588 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1590 BT_DBG("hcon %p", conn);
1592 if (role == conn->role)
1595 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1596 struct hci_cp_switch_role cp;
1597 bacpy(&cp.bdaddr, &conn->dst);
1599 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1604 EXPORT_SYMBOL(hci_conn_switch_role);
1607 int hci_conn_change_supervision_timeout(struct hci_conn *conn, __u16 timeout)
1609 struct hci_cp_write_link_supervision_timeout cp;
1611 if (!((get_link_mode(conn)) & HCI_LM_MASTER))
1614 if (conn->handle == 0)
1617 memset(&cp, 0, sizeof(cp));
1618 cp.handle = cpu_to_le16(conn->handle);
1619 cp.timeout = cpu_to_le16(timeout);
1621 if (hci_send_cmd(conn->hdev, HCI_OP_WRITE_LINK_SUPERVISION_TIMEOUT,
1622 sizeof(cp), &cp) < 0)
1623 BT_ERR("HCI_OP_WRITE_LINK_SUPERVISION_TIMEOUT is failed");
1629 /* Enter active mode */
1630 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1632 struct hci_dev *hdev = conn->hdev;
1634 BT_DBG("hcon %p mode %d", conn, conn->mode);
1636 if (conn->mode != HCI_CM_SNIFF)
1639 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1642 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1643 struct hci_cp_exit_sniff_mode cp;
1644 cp.handle = cpu_to_le16(conn->handle);
1645 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1650 if (hdev->idle_timeout > 0) {
1651 /* Sniff timer cancel */
1652 cancel_delayed_work(&conn->idle_work);
1653 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1654 msecs_to_jiffies(hdev->idle_timeout));
1657 if (hdev->idle_timeout > 0)
1658 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1659 msecs_to_jiffies(hdev->idle_timeout));
1663 /* Drop all connection on the device */
1664 void hci_conn_hash_flush(struct hci_dev *hdev)
1666 struct hci_conn_hash *h = &hdev->conn_hash;
1667 struct hci_conn *c, *n;
1669 BT_DBG("hdev %s", hdev->name);
1671 list_for_each_entry_safe(c, n, &h->list, list) {
1672 c->state = BT_CLOSED;
1674 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1679 /* Check pending connect attempts */
1680 void hci_conn_check_pending(struct hci_dev *hdev)
1682 struct hci_conn *conn;
1684 BT_DBG("hdev %s", hdev->name);
1688 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1690 hci_acl_create_connection(conn);
1692 hci_dev_unlock(hdev);
1696 static u32 get_link_mode(struct hci_conn *conn)
1698 u32 get_link_mode(struct hci_conn *conn)
1703 if (conn->role == HCI_ROLE_MASTER)
1704 link_mode |= HCI_LM_MASTER;
1706 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1707 link_mode |= HCI_LM_ENCRYPT;
1709 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1710 link_mode |= HCI_LM_AUTH;
1712 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1713 link_mode |= HCI_LM_SECURE;
1715 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1716 link_mode |= HCI_LM_FIPS;
1721 int hci_get_conn_list(void __user *arg)
1724 struct hci_conn_list_req req, *cl;
1725 struct hci_conn_info *ci;
1726 struct hci_dev *hdev;
1727 int n = 0, size, err;
1729 if (copy_from_user(&req, arg, sizeof(req)))
1732 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1735 size = sizeof(req) + req.conn_num * sizeof(*ci);
1737 cl = kmalloc(size, GFP_KERNEL);
1741 hdev = hci_dev_get(req.dev_id);
1750 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1751 bacpy(&(ci + n)->bdaddr, &c->dst);
1752 (ci + n)->handle = c->handle;
1753 (ci + n)->type = c->type;
1754 (ci + n)->out = c->out;
1755 (ci + n)->state = c->state;
1756 (ci + n)->link_mode = get_link_mode(c);
1757 if (++n >= req.conn_num)
1760 hci_dev_unlock(hdev);
1762 cl->dev_id = hdev->id;
1764 size = sizeof(req) + n * sizeof(*ci);
1768 err = copy_to_user(arg, cl, size);
1771 return err ? -EFAULT : 0;
1774 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1776 struct hci_conn_info_req req;
1777 struct hci_conn_info ci;
1778 struct hci_conn *conn;
1779 char __user *ptr = arg + sizeof(req);
1781 if (copy_from_user(&req, arg, sizeof(req)))
1785 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1787 bacpy(&ci.bdaddr, &conn->dst);
1788 ci.handle = conn->handle;
1789 ci.type = conn->type;
1791 ci.state = conn->state;
1792 ci.link_mode = get_link_mode(conn);
1794 hci_dev_unlock(hdev);
1799 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1802 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1804 struct hci_auth_info_req req;
1805 struct hci_conn *conn;
1807 if (copy_from_user(&req, arg, sizeof(req)))
1811 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1813 req.type = conn->auth_type;
1814 hci_dev_unlock(hdev);
1819 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1822 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1824 struct hci_dev *hdev = conn->hdev;
1825 struct hci_chan *chan;
1827 BT_DBG("%s hcon %p", hdev->name, conn);
1829 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1830 BT_DBG("Refusing to create new hci_chan");
1834 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1838 chan->conn = hci_conn_get(conn);
1839 skb_queue_head_init(&chan->data_q);
1840 chan->state = BT_CONNECTED;
1842 list_add_rcu(&chan->list, &conn->chan_list);
1847 void hci_chan_del(struct hci_chan *chan)
1849 struct hci_conn *conn = chan->conn;
1850 struct hci_dev *hdev = conn->hdev;
1852 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1854 list_del_rcu(&chan->list);
1858 /* Prevent new hci_chan's to be created for this hci_conn */
1859 set_bit(HCI_CONN_DROP, &conn->flags);
1863 skb_queue_purge(&chan->data_q);
1867 void hci_chan_list_flush(struct hci_conn *conn)
1869 struct hci_chan *chan, *n;
1871 BT_DBG("hcon %p", conn);
1873 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1877 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1880 struct hci_chan *hchan;
1882 list_for_each_entry(hchan, &hcon->chan_list, list) {
1883 if (hchan->handle == handle)
1890 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1892 struct hci_conn_hash *h = &hdev->conn_hash;
1893 struct hci_conn *hcon;
1894 struct hci_chan *hchan = NULL;
1898 list_for_each_entry_rcu(hcon, &h->list, list) {
1899 hchan = __hci_chan_lookup_handle(hcon, handle);
1909 u32 hci_conn_get_phy(struct hci_conn *conn)
1913 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1914 * Table 6.2: Packets defined for synchronous, asynchronous, and
1915 * CPB logical transport types.
1917 switch (conn->type) {
1919 /* SCO logical transport (1 Mb/s):
1920 * HV1, HV2, HV3 and DV.
1922 phys |= BT_PHY_BR_1M_1SLOT;
1927 /* ACL logical transport (1 Mb/s) ptt=0:
1928 * DH1, DM3, DH3, DM5 and DH5.
1930 phys |= BT_PHY_BR_1M_1SLOT;
1932 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1933 phys |= BT_PHY_BR_1M_3SLOT;
1935 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1936 phys |= BT_PHY_BR_1M_5SLOT;
1938 /* ACL logical transport (2 Mb/s) ptt=1:
1939 * 2-DH1, 2-DH3 and 2-DH5.
1941 if (!(conn->pkt_type & HCI_2DH1))
1942 phys |= BT_PHY_EDR_2M_1SLOT;
1944 if (!(conn->pkt_type & HCI_2DH3))
1945 phys |= BT_PHY_EDR_2M_3SLOT;
1947 if (!(conn->pkt_type & HCI_2DH5))
1948 phys |= BT_PHY_EDR_2M_5SLOT;
1950 /* ACL logical transport (3 Mb/s) ptt=1:
1951 * 3-DH1, 3-DH3 and 3-DH5.
1953 if (!(conn->pkt_type & HCI_3DH1))
1954 phys |= BT_PHY_EDR_3M_1SLOT;
1956 if (!(conn->pkt_type & HCI_3DH3))
1957 phys |= BT_PHY_EDR_3M_3SLOT;
1959 if (!(conn->pkt_type & HCI_3DH5))
1960 phys |= BT_PHY_EDR_3M_5SLOT;
1965 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1966 phys |= BT_PHY_BR_1M_1SLOT;
1968 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1969 phys |= BT_PHY_BR_1M_3SLOT;
1971 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1972 if (!(conn->pkt_type & ESCO_2EV3))
1973 phys |= BT_PHY_EDR_2M_1SLOT;
1975 if (!(conn->pkt_type & ESCO_2EV5))
1976 phys |= BT_PHY_EDR_2M_3SLOT;
1978 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1979 if (!(conn->pkt_type & ESCO_3EV3))
1980 phys |= BT_PHY_EDR_3M_1SLOT;
1982 if (!(conn->pkt_type & ESCO_3EV5))
1983 phys |= BT_PHY_EDR_3M_3SLOT;
1988 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1989 phys |= BT_PHY_LE_1M_TX;
1991 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1992 phys |= BT_PHY_LE_1M_RX;
1994 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1995 phys |= BT_PHY_LE_2M_TX;
1997 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1998 phys |= BT_PHY_LE_2M_RX;
2000 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2001 phys |= BT_PHY_LE_CODED_TX;
2003 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2004 phys |= BT_PHY_LE_CODED_RX;