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 static void hci_le_create_connection_cancel(struct hci_conn *conn)
64 hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
67 /* This function requires the caller holds hdev->lock */
68 static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
70 struct hci_conn_params *params;
76 bdaddr_type = conn->dst_type;
78 /* Check if we need to convert to identity address */
79 irk = hci_get_irk(conn->hdev, bdaddr, bdaddr_type);
81 bdaddr = &irk->bdaddr;
82 bdaddr_type = irk->addr_type;
85 params = hci_explicit_connect_lookup(conn->hdev, bdaddr, bdaddr_type);
89 /* The connection attempt was doing scan for new RPA, and is
90 * in scan phase. If params are not associated with any other
91 * autoconnect action, remove them completely. If they are, just unmark
92 * them as waiting for connection, by clearing explicit_connect field.
94 params->explicit_connect = false;
96 list_del_init(¶ms->action);
98 switch (params->auto_connect) {
99 case HCI_AUTO_CONN_EXPLICIT:
100 hci_conn_params_del(conn->hdev, bdaddr, bdaddr_type);
101 /* return instead of break to avoid duplicate scan update */
103 case HCI_AUTO_CONN_DIRECT:
104 case HCI_AUTO_CONN_ALWAYS:
105 list_add(¶ms->action, &conn->hdev->pend_le_conns);
107 case HCI_AUTO_CONN_REPORT:
108 list_add(¶ms->action, &conn->hdev->pend_le_reports);
114 hci_update_background_scan(conn->hdev);
117 static void hci_conn_cleanup(struct hci_conn *conn)
119 struct hci_dev *hdev = conn->hdev;
121 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
122 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
124 hci_chan_list_flush(conn);
126 hci_conn_hash_del(hdev, conn);
129 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
131 hci_conn_del_sysfs(conn);
133 debugfs_remove_recursive(conn->debugfs);
140 /* This function requires the caller holds hdev->lock */
141 static void hci_connect_le_scan_remove(struct hci_conn *conn)
143 hci_connect_le_scan_cleanup(conn);
145 /* We can't call hci_conn_del here since that would deadlock
146 * with trying to call cancel_delayed_work_sync(&conn->disc_work).
147 * Instead, call just hci_conn_cleanup() which contains the bare
148 * minimum cleanup operations needed for a connection in this
151 hci_conn_cleanup(conn);
154 static void hci_acl_create_connection(struct hci_conn *conn)
156 struct hci_dev *hdev = conn->hdev;
157 struct inquiry_entry *ie;
158 struct hci_cp_create_conn cp;
160 BT_DBG("hcon %p", conn);
162 conn->state = BT_CONNECT;
164 conn->role = HCI_ROLE_MASTER;
168 conn->link_policy = hdev->link_policy;
170 memset(&cp, 0, sizeof(cp));
171 bacpy(&cp.bdaddr, &conn->dst);
172 cp.pscan_rep_mode = 0x02;
174 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
176 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
177 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
178 cp.pscan_mode = ie->data.pscan_mode;
179 cp.clock_offset = ie->data.clock_offset |
183 memcpy(conn->dev_class, ie->data.dev_class, 3);
184 if (ie->data.ssp_mode > 0)
185 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
188 cp.pkt_type = cpu_to_le16(conn->pkt_type);
189 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
190 cp.role_switch = 0x01;
192 cp.role_switch = 0x00;
194 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
197 static void hci_acl_create_connection_cancel(struct hci_conn *conn)
199 struct hci_cp_create_conn_cancel cp;
201 BT_DBG("hcon %p", conn);
203 if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
206 bacpy(&cp.bdaddr, &conn->dst);
207 hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
210 static void hci_reject_sco(struct hci_conn *conn)
212 struct hci_cp_reject_sync_conn_req cp;
214 cp.reason = HCI_ERROR_REJ_LIMITED_RESOURCES;
215 bacpy(&cp.bdaddr, &conn->dst);
217 hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
220 int hci_disconnect(struct hci_conn *conn, __u8 reason)
222 struct hci_cp_disconnect cp;
224 BT_DBG("hcon %p", conn);
226 /* When we are master of an established connection and it enters
227 * the disconnect timeout, then go ahead and try to read the
228 * current clock offset. Processing of the result is done
229 * within the event handling and hci_clock_offset_evt function.
231 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER) {
232 struct hci_dev *hdev = conn->hdev;
233 struct hci_cp_read_clock_offset clkoff_cp;
235 clkoff_cp.handle = cpu_to_le16(conn->handle);
236 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
240 conn->state = BT_DISCONN;
242 cp.handle = cpu_to_le16(conn->handle);
244 return hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
247 static void hci_amp_disconn(struct hci_conn *conn)
249 struct hci_cp_disconn_phy_link cp;
251 BT_DBG("hcon %p", conn);
253 conn->state = BT_DISCONN;
255 cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
256 cp.reason = hci_proto_disconn_ind(conn);
257 hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
261 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
263 struct hci_dev *hdev = conn->hdev;
264 struct hci_cp_add_sco cp;
266 BT_DBG("hcon %p", conn);
268 conn->state = BT_CONNECT;
273 cp.handle = cpu_to_le16(handle);
274 cp.pkt_type = cpu_to_le16(conn->pkt_type);
276 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
279 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
281 struct hci_dev *hdev = conn->hdev;
282 struct hci_cp_setup_sync_conn cp;
283 const struct sco_param *param;
285 BT_DBG("hcon %p", conn);
287 conn->state = BT_CONNECT;
292 cp.handle = cpu_to_le16(handle);
294 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
295 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
296 cp.voice_setting = cpu_to_le16(conn->setting);
298 switch (conn->setting & SCO_AIRMODE_MASK) {
299 case SCO_AIRMODE_TRANSP:
300 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
302 param = &esco_param_msbc[conn->attempt - 1];
304 case SCO_AIRMODE_CVSD:
305 if (lmp_esco_capable(conn->link)) {
306 if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
308 param = &esco_param_cvsd[conn->attempt - 1];
310 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
312 param = &sco_param_cvsd[conn->attempt - 1];
319 cp.retrans_effort = param->retrans_effort;
320 cp.pkt_type = __cpu_to_le16(param->pkt_type);
321 cp.max_latency = __cpu_to_le16(param->max_latency);
323 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
329 u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
332 struct hci_dev *hdev = conn->hdev;
333 struct hci_conn_params *params;
334 struct hci_cp_le_conn_update cp;
338 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
340 params->conn_min_interval = min;
341 params->conn_max_interval = max;
342 params->conn_latency = latency;
343 params->supervision_timeout = to_multiplier;
346 hci_dev_unlock(hdev);
348 memset(&cp, 0, sizeof(cp));
349 cp.handle = cpu_to_le16(conn->handle);
350 cp.conn_interval_min = cpu_to_le16(min);
351 cp.conn_interval_max = cpu_to_le16(max);
352 cp.conn_latency = cpu_to_le16(latency);
353 cp.supervision_timeout = cpu_to_le16(to_multiplier);
354 cp.min_ce_len = cpu_to_le16(0x0000);
355 cp.max_ce_len = cpu_to_le16(0x0000);
357 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
365 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
366 __u8 ltk[16], __u8 key_size)
368 struct hci_dev *hdev = conn->hdev;
369 struct hci_cp_le_start_enc cp;
371 BT_DBG("hcon %p", conn);
373 memset(&cp, 0, sizeof(cp));
375 cp.handle = cpu_to_le16(conn->handle);
378 memcpy(cp.ltk, ltk, key_size);
380 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
383 /* Device _must_ be locked */
384 void hci_sco_setup(struct hci_conn *conn, __u8 status)
386 struct hci_conn *sco = conn->link;
391 BT_DBG("hcon %p", conn);
394 if (lmp_esco_capable(conn->hdev))
395 hci_setup_sync(sco, conn->handle);
397 hci_add_sco(sco, conn->handle);
399 hci_connect_cfm(sco, status);
404 static void hci_conn_timeout(struct work_struct *work)
406 struct hci_conn *conn = container_of(work, struct hci_conn,
408 int refcnt = atomic_read(&conn->refcnt);
410 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
414 /* FIXME: It was observed that in pairing failed scenario, refcnt
415 * drops below 0. Probably this is because l2cap_conn_del calls
416 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
417 * dropped. After that loop hci_chan_del is called which also drops
418 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
424 switch (conn->state) {
428 if (conn->type == ACL_LINK)
429 hci_acl_create_connection_cancel(conn);
430 else if (conn->type == LE_LINK) {
431 if (test_bit(HCI_CONN_SCANNING, &conn->flags))
432 hci_connect_le_scan_remove(conn);
434 hci_le_create_connection_cancel(conn);
436 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
437 hci_reject_sco(conn);
442 if (conn->type == AMP_LINK) {
443 hci_amp_disconn(conn);
445 __u8 reason = hci_proto_disconn_ind(conn);
446 hci_disconnect(conn, reason);
450 conn->state = BT_CLOSED;
455 /* Enter sniff mode */
456 static void hci_conn_idle(struct work_struct *work)
458 struct hci_conn *conn = container_of(work, struct hci_conn,
460 struct hci_dev *hdev = conn->hdev;
462 BT_DBG("hcon %p mode %d", conn, conn->mode);
464 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
467 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
470 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
471 struct hci_cp_sniff_subrate cp;
472 cp.handle = cpu_to_le16(conn->handle);
473 cp.max_latency = cpu_to_le16(0);
474 cp.min_remote_timeout = cpu_to_le16(0);
475 cp.min_local_timeout = cpu_to_le16(0);
476 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
479 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
480 struct hci_cp_sniff_mode cp;
481 cp.handle = cpu_to_le16(conn->handle);
482 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
483 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
484 cp.attempt = cpu_to_le16(4);
485 cp.timeout = cpu_to_le16(1);
486 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
490 static void hci_conn_auto_accept(struct work_struct *work)
492 struct hci_conn *conn = container_of(work, struct hci_conn,
493 auto_accept_work.work);
495 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
499 static void le_conn_timeout(struct work_struct *work)
501 struct hci_conn *conn = container_of(work, struct hci_conn,
502 le_conn_timeout.work);
503 struct hci_dev *hdev = conn->hdev;
507 /* We could end up here due to having done directed advertising,
508 * so clean up the state if necessary. This should however only
509 * happen with broken hardware or if low duty cycle was used
510 * (which doesn't have a timeout of its own).
512 if (conn->role == HCI_ROLE_SLAVE) {
514 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
516 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
520 hci_le_create_connection_cancel(conn);
523 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
526 struct hci_conn *conn;
528 BT_DBG("%s dst %pMR", hdev->name, dst);
530 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
534 bacpy(&conn->dst, dst);
535 bacpy(&conn->src, &hdev->bdaddr);
539 conn->mode = HCI_CM_ACTIVE;
540 conn->state = BT_OPEN;
541 conn->auth_type = HCI_AT_GENERAL_BONDING;
542 conn->io_capability = hdev->io_capability;
543 conn->remote_auth = 0xff;
544 conn->key_type = 0xff;
545 conn->rssi = HCI_RSSI_INVALID;
546 conn->tx_power = HCI_TX_POWER_INVALID;
547 conn->max_tx_power = HCI_TX_POWER_INVALID;
549 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
550 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
552 if (conn->role == HCI_ROLE_MASTER)
557 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
560 /* conn->src should reflect the local identity address */
561 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
564 if (lmp_esco_capable(hdev))
565 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
566 (hdev->esco_type & EDR_ESCO_MASK);
568 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
571 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
575 skb_queue_head_init(&conn->data_q);
577 INIT_LIST_HEAD(&conn->chan_list);
579 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
580 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
581 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
582 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
584 atomic_set(&conn->refcnt, 0);
588 hci_conn_hash_add(hdev, conn);
590 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
592 hci_conn_init_sysfs(conn);
597 int hci_conn_del(struct hci_conn *conn)
599 struct hci_dev *hdev = conn->hdev;
601 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
603 cancel_delayed_work_sync(&conn->disc_work);
604 cancel_delayed_work_sync(&conn->auto_accept_work);
605 cancel_delayed_work_sync(&conn->idle_work);
607 if (conn->type == ACL_LINK) {
608 struct hci_conn *sco = conn->link;
613 hdev->acl_cnt += conn->sent;
614 } else if (conn->type == LE_LINK) {
615 cancel_delayed_work(&conn->le_conn_timeout);
618 hdev->le_cnt += conn->sent;
620 hdev->acl_cnt += conn->sent;
622 struct hci_conn *acl = conn->link;
630 amp_mgr_put(conn->amp_mgr);
632 skb_queue_purge(&conn->data_q);
634 /* Remove the connection from the list and cleanup its remaining
635 * state. This is a separate function since for some cases like
636 * BT_CONNECT_SCAN we *only* want the cleanup part without the
637 * rest of hci_conn_del.
639 hci_conn_cleanup(conn);
644 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
646 int use_src = bacmp(src, BDADDR_ANY);
647 struct hci_dev *hdev = NULL, *d;
649 BT_DBG("%pMR -> %pMR", src, dst);
651 read_lock(&hci_dev_list_lock);
653 list_for_each_entry(d, &hci_dev_list, list) {
654 if (!test_bit(HCI_UP, &d->flags) ||
655 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
656 d->dev_type != HCI_BREDR)
660 * No source address - find interface with bdaddr != dst
661 * Source address - find interface with bdaddr == src
665 if (!bacmp(&d->bdaddr, src)) {
669 if (bacmp(&d->bdaddr, dst)) {
676 hdev = hci_dev_hold(hdev);
678 read_unlock(&hci_dev_list_lock);
681 EXPORT_SYMBOL(hci_get_route);
683 /* This function requires the caller holds hdev->lock */
684 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
686 struct hci_dev *hdev = conn->hdev;
687 struct hci_conn_params *params;
689 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
691 if (params && params->conn) {
692 hci_conn_drop(params->conn);
693 hci_conn_put(params->conn);
697 conn->state = BT_CLOSED;
699 mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
702 hci_connect_cfm(conn, status);
706 /* Since we may have temporarily stopped the background scanning in
707 * favor of connection establishment, we should restart it.
709 hci_update_background_scan(hdev);
711 /* Re-enable advertising in case this was a failed connection
712 * attempt as a peripheral.
714 mgmt_reenable_advertising(hdev);
717 static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
719 struct hci_conn *conn;
723 conn = hci_lookup_le_connect(hdev);
726 hci_connect_le_scan_cleanup(conn);
730 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
736 hci_le_conn_failed(conn, status);
739 hci_dev_unlock(hdev);
742 static void hci_req_add_le_create_conn(struct hci_request *req,
743 struct hci_conn *conn)
745 struct hci_cp_le_create_conn cp;
746 struct hci_dev *hdev = conn->hdev;
749 memset(&cp, 0, sizeof(cp));
751 /* Update random address, but set require_privacy to false so
752 * that we never connect with an non-resolvable address.
754 if (hci_update_random_address(req, false, &own_addr_type))
757 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
758 cp.scan_window = cpu_to_le16(hdev->le_scan_window);
759 bacpy(&cp.peer_addr, &conn->dst);
760 cp.peer_addr_type = conn->dst_type;
761 cp.own_address_type = own_addr_type;
762 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
763 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
764 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
765 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
766 cp.min_ce_len = cpu_to_le16(0x0000);
767 cp.max_ce_len = cpu_to_le16(0x0000);
769 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
771 conn->state = BT_CONNECT;
772 clear_bit(HCI_CONN_SCANNING, &conn->flags);
775 static void hci_req_directed_advertising(struct hci_request *req,
776 struct hci_conn *conn)
778 struct hci_dev *hdev = req->hdev;
779 struct hci_cp_le_set_adv_param cp;
783 /* Clear the HCI_LE_ADV bit temporarily so that the
784 * hci_update_random_address knows that it's safe to go ahead
785 * and write a new random address. The flag will be set back on
786 * as soon as the SET_ADV_ENABLE HCI command completes.
788 hci_dev_clear_flag(hdev, HCI_LE_ADV);
790 /* Set require_privacy to false so that the remote device has a
791 * chance of identifying us.
793 if (hci_update_random_address(req, false, &own_addr_type) < 0)
796 memset(&cp, 0, sizeof(cp));
797 cp.type = LE_ADV_DIRECT_IND;
798 cp.own_address_type = own_addr_type;
799 cp.direct_addr_type = conn->dst_type;
800 bacpy(&cp.direct_addr, &conn->dst);
801 cp.channel_map = hdev->le_adv_channel_map;
803 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
806 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
808 conn->state = BT_CONNECT;
811 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
812 u8 dst_type, u8 sec_level, u16 conn_timeout,
815 struct hci_conn_params *params;
816 struct hci_conn *conn, *conn_unfinished;
818 struct hci_request req;
821 /* Let's make sure that le is enabled.*/
822 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
823 if (lmp_le_capable(hdev))
824 return ERR_PTR(-ECONNREFUSED);
826 return ERR_PTR(-EOPNOTSUPP);
829 /* Some devices send ATT messages as soon as the physical link is
830 * established. To be able to handle these ATT messages, the user-
831 * space first establishes the connection and then starts the pairing
834 * So if a hci_conn object already exists for the following connection
835 * attempt, we simply update pending_sec_level and auth_type fields
836 * and return the object found.
838 conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
839 conn_unfinished = NULL;
841 if (conn->state == BT_CONNECT &&
842 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
843 BT_DBG("will continue unfinished conn %pMR", dst);
844 conn_unfinished = conn;
846 if (conn->pending_sec_level < sec_level)
847 conn->pending_sec_level = sec_level;
852 /* Since the controller supports only one LE connection attempt at a
853 * time, we return -EBUSY if there is any connection attempt running.
855 if (hci_lookup_le_connect(hdev))
856 return ERR_PTR(-EBUSY);
858 /* When given an identity address with existing identity
859 * resolving key, the connection needs to be established
860 * to a resolvable random address.
862 * Storing the resolvable random address is required here
863 * to handle connection failures. The address will later
864 * be resolved back into the original identity address
865 * from the connect request.
867 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
868 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
870 dst_type = ADDR_LE_DEV_RANDOM;
873 if (conn_unfinished) {
874 conn = conn_unfinished;
875 bacpy(&conn->dst, dst);
877 conn = hci_conn_add(hdev, LE_LINK, dst, role);
881 return ERR_PTR(-ENOMEM);
883 conn->dst_type = dst_type;
884 conn->sec_level = BT_SECURITY_LOW;
885 conn->conn_timeout = conn_timeout;
887 if (!conn_unfinished)
888 conn->pending_sec_level = sec_level;
890 hci_req_init(&req, hdev);
892 /* Disable advertising if we're active. For master role
893 * connections most controllers will refuse to connect if
894 * advertising is enabled, and for slave role connections we
895 * anyway have to disable it in order to start directed
898 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
900 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
904 /* If requested to connect as slave use directed advertising */
905 if (conn->role == HCI_ROLE_SLAVE) {
906 /* If we're active scanning most controllers are unable
907 * to initiate advertising. Simply reject the attempt.
909 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
910 hdev->le_scan_type == LE_SCAN_ACTIVE) {
911 skb_queue_purge(&req.cmd_q);
913 return ERR_PTR(-EBUSY);
916 hci_req_directed_advertising(&req, conn);
920 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
922 conn->le_conn_min_interval = params->conn_min_interval;
923 conn->le_conn_max_interval = params->conn_max_interval;
924 conn->le_conn_latency = params->conn_latency;
925 conn->le_supv_timeout = params->supervision_timeout;
927 conn->le_conn_min_interval = hdev->le_conn_min_interval;
928 conn->le_conn_max_interval = hdev->le_conn_max_interval;
929 conn->le_conn_latency = hdev->le_conn_latency;
930 conn->le_supv_timeout = hdev->le_supv_timeout;
933 /* If controller is scanning, we stop it since some controllers are
934 * not able to scan and connect at the same time. Also set the
935 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
936 * handler for scan disabling knows to set the correct discovery
939 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
940 hci_req_add_le_scan_disable(&req);
941 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
944 hci_req_add_le_create_conn(&req, conn);
947 err = hci_req_run(&req, create_le_conn_complete);
954 /* If this is continuation of connect started by hci_connect_le_scan,
955 * it already called hci_conn_hold and calling it again would mess the
958 if (!conn_unfinished)
964 static void hci_connect_le_scan_complete(struct hci_dev *hdev, u8 status,
967 struct hci_conn *conn;
972 BT_ERR("Failed to add device to auto conn whitelist: status 0x%2.2x",
977 conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
979 hci_le_conn_failed(conn, status);
981 hci_dev_unlock(hdev);
984 static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
986 struct hci_conn *conn;
988 conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, addr);
992 if (conn->dst_type != type)
995 if (conn->state != BT_CONNECTED)
1001 /* This function requires the caller holds hdev->lock */
1002 static int hci_explicit_conn_params_set(struct hci_request *req,
1003 bdaddr_t *addr, u8 addr_type)
1005 struct hci_dev *hdev = req->hdev;
1006 struct hci_conn_params *params;
1008 if (is_connected(hdev, addr, addr_type))
1011 params = hci_conn_params_lookup(hdev, addr, addr_type);
1013 params = hci_conn_params_add(hdev, addr, addr_type);
1017 /* If we created new params, mark them to be deleted in
1018 * hci_connect_le_scan_cleanup. It's different case than
1019 * existing disabled params, those will stay after cleanup.
1021 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1024 /* We're trying to connect, so make sure params are at pend_le_conns */
1025 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1026 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1027 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1028 list_del_init(¶ms->action);
1029 list_add(¶ms->action, &hdev->pend_le_conns);
1032 params->explicit_connect = true;
1033 __hci_update_background_scan(req);
1035 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1036 params->auto_connect);
1041 /* This function requires the caller holds hdev->lock */
1042 struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1043 u8 dst_type, u8 sec_level,
1044 u16 conn_timeout, u8 role)
1046 struct hci_conn *conn;
1047 struct hci_request req;
1050 /* Let's make sure that le is enabled.*/
1051 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1052 if (lmp_le_capable(hdev))
1053 return ERR_PTR(-ECONNREFUSED);
1055 return ERR_PTR(-EOPNOTSUPP);
1058 /* Some devices send ATT messages as soon as the physical link is
1059 * established. To be able to handle these ATT messages, the user-
1060 * space first establishes the connection and then starts the pairing
1063 * So if a hci_conn object already exists for the following connection
1064 * attempt, we simply update pending_sec_level and auth_type fields
1065 * and return the object found.
1067 conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
1069 if (conn->pending_sec_level < sec_level)
1070 conn->pending_sec_level = sec_level;
1074 BT_DBG("requesting refresh of dst_addr");
1076 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1078 return ERR_PTR(-ENOMEM);
1080 hci_req_init(&req, hdev);
1082 if (hci_explicit_conn_params_set(&req, dst, dst_type) < 0)
1083 return ERR_PTR(-EBUSY);
1085 conn->state = BT_CONNECT;
1086 set_bit(HCI_CONN_SCANNING, &conn->flags);
1088 err = hci_req_run(&req, hci_connect_le_scan_complete);
1089 if (err && err != -ENODATA) {
1091 return ERR_PTR(err);
1094 conn->dst_type = dst_type;
1095 conn->sec_level = BT_SECURITY_LOW;
1096 conn->pending_sec_level = sec_level;
1097 conn->conn_timeout = conn_timeout;
1100 hci_conn_hold(conn);
1104 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1105 u8 sec_level, u8 auth_type)
1107 struct hci_conn *acl;
1109 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1110 if (lmp_bredr_capable(hdev))
1111 return ERR_PTR(-ECONNREFUSED);
1113 return ERR_PTR(-EOPNOTSUPP);
1116 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1118 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1120 return ERR_PTR(-ENOMEM);
1125 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1126 acl->sec_level = BT_SECURITY_LOW;
1127 acl->pending_sec_level = sec_level;
1128 acl->auth_type = auth_type;
1129 hci_acl_create_connection(acl);
1135 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1138 struct hci_conn *acl;
1139 struct hci_conn *sco;
1141 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1145 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1147 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1150 return ERR_PTR(-ENOMEM);
1159 sco->setting = setting;
1161 if (acl->state == BT_CONNECTED &&
1162 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1163 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1164 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1166 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1167 /* defer SCO setup until mode change completed */
1168 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1172 hci_sco_setup(acl, 0x00);
1178 /* Check link security requirement */
1179 int hci_conn_check_link_mode(struct hci_conn *conn)
1181 BT_DBG("hcon %p", conn);
1183 /* In Secure Connections Only mode, it is required that Secure
1184 * Connections is used and the link is encrypted with AES-CCM
1185 * using a P-256 authenticated combination key.
1187 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1188 if (!hci_conn_sc_enabled(conn) ||
1189 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1190 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1194 if (hci_conn_ssp_enabled(conn) &&
1195 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1201 /* Authenticate remote device */
1202 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1204 BT_DBG("hcon %p", conn);
1206 if (conn->pending_sec_level > sec_level)
1207 sec_level = conn->pending_sec_level;
1209 if (sec_level > conn->sec_level)
1210 conn->pending_sec_level = sec_level;
1211 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1214 /* Make sure we preserve an existing MITM requirement*/
1215 auth_type |= (conn->auth_type & 0x01);
1217 conn->auth_type = auth_type;
1219 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1220 struct hci_cp_auth_requested cp;
1222 cp.handle = cpu_to_le16(conn->handle);
1223 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1226 /* If we're already encrypted set the REAUTH_PEND flag,
1227 * otherwise set the ENCRYPT_PEND.
1229 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1230 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1232 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1238 /* Encrypt the the link */
1239 static void hci_conn_encrypt(struct hci_conn *conn)
1241 BT_DBG("hcon %p", conn);
1243 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1244 struct hci_cp_set_conn_encrypt cp;
1245 cp.handle = cpu_to_le16(conn->handle);
1247 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1252 /* Enable security */
1253 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1256 BT_DBG("hcon %p", conn);
1258 if (conn->type == LE_LINK)
1259 return smp_conn_security(conn, sec_level);
1261 /* For sdp we don't need the link key. */
1262 if (sec_level == BT_SECURITY_SDP)
1265 /* For non 2.1 devices and low security level we don't need the link
1267 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1270 /* For other security levels we need the link key. */
1271 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1274 /* An authenticated FIPS approved combination key has sufficient
1275 * security for security level 4. */
1276 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1277 sec_level == BT_SECURITY_FIPS)
1280 /* An authenticated combination key has sufficient security for
1281 security level 3. */
1282 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1283 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1284 sec_level == BT_SECURITY_HIGH)
1287 /* An unauthenticated combination key has sufficient security for
1288 security level 1 and 2. */
1289 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1290 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1291 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1294 /* A combination key has always sufficient security for the security
1295 levels 1 or 2. High security level requires the combination key
1296 is generated using maximum PIN code length (16).
1297 For pre 2.1 units. */
1298 if (conn->key_type == HCI_LK_COMBINATION &&
1299 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1300 conn->pin_length == 16))
1304 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1308 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1310 if (!hci_conn_auth(conn, sec_level, auth_type))
1314 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1317 hci_conn_encrypt(conn);
1320 EXPORT_SYMBOL(hci_conn_security);
1322 /* Check secure link requirement */
1323 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1325 BT_DBG("hcon %p", conn);
1327 /* Accept if non-secure or higher security level is required */
1328 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1331 /* Accept if secure or higher security level is already present */
1332 if (conn->sec_level == BT_SECURITY_HIGH ||
1333 conn->sec_level == BT_SECURITY_FIPS)
1336 /* Reject not secure link */
1339 EXPORT_SYMBOL(hci_conn_check_secure);
1342 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1344 BT_DBG("hcon %p", conn);
1346 if (role == conn->role)
1349 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1350 struct hci_cp_switch_role cp;
1351 bacpy(&cp.bdaddr, &conn->dst);
1353 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1358 EXPORT_SYMBOL(hci_conn_switch_role);
1360 /* Enter active mode */
1361 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1363 struct hci_dev *hdev = conn->hdev;
1365 BT_DBG("hcon %p mode %d", conn, conn->mode);
1367 if (conn->mode != HCI_CM_SNIFF)
1370 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1373 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1374 struct hci_cp_exit_sniff_mode cp;
1375 cp.handle = cpu_to_le16(conn->handle);
1376 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1380 if (hdev->idle_timeout > 0)
1381 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1382 msecs_to_jiffies(hdev->idle_timeout));
1385 /* Drop all connection on the device */
1386 void hci_conn_hash_flush(struct hci_dev *hdev)
1388 struct hci_conn_hash *h = &hdev->conn_hash;
1389 struct hci_conn *c, *n;
1391 BT_DBG("hdev %s", hdev->name);
1393 list_for_each_entry_safe(c, n, &h->list, list) {
1394 c->state = BT_CLOSED;
1396 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1401 /* Check pending connect attempts */
1402 void hci_conn_check_pending(struct hci_dev *hdev)
1404 struct hci_conn *conn;
1406 BT_DBG("hdev %s", hdev->name);
1410 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1412 hci_acl_create_connection(conn);
1414 hci_dev_unlock(hdev);
1417 static u32 get_link_mode(struct hci_conn *conn)
1421 if (conn->role == HCI_ROLE_MASTER)
1422 link_mode |= HCI_LM_MASTER;
1424 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1425 link_mode |= HCI_LM_ENCRYPT;
1427 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1428 link_mode |= HCI_LM_AUTH;
1430 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1431 link_mode |= HCI_LM_SECURE;
1433 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1434 link_mode |= HCI_LM_FIPS;
1439 int hci_get_conn_list(void __user *arg)
1442 struct hci_conn_list_req req, *cl;
1443 struct hci_conn_info *ci;
1444 struct hci_dev *hdev;
1445 int n = 0, size, err;
1447 if (copy_from_user(&req, arg, sizeof(req)))
1450 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1453 size = sizeof(req) + req.conn_num * sizeof(*ci);
1455 cl = kmalloc(size, GFP_KERNEL);
1459 hdev = hci_dev_get(req.dev_id);
1468 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1469 bacpy(&(ci + n)->bdaddr, &c->dst);
1470 (ci + n)->handle = c->handle;
1471 (ci + n)->type = c->type;
1472 (ci + n)->out = c->out;
1473 (ci + n)->state = c->state;
1474 (ci + n)->link_mode = get_link_mode(c);
1475 if (++n >= req.conn_num)
1478 hci_dev_unlock(hdev);
1480 cl->dev_id = hdev->id;
1482 size = sizeof(req) + n * sizeof(*ci);
1486 err = copy_to_user(arg, cl, size);
1489 return err ? -EFAULT : 0;
1492 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1494 struct hci_conn_info_req req;
1495 struct hci_conn_info ci;
1496 struct hci_conn *conn;
1497 char __user *ptr = arg + sizeof(req);
1499 if (copy_from_user(&req, arg, sizeof(req)))
1503 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1505 bacpy(&ci.bdaddr, &conn->dst);
1506 ci.handle = conn->handle;
1507 ci.type = conn->type;
1509 ci.state = conn->state;
1510 ci.link_mode = get_link_mode(conn);
1512 hci_dev_unlock(hdev);
1517 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1520 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1522 struct hci_auth_info_req req;
1523 struct hci_conn *conn;
1525 if (copy_from_user(&req, arg, sizeof(req)))
1529 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1531 req.type = conn->auth_type;
1532 hci_dev_unlock(hdev);
1537 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1540 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1542 struct hci_dev *hdev = conn->hdev;
1543 struct hci_chan *chan;
1545 BT_DBG("%s hcon %p", hdev->name, conn);
1547 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1548 BT_DBG("Refusing to create new hci_chan");
1552 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1556 chan->conn = hci_conn_get(conn);
1557 skb_queue_head_init(&chan->data_q);
1558 chan->state = BT_CONNECTED;
1560 list_add_rcu(&chan->list, &conn->chan_list);
1565 void hci_chan_del(struct hci_chan *chan)
1567 struct hci_conn *conn = chan->conn;
1568 struct hci_dev *hdev = conn->hdev;
1570 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1572 list_del_rcu(&chan->list);
1576 /* Prevent new hci_chan's to be created for this hci_conn */
1577 set_bit(HCI_CONN_DROP, &conn->flags);
1581 skb_queue_purge(&chan->data_q);
1585 void hci_chan_list_flush(struct hci_conn *conn)
1587 struct hci_chan *chan, *n;
1589 BT_DBG("hcon %p", conn);
1591 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1595 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1598 struct hci_chan *hchan;
1600 list_for_each_entry(hchan, &hcon->chan_list, list) {
1601 if (hchan->handle == handle)
1608 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1610 struct hci_conn_hash *h = &hdev->conn_hash;
1611 struct hci_conn *hcon;
1612 struct hci_chan *hchan = NULL;
1616 list_for_each_entry_rcu(hcon, &h->list, list) {
1617 hchan = __hci_chan_lookup_handle(hcon, handle);