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;
598 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
599 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
601 /* Set Default Authenticated payload timeout to 30s */
602 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
604 if (conn->role == HCI_ROLE_MASTER)
609 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
612 /* conn->src should reflect the local identity address */
613 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
616 if (lmp_esco_capable(hdev))
617 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
618 (hdev->esco_type & EDR_ESCO_MASK);
620 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
623 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
627 skb_queue_head_init(&conn->data_q);
629 INIT_LIST_HEAD(&conn->chan_list);
631 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
632 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
633 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
634 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
635 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
637 atomic_set(&conn->refcnt, 0);
641 hci_conn_hash_add(hdev, conn);
643 /* The SCO and eSCO connections will only be notified when their
644 * setup has been completed. This is different to ACL links which
645 * can be notified right away.
647 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
649 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
652 hci_conn_init_sysfs(conn);
657 int hci_conn_del(struct hci_conn *conn)
659 struct hci_dev *hdev = conn->hdev;
661 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
663 cancel_delayed_work_sync(&conn->disc_work);
664 cancel_delayed_work_sync(&conn->auto_accept_work);
665 cancel_delayed_work_sync(&conn->idle_work);
667 if (conn->type == ACL_LINK) {
668 struct hci_conn *sco = conn->link;
673 hdev->acl_cnt += conn->sent;
674 } else if (conn->type == LE_LINK) {
675 cancel_delayed_work(&conn->le_conn_timeout);
678 hdev->le_cnt += conn->sent;
680 hdev->acl_cnt += conn->sent;
682 struct hci_conn *acl = conn->link;
690 amp_mgr_put(conn->amp_mgr);
692 skb_queue_purge(&conn->data_q);
694 /* Remove the connection from the list and cleanup its remaining
695 * state. This is a separate function since for some cases like
696 * BT_CONNECT_SCAN we *only* want the cleanup part without the
697 * rest of hci_conn_del.
699 hci_conn_cleanup(conn);
704 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
706 int use_src = bacmp(src, BDADDR_ANY);
707 struct hci_dev *hdev = NULL, *d;
709 BT_DBG("%pMR -> %pMR", src, dst);
711 read_lock(&hci_dev_list_lock);
713 list_for_each_entry(d, &hci_dev_list, list) {
714 if (!test_bit(HCI_UP, &d->flags) ||
715 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
716 d->dev_type != HCI_PRIMARY)
720 * No source address - find interface with bdaddr != dst
721 * Source address - find interface with bdaddr == src
728 if (src_type == BDADDR_BREDR) {
729 if (!lmp_bredr_capable(d))
731 bacpy(&id_addr, &d->bdaddr);
732 id_addr_type = BDADDR_BREDR;
734 if (!lmp_le_capable(d))
737 hci_copy_identity_address(d, &id_addr,
740 /* Convert from HCI to three-value type */
741 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
742 id_addr_type = BDADDR_LE_PUBLIC;
744 id_addr_type = BDADDR_LE_RANDOM;
747 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
751 if (bacmp(&d->bdaddr, dst)) {
758 hdev = hci_dev_hold(hdev);
760 read_unlock(&hci_dev_list_lock);
763 EXPORT_SYMBOL(hci_get_route);
765 /* This function requires the caller holds hdev->lock */
766 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
768 struct hci_dev *hdev = conn->hdev;
769 struct hci_conn_params *params;
771 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
773 if (params && params->conn) {
774 hci_conn_drop(params->conn);
775 hci_conn_put(params->conn);
779 conn->state = BT_CLOSED;
781 /* If the status indicates successful cancellation of
782 * the attempt (i.e. Unknown Connection Id) there's no point of
783 * notifying failure since we'll go back to keep trying to
784 * connect. The only exception is explicit connect requests
785 * where a timeout + cancel does indicate an actual failure.
787 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
788 (params && params->explicit_connect))
789 mgmt_connect_failed(hdev, &conn->dst, conn->type,
790 conn->dst_type, status);
792 hci_connect_cfm(conn, status);
796 /* The suspend notifier is waiting for all devices to disconnect and an
797 * LE connect cancel will result in an hci_le_conn_failed. Once the last
798 * connection is deleted, we should also wake the suspend queue to
799 * complete suspend operations.
801 if (list_empty(&hdev->conn_hash.list) &&
802 test_and_clear_bit(SUSPEND_DISCONNECTING, hdev->suspend_tasks)) {
803 wake_up(&hdev->suspend_wait_q);
806 /* Since we may have temporarily stopped the background scanning in
807 * favor of connection establishment, we should restart it.
809 hci_update_background_scan(hdev);
811 /* Re-enable advertising in case this was a failed connection
812 * attempt as a peripheral.
814 hci_req_reenable_advertising(hdev);
817 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
819 struct hci_conn *conn;
823 conn = hci_lookup_le_connect(hdev);
825 if (hdev->adv_instance_cnt)
826 hci_req_resume_adv_instances(hdev);
829 hci_connect_le_scan_cleanup(conn);
833 bt_dev_err(hdev, "request failed to create LE connection: "
834 "status 0x%2.2x", status);
839 hci_le_conn_failed(conn, status);
842 hci_dev_unlock(hdev);
845 static bool conn_use_rpa(struct hci_conn *conn)
847 struct hci_dev *hdev = conn->hdev;
849 return hci_dev_test_flag(hdev, HCI_PRIVACY);
852 static void set_ext_conn_params(struct hci_conn *conn,
853 struct hci_cp_le_ext_conn_param *p)
855 struct hci_dev *hdev = conn->hdev;
857 memset(p, 0, sizeof(*p));
859 p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
860 p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
861 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
862 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
863 p->conn_latency = cpu_to_le16(conn->le_conn_latency);
864 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
865 p->min_ce_len = cpu_to_le16(0x0000);
866 p->max_ce_len = cpu_to_le16(0x0000);
869 static void hci_req_add_le_create_conn(struct hci_request *req,
870 struct hci_conn *conn,
871 bdaddr_t *direct_rpa)
873 struct hci_dev *hdev = conn->hdev;
876 /* If direct address was provided we use it instead of current
880 if (bacmp(&req->hdev->random_addr, direct_rpa))
881 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
884 /* direct address is always RPA */
885 own_addr_type = ADDR_LE_DEV_RANDOM;
887 /* Update random address, but set require_privacy to false so
888 * that we never connect with an non-resolvable address.
890 if (hci_update_random_address(req, false, conn_use_rpa(conn),
895 if (use_ext_conn(hdev)) {
896 struct hci_cp_le_ext_create_conn *cp;
897 struct hci_cp_le_ext_conn_param *p;
898 u8 data[sizeof(*cp) + sizeof(*p) * 3];
902 p = (void *) cp->data;
904 memset(cp, 0, sizeof(*cp));
906 bacpy(&cp->peer_addr, &conn->dst);
907 cp->peer_addr_type = conn->dst_type;
908 cp->own_addr_type = own_addr_type;
913 cp->phys |= LE_SCAN_PHY_1M;
914 set_ext_conn_params(conn, p);
921 cp->phys |= LE_SCAN_PHY_2M;
922 set_ext_conn_params(conn, p);
928 if (scan_coded(hdev)) {
929 cp->phys |= LE_SCAN_PHY_CODED;
930 set_ext_conn_params(conn, p);
935 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
938 struct hci_cp_le_create_conn cp;
940 memset(&cp, 0, sizeof(cp));
942 cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
943 cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);
945 bacpy(&cp.peer_addr, &conn->dst);
946 cp.peer_addr_type = conn->dst_type;
947 cp.own_address_type = own_addr_type;
948 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
949 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
950 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
951 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
952 cp.min_ce_len = cpu_to_le16(0x0000);
953 cp.max_ce_len = cpu_to_le16(0x0000);
955 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
958 conn->state = BT_CONNECT;
959 clear_bit(HCI_CONN_SCANNING, &conn->flags);
962 static void hci_req_directed_advertising(struct hci_request *req,
963 struct hci_conn *conn)
965 struct hci_dev *hdev = req->hdev;
969 if (ext_adv_capable(hdev)) {
970 struct hci_cp_le_set_ext_adv_params cp;
971 bdaddr_t random_addr;
973 /* Set require_privacy to false so that the remote device has a
974 * chance of identifying us.
976 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
977 &own_addr_type, &random_addr) < 0)
980 memset(&cp, 0, sizeof(cp));
982 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
983 cp.own_addr_type = own_addr_type;
984 cp.channel_map = hdev->le_adv_channel_map;
985 cp.tx_power = HCI_TX_POWER_INVALID;
986 cp.primary_phy = HCI_ADV_PHY_1M;
987 cp.secondary_phy = HCI_ADV_PHY_1M;
988 cp.handle = 0; /* Use instance 0 for directed adv */
989 cp.own_addr_type = own_addr_type;
990 cp.peer_addr_type = conn->dst_type;
991 bacpy(&cp.peer_addr, &conn->dst);
993 /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
994 * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
995 * does not supports advertising data when the advertising set already
996 * contains some, the controller shall return erroc code 'Invalid
997 * HCI Command Parameters(0x12).
998 * So it is required to remove adv set for handle 0x00. since we use
999 * instance 0 for directed adv.
1001 __hci_req_remove_ext_adv_instance(req, cp.handle);
1003 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
1005 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
1006 bacmp(&random_addr, BDADDR_ANY) &&
1007 bacmp(&random_addr, &hdev->random_addr)) {
1008 struct hci_cp_le_set_adv_set_rand_addr cp;
1010 memset(&cp, 0, sizeof(cp));
1013 bacpy(&cp.bdaddr, &random_addr);
1016 HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
1020 __hci_req_enable_ext_advertising(req, 0x00);
1022 struct hci_cp_le_set_adv_param cp;
1024 /* Clear the HCI_LE_ADV bit temporarily so that the
1025 * hci_update_random_address knows that it's safe to go ahead
1026 * and write a new random address. The flag will be set back on
1027 * as soon as the SET_ADV_ENABLE HCI command completes.
1029 hci_dev_clear_flag(hdev, HCI_LE_ADV);
1031 /* Set require_privacy to false so that the remote device has a
1032 * chance of identifying us.
1034 if (hci_update_random_address(req, false, conn_use_rpa(conn),
1035 &own_addr_type) < 0)
1038 memset(&cp, 0, sizeof(cp));
1040 /* Some controllers might reject command if intervals are not
1041 * within range for undirected advertising.
1042 * BCM20702A0 is known to be affected by this.
1044 cp.min_interval = cpu_to_le16(0x0020);
1045 cp.max_interval = cpu_to_le16(0x0020);
1047 cp.type = LE_ADV_DIRECT_IND;
1048 cp.own_address_type = own_addr_type;
1049 cp.direct_addr_type = conn->dst_type;
1050 bacpy(&cp.direct_addr, &conn->dst);
1051 cp.channel_map = hdev->le_adv_channel_map;
1053 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
1056 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1060 conn->state = BT_CONNECT;
1063 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1064 u8 dst_type, u8 sec_level, u16 conn_timeout,
1065 u8 role, bdaddr_t *direct_rpa)
1067 struct hci_conn_params *params;
1068 struct hci_conn *conn;
1069 struct smp_irk *irk;
1070 struct hci_request req;
1073 /* This ensures that during disable le_scan address resolution
1074 * will not be disabled if it is followed by le_create_conn
1076 bool rpa_le_conn = true;
1078 /* Let's make sure that le is enabled.*/
1079 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1080 if (lmp_le_capable(hdev))
1081 return ERR_PTR(-ECONNREFUSED);
1083 return ERR_PTR(-EOPNOTSUPP);
1086 /* Since the controller supports only one LE connection attempt at a
1087 * time, we return -EBUSY if there is any connection attempt running.
1089 if (hci_lookup_le_connect(hdev))
1090 return ERR_PTR(-EBUSY);
1092 /* If there's already a connection object but it's not in
1093 * scanning state it means it must already be established, in
1094 * which case we can't do anything else except report a failure
1097 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1098 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1099 return ERR_PTR(-EBUSY);
1102 /* When given an identity address with existing identity
1103 * resolving key, the connection needs to be established
1104 * to a resolvable random address.
1106 * Storing the resolvable random address is required here
1107 * to handle connection failures. The address will later
1108 * be resolved back into the original identity address
1109 * from the connect request.
1111 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1112 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1114 dst_type = ADDR_LE_DEV_RANDOM;
1118 bacpy(&conn->dst, dst);
1120 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1122 return ERR_PTR(-ENOMEM);
1123 hci_conn_hold(conn);
1124 conn->pending_sec_level = sec_level;
1127 conn->dst_type = dst_type;
1128 conn->sec_level = BT_SECURITY_LOW;
1129 conn->conn_timeout = conn_timeout;
1131 hci_req_init(&req, hdev);
1133 /* Disable advertising if we're active. For central role
1134 * connections most controllers will refuse to connect if
1135 * advertising is enabled, and for peripheral role connections we
1136 * anyway have to disable it in order to start directed
1137 * advertising. Any registered advertisements will be
1138 * re-enabled after the connection attempt is finished.
1140 if (hci_dev_test_flag(hdev, HCI_LE_ADV))
1141 __hci_req_pause_adv_instances(&req);
1143 /* If requested to connect as peripheral use directed advertising */
1144 if (conn->role == HCI_ROLE_SLAVE) {
1145 /* If we're active scanning most controllers are unable
1146 * to initiate advertising. Simply reject the attempt.
1148 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1149 hdev->le_scan_type == LE_SCAN_ACTIVE) {
1150 hci_req_purge(&req);
1152 return ERR_PTR(-EBUSY);
1155 hci_req_directed_advertising(&req, conn);
1159 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1161 conn->le_conn_min_interval = params->conn_min_interval;
1162 conn->le_conn_max_interval = params->conn_max_interval;
1163 conn->le_conn_latency = params->conn_latency;
1164 conn->le_supv_timeout = params->supervision_timeout;
1166 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1167 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1168 conn->le_conn_latency = hdev->le_conn_latency;
1169 conn->le_supv_timeout = hdev->le_supv_timeout;
1172 /* If controller is scanning, we stop it since some controllers are
1173 * not able to scan and connect at the same time. Also set the
1174 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1175 * handler for scan disabling knows to set the correct discovery
1178 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1179 hci_req_add_le_scan_disable(&req, rpa_le_conn);
1180 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1183 hci_req_add_le_create_conn(&req, conn, direct_rpa);
1186 err = hci_req_run(&req, create_le_conn_complete);
1190 if (hdev->adv_instance_cnt)
1191 hci_req_resume_adv_instances(hdev);
1193 return ERR_PTR(err);
1199 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1201 struct hci_conn *conn;
1203 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1207 if (conn->state != BT_CONNECTED)
1213 /* This function requires the caller holds hdev->lock */
1214 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1215 bdaddr_t *addr, u8 addr_type)
1217 struct hci_conn_params *params;
1219 if (is_connected(hdev, addr, addr_type))
1222 params = hci_conn_params_lookup(hdev, addr, addr_type);
1224 params = hci_conn_params_add(hdev, addr, addr_type);
1228 /* If we created new params, mark them to be deleted in
1229 * hci_connect_le_scan_cleanup. It's different case than
1230 * existing disabled params, those will stay after cleanup.
1232 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1235 /* We're trying to connect, so make sure params are at pend_le_conns */
1236 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1237 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1238 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1239 list_del_init(¶ms->action);
1240 list_add(¶ms->action, &hdev->pend_le_conns);
1243 params->explicit_connect = true;
1245 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1246 params->auto_connect);
1251 /* This function requires the caller holds hdev->lock */
1252 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1253 u8 dst_type, u8 sec_level,
1255 enum conn_reasons conn_reason)
1257 struct hci_conn *conn;
1259 /* Let's make sure that le is enabled.*/
1260 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1261 if (lmp_le_capable(hdev))
1262 return ERR_PTR(-ECONNREFUSED);
1264 return ERR_PTR(-EOPNOTSUPP);
1267 /* Some devices send ATT messages as soon as the physical link is
1268 * established. To be able to handle these ATT messages, the user-
1269 * space first establishes the connection and then starts the pairing
1272 * So if a hci_conn object already exists for the following connection
1273 * attempt, we simply update pending_sec_level and auth_type fields
1274 * and return the object found.
1276 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1278 if (conn->pending_sec_level < sec_level)
1279 conn->pending_sec_level = sec_level;
1283 BT_DBG("requesting refresh of dst_addr");
1285 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1287 return ERR_PTR(-ENOMEM);
1289 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1291 return ERR_PTR(-EBUSY);
1294 conn->state = BT_CONNECT;
1295 set_bit(HCI_CONN_SCANNING, &conn->flags);
1296 conn->dst_type = dst_type;
1297 conn->sec_level = BT_SECURITY_LOW;
1298 conn->pending_sec_level = sec_level;
1299 conn->conn_timeout = conn_timeout;
1300 conn->conn_reason = conn_reason;
1302 hci_update_background_scan(hdev);
1305 hci_conn_hold(conn);
1309 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1310 u8 sec_level, u8 auth_type,
1311 enum conn_reasons conn_reason)
1313 struct hci_conn *acl;
1315 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1316 if (lmp_bredr_capable(hdev))
1317 return ERR_PTR(-ECONNREFUSED);
1319 return ERR_PTR(-EOPNOTSUPP);
1322 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1324 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1326 return ERR_PTR(-ENOMEM);
1331 acl->conn_reason = conn_reason;
1332 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1333 acl->sec_level = BT_SECURITY_LOW;
1334 acl->pending_sec_level = sec_level;
1335 acl->auth_type = auth_type;
1336 hci_acl_create_connection(acl);
1342 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1345 struct hci_conn *acl;
1346 struct hci_conn *sco;
1348 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1349 CONN_REASON_SCO_CONNECT);
1353 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1355 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1358 return ERR_PTR(-ENOMEM);
1367 sco->setting = setting;
1369 if (acl->state == BT_CONNECTED &&
1370 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1371 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1372 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1374 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1375 /* defer SCO setup until mode change completed */
1376 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1380 hci_sco_setup(acl, 0x00);
1386 /* Check link security requirement */
1387 int hci_conn_check_link_mode(struct hci_conn *conn)
1389 BT_DBG("hcon %p", conn);
1391 /* In Secure Connections Only mode, it is required that Secure
1392 * Connections is used and the link is encrypted with AES-CCM
1393 * using a P-256 authenticated combination key.
1395 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1396 if (!hci_conn_sc_enabled(conn) ||
1397 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1398 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1402 /* AES encryption is required for Level 4:
1404 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1407 * 128-bit equivalent strength for link and encryption keys
1408 * required using FIPS approved algorithms (E0 not allowed,
1409 * SAFER+ not allowed, and P-192 not allowed; encryption key
1412 if (conn->sec_level == BT_SECURITY_FIPS &&
1413 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1414 bt_dev_err(conn->hdev,
1415 "Invalid security: Missing AES-CCM usage");
1419 if (hci_conn_ssp_enabled(conn) &&
1420 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1426 /* Authenticate remote device */
1427 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1429 BT_DBG("hcon %p", conn);
1431 if (conn->pending_sec_level > sec_level)
1432 sec_level = conn->pending_sec_level;
1434 if (sec_level > conn->sec_level)
1435 conn->pending_sec_level = sec_level;
1436 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1439 /* Make sure we preserve an existing MITM requirement*/
1440 auth_type |= (conn->auth_type & 0x01);
1442 conn->auth_type = auth_type;
1444 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1445 struct hci_cp_auth_requested cp;
1447 cp.handle = cpu_to_le16(conn->handle);
1448 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1451 /* If we're already encrypted set the REAUTH_PEND flag,
1452 * otherwise set the ENCRYPT_PEND.
1454 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1455 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1457 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1463 /* Encrypt the link */
1464 static void hci_conn_encrypt(struct hci_conn *conn)
1466 BT_DBG("hcon %p", conn);
1468 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1469 struct hci_cp_set_conn_encrypt cp;
1470 cp.handle = cpu_to_le16(conn->handle);
1472 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1477 /* Enable security */
1478 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1481 BT_DBG("hcon %p", conn);
1483 if (conn->type == LE_LINK)
1484 return smp_conn_security(conn, sec_level);
1486 /* For sdp we don't need the link key. */
1487 if (sec_level == BT_SECURITY_SDP)
1490 /* For non 2.1 devices and low security level we don't need the link
1492 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1495 /* For other security levels we need the link key. */
1496 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1499 /* An authenticated FIPS approved combination key has sufficient
1500 * security for security level 4. */
1501 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1502 sec_level == BT_SECURITY_FIPS)
1505 /* An authenticated combination key has sufficient security for
1506 security level 3. */
1507 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1508 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1509 sec_level == BT_SECURITY_HIGH)
1512 /* An unauthenticated combination key has sufficient security for
1513 security level 1 and 2. */
1514 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1515 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1516 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1519 /* A combination key has always sufficient security for the security
1520 levels 1 or 2. High security level requires the combination key
1521 is generated using maximum PIN code length (16).
1522 For pre 2.1 units. */
1523 if (conn->key_type == HCI_LK_COMBINATION &&
1524 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1525 conn->pin_length == 16))
1529 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1533 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1535 if (!hci_conn_auth(conn, sec_level, auth_type))
1539 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1540 /* Ensure that the encryption key size has been read,
1541 * otherwise stall the upper layer responses.
1543 if (!conn->enc_key_size)
1546 /* Nothing else needed, all requirements are met */
1550 hci_conn_encrypt(conn);
1553 EXPORT_SYMBOL(hci_conn_security);
1555 /* Check secure link requirement */
1556 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1558 BT_DBG("hcon %p", conn);
1560 /* Accept if non-secure or higher security level is required */
1561 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1564 /* Accept if secure or higher security level is already present */
1565 if (conn->sec_level == BT_SECURITY_HIGH ||
1566 conn->sec_level == BT_SECURITY_FIPS)
1569 /* Reject not secure link */
1572 EXPORT_SYMBOL(hci_conn_check_secure);
1575 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1577 BT_DBG("hcon %p", conn);
1579 if (role == conn->role)
1582 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1583 struct hci_cp_switch_role cp;
1584 bacpy(&cp.bdaddr, &conn->dst);
1586 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1591 EXPORT_SYMBOL(hci_conn_switch_role);
1593 /* Enter active mode */
1594 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1596 struct hci_dev *hdev = conn->hdev;
1598 BT_DBG("hcon %p mode %d", conn, conn->mode);
1600 if (conn->mode != HCI_CM_SNIFF)
1603 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1606 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1607 struct hci_cp_exit_sniff_mode cp;
1608 cp.handle = cpu_to_le16(conn->handle);
1609 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1613 if (hdev->idle_timeout > 0)
1614 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1615 msecs_to_jiffies(hdev->idle_timeout));
1618 /* Drop all connection on the device */
1619 void hci_conn_hash_flush(struct hci_dev *hdev)
1621 struct hci_conn_hash *h = &hdev->conn_hash;
1622 struct hci_conn *c, *n;
1624 BT_DBG("hdev %s", hdev->name);
1626 list_for_each_entry_safe(c, n, &h->list, list) {
1627 c->state = BT_CLOSED;
1629 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1634 /* Check pending connect attempts */
1635 void hci_conn_check_pending(struct hci_dev *hdev)
1637 struct hci_conn *conn;
1639 BT_DBG("hdev %s", hdev->name);
1643 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1645 hci_acl_create_connection(conn);
1647 hci_dev_unlock(hdev);
1650 static u32 get_link_mode(struct hci_conn *conn)
1654 if (conn->role == HCI_ROLE_MASTER)
1655 link_mode |= HCI_LM_MASTER;
1657 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1658 link_mode |= HCI_LM_ENCRYPT;
1660 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1661 link_mode |= HCI_LM_AUTH;
1663 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1664 link_mode |= HCI_LM_SECURE;
1666 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1667 link_mode |= HCI_LM_FIPS;
1672 int hci_get_conn_list(void __user *arg)
1675 struct hci_conn_list_req req, *cl;
1676 struct hci_conn_info *ci;
1677 struct hci_dev *hdev;
1678 int n = 0, size, err;
1680 if (copy_from_user(&req, arg, sizeof(req)))
1683 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1686 size = sizeof(req) + req.conn_num * sizeof(*ci);
1688 cl = kmalloc(size, GFP_KERNEL);
1692 hdev = hci_dev_get(req.dev_id);
1701 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1702 bacpy(&(ci + n)->bdaddr, &c->dst);
1703 (ci + n)->handle = c->handle;
1704 (ci + n)->type = c->type;
1705 (ci + n)->out = c->out;
1706 (ci + n)->state = c->state;
1707 (ci + n)->link_mode = get_link_mode(c);
1708 if (++n >= req.conn_num)
1711 hci_dev_unlock(hdev);
1713 cl->dev_id = hdev->id;
1715 size = sizeof(req) + n * sizeof(*ci);
1719 err = copy_to_user(arg, cl, size);
1722 return err ? -EFAULT : 0;
1725 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1727 struct hci_conn_info_req req;
1728 struct hci_conn_info ci;
1729 struct hci_conn *conn;
1730 char __user *ptr = arg + sizeof(req);
1732 if (copy_from_user(&req, arg, sizeof(req)))
1736 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1738 bacpy(&ci.bdaddr, &conn->dst);
1739 ci.handle = conn->handle;
1740 ci.type = conn->type;
1742 ci.state = conn->state;
1743 ci.link_mode = get_link_mode(conn);
1745 hci_dev_unlock(hdev);
1750 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1753 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1755 struct hci_auth_info_req req;
1756 struct hci_conn *conn;
1758 if (copy_from_user(&req, arg, sizeof(req)))
1762 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1764 req.type = conn->auth_type;
1765 hci_dev_unlock(hdev);
1770 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1773 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1775 struct hci_dev *hdev = conn->hdev;
1776 struct hci_chan *chan;
1778 BT_DBG("%s hcon %p", hdev->name, conn);
1780 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1781 BT_DBG("Refusing to create new hci_chan");
1785 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1789 chan->conn = hci_conn_get(conn);
1790 skb_queue_head_init(&chan->data_q);
1791 chan->state = BT_CONNECTED;
1793 list_add_rcu(&chan->list, &conn->chan_list);
1798 void hci_chan_del(struct hci_chan *chan)
1800 struct hci_conn *conn = chan->conn;
1801 struct hci_dev *hdev = conn->hdev;
1803 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1805 list_del_rcu(&chan->list);
1809 /* Prevent new hci_chan's to be created for this hci_conn */
1810 set_bit(HCI_CONN_DROP, &conn->flags);
1814 skb_queue_purge(&chan->data_q);
1818 void hci_chan_list_flush(struct hci_conn *conn)
1820 struct hci_chan *chan, *n;
1822 BT_DBG("hcon %p", conn);
1824 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1828 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1831 struct hci_chan *hchan;
1833 list_for_each_entry(hchan, &hcon->chan_list, list) {
1834 if (hchan->handle == handle)
1841 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1843 struct hci_conn_hash *h = &hdev->conn_hash;
1844 struct hci_conn *hcon;
1845 struct hci_chan *hchan = NULL;
1849 list_for_each_entry_rcu(hcon, &h->list, list) {
1850 hchan = __hci_chan_lookup_handle(hcon, handle);
1860 u32 hci_conn_get_phy(struct hci_conn *conn)
1864 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
1865 * Table 6.2: Packets defined for synchronous, asynchronous, and
1866 * CPB logical transport types.
1868 switch (conn->type) {
1870 /* SCO logical transport (1 Mb/s):
1871 * HV1, HV2, HV3 and DV.
1873 phys |= BT_PHY_BR_1M_1SLOT;
1878 /* ACL logical transport (1 Mb/s) ptt=0:
1879 * DH1, DM3, DH3, DM5 and DH5.
1881 phys |= BT_PHY_BR_1M_1SLOT;
1883 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
1884 phys |= BT_PHY_BR_1M_3SLOT;
1886 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
1887 phys |= BT_PHY_BR_1M_5SLOT;
1889 /* ACL logical transport (2 Mb/s) ptt=1:
1890 * 2-DH1, 2-DH3 and 2-DH5.
1892 if (!(conn->pkt_type & HCI_2DH1))
1893 phys |= BT_PHY_EDR_2M_1SLOT;
1895 if (!(conn->pkt_type & HCI_2DH3))
1896 phys |= BT_PHY_EDR_2M_3SLOT;
1898 if (!(conn->pkt_type & HCI_2DH5))
1899 phys |= BT_PHY_EDR_2M_5SLOT;
1901 /* ACL logical transport (3 Mb/s) ptt=1:
1902 * 3-DH1, 3-DH3 and 3-DH5.
1904 if (!(conn->pkt_type & HCI_3DH1))
1905 phys |= BT_PHY_EDR_3M_1SLOT;
1907 if (!(conn->pkt_type & HCI_3DH3))
1908 phys |= BT_PHY_EDR_3M_3SLOT;
1910 if (!(conn->pkt_type & HCI_3DH5))
1911 phys |= BT_PHY_EDR_3M_5SLOT;
1916 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
1917 phys |= BT_PHY_BR_1M_1SLOT;
1919 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
1920 phys |= BT_PHY_BR_1M_3SLOT;
1922 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
1923 if (!(conn->pkt_type & ESCO_2EV3))
1924 phys |= BT_PHY_EDR_2M_1SLOT;
1926 if (!(conn->pkt_type & ESCO_2EV5))
1927 phys |= BT_PHY_EDR_2M_3SLOT;
1929 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
1930 if (!(conn->pkt_type & ESCO_3EV3))
1931 phys |= BT_PHY_EDR_3M_1SLOT;
1933 if (!(conn->pkt_type & ESCO_3EV5))
1934 phys |= BT_PHY_EDR_3M_3SLOT;
1939 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
1940 phys |= BT_PHY_LE_1M_TX;
1942 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
1943 phys |= BT_PHY_LE_1M_RX;
1945 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
1946 phys |= BT_PHY_LE_2M_TX;
1948 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
1949 phys |= BT_PHY_LE_2M_RX;
1951 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
1952 phys |= BT_PHY_LE_CODED_TX;
1954 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
1955 phys |= BT_PHY_LE_CODED_RX;