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);
126 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
128 hci_conn_del_sysfs(conn);
130 debugfs_remove_recursive(conn->debugfs);
137 static void le_scan_cleanup(struct work_struct *work)
139 struct hci_conn *conn = container_of(work, struct hci_conn,
141 struct hci_dev *hdev = conn->hdev;
142 struct hci_conn *c = NULL;
144 BT_DBG("%s hcon %p", hdev->name, conn);
148 /* Check that the hci_conn is still around */
150 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
157 hci_connect_le_scan_cleanup(conn);
158 hci_conn_cleanup(conn);
161 hci_dev_unlock(hdev);
166 static void hci_connect_le_scan_remove(struct hci_conn *conn)
168 BT_DBG("%s hcon %p", conn->hdev->name, conn);
170 /* We can't call hci_conn_del/hci_conn_cleanup here since that
171 * could deadlock with another hci_conn_del() call that's holding
172 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
173 * Instead, grab temporary extra references to the hci_dev and
174 * hci_conn and perform the necessary cleanup in a separate work
178 hci_dev_hold(conn->hdev);
181 /* Even though we hold a reference to the hdev, many other
182 * things might get cleaned up meanwhile, including the hdev's
183 * own workqueue, so we can't use that for scheduling.
185 schedule_work(&conn->le_scan_cleanup);
188 static void hci_acl_create_connection(struct hci_conn *conn)
190 struct hci_dev *hdev = conn->hdev;
191 struct inquiry_entry *ie;
192 struct hci_cp_create_conn cp;
194 BT_DBG("hcon %p", conn);
196 conn->state = BT_CONNECT;
198 conn->role = HCI_ROLE_MASTER;
202 conn->link_policy = hdev->link_policy;
204 memset(&cp, 0, sizeof(cp));
205 bacpy(&cp.bdaddr, &conn->dst);
206 cp.pscan_rep_mode = 0x02;
208 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
210 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
211 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
212 cp.pscan_mode = ie->data.pscan_mode;
213 cp.clock_offset = ie->data.clock_offset |
217 memcpy(conn->dev_class, ie->data.dev_class, 3);
218 if (ie->data.ssp_mode > 0)
219 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
222 cp.pkt_type = cpu_to_le16(conn->pkt_type);
223 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
224 cp.role_switch = 0x01;
226 cp.role_switch = 0x00;
228 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
231 int hci_disconnect(struct hci_conn *conn, __u8 reason)
233 BT_DBG("hcon %p", conn);
235 /* When we are master of an established connection and it enters
236 * the disconnect timeout, then go ahead and try to read the
237 * current clock offset. Processing of the result is done
238 * within the event handling and hci_clock_offset_evt function.
240 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
241 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
242 struct hci_dev *hdev = conn->hdev;
243 struct hci_cp_read_clock_offset clkoff_cp;
245 clkoff_cp.handle = cpu_to_le16(conn->handle);
246 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
250 return hci_abort_conn(conn, reason);
253 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
255 struct hci_dev *hdev = conn->hdev;
256 struct hci_cp_add_sco cp;
258 BT_DBG("hcon %p", conn);
260 conn->state = BT_CONNECT;
265 cp.handle = cpu_to_le16(handle);
266 cp.pkt_type = cpu_to_le16(conn->pkt_type);
268 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
271 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
273 struct hci_dev *hdev = conn->hdev;
274 struct hci_cp_setup_sync_conn cp;
275 const struct sco_param *param;
277 BT_DBG("hcon %p", conn);
279 conn->state = BT_CONNECT;
284 cp.handle = cpu_to_le16(handle);
286 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
287 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
288 cp.voice_setting = cpu_to_le16(conn->setting);
290 switch (conn->setting & SCO_AIRMODE_MASK) {
291 case SCO_AIRMODE_TRANSP:
292 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
294 param = &esco_param_msbc[conn->attempt - 1];
296 case SCO_AIRMODE_CVSD:
297 if (lmp_esco_capable(conn->link)) {
298 if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
300 param = &esco_param_cvsd[conn->attempt - 1];
302 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
304 param = &sco_param_cvsd[conn->attempt - 1];
311 cp.retrans_effort = param->retrans_effort;
312 cp.pkt_type = __cpu_to_le16(param->pkt_type);
313 cp.max_latency = __cpu_to_le16(param->max_latency);
315 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
321 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
324 struct hci_dev *hdev = conn->hdev;
325 struct hci_conn_params *params;
326 struct hci_cp_le_conn_update cp;
330 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
332 params->conn_min_interval = min;
333 params->conn_max_interval = max;
334 params->conn_latency = latency;
335 params->supervision_timeout = to_multiplier;
338 hci_dev_unlock(hdev);
340 memset(&cp, 0, sizeof(cp));
341 cp.handle = cpu_to_le16(conn->handle);
342 cp.conn_interval_min = cpu_to_le16(min);
343 cp.conn_interval_max = cpu_to_le16(max);
344 cp.conn_latency = cpu_to_le16(latency);
345 cp.supervision_timeout = cpu_to_le16(to_multiplier);
346 cp.min_ce_len = cpu_to_le16(0x0000);
347 cp.max_ce_len = cpu_to_le16(0x0000);
349 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
357 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
358 __u8 ltk[16], __u8 key_size)
360 struct hci_dev *hdev = conn->hdev;
361 struct hci_cp_le_start_enc cp;
363 BT_DBG("hcon %p", conn);
365 memset(&cp, 0, sizeof(cp));
367 cp.handle = cpu_to_le16(conn->handle);
370 memcpy(cp.ltk, ltk, key_size);
372 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
375 /* Device _must_ be locked */
376 void hci_sco_setup(struct hci_conn *conn, __u8 status)
378 struct hci_conn *sco = conn->link;
383 BT_DBG("hcon %p", conn);
386 if (lmp_esco_capable(conn->hdev))
387 hci_setup_sync(sco, conn->handle);
389 hci_add_sco(sco, conn->handle);
391 hci_connect_cfm(sco, status);
396 static void hci_conn_timeout(struct work_struct *work)
398 struct hci_conn *conn = container_of(work, struct hci_conn,
400 int refcnt = atomic_read(&conn->refcnt);
402 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
406 /* FIXME: It was observed that in pairing failed scenario, refcnt
407 * drops below 0. Probably this is because l2cap_conn_del calls
408 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
409 * dropped. After that loop hci_chan_del is called which also drops
410 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
416 /* LE connections in scanning state need special handling */
417 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
418 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
419 hci_connect_le_scan_remove(conn);
423 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
426 /* Enter sniff mode */
427 static void hci_conn_idle(struct work_struct *work)
429 struct hci_conn *conn = container_of(work, struct hci_conn,
431 struct hci_dev *hdev = conn->hdev;
433 BT_DBG("hcon %p mode %d", conn, conn->mode);
435 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
438 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
441 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
442 struct hci_cp_sniff_subrate cp;
443 cp.handle = cpu_to_le16(conn->handle);
444 cp.max_latency = cpu_to_le16(0);
445 cp.min_remote_timeout = cpu_to_le16(0);
446 cp.min_local_timeout = cpu_to_le16(0);
447 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
450 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
451 struct hci_cp_sniff_mode cp;
452 cp.handle = cpu_to_le16(conn->handle);
453 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
454 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
455 cp.attempt = cpu_to_le16(4);
456 cp.timeout = cpu_to_le16(1);
457 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
461 static void hci_conn_auto_accept(struct work_struct *work)
463 struct hci_conn *conn = container_of(work, struct hci_conn,
464 auto_accept_work.work);
466 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
470 static void le_conn_timeout(struct work_struct *work)
472 struct hci_conn *conn = container_of(work, struct hci_conn,
473 le_conn_timeout.work);
474 struct hci_dev *hdev = conn->hdev;
478 /* We could end up here due to having done directed advertising,
479 * so clean up the state if necessary. This should however only
480 * happen with broken hardware or if low duty cycle was used
481 * (which doesn't have a timeout of its own).
483 if (conn->role == HCI_ROLE_SLAVE) {
485 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
487 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
491 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
494 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
497 struct hci_conn *conn;
499 BT_DBG("%s dst %pMR", hdev->name, dst);
501 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
505 bacpy(&conn->dst, dst);
506 bacpy(&conn->src, &hdev->bdaddr);
510 conn->mode = HCI_CM_ACTIVE;
511 conn->state = BT_OPEN;
512 conn->auth_type = HCI_AT_GENERAL_BONDING;
513 conn->io_capability = hdev->io_capability;
514 conn->remote_auth = 0xff;
515 conn->key_type = 0xff;
516 conn->rssi = HCI_RSSI_INVALID;
517 conn->tx_power = HCI_TX_POWER_INVALID;
518 conn->max_tx_power = HCI_TX_POWER_INVALID;
520 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
521 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
523 if (conn->role == HCI_ROLE_MASTER)
528 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
531 /* conn->src should reflect the local identity address */
532 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
535 if (lmp_esco_capable(hdev))
536 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
537 (hdev->esco_type & EDR_ESCO_MASK);
539 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
542 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
546 skb_queue_head_init(&conn->data_q);
548 INIT_LIST_HEAD(&conn->chan_list);
550 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
551 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
552 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
553 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
554 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
556 atomic_set(&conn->refcnt, 0);
560 hci_conn_hash_add(hdev, conn);
562 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
564 hci_conn_init_sysfs(conn);
569 int hci_conn_del(struct hci_conn *conn)
571 struct hci_dev *hdev = conn->hdev;
573 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
575 cancel_delayed_work_sync(&conn->disc_work);
576 cancel_delayed_work_sync(&conn->auto_accept_work);
577 cancel_delayed_work_sync(&conn->idle_work);
579 if (conn->type == ACL_LINK) {
580 struct hci_conn *sco = conn->link;
585 hdev->acl_cnt += conn->sent;
586 } else if (conn->type == LE_LINK) {
587 cancel_delayed_work(&conn->le_conn_timeout);
590 hdev->le_cnt += conn->sent;
592 hdev->acl_cnt += conn->sent;
594 struct hci_conn *acl = conn->link;
602 amp_mgr_put(conn->amp_mgr);
604 skb_queue_purge(&conn->data_q);
606 /* Remove the connection from the list and cleanup its remaining
607 * state. This is a separate function since for some cases like
608 * BT_CONNECT_SCAN we *only* want the cleanup part without the
609 * rest of hci_conn_del.
611 hci_conn_cleanup(conn);
616 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
618 int use_src = bacmp(src, BDADDR_ANY);
619 struct hci_dev *hdev = NULL, *d;
621 BT_DBG("%pMR -> %pMR", src, dst);
623 read_lock(&hci_dev_list_lock);
625 list_for_each_entry(d, &hci_dev_list, list) {
626 if (!test_bit(HCI_UP, &d->flags) ||
627 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
628 d->dev_type != HCI_PRIMARY)
632 * No source address - find interface with bdaddr != dst
633 * Source address - find interface with bdaddr == src
640 if (src_type == BDADDR_BREDR) {
641 if (!lmp_bredr_capable(d))
643 bacpy(&id_addr, &d->bdaddr);
644 id_addr_type = BDADDR_BREDR;
646 if (!lmp_le_capable(d))
649 hci_copy_identity_address(d, &id_addr,
652 /* Convert from HCI to three-value type */
653 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
654 id_addr_type = BDADDR_LE_PUBLIC;
656 id_addr_type = BDADDR_LE_RANDOM;
659 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
663 if (bacmp(&d->bdaddr, dst)) {
670 hdev = hci_dev_hold(hdev);
672 read_unlock(&hci_dev_list_lock);
675 EXPORT_SYMBOL(hci_get_route);
677 /* This function requires the caller holds hdev->lock */
678 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
680 struct hci_dev *hdev = conn->hdev;
681 struct hci_conn_params *params;
683 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
685 if (params && params->conn) {
686 hci_conn_drop(params->conn);
687 hci_conn_put(params->conn);
691 conn->state = BT_CLOSED;
693 /* If the status indicates successful cancellation of
694 * the attempt (i.e. Unkown Connection Id) there's no point of
695 * notifying failure since we'll go back to keep trying to
696 * connect. The only exception is explicit connect requests
697 * where a timeout + cancel does indicate an actual failure.
699 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
700 (params && params->explicit_connect))
701 mgmt_connect_failed(hdev, &conn->dst, conn->type,
702 conn->dst_type, status);
704 hci_connect_cfm(conn, status);
708 /* Since we may have temporarily stopped the background scanning in
709 * favor of connection establishment, we should restart it.
711 hci_update_background_scan(hdev);
713 /* Re-enable advertising in case this was a failed connection
714 * attempt as a peripheral.
716 hci_req_reenable_advertising(hdev);
719 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
721 struct hci_conn *conn;
725 conn = hci_lookup_le_connect(hdev);
728 hci_connect_le_scan_cleanup(conn);
732 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
738 hci_le_conn_failed(conn, status);
741 hci_dev_unlock(hdev);
744 static bool conn_use_rpa(struct hci_conn *conn)
746 struct hci_dev *hdev = conn->hdev;
748 return hci_dev_test_flag(hdev, HCI_PRIVACY);
751 static void hci_req_add_le_create_conn(struct hci_request *req,
752 struct hci_conn *conn,
753 bdaddr_t *direct_rpa)
755 struct hci_cp_le_create_conn cp;
756 struct hci_dev *hdev = conn->hdev;
759 /* If direct address was provided we use it instead of current
763 if (bacmp(&req->hdev->random_addr, direct_rpa))
764 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
767 /* direct address is always RPA */
768 own_addr_type = ADDR_LE_DEV_RANDOM;
770 /* Update random address, but set require_privacy to false so
771 * that we never connect with an non-resolvable address.
773 if (hci_update_random_address(req, false, conn_use_rpa(conn),
778 memset(&cp, 0, sizeof(cp));
780 /* Set window to be the same value as the interval to enable
781 * continuous scanning.
783 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
784 cp.scan_window = cp.scan_interval;
786 bacpy(&cp.peer_addr, &conn->dst);
787 cp.peer_addr_type = conn->dst_type;
788 cp.own_address_type = own_addr_type;
789 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
790 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
791 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
792 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
793 cp.min_ce_len = cpu_to_le16(0x0000);
794 cp.max_ce_len = cpu_to_le16(0x0000);
796 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
798 conn->state = BT_CONNECT;
799 clear_bit(HCI_CONN_SCANNING, &conn->flags);
802 static void hci_req_directed_advertising(struct hci_request *req,
803 struct hci_conn *conn)
805 struct hci_dev *hdev = req->hdev;
806 struct hci_cp_le_set_adv_param cp;
810 /* Clear the HCI_LE_ADV bit temporarily so that the
811 * hci_update_random_address knows that it's safe to go ahead
812 * and write a new random address. The flag will be set back on
813 * as soon as the SET_ADV_ENABLE HCI command completes.
815 hci_dev_clear_flag(hdev, HCI_LE_ADV);
817 /* Set require_privacy to false so that the remote device has a
818 * chance of identifying us.
820 if (hci_update_random_address(req, false, conn_use_rpa(conn),
824 memset(&cp, 0, sizeof(cp));
825 cp.type = LE_ADV_DIRECT_IND;
826 cp.own_address_type = own_addr_type;
827 cp.direct_addr_type = conn->dst_type;
828 bacpy(&cp.direct_addr, &conn->dst);
829 cp.channel_map = hdev->le_adv_channel_map;
831 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
834 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
836 conn->state = BT_CONNECT;
839 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
840 u8 dst_type, u8 sec_level, u16 conn_timeout,
841 u8 role, bdaddr_t *direct_rpa)
843 struct hci_conn_params *params;
844 struct hci_conn *conn;
846 struct hci_request req;
849 /* Let's make sure that le is enabled.*/
850 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
851 if (lmp_le_capable(hdev))
852 return ERR_PTR(-ECONNREFUSED);
854 return ERR_PTR(-EOPNOTSUPP);
857 /* Since the controller supports only one LE connection attempt at a
858 * time, we return -EBUSY if there is any connection attempt running.
860 if (hci_lookup_le_connect(hdev))
861 return ERR_PTR(-EBUSY);
863 /* If there's already a connection object but it's not in
864 * scanning state it means it must already be established, in
865 * which case we can't do anything else except report a failure
868 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
869 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
870 return ERR_PTR(-EBUSY);
873 /* When given an identity address with existing identity
874 * resolving key, the connection needs to be established
875 * to a resolvable random address.
877 * Storing the resolvable random address is required here
878 * to handle connection failures. The address will later
879 * be resolved back into the original identity address
880 * from the connect request.
882 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
883 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
885 dst_type = ADDR_LE_DEV_RANDOM;
889 bacpy(&conn->dst, dst);
891 conn = hci_conn_add(hdev, LE_LINK, dst, role);
893 return ERR_PTR(-ENOMEM);
895 conn->pending_sec_level = sec_level;
898 conn->dst_type = dst_type;
899 conn->sec_level = BT_SECURITY_LOW;
900 conn->conn_timeout = conn_timeout;
902 hci_req_init(&req, hdev);
904 /* Disable advertising if we're active. For master role
905 * connections most controllers will refuse to connect if
906 * advertising is enabled, and for slave role connections we
907 * anyway have to disable it in order to start directed
910 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
912 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
916 /* If requested to connect as slave use directed advertising */
917 if (conn->role == HCI_ROLE_SLAVE) {
918 /* If we're active scanning most controllers are unable
919 * to initiate advertising. Simply reject the attempt.
921 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
922 hdev->le_scan_type == LE_SCAN_ACTIVE) {
923 skb_queue_purge(&req.cmd_q);
925 return ERR_PTR(-EBUSY);
928 hci_req_directed_advertising(&req, conn);
932 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
934 conn->le_conn_min_interval = params->conn_min_interval;
935 conn->le_conn_max_interval = params->conn_max_interval;
936 conn->le_conn_latency = params->conn_latency;
937 conn->le_supv_timeout = params->supervision_timeout;
939 conn->le_conn_min_interval = hdev->le_conn_min_interval;
940 conn->le_conn_max_interval = hdev->le_conn_max_interval;
941 conn->le_conn_latency = hdev->le_conn_latency;
942 conn->le_supv_timeout = hdev->le_supv_timeout;
945 /* If controller is scanning, we stop it since some controllers are
946 * not able to scan and connect at the same time. Also set the
947 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
948 * handler for scan disabling knows to set the correct discovery
951 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
952 hci_req_add_le_scan_disable(&req);
953 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
956 hci_req_add_le_create_conn(&req, conn, direct_rpa);
959 err = hci_req_run(&req, create_le_conn_complete);
968 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
970 struct hci_conn *conn;
972 conn = hci_conn_hash_lookup_le(hdev, addr, type);
976 if (conn->state != BT_CONNECTED)
982 /* This function requires the caller holds hdev->lock */
983 static int hci_explicit_conn_params_set(struct hci_dev *hdev,
984 bdaddr_t *addr, u8 addr_type)
986 struct hci_conn_params *params;
988 if (is_connected(hdev, addr, addr_type))
991 params = hci_conn_params_lookup(hdev, addr, addr_type);
993 params = hci_conn_params_add(hdev, addr, addr_type);
997 /* If we created new params, mark them to be deleted in
998 * hci_connect_le_scan_cleanup. It's different case than
999 * existing disabled params, those will stay after cleanup.
1001 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1004 /* We're trying to connect, so make sure params are at pend_le_conns */
1005 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1006 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1007 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1008 list_del_init(¶ms->action);
1009 list_add(¶ms->action, &hdev->pend_le_conns);
1012 params->explicit_connect = true;
1014 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1015 params->auto_connect);
1020 /* This function requires the caller holds hdev->lock */
1021 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1022 u8 dst_type, u8 sec_level,
1025 struct hci_conn *conn;
1027 /* Let's make sure that le is enabled.*/
1028 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1029 if (lmp_le_capable(hdev))
1030 return ERR_PTR(-ECONNREFUSED);
1032 return ERR_PTR(-EOPNOTSUPP);
1035 /* Some devices send ATT messages as soon as the physical link is
1036 * established. To be able to handle these ATT messages, the user-
1037 * space first establishes the connection and then starts the pairing
1040 * So if a hci_conn object already exists for the following connection
1041 * attempt, we simply update pending_sec_level and auth_type fields
1042 * and return the object found.
1044 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1046 if (conn->pending_sec_level < sec_level)
1047 conn->pending_sec_level = sec_level;
1051 BT_DBG("requesting refresh of dst_addr");
1053 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1055 return ERR_PTR(-ENOMEM);
1057 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1059 return ERR_PTR(-EBUSY);
1062 conn->state = BT_CONNECT;
1063 set_bit(HCI_CONN_SCANNING, &conn->flags);
1064 conn->dst_type = dst_type;
1065 conn->sec_level = BT_SECURITY_LOW;
1066 conn->pending_sec_level = sec_level;
1067 conn->conn_timeout = conn_timeout;
1069 hci_update_background_scan(hdev);
1072 hci_conn_hold(conn);
1076 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1077 u8 sec_level, u8 auth_type)
1079 struct hci_conn *acl;
1081 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1082 if (lmp_bredr_capable(hdev))
1083 return ERR_PTR(-ECONNREFUSED);
1085 return ERR_PTR(-EOPNOTSUPP);
1088 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1090 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1092 return ERR_PTR(-ENOMEM);
1097 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1098 acl->sec_level = BT_SECURITY_LOW;
1099 acl->pending_sec_level = sec_level;
1100 acl->auth_type = auth_type;
1101 hci_acl_create_connection(acl);
1107 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1110 struct hci_conn *acl;
1111 struct hci_conn *sco;
1113 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1117 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1119 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1122 return ERR_PTR(-ENOMEM);
1131 sco->setting = setting;
1133 if (acl->state == BT_CONNECTED &&
1134 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1135 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1136 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1138 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1139 /* defer SCO setup until mode change completed */
1140 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1144 hci_sco_setup(acl, 0x00);
1150 /* Check link security requirement */
1151 int hci_conn_check_link_mode(struct hci_conn *conn)
1153 BT_DBG("hcon %p", conn);
1155 /* In Secure Connections Only mode, it is required that Secure
1156 * Connections is used and the link is encrypted with AES-CCM
1157 * using a P-256 authenticated combination key.
1159 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1160 if (!hci_conn_sc_enabled(conn) ||
1161 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1162 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1166 /* AES encryption is required for Level 4:
1168 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
1171 * 128-bit equivalent strength for link and encryption keys
1172 * required using FIPS approved algorithms (E0 not allowed,
1173 * SAFER+ not allowed, and P-192 not allowed; encryption key
1176 if (conn->sec_level == BT_SECURITY_FIPS &&
1177 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
1178 bt_dev_err(conn->hdev,
1179 "Invalid security: Missing AES-CCM usage");
1183 if (hci_conn_ssp_enabled(conn) &&
1184 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1190 /* Authenticate remote device */
1191 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1193 BT_DBG("hcon %p", conn);
1195 if (conn->pending_sec_level > sec_level)
1196 sec_level = conn->pending_sec_level;
1198 if (sec_level > conn->sec_level)
1199 conn->pending_sec_level = sec_level;
1200 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1203 /* Make sure we preserve an existing MITM requirement*/
1204 auth_type |= (conn->auth_type & 0x01);
1206 conn->auth_type = auth_type;
1208 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1209 struct hci_cp_auth_requested cp;
1211 cp.handle = cpu_to_le16(conn->handle);
1212 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1215 /* If we're already encrypted set the REAUTH_PEND flag,
1216 * otherwise set the ENCRYPT_PEND.
1218 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1219 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1221 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1227 /* Encrypt the the link */
1228 static void hci_conn_encrypt(struct hci_conn *conn)
1230 BT_DBG("hcon %p", conn);
1232 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1233 struct hci_cp_set_conn_encrypt cp;
1234 cp.handle = cpu_to_le16(conn->handle);
1236 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1241 /* Enable security */
1242 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1245 BT_DBG("hcon %p", conn);
1247 if (conn->type == LE_LINK)
1248 return smp_conn_security(conn, sec_level);
1250 /* For sdp we don't need the link key. */
1251 if (sec_level == BT_SECURITY_SDP)
1254 /* For non 2.1 devices and low security level we don't need the link
1256 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1259 /* For other security levels we need the link key. */
1260 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1263 /* An authenticated FIPS approved combination key has sufficient
1264 * security for security level 4. */
1265 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1266 sec_level == BT_SECURITY_FIPS)
1269 /* An authenticated combination key has sufficient security for
1270 security level 3. */
1271 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1272 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1273 sec_level == BT_SECURITY_HIGH)
1276 /* An unauthenticated combination key has sufficient security for
1277 security level 1 and 2. */
1278 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1279 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1280 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1283 /* A combination key has always sufficient security for the security
1284 levels 1 or 2. High security level requires the combination key
1285 is generated using maximum PIN code length (16).
1286 For pre 2.1 units. */
1287 if (conn->key_type == HCI_LK_COMBINATION &&
1288 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1289 conn->pin_length == 16))
1293 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1297 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1299 if (!hci_conn_auth(conn, sec_level, auth_type))
1303 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1304 /* Ensure that the encryption key size has been read,
1305 * otherwise stall the upper layer responses.
1307 if (!conn->enc_key_size)
1310 /* Nothing else needed, all requirements are met */
1314 hci_conn_encrypt(conn);
1317 EXPORT_SYMBOL(hci_conn_security);
1319 /* Check secure link requirement */
1320 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1322 BT_DBG("hcon %p", conn);
1324 /* Accept if non-secure or higher security level is required */
1325 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1328 /* Accept if secure or higher security level is already present */
1329 if (conn->sec_level == BT_SECURITY_HIGH ||
1330 conn->sec_level == BT_SECURITY_FIPS)
1333 /* Reject not secure link */
1336 EXPORT_SYMBOL(hci_conn_check_secure);
1339 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1341 BT_DBG("hcon %p", conn);
1343 if (role == conn->role)
1346 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1347 struct hci_cp_switch_role cp;
1348 bacpy(&cp.bdaddr, &conn->dst);
1350 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1355 EXPORT_SYMBOL(hci_conn_switch_role);
1357 /* Enter active mode */
1358 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1360 struct hci_dev *hdev = conn->hdev;
1362 BT_DBG("hcon %p mode %d", conn, conn->mode);
1364 if (conn->mode != HCI_CM_SNIFF)
1367 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1370 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1371 struct hci_cp_exit_sniff_mode cp;
1372 cp.handle = cpu_to_le16(conn->handle);
1373 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1377 if (hdev->idle_timeout > 0)
1378 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1379 msecs_to_jiffies(hdev->idle_timeout));
1382 /* Drop all connection on the device */
1383 void hci_conn_hash_flush(struct hci_dev *hdev)
1385 struct hci_conn_hash *h = &hdev->conn_hash;
1386 struct hci_conn *c, *n;
1388 BT_DBG("hdev %s", hdev->name);
1390 list_for_each_entry_safe(c, n, &h->list, list) {
1391 c->state = BT_CLOSED;
1393 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1398 /* Check pending connect attempts */
1399 void hci_conn_check_pending(struct hci_dev *hdev)
1401 struct hci_conn *conn;
1403 BT_DBG("hdev %s", hdev->name);
1407 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1409 hci_acl_create_connection(conn);
1411 hci_dev_unlock(hdev);
1414 static u32 get_link_mode(struct hci_conn *conn)
1418 if (conn->role == HCI_ROLE_MASTER)
1419 link_mode |= HCI_LM_MASTER;
1421 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1422 link_mode |= HCI_LM_ENCRYPT;
1424 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1425 link_mode |= HCI_LM_AUTH;
1427 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1428 link_mode |= HCI_LM_SECURE;
1430 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1431 link_mode |= HCI_LM_FIPS;
1436 int hci_get_conn_list(void __user *arg)
1439 struct hci_conn_list_req req, *cl;
1440 struct hci_conn_info *ci;
1441 struct hci_dev *hdev;
1442 int n = 0, size, err;
1444 if (copy_from_user(&req, arg, sizeof(req)))
1447 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1450 size = sizeof(req) + req.conn_num * sizeof(*ci);
1452 cl = kmalloc(size, GFP_KERNEL);
1456 hdev = hci_dev_get(req.dev_id);
1465 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1466 bacpy(&(ci + n)->bdaddr, &c->dst);
1467 (ci + n)->handle = c->handle;
1468 (ci + n)->type = c->type;
1469 (ci + n)->out = c->out;
1470 (ci + n)->state = c->state;
1471 (ci + n)->link_mode = get_link_mode(c);
1472 if (++n >= req.conn_num)
1475 hci_dev_unlock(hdev);
1477 cl->dev_id = hdev->id;
1479 size = sizeof(req) + n * sizeof(*ci);
1483 err = copy_to_user(arg, cl, size);
1486 return err ? -EFAULT : 0;
1489 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1491 struct hci_conn_info_req req;
1492 struct hci_conn_info ci;
1493 struct hci_conn *conn;
1494 char __user *ptr = arg + sizeof(req);
1496 if (copy_from_user(&req, arg, sizeof(req)))
1500 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1502 bacpy(&ci.bdaddr, &conn->dst);
1503 ci.handle = conn->handle;
1504 ci.type = conn->type;
1506 ci.state = conn->state;
1507 ci.link_mode = get_link_mode(conn);
1509 hci_dev_unlock(hdev);
1514 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1517 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1519 struct hci_auth_info_req req;
1520 struct hci_conn *conn;
1522 if (copy_from_user(&req, arg, sizeof(req)))
1526 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1528 req.type = conn->auth_type;
1529 hci_dev_unlock(hdev);
1534 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1537 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1539 struct hci_dev *hdev = conn->hdev;
1540 struct hci_chan *chan;
1542 BT_DBG("%s hcon %p", hdev->name, conn);
1544 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1545 BT_DBG("Refusing to create new hci_chan");
1549 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1553 chan->conn = hci_conn_get(conn);
1554 skb_queue_head_init(&chan->data_q);
1555 chan->state = BT_CONNECTED;
1557 list_add_rcu(&chan->list, &conn->chan_list);
1562 void hci_chan_del(struct hci_chan *chan)
1564 struct hci_conn *conn = chan->conn;
1565 struct hci_dev *hdev = conn->hdev;
1567 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1569 list_del_rcu(&chan->list);
1573 /* Prevent new hci_chan's to be created for this hci_conn */
1574 set_bit(HCI_CONN_DROP, &conn->flags);
1578 skb_queue_purge(&chan->data_q);
1582 void hci_chan_list_flush(struct hci_conn *conn)
1584 struct hci_chan *chan, *n;
1586 BT_DBG("hcon %p", conn);
1588 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1592 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1595 struct hci_chan *hchan;
1597 list_for_each_entry(hchan, &hcon->chan_list, list) {
1598 if (hchan->handle == handle)
1605 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1607 struct hci_conn_hash *h = &hdev->conn_hash;
1608 struct hci_conn *hcon;
1609 struct hci_chan *hchan = NULL;
1613 list_for_each_entry_rcu(hcon, &h->list, list) {
1614 hchan = __hci_chan_lookup_handle(hcon, handle);