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"
44 static const struct sco_param esco_param_cvsd[] = {
45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
52 static const struct sco_param sco_param_cvsd[] = {
53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
57 static const struct sco_param esco_param_msbc[] = {
58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
62 /* This function requires the caller holds hdev->lock */
63 static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
65 struct hci_conn_params *params;
66 struct hci_dev *hdev = conn->hdev;
72 bdaddr_type = conn->dst_type;
74 /* Check if we need to convert to identity address */
75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
77 bdaddr = &irk->bdaddr;
78 bdaddr_type = irk->addr_type;
81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
83 if (!params || !params->explicit_connect)
86 /* The connection attempt was doing scan for new RPA, and is
87 * in scan phase. If params are not associated with any other
88 * autoconnect action, remove them completely. If they are, just unmark
89 * them as waiting for connection, by clearing explicit_connect field.
91 params->explicit_connect = false;
93 list_del_init(¶ms->action);
95 switch (params->auto_connect) {
96 case HCI_AUTO_CONN_EXPLICIT:
97 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
98 /* return instead of break to avoid duplicate scan update */
100 case HCI_AUTO_CONN_DIRECT:
101 case HCI_AUTO_CONN_ALWAYS:
102 list_add(¶ms->action, &hdev->pend_le_conns);
104 case HCI_AUTO_CONN_REPORT:
105 list_add(¶ms->action, &hdev->pend_le_reports);
111 hci_update_background_scan(hdev);
114 static void hci_conn_cleanup(struct hci_conn *conn)
116 struct hci_dev *hdev = conn->hdev;
118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
121 hci_chan_list_flush(conn);
123 hci_conn_hash_del(hdev, conn);
125 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
126 switch (conn->setting & SCO_AIRMODE_MASK) {
127 case SCO_AIRMODE_CVSD:
128 case SCO_AIRMODE_TRANSP:
130 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
135 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
138 hci_conn_del_sysfs(conn);
140 debugfs_remove_recursive(conn->debugfs);
147 static void le_scan_cleanup(struct work_struct *work)
149 struct hci_conn *conn = container_of(work, struct hci_conn,
151 struct hci_dev *hdev = conn->hdev;
152 struct hci_conn *c = NULL;
154 BT_DBG("%s hcon %p", hdev->name, conn);
158 /* Check that the hci_conn is still around */
160 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
167 hci_connect_le_scan_cleanup(conn);
168 hci_conn_cleanup(conn);
171 hci_dev_unlock(hdev);
176 static void hci_connect_le_scan_remove(struct hci_conn *conn)
178 BT_DBG("%s hcon %p", conn->hdev->name, conn);
180 /* We can't call hci_conn_del/hci_conn_cleanup here since that
181 * could deadlock with another hci_conn_del() call that's holding
182 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
183 * Instead, grab temporary extra references to the hci_dev and
184 * hci_conn and perform the necessary cleanup in a separate work
188 hci_dev_hold(conn->hdev);
191 /* Even though we hold a reference to the hdev, many other
192 * things might get cleaned up meanwhile, including the hdev's
193 * own workqueue, so we can't use that for scheduling.
195 schedule_work(&conn->le_scan_cleanup);
198 static void hci_acl_create_connection(struct hci_conn *conn)
200 struct hci_dev *hdev = conn->hdev;
201 struct inquiry_entry *ie;
202 struct hci_cp_create_conn cp;
204 BT_DBG("hcon %p", conn);
206 /* Many controllers disallow HCI Create Connection while it is doing
207 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
208 * Connection. This may cause the MGMT discovering state to become false
209 * without user space's request but it is okay since the MGMT Discovery
210 * APIs do not promise that discovery should be done forever. Instead,
211 * the user space monitors the status of MGMT discovering and it may
212 * request for discovery again when this flag becomes false.
214 if (test_bit(HCI_INQUIRY, &hdev->flags)) {
215 /* Put this connection to "pending" state so that it will be
216 * executed after the inquiry cancel command complete event.
218 conn->state = BT_CONNECT2;
219 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
223 conn->state = BT_CONNECT;
225 conn->role = HCI_ROLE_MASTER;
229 conn->link_policy = hdev->link_policy;
231 memset(&cp, 0, sizeof(cp));
232 bacpy(&cp.bdaddr, &conn->dst);
233 cp.pscan_rep_mode = 0x02;
235 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
237 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
238 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
239 cp.pscan_mode = ie->data.pscan_mode;
240 cp.clock_offset = ie->data.clock_offset |
244 memcpy(conn->dev_class, ie->data.dev_class, 3);
247 cp.pkt_type = cpu_to_le16(conn->pkt_type);
248 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
249 cp.role_switch = 0x01;
251 cp.role_switch = 0x00;
253 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
256 int hci_disconnect(struct hci_conn *conn, __u8 reason)
258 BT_DBG("hcon %p", conn);
260 /* When we are central of an established connection and it enters
261 * the disconnect timeout, then go ahead and try to read the
262 * current clock offset. Processing of the result is done
263 * within the event handling and hci_clock_offset_evt function.
265 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
266 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
267 struct hci_dev *hdev = conn->hdev;
268 struct hci_cp_read_clock_offset clkoff_cp;
270 clkoff_cp.handle = cpu_to_le16(conn->handle);
271 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
275 return hci_abort_conn(conn, reason);
278 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
280 struct hci_dev *hdev = conn->hdev;
281 struct hci_cp_add_sco cp;
283 BT_DBG("hcon %p", conn);
285 conn->state = BT_CONNECT;
290 cp.handle = cpu_to_le16(handle);
291 cp.pkt_type = cpu_to_le16(conn->pkt_type);
293 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
296 static bool find_next_esco_param(struct hci_conn *conn,
297 const struct sco_param *esco_param, int size)
299 for (; conn->attempt <= size; conn->attempt++) {
300 if (lmp_esco_2m_capable(conn->link) ||
301 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
303 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
304 conn, conn->attempt);
307 return conn->attempt <= size;
310 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
312 struct hci_dev *hdev = conn->hdev;
313 struct hci_cp_setup_sync_conn cp;
314 const struct sco_param *param;
316 BT_DBG("hcon %p", conn);
318 conn->state = BT_CONNECT;
323 cp.handle = cpu_to_le16(handle);
325 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
326 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
327 cp.voice_setting = cpu_to_le16(conn->setting);
329 switch (conn->setting & SCO_AIRMODE_MASK) {
330 case SCO_AIRMODE_TRANSP:
331 if (!find_next_esco_param(conn, esco_param_msbc,
332 ARRAY_SIZE(esco_param_msbc)))
334 param = &esco_param_msbc[conn->attempt - 1];
336 case SCO_AIRMODE_CVSD:
337 if (lmp_esco_capable(conn->link)) {
338 if (!find_next_esco_param(conn, esco_param_cvsd,
339 ARRAY_SIZE(esco_param_cvsd)))
341 param = &esco_param_cvsd[conn->attempt - 1];
343 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
345 param = &sco_param_cvsd[conn->attempt - 1];
352 cp.retrans_effort = param->retrans_effort;
353 cp.pkt_type = __cpu_to_le16(param->pkt_type);
354 cp.max_latency = __cpu_to_le16(param->max_latency);
356 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
362 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
365 struct hci_dev *hdev = conn->hdev;
366 struct hci_conn_params *params;
367 struct hci_cp_le_conn_update cp;
371 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
373 params->conn_min_interval = min;
374 params->conn_max_interval = max;
375 params->conn_latency = latency;
376 params->supervision_timeout = to_multiplier;
379 hci_dev_unlock(hdev);
381 memset(&cp, 0, sizeof(cp));
382 cp.handle = cpu_to_le16(conn->handle);
383 cp.conn_interval_min = cpu_to_le16(min);
384 cp.conn_interval_max = cpu_to_le16(max);
385 cp.conn_latency = cpu_to_le16(latency);
386 cp.supervision_timeout = cpu_to_le16(to_multiplier);
387 cp.min_ce_len = cpu_to_le16(0x0000);
388 cp.max_ce_len = cpu_to_le16(0x0000);
390 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
398 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
399 __u8 ltk[16], __u8 key_size)
401 struct hci_dev *hdev = conn->hdev;
402 struct hci_cp_le_start_enc cp;
404 BT_DBG("hcon %p", conn);
406 memset(&cp, 0, sizeof(cp));
408 cp.handle = cpu_to_le16(conn->handle);
411 memcpy(cp.ltk, ltk, key_size);
413 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
416 /* Device _must_ be locked */
417 void hci_sco_setup(struct hci_conn *conn, __u8 status)
419 struct hci_conn *sco = conn->link;
424 BT_DBG("hcon %p", conn);
427 if (lmp_esco_capable(conn->hdev))
428 hci_setup_sync(sco, conn->handle);
430 hci_add_sco(sco, conn->handle);
432 hci_connect_cfm(sco, status);
437 static void hci_conn_timeout(struct work_struct *work)
439 struct hci_conn *conn = container_of(work, struct hci_conn,
441 int refcnt = atomic_read(&conn->refcnt);
443 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
447 /* FIXME: It was observed that in pairing failed scenario, refcnt
448 * drops below 0. Probably this is because l2cap_conn_del calls
449 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
450 * dropped. After that loop hci_chan_del is called which also drops
451 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
457 /* LE connections in scanning state need special handling */
458 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
459 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
460 hci_connect_le_scan_remove(conn);
464 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
467 /* Enter sniff mode */
468 static void hci_conn_idle(struct work_struct *work)
470 struct hci_conn *conn = container_of(work, struct hci_conn,
472 struct hci_dev *hdev = conn->hdev;
474 BT_DBG("hcon %p mode %d", conn, conn->mode);
476 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
479 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
482 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
483 struct hci_cp_sniff_subrate cp;
484 cp.handle = cpu_to_le16(conn->handle);
485 cp.max_latency = cpu_to_le16(0);
486 cp.min_remote_timeout = cpu_to_le16(0);
487 cp.min_local_timeout = cpu_to_le16(0);
488 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
491 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
492 struct hci_cp_sniff_mode cp;
493 cp.handle = cpu_to_le16(conn->handle);
494 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
495 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
496 cp.attempt = cpu_to_le16(4);
497 cp.timeout = cpu_to_le16(1);
498 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
502 static void hci_conn_auto_accept(struct work_struct *work)
504 struct hci_conn *conn = container_of(work, struct hci_conn,
505 auto_accept_work.work);
507 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
511 static void le_disable_advertising(struct hci_dev *hdev)
513 if (ext_adv_capable(hdev)) {
514 struct hci_cp_le_set_ext_adv_enable cp;
517 cp.num_of_sets = 0x00;
519 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
523 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
528 static void le_conn_timeout(struct work_struct *work)
530 struct hci_conn *conn = container_of(work, struct hci_conn,
531 le_conn_timeout.work);
532 struct hci_dev *hdev = conn->hdev;
536 /* We could end up here due to having done directed advertising,
537 * so clean up the state if necessary. This should however only
538 * happen with broken hardware or if low duty cycle was used
539 * (which doesn't have a timeout of its own).
541 if (conn->role == HCI_ROLE_SLAVE) {
542 /* Disable LE Advertising */
543 le_disable_advertising(hdev);
545 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
546 hci_dev_unlock(hdev);
550 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
553 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
556 struct hci_conn *conn;
558 BT_DBG("%s dst %pMR", hdev->name, dst);
560 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
564 bacpy(&conn->dst, dst);
565 bacpy(&conn->src, &hdev->bdaddr);
569 conn->mode = HCI_CM_ACTIVE;
570 conn->state = BT_OPEN;
571 conn->auth_type = HCI_AT_GENERAL_BONDING;
572 conn->io_capability = hdev->io_capability;
573 conn->remote_auth = 0xff;
574 conn->key_type = 0xff;
575 conn->rssi = HCI_RSSI_INVALID;
576 conn->tx_power = HCI_TX_POWER_INVALID;
577 conn->max_tx_power = HCI_TX_POWER_INVALID;
579 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
580 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
582 /* Set Default Authenticated payload timeout to 30s */
583 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
585 if (conn->role == HCI_ROLE_MASTER)
590 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
593 /* conn->src should reflect the local identity address */
594 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
597 if (lmp_esco_capable(hdev))
598 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
599 (hdev->esco_type & EDR_ESCO_MASK);
601 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
604 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
608 skb_queue_head_init(&conn->data_q);
610 INIT_LIST_HEAD(&conn->chan_list);
612 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
613 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
614 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
615 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
616 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
618 atomic_set(&conn->refcnt, 0);
622 hci_conn_hash_add(hdev, conn);
624 /* The SCO and eSCO connections will only be notified when their
625 * setup has been completed. This is different to ACL links which
626 * can be notified right away.
628 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
630 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
633 hci_conn_init_sysfs(conn);
638 int hci_conn_del(struct hci_conn *conn)
640 struct hci_dev *hdev = conn->hdev;
642 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
644 cancel_delayed_work_sync(&conn->disc_work);
645 cancel_delayed_work_sync(&conn->auto_accept_work);
646 cancel_delayed_work_sync(&conn->idle_work);
648 if (conn->type == ACL_LINK) {
649 struct hci_conn *sco = conn->link;
654 hdev->acl_cnt += conn->sent;
655 } else if (conn->type == LE_LINK) {
656 cancel_delayed_work(&conn->le_conn_timeout);
659 hdev->le_cnt += conn->sent;
661 hdev->acl_cnt += conn->sent;
663 struct hci_conn *acl = conn->link;
671 amp_mgr_put(conn->amp_mgr);
673 skb_queue_purge(&conn->data_q);
675 /* Remove the connection from the list and cleanup its remaining
676 * state. This is a separate function since for some cases like
677 * BT_CONNECT_SCAN we *only* want the cleanup part without the
678 * rest of hci_conn_del.
680 hci_conn_cleanup(conn);
685 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
687 int use_src = bacmp(src, BDADDR_ANY);
688 struct hci_dev *hdev = NULL, *d;
690 BT_DBG("%pMR -> %pMR", src, dst);
692 read_lock(&hci_dev_list_lock);
694 list_for_each_entry(d, &hci_dev_list, list) {
695 if (!test_bit(HCI_UP, &d->flags) ||
696 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
697 d->dev_type != HCI_PRIMARY)
701 * No source address - find interface with bdaddr != dst
702 * Source address - find interface with bdaddr == src
709 if (src_type == BDADDR_BREDR) {
710 if (!lmp_bredr_capable(d))
712 bacpy(&id_addr, &d->bdaddr);
713 id_addr_type = BDADDR_BREDR;
715 if (!lmp_le_capable(d))
718 hci_copy_identity_address(d, &id_addr,
721 /* Convert from HCI to three-value type */
722 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
723 id_addr_type = BDADDR_LE_PUBLIC;
725 id_addr_type = BDADDR_LE_RANDOM;
728 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
732 if (bacmp(&d->bdaddr, dst)) {
739 hdev = hci_dev_hold(hdev);
741 read_unlock(&hci_dev_list_lock);
744 EXPORT_SYMBOL(hci_get_route);
746 /* This function requires the caller holds hdev->lock */
747 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
749 struct hci_dev *hdev = conn->hdev;
750 struct hci_conn_params *params;
752 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
754 if (params && params->conn) {
755 hci_conn_drop(params->conn);
756 hci_conn_put(params->conn);
760 conn->state = BT_CLOSED;
762 /* If the status indicates successful cancellation of
763 * the attempt (i.e. Unknown Connection Id) there's no point of
764 * notifying failure since we'll go back to keep trying to
765 * connect. The only exception is explicit connect requests
766 * where a timeout + cancel does indicate an actual failure.
768 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
769 (params && params->explicit_connect))
770 mgmt_connect_failed(hdev, &conn->dst, conn->type,
771 conn->dst_type, status);
773 hci_connect_cfm(conn, status);
777 /* The suspend notifier is waiting for all devices to disconnect and an
778 * LE connect cancel will result in an hci_le_conn_failed. Once the last
779 * connection is deleted, we should also wake the suspend queue to
780 * complete suspend operations.
782 if (list_empty(&hdev->conn_hash.list) &&
783 test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
784 wake_up(&hdev->suspend_wait_q);
787 /* Since we may have temporarily stopped the background scanning in
788 * favor of connection establishment, we should restart it.
790 hci_update_background_scan(hdev);
792 /* Re-enable advertising in case this was a failed connection
793 * attempt as a peripheral.
795 hci_req_reenable_advertising(hdev);
798 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
800 struct hci_conn *conn;
804 conn = hci_lookup_le_connect(hdev);
806 if (hdev->adv_instance_cnt)
807 hci_req_resume_adv_instances(hdev);
810 hci_connect_le_scan_cleanup(conn);
814 bt_dev_err(hdev, "request failed to create LE connection: "
815 "status 0x%2.2x", status);
820 hci_le_conn_failed(conn, status);
823 hci_dev_unlock(hdev);
826 static bool conn_use_rpa(struct hci_conn *conn)
828 struct hci_dev *hdev = conn->hdev;
830 return hci_dev_test_flag(hdev, HCI_PRIVACY);
833 static void set_ext_conn_params(struct hci_conn *conn,
834 struct hci_cp_le_ext_conn_param *p)
836 struct hci_dev *hdev = conn->hdev;
838 memset(p, 0, sizeof(*p));
840 p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
841 p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
842 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
843 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
844 p->conn_latency = cpu_to_le16(conn->le_conn_latency);
845 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
846 p->min_ce_len = cpu_to_le16(0x0000);
847 p->max_ce_len = cpu_to_le16(0x0000);
850 static void hci_req_add_le_create_conn(struct hci_request *req,
851 struct hci_conn *conn,
852 bdaddr_t *direct_rpa)
854 struct hci_dev *hdev = conn->hdev;
857 /* If direct address was provided we use it instead of current
861 if (bacmp(&req->hdev->random_addr, direct_rpa))
862 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
865 /* direct address is always RPA */
866 own_addr_type = ADDR_LE_DEV_RANDOM;
868 /* Update random address, but set require_privacy to false so
869 * that we never connect with an non-resolvable address.
871 if (hci_update_random_address(req, false, conn_use_rpa(conn),
876 if (use_ext_conn(hdev)) {
877 struct hci_cp_le_ext_create_conn *cp;
878 struct hci_cp_le_ext_conn_param *p;
879 u8 data[sizeof(*cp) + sizeof(*p) * 3];
883 p = (void *) cp->data;
885 memset(cp, 0, sizeof(*cp));
887 bacpy(&cp->peer_addr, &conn->dst);
888 cp->peer_addr_type = conn->dst_type;
889 cp->own_addr_type = own_addr_type;
894 cp->phys |= LE_SCAN_PHY_1M;
895 set_ext_conn_params(conn, p);
902 cp->phys |= LE_SCAN_PHY_2M;
903 set_ext_conn_params(conn, p);
909 if (scan_coded(hdev)) {
910 cp->phys |= LE_SCAN_PHY_CODED;
911 set_ext_conn_params(conn, p);
916 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
919 struct hci_cp_le_create_conn cp;
921 memset(&cp, 0, sizeof(cp));
923 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
924 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
926 bacpy(&cp.peer_addr, &conn->dst);
927 cp.peer_addr_type = conn->dst_type;
928 cp.own_address_type = own_addr_type;
929 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
930 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
931 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
932 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
933 cp.min_ce_len = cpu_to_le16(0x0000);
934 cp.max_ce_len = cpu_to_le16(0x0000);
936 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
939 conn->state = BT_CONNECT;
940 clear_bit(HCI_CONN_SCANNING, &conn->flags);
943 static void hci_req_directed_advertising(struct hci_request *req,
944 struct hci_conn *conn)
946 struct hci_dev *hdev = req->hdev;
950 if (ext_adv_capable(hdev)) {
951 struct hci_cp_le_set_ext_adv_params cp;
952 bdaddr_t random_addr;
954 /* Set require_privacy to false so that the remote device has a
955 * chance of identifying us.
957 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
958 &own_addr_type, &random_addr) < 0)
961 memset(&cp, 0, sizeof(cp));
963 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
964 cp.own_addr_type = own_addr_type;
965 cp.channel_map = hdev->le_adv_channel_map;
966 cp.tx_power = HCI_TX_POWER_INVALID;
967 cp.primary_phy = HCI_ADV_PHY_1M;
968 cp.secondary_phy = HCI_ADV_PHY_1M;
969 cp.handle = 0; /* Use instance 0 for directed adv */
970 cp.own_addr_type = own_addr_type;
971 cp.peer_addr_type = conn->dst_type;
972 bacpy(&cp.peer_addr, &conn->dst);
974 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
975 * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
976 * does not supports advertising data when the advertising set already
977 * contains some, the controller shall return erroc code 'Invalid
978 * HCI Command Parameters(0x12).
979 * So it is required to remove adv set for handle 0x00. since we use
980 * instance 0 for directed adv.
982 __hci_req_remove_ext_adv_instance(req, cp.handle);
984 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
986 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
987 bacmp(&random_addr, BDADDR_ANY) &&
988 bacmp(&random_addr, &hdev->random_addr)) {
989 struct hci_cp_le_set_adv_set_rand_addr cp;
991 memset(&cp, 0, sizeof(cp));
994 bacpy(&cp.bdaddr, &random_addr);
997 HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
1001 __hci_req_enable_ext_advertising(req, 0x00);
1003 struct hci_cp_le_set_adv_param cp;
1005 /* Clear the HCI_LE_ADV bit temporarily so that the
1006 * hci_update_random_address knows that it's safe to go ahead
1007 * and write a new random address. The flag will be set back on
1008 * as soon as the SET_ADV_ENABLE HCI command completes.
1010 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1012 /* Set require_privacy to false so that the remote device has a
1013 * chance of identifying us.
1015 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1016 &own_addr_type) < 0)
1019 memset(&cp, 0, sizeof(cp));
1021 /* Some controllers might reject command if intervals are not
1022 * within range for undirected advertising.
1023 * BCM20702A0 is known to be affected by this.
1025 cp.min_interval = cpu_to_le16(0x0020);
1026 cp.max_interval = cpu_to_le16(0x0020);
1028 cp.type = LE_ADV_DIRECT_IND;
1029 cp.own_address_type = own_addr_type;
1030 cp.direct_addr_type = conn->dst_type;
1031 bacpy(&cp.direct_addr, &conn->dst);
1032 cp.channel_map = hdev->le_adv_channel_map;
1034 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1037 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1041 conn->state = BT_CONNECT;
1044 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1045 u8 dst_type, u8 sec_level, u16 conn_timeout,
1046 u8 role, bdaddr_t *direct_rpa)
1048 struct hci_conn_params *params;
1049 struct hci_conn *conn;
1050 struct smp_irk *irk;
1051 struct hci_request req;
1054 /* This ensures that during disable le_scan address resolution
1055 * will not be disabled if it is followed by le_create_conn
1057 bool rpa_le_conn = true;
1059 /* Let's make sure that le is enabled.*/
1060 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1061 if (lmp_le_capable(hdev))
1062 return ERR_PTR(-ECONNREFUSED);
1064 return ERR_PTR(-EOPNOTSUPP);
1067 /* Since the controller supports only one LE connection attempt at a
1068 * time, we return -EBUSY if there is any connection attempt running.
1070 if (hci_lookup_le_connect(hdev))
1071 return ERR_PTR(-EBUSY);
1073 /* If there's already a connection object but it's not in
1074 * scanning state it means it must already be established, in
1075 * which case we can't do anything else except report a failure
1078 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1079 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1080 return ERR_PTR(-EBUSY);
1083 /* When given an identity address with existing identity
1084 * resolving key, the connection needs to be established
1085 * to a resolvable random address.
1087 * Storing the resolvable random address is required here
1088 * to handle connection failures. The address will later
1089 * be resolved back into the original identity address
1090 * from the connect request.
1092 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1093 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1095 dst_type = ADDR_LE_DEV_RANDOM;
1099 bacpy(&conn->dst, dst);
1101 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1103 return ERR_PTR(-ENOMEM);
1104 hci_conn_hold(conn);
1105 conn->pending_sec_level = sec_level;
1108 conn->dst_type = dst_type;
1109 conn->sec_level = BT_SECURITY_LOW;
1110 conn->conn_timeout = conn_timeout;
1112 hci_req_init(&req, hdev);
1114 /* Disable advertising if we're active. For central role
1115 * connections most controllers will refuse to connect if
1116 * advertising is enabled, and for peripheral role connections we
1117 * anyway have to disable it in order to start directed
1118 * advertising. Any registered advertisements will be
1119 * re-enabled after the connection attempt is finished.
1121 if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1122 __hci_req_pause_adv_instances(&req);
1124 /* If requested to connect as peripheral use directed advertising */
1125 if (conn->role == HCI_ROLE_SLAVE) {
1126 /* If we're active scanning most controllers are unable
1127 * to initiate advertising. Simply reject the attempt.
1129 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1130 hdev->le_scan_type == LE_SCAN_ACTIVE) {
1131 hci_req_purge(&req);
1133 return ERR_PTR(-EBUSY);
1136 hci_req_directed_advertising(&req, conn);
1140 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1142 conn->le_conn_min_interval = params->conn_min_interval;
1143 conn->le_conn_max_interval = params->conn_max_interval;
1144 conn->le_conn_latency = params->conn_latency;
1145 conn->le_supv_timeout = params->supervision_timeout;
1147 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1148 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1149 conn->le_conn_latency = hdev->le_conn_latency;
1150 conn->le_supv_timeout = hdev->le_supv_timeout;
1153 /* If controller is scanning, we stop it since some controllers are
1154 * not able to scan and connect at the same time. Also set the
1155 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1156 * handler for scan disabling knows to set the correct discovery
1159 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1160 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1161 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1164 hci_req_add_le_create_conn(&req, conn, direct_rpa);
1167 err = hci_req_run(&req, create_le_conn_complete);
1171 if (hdev->adv_instance_cnt)
1172 hci_req_resume_adv_instances(hdev);
1174 return ERR_PTR(err);
1180 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1182 struct hci_conn *conn;
1184 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1188 if (conn->state != BT_CONNECTED)
1194 /* This function requires the caller holds hdev->lock */
1195 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1196 bdaddr_t *addr, u8 addr_type)
1198 struct hci_conn_params *params;
1200 if (is_connected(hdev, addr, addr_type))
1203 params = hci_conn_params_lookup(hdev, addr, addr_type);
1205 params = hci_conn_params_add(hdev, addr, addr_type);
1209 /* If we created new params, mark them to be deleted in
1210 * hci_connect_le_scan_cleanup. It's different case than
1211 * existing disabled params, those will stay after cleanup.
1213 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1216 /* We're trying to connect, so make sure params are at pend_le_conns */
1217 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1218 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1219 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1220 list_del_init(¶ms->action);
1221 list_add(¶ms->action, &hdev->pend_le_conns);
1224 params->explicit_connect = true;
1226 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1227 params->auto_connect);
1232 /* This function requires the caller holds hdev->lock */
1233 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1234 u8 dst_type, u8 sec_level,
1236 enum conn_reasons conn_reason)
1238 struct hci_conn *conn;
1240 /* Let's make sure that le is enabled.*/
1241 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1242 if (lmp_le_capable(hdev))
1243 return ERR_PTR(-ECONNREFUSED);
1245 return ERR_PTR(-EOPNOTSUPP);
1248 /* Some devices send ATT messages as soon as the physical link is
1249 * established. To be able to handle these ATT messages, the user-
1250 * space first establishes the connection and then starts the pairing
1253 * So if a hci_conn object already exists for the following connection
1254 * attempt, we simply update pending_sec_level and auth_type fields
1255 * and return the object found.
1257 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1259 if (conn->pending_sec_level < sec_level)
1260 conn->pending_sec_level = sec_level;
1264 BT_DBG("requesting refresh of dst_addr");
1266 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1268 return ERR_PTR(-ENOMEM);
1270 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1272 return ERR_PTR(-EBUSY);
1275 conn->state = BT_CONNECT;
1276 set_bit(HCI_CONN_SCANNING, &conn->flags);
1277 conn->dst_type = dst_type;
1278 conn->sec_level = BT_SECURITY_LOW;
1279 conn->pending_sec_level = sec_level;
1280 conn->conn_timeout = conn_timeout;
1281 conn->conn_reason = conn_reason;
1283 hci_update_background_scan(hdev);
1286 hci_conn_hold(conn);
1290 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1291 u8 sec_level, u8 auth_type,
1292 enum conn_reasons conn_reason)
1294 struct hci_conn *acl;
1296 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1297 if (lmp_bredr_capable(hdev))
1298 return ERR_PTR(-ECONNREFUSED);
1300 return ERR_PTR(-EOPNOTSUPP);
1303 /* Reject outgoing connection to device with same BD ADDR against
1306 if (!bacmp(&hdev->bdaddr, dst)) {
1307 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1309 return ERR_PTR(-ECONNREFUSED);
1312 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1314 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1316 return ERR_PTR(-ENOMEM);
1321 acl->conn_reason = conn_reason;
1322 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1323 acl->sec_level = BT_SECURITY_LOW;
1324 acl->pending_sec_level = sec_level;
1325 acl->auth_type = auth_type;
1326 hci_acl_create_connection(acl);
1332 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1335 struct hci_conn *acl;
1336 struct hci_conn *sco;
1338 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1339 CONN_REASON_SCO_CONNECT);
1343 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1345 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1348 return ERR_PTR(-ENOMEM);
1357 sco->setting = setting;
1359 if (acl->state == BT_CONNECTED &&
1360 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1361 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1362 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1364 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1365 /* defer SCO setup until mode change completed */
1366 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1370 hci_sco_setup(acl, 0x00);
1376 /* Check link security requirement */
1377 int hci_conn_check_link_mode(struct hci_conn *conn)
1379 BT_DBG("hcon %p", conn);
1381 /* In Secure Connections Only mode, it is required that Secure
1382 * Connections is used and the link is encrypted with AES-CCM
1383 * using a P-256 authenticated combination key.
1385 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1386 if (!hci_conn_sc_enabled(conn) ||
1387 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1388 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1392 /* AES encryption is required for Level 4:
1394 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1397 * 128-bit equivalent strength for link and encryption keys
1398 * required using FIPS approved algorithms (E0 not allowed,
1399 * SAFER+ not allowed, and P-192 not allowed; encryption key
1402 if (conn->sec_level == BT_SECURITY_FIPS &&
1403 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1404 bt_dev_err(conn->hdev,
1405 "Invalid security: Missing AES-CCM usage");
1409 if (hci_conn_ssp_enabled(conn) &&
1410 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1416 /* Authenticate remote device */
1417 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1419 BT_DBG("hcon %p", conn);
1421 if (conn->pending_sec_level > sec_level)
1422 sec_level = conn->pending_sec_level;
1424 if (sec_level > conn->sec_level)
1425 conn->pending_sec_level = sec_level;
1426 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1429 /* Make sure we preserve an existing MITM requirement*/
1430 auth_type |= (conn->auth_type & 0x01);
1432 conn->auth_type = auth_type;
1434 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1435 struct hci_cp_auth_requested cp;
1437 cp.handle = cpu_to_le16(conn->handle);
1438 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1441 /* If we're already encrypted set the REAUTH_PEND flag,
1442 * otherwise set the ENCRYPT_PEND.
1444 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1445 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1447 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1453 /* Encrypt the link */
1454 static void hci_conn_encrypt(struct hci_conn *conn)
1456 BT_DBG("hcon %p", conn);
1458 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1459 struct hci_cp_set_conn_encrypt cp;
1460 cp.handle = cpu_to_le16(conn->handle);
1462 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1467 /* Enable security */
1468 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1471 BT_DBG("hcon %p", conn);
1473 if (conn->type == LE_LINK)
1474 return smp_conn_security(conn, sec_level);
1476 /* For sdp we don't need the link key. */
1477 if (sec_level == BT_SECURITY_SDP)
1480 /* For non 2.1 devices and low security level we don't need the link
1482 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1485 /* For other security levels we need the link key. */
1486 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1489 switch (conn->key_type) {
1490 case HCI_LK_AUTH_COMBINATION_P256:
1491 /* An authenticated FIPS approved combination key has
1492 * sufficient security for security level 4 or lower.
1494 if (sec_level <= BT_SECURITY_FIPS)
1497 case HCI_LK_AUTH_COMBINATION_P192:
1498 /* An authenticated combination key has sufficient security for
1499 * security level 3 or lower.
1501 if (sec_level <= BT_SECURITY_HIGH)
1504 case HCI_LK_UNAUTH_COMBINATION_P192:
1505 case HCI_LK_UNAUTH_COMBINATION_P256:
1506 /* An unauthenticated combination key has sufficient security
1507 * for security level 2 or lower.
1509 if (sec_level <= BT_SECURITY_MEDIUM)
1512 case HCI_LK_COMBINATION:
1513 /* A combination key has always sufficient security for the
1514 * security levels 2 or lower. High security level requires the
1515 * combination key is generated using maximum PIN code length
1516 * (16). For pre 2.1 units.
1518 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
1526 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1530 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1532 if (!hci_conn_auth(conn, sec_level, auth_type))
1536 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1537 /* Ensure that the encryption key size has been read,
1538 * otherwise stall the upper layer responses.
1540 if (!conn->enc_key_size)
1543 /* Nothing else needed, all requirements are met */
1547 hci_conn_encrypt(conn);
1550 EXPORT_SYMBOL(hci_conn_security);
1552 /* Check secure link requirement */
1553 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1555 BT_DBG("hcon %p", conn);
1557 /* Accept if non-secure or higher security level is required */
1558 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1561 /* Accept if secure or higher security level is already present */
1562 if (conn->sec_level == BT_SECURITY_HIGH ||
1563 conn->sec_level == BT_SECURITY_FIPS)
1566 /* Reject not secure link */
1569 EXPORT_SYMBOL(hci_conn_check_secure);
1572 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1574 BT_DBG("hcon %p", conn);
1576 if (role == conn->role)
1579 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1580 struct hci_cp_switch_role cp;
1581 bacpy(&cp.bdaddr, &conn->dst);
1583 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1588 EXPORT_SYMBOL(hci_conn_switch_role);
1590 /* Enter active mode */
1591 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1593 struct hci_dev *hdev = conn->hdev;
1595 BT_DBG("hcon %p mode %d", conn, conn->mode);
1597 if (conn->mode != HCI_CM_SNIFF)
1600 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1603 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1604 struct hci_cp_exit_sniff_mode cp;
1605 cp.handle = cpu_to_le16(conn->handle);
1606 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1610 if (hdev->idle_timeout > 0)
1611 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1612 msecs_to_jiffies(hdev->idle_timeout));
1615 /* Drop all connection on the device */
1616 void hci_conn_hash_flush(struct hci_dev *hdev)
1618 struct hci_conn_hash *h = &hdev->conn_hash;
1619 struct hci_conn *c, *n;
1621 BT_DBG("hdev %s", hdev->name);
1623 list_for_each_entry_safe(c, n, &h->list, list) {
1624 c->state = BT_CLOSED;
1626 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1631 /* Check pending connect attempts */
1632 void hci_conn_check_pending(struct hci_dev *hdev)
1634 struct hci_conn *conn;
1636 BT_DBG("hdev %s", hdev->name);
1640 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1642 hci_acl_create_connection(conn);
1644 hci_dev_unlock(hdev);
1647 static u32 get_link_mode(struct hci_conn *conn)
1651 if (conn->role == HCI_ROLE_MASTER)
1652 link_mode |= HCI_LM_MASTER;
1654 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1655 link_mode |= HCI_LM_ENCRYPT;
1657 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1658 link_mode |= HCI_LM_AUTH;
1660 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1661 link_mode |= HCI_LM_SECURE;
1663 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1664 link_mode |= HCI_LM_FIPS;
1669 int hci_get_conn_list(void __user *arg)
1672 struct hci_conn_list_req req, *cl;
1673 struct hci_conn_info *ci;
1674 struct hci_dev *hdev;
1675 int n = 0, size, err;
1677 if (copy_from_user(&req, arg, sizeof(req)))
1680 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1683 size = sizeof(req) + req.conn_num * sizeof(*ci);
1685 cl = kmalloc(size, GFP_KERNEL);
1689 hdev = hci_dev_get(req.dev_id);
1698 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1699 bacpy(&(ci + n)->bdaddr, &c->dst);
1700 (ci + n)->handle = c->handle;
1701 (ci + n)->type = c->type;
1702 (ci + n)->out = c->out;
1703 (ci + n)->state = c->state;
1704 (ci + n)->link_mode = get_link_mode(c);
1705 if (++n >= req.conn_num)
1708 hci_dev_unlock(hdev);
1710 cl->dev_id = hdev->id;
1712 size = sizeof(req) + n * sizeof(*ci);
1716 err = copy_to_user(arg, cl, size);
1719 return err ? -EFAULT : 0;
1722 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1724 struct hci_conn_info_req req;
1725 struct hci_conn_info ci;
1726 struct hci_conn *conn;
1727 char __user *ptr = arg + sizeof(req);
1729 if (copy_from_user(&req, arg, sizeof(req)))
1733 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1735 bacpy(&ci.bdaddr, &conn->dst);
1736 ci.handle = conn->handle;
1737 ci.type = conn->type;
1739 ci.state = conn->state;
1740 ci.link_mode = get_link_mode(conn);
1742 hci_dev_unlock(hdev);
1747 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1750 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1752 struct hci_auth_info_req req;
1753 struct hci_conn *conn;
1755 if (copy_from_user(&req, arg, sizeof(req)))
1759 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1761 req.type = conn->auth_type;
1762 hci_dev_unlock(hdev);
1767 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1770 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1772 struct hci_dev *hdev = conn->hdev;
1773 struct hci_chan *chan;
1775 BT_DBG("%s hcon %p", hdev->name, conn);
1777 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1778 BT_DBG("Refusing to create new hci_chan");
1782 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1786 chan->conn = hci_conn_get(conn);
1787 skb_queue_head_init(&chan->data_q);
1788 chan->state = BT_CONNECTED;
1790 list_add_rcu(&chan->list, &conn->chan_list);
1795 void hci_chan_del(struct hci_chan *chan)
1797 struct hci_conn *conn = chan->conn;
1798 struct hci_dev *hdev = conn->hdev;
1800 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1802 list_del_rcu(&chan->list);
1806 /* Prevent new hci_chan's to be created for this hci_conn */
1807 set_bit(HCI_CONN_DROP, &conn->flags);
1811 skb_queue_purge(&chan->data_q);
1815 void hci_chan_list_flush(struct hci_conn *conn)
1817 struct hci_chan *chan, *n;
1819 BT_DBG("hcon %p", conn);
1821 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1825 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1828 struct hci_chan *hchan;
1830 list_for_each_entry(hchan, &hcon->chan_list, list) {
1831 if (hchan->handle == handle)
1838 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1840 struct hci_conn_hash *h = &hdev->conn_hash;
1841 struct hci_conn *hcon;
1842 struct hci_chan *hchan = NULL;
1846 list_for_each_entry_rcu(hcon, &h->list, list) {
1847 hchan = __hci_chan_lookup_handle(hcon, handle);
1857 u32 hci_conn_get_phy(struct hci_conn *conn)
1861 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1862 * Table 6.2: Packets defined for synchronous, asynchronous, and
1863 * CPB logical transport types.
1865 switch (conn->type) {
1867 /* SCO logical transport (1 Mb/s):
1868 * HV1, HV2, HV3 and DV.
1870 phys |= BT_PHY_BR_1M_1SLOT;
1875 /* ACL logical transport (1 Mb/s) ptt=0:
1876 * DH1, DM3, DH3, DM5 and DH5.
1878 phys |= BT_PHY_BR_1M_1SLOT;
1880 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1881 phys |= BT_PHY_BR_1M_3SLOT;
1883 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1884 phys |= BT_PHY_BR_1M_5SLOT;
1886 /* ACL logical transport (2 Mb/s) ptt=1:
1887 * 2-DH1, 2-DH3 and 2-DH5.
1889 if (!(conn->pkt_type & HCI_2DH1))
1890 phys |= BT_PHY_EDR_2M_1SLOT;
1892 if (!(conn->pkt_type & HCI_2DH3))
1893 phys |= BT_PHY_EDR_2M_3SLOT;
1895 if (!(conn->pkt_type & HCI_2DH5))
1896 phys |= BT_PHY_EDR_2M_5SLOT;
1898 /* ACL logical transport (3 Mb/s) ptt=1:
1899 * 3-DH1, 3-DH3 and 3-DH5.
1901 if (!(conn->pkt_type & HCI_3DH1))
1902 phys |= BT_PHY_EDR_3M_1SLOT;
1904 if (!(conn->pkt_type & HCI_3DH3))
1905 phys |= BT_PHY_EDR_3M_3SLOT;
1907 if (!(conn->pkt_type & HCI_3DH5))
1908 phys |= BT_PHY_EDR_3M_5SLOT;
1913 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1914 phys |= BT_PHY_BR_1M_1SLOT;
1916 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1917 phys |= BT_PHY_BR_1M_3SLOT;
1919 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1920 if (!(conn->pkt_type & ESCO_2EV3))
1921 phys |= BT_PHY_EDR_2M_1SLOT;
1923 if (!(conn->pkt_type & ESCO_2EV5))
1924 phys |= BT_PHY_EDR_2M_3SLOT;
1926 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1927 if (!(conn->pkt_type & ESCO_3EV3))
1928 phys |= BT_PHY_EDR_3M_1SLOT;
1930 if (!(conn->pkt_type & ESCO_3EV5))
1931 phys |= BT_PHY_EDR_3M_3SLOT;
1936 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1937 phys |= BT_PHY_LE_1M_TX;
1939 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1940 phys |= BT_PHY_LE_1M_RX;
1942 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1943 phys |= BT_PHY_LE_2M_TX;
1945 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1946 phys |= BT_PHY_LE_2M_RX;
1948 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
1949 phys |= BT_PHY_LE_CODED_TX;
1951 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
1952 phys |= BT_PHY_LE_CODED_RX;