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>
29 #include <net/bluetooth/bluetooth.h>
30 #include <net/bluetooth/hci_core.h>
40 static const struct sco_param sco_param_cvsd[] = {
41 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a }, /* S3 */
42 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007 }, /* S2 */
43 { EDR_ESCO_MASK | ESCO_EV3, 0x0007 }, /* S1 */
44 { EDR_ESCO_MASK | ESCO_HV3, 0xffff }, /* D1 */
45 { EDR_ESCO_MASK | ESCO_HV1, 0xffff }, /* D0 */
48 static const struct sco_param sco_param_wideband[] = {
49 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d }, /* T2 */
50 { EDR_ESCO_MASK | ESCO_EV3, 0x0008 }, /* T1 */
53 static void hci_le_create_connection_cancel(struct hci_conn *conn)
55 hci_send_cmd(conn->hdev, HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
58 static void hci_acl_create_connection(struct hci_conn *conn)
60 struct hci_dev *hdev = conn->hdev;
61 struct inquiry_entry *ie;
62 struct hci_cp_create_conn cp;
64 BT_DBG("hcon %p", conn);
66 conn->state = BT_CONNECT;
69 conn->link_mode = HCI_LM_MASTER;
73 conn->link_policy = hdev->link_policy;
75 memset(&cp, 0, sizeof(cp));
76 bacpy(&cp.bdaddr, &conn->dst);
77 cp.pscan_rep_mode = 0x02;
79 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
81 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
82 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
83 cp.pscan_mode = ie->data.pscan_mode;
84 cp.clock_offset = ie->data.clock_offset |
88 memcpy(conn->dev_class, ie->data.dev_class, 3);
89 if (ie->data.ssp_mode > 0)
90 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
93 cp.pkt_type = cpu_to_le16(conn->pkt_type);
94 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
95 cp.role_switch = 0x01;
97 cp.role_switch = 0x00;
99 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
102 static void hci_acl_create_connection_cancel(struct hci_conn *conn)
104 struct hci_cp_create_conn_cancel cp;
106 BT_DBG("hcon %p", conn);
108 if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
111 bacpy(&cp.bdaddr, &conn->dst);
112 hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
115 static void hci_reject_sco(struct hci_conn *conn)
117 struct hci_cp_reject_sync_conn_req cp;
119 cp.reason = HCI_ERROR_REMOTE_USER_TERM;
120 bacpy(&cp.bdaddr, &conn->dst);
122 hci_send_cmd(conn->hdev, HCI_OP_REJECT_SYNC_CONN_REQ, sizeof(cp), &cp);
125 void hci_disconnect(struct hci_conn *conn, __u8 reason)
127 struct hci_cp_disconnect cp;
129 BT_DBG("hcon %p", conn);
131 conn->state = BT_DISCONN;
133 cp.handle = cpu_to_le16(conn->handle);
135 hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
138 static void hci_amp_disconn(struct hci_conn *conn, __u8 reason)
140 struct hci_cp_disconn_phy_link cp;
142 BT_DBG("hcon %p", conn);
144 conn->state = BT_DISCONN;
146 cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
148 hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
152 static void hci_add_sco(struct hci_conn *conn, __u16 handle)
154 struct hci_dev *hdev = conn->hdev;
155 struct hci_cp_add_sco cp;
157 BT_DBG("hcon %p", conn);
159 conn->state = BT_CONNECT;
164 cp.handle = cpu_to_le16(handle);
165 cp.pkt_type = cpu_to_le16(conn->pkt_type);
167 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
170 bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
172 struct hci_dev *hdev = conn->hdev;
173 struct hci_cp_setup_sync_conn cp;
174 const struct sco_param *param;
176 BT_DBG("hcon %p", conn);
178 conn->state = BT_CONNECT;
183 cp.handle = cpu_to_le16(handle);
185 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
186 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
187 cp.voice_setting = cpu_to_le16(conn->setting);
189 switch (conn->setting & SCO_AIRMODE_MASK) {
190 case SCO_AIRMODE_TRANSP:
191 if (conn->attempt > ARRAY_SIZE(sco_param_wideband))
193 cp.retrans_effort = 0x02;
194 param = &sco_param_wideband[conn->attempt - 1];
196 case SCO_AIRMODE_CVSD:
197 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
199 cp.retrans_effort = 0x01;
200 param = &sco_param_cvsd[conn->attempt - 1];
206 cp.pkt_type = __cpu_to_le16(param->pkt_type);
207 cp.max_latency = __cpu_to_le16(param->max_latency);
209 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
215 void hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max,
216 u16 latency, u16 to_multiplier)
218 struct hci_cp_le_conn_update cp;
219 struct hci_dev *hdev = conn->hdev;
221 memset(&cp, 0, sizeof(cp));
223 cp.handle = cpu_to_le16(conn->handle);
224 cp.conn_interval_min = cpu_to_le16(min);
225 cp.conn_interval_max = cpu_to_le16(max);
226 cp.conn_latency = cpu_to_le16(latency);
227 cp.supervision_timeout = cpu_to_le16(to_multiplier);
228 cp.min_ce_len = cpu_to_le16(0x0000);
229 cp.max_ce_len = cpu_to_le16(0x0000);
231 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
234 void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
237 struct hci_dev *hdev = conn->hdev;
238 struct hci_cp_le_start_enc cp;
240 BT_DBG("hcon %p", conn);
242 memset(&cp, 0, sizeof(cp));
244 cp.handle = cpu_to_le16(conn->handle);
247 memcpy(cp.ltk, ltk, sizeof(cp.ltk));
249 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
252 /* Device _must_ be locked */
253 void hci_sco_setup(struct hci_conn *conn, __u8 status)
255 struct hci_conn *sco = conn->link;
260 BT_DBG("hcon %p", conn);
263 if (lmp_esco_capable(conn->hdev))
264 hci_setup_sync(sco, conn->handle);
266 hci_add_sco(sco, conn->handle);
268 hci_proto_connect_cfm(sco, status);
273 static void hci_conn_disconnect(struct hci_conn *conn)
275 __u8 reason = hci_proto_disconn_ind(conn);
277 switch (conn->type) {
279 hci_amp_disconn(conn, reason);
282 hci_disconnect(conn, reason);
287 static void hci_conn_timeout(struct work_struct *work)
289 struct hci_conn *conn = container_of(work, struct hci_conn,
292 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
294 if (atomic_read(&conn->refcnt))
297 switch (conn->state) {
301 if (conn->type == ACL_LINK)
302 hci_acl_create_connection_cancel(conn);
303 else if (conn->type == LE_LINK)
304 hci_le_create_connection_cancel(conn);
305 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
306 hci_reject_sco(conn);
311 hci_conn_disconnect(conn);
314 conn->state = BT_CLOSED;
319 /* Enter sniff mode */
320 static void hci_conn_idle(struct work_struct *work)
322 struct hci_conn *conn = container_of(work, struct hci_conn,
324 struct hci_dev *hdev = conn->hdev;
326 BT_DBG("hcon %p mode %d", conn, conn->mode);
328 if (test_bit(HCI_RAW, &hdev->flags))
331 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
334 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
337 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
338 struct hci_cp_sniff_subrate cp;
339 cp.handle = cpu_to_le16(conn->handle);
340 cp.max_latency = cpu_to_le16(0);
341 cp.min_remote_timeout = cpu_to_le16(0);
342 cp.min_local_timeout = cpu_to_le16(0);
343 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
346 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
347 struct hci_cp_sniff_mode cp;
348 cp.handle = cpu_to_le16(conn->handle);
349 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
350 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
351 cp.attempt = cpu_to_le16(4);
352 cp.timeout = cpu_to_le16(1);
353 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
357 static void hci_conn_auto_accept(struct work_struct *work)
359 struct hci_conn *conn = container_of(work, struct hci_conn,
360 auto_accept_work.work);
362 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
366 static void le_conn_timeout(struct work_struct *work)
368 struct hci_conn *conn = container_of(work, struct hci_conn,
369 le_conn_timeout.work);
373 hci_le_create_connection_cancel(conn);
376 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
378 struct hci_conn *conn;
380 BT_DBG("%s dst %pMR", hdev->name, dst);
382 conn = kzalloc(sizeof(struct hci_conn), GFP_KERNEL);
386 bacpy(&conn->dst, dst);
387 bacpy(&conn->src, &hdev->bdaddr);
390 conn->mode = HCI_CM_ACTIVE;
391 conn->state = BT_OPEN;
392 conn->auth_type = HCI_AT_GENERAL_BONDING;
393 conn->io_capability = hdev->io_capability;
394 conn->remote_auth = 0xff;
395 conn->key_type = 0xff;
397 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
398 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
402 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
405 if (lmp_esco_capable(hdev))
406 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
407 (hdev->esco_type & EDR_ESCO_MASK);
409 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
412 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
416 skb_queue_head_init(&conn->data_q);
418 INIT_LIST_HEAD(&conn->chan_list);
420 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
421 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
422 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
423 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
425 atomic_set(&conn->refcnt, 0);
429 hci_conn_hash_add(hdev, conn);
431 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
433 hci_conn_init_sysfs(conn);
438 int hci_conn_del(struct hci_conn *conn)
440 struct hci_dev *hdev = conn->hdev;
442 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
444 cancel_delayed_work_sync(&conn->disc_work);
445 cancel_delayed_work_sync(&conn->auto_accept_work);
446 cancel_delayed_work_sync(&conn->idle_work);
448 if (conn->type == ACL_LINK) {
449 struct hci_conn *sco = conn->link;
454 hdev->acl_cnt += conn->sent;
455 } else if (conn->type == LE_LINK) {
456 cancel_delayed_work_sync(&conn->le_conn_timeout);
459 hdev->le_cnt += conn->sent;
461 hdev->acl_cnt += conn->sent;
463 struct hci_conn *acl = conn->link;
470 hci_chan_list_flush(conn);
473 amp_mgr_put(conn->amp_mgr);
475 hci_conn_hash_del(hdev, conn);
477 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
479 skb_queue_purge(&conn->data_q);
481 hci_conn_del_sysfs(conn);
490 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
492 int use_src = bacmp(src, BDADDR_ANY);
493 struct hci_dev *hdev = NULL, *d;
495 BT_DBG("%pMR -> %pMR", src, dst);
497 read_lock(&hci_dev_list_lock);
499 list_for_each_entry(d, &hci_dev_list, list) {
500 if (!test_bit(HCI_UP, &d->flags) ||
501 test_bit(HCI_RAW, &d->flags) ||
502 test_bit(HCI_USER_CHANNEL, &d->dev_flags) ||
503 d->dev_type != HCI_BREDR)
507 * No source address - find interface with bdaddr != dst
508 * Source address - find interface with bdaddr == src
512 if (!bacmp(&d->bdaddr, src)) {
516 if (bacmp(&d->bdaddr, dst)) {
523 hdev = hci_dev_hold(hdev);
525 read_unlock(&hci_dev_list_lock);
528 EXPORT_SYMBOL(hci_get_route);
530 /* This function requires the caller holds hdev->lock */
531 void hci_le_conn_failed(struct hci_conn *conn, u8 status)
533 struct hci_dev *hdev = conn->hdev;
535 conn->state = BT_CLOSED;
537 mgmt_connect_failed(hdev, &conn->dst, conn->type, conn->dst_type,
540 hci_proto_connect_cfm(conn, status);
544 /* Since we may have temporarily stopped the background scanning in
545 * favor of connection establishment, we should restart it.
547 hci_update_background_scan(hdev);
550 static void create_le_conn_complete(struct hci_dev *hdev, u8 status)
552 struct hci_conn *conn;
557 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
562 conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
566 hci_le_conn_failed(conn, status);
569 hci_dev_unlock(hdev);
572 static void hci_req_add_le_create_conn(struct hci_request *req,
573 struct hci_conn *conn)
575 struct hci_cp_le_create_conn cp;
576 struct hci_dev *hdev = conn->hdev;
579 memset(&cp, 0, sizeof(cp));
581 /* Update random address, but set require_privacy to false so
582 * that we never connect with an unresolvable address.
584 if (hci_update_random_address(req, false, &own_addr_type))
587 /* Save the address type used for this connnection attempt so we able
588 * to retrieve this information if we need it.
590 conn->src_type = own_addr_type;
592 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
593 cp.scan_window = cpu_to_le16(hdev->le_scan_window);
594 bacpy(&cp.peer_addr, &conn->dst);
595 cp.peer_addr_type = conn->dst_type;
596 cp.own_address_type = own_addr_type;
597 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
598 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
599 cp.supervision_timeout = cpu_to_le16(0x002a);
600 cp.min_ce_len = cpu_to_le16(0x0000);
601 cp.max_ce_len = cpu_to_le16(0x0000);
603 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
605 conn->state = BT_CONNECT;
608 struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
609 u8 dst_type, u8 sec_level, u8 auth_type)
611 struct hci_conn_params *params;
612 struct hci_conn *conn;
614 struct hci_request req;
617 if (test_bit(HCI_ADVERTISING, &hdev->flags))
618 return ERR_PTR(-ENOTSUPP);
620 /* Some devices send ATT messages as soon as the physical link is
621 * established. To be able to handle these ATT messages, the user-
622 * space first establishes the connection and then starts the pairing
625 * So if a hci_conn object already exists for the following connection
626 * attempt, we simply update pending_sec_level and auth_type fields
627 * and return the object found.
629 conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst);
631 conn->pending_sec_level = sec_level;
632 conn->auth_type = auth_type;
636 /* Since the controller supports only one LE connection attempt at a
637 * time, we return -EBUSY if there is any connection attempt running.
639 conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT);
641 return ERR_PTR(-EBUSY);
643 /* When given an identity address with existing identity
644 * resolving key, the connection needs to be established
645 * to a resolvable random address.
647 * This uses the cached random resolvable address from
648 * a previous scan. When no cached address is available,
649 * try connecting to the identity address instead.
651 * Storing the resolvable random address is required here
652 * to handle connection failures. The address will later
653 * be resolved back into the original identity address
654 * from the connect request.
656 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
657 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
659 dst_type = ADDR_LE_DEV_RANDOM;
662 conn = hci_conn_add(hdev, LE_LINK, dst);
664 return ERR_PTR(-ENOMEM);
666 conn->dst_type = dst_type;
669 conn->link_mode |= HCI_LM_MASTER;
670 conn->sec_level = BT_SECURITY_LOW;
671 conn->pending_sec_level = sec_level;
672 conn->auth_type = auth_type;
674 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
676 conn->le_conn_min_interval = params->conn_min_interval;
677 conn->le_conn_max_interval = params->conn_max_interval;
679 conn->le_conn_min_interval = hdev->le_conn_min_interval;
680 conn->le_conn_max_interval = hdev->le_conn_max_interval;
683 hci_req_init(&req, hdev);
685 /* If controller is scanning, we stop it since some controllers are
686 * not able to scan and connect at the same time. Also set the
687 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
688 * handler for scan disabling knows to set the correct discovery
691 if (test_bit(HCI_LE_SCAN, &hdev->dev_flags)) {
692 hci_req_add_le_scan_disable(&req);
693 set_bit(HCI_LE_SCAN_INTERRUPTED, &hdev->dev_flags);
696 hci_req_add_le_create_conn(&req, conn);
698 err = hci_req_run(&req, create_le_conn_complete);
709 struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
710 u8 sec_level, u8 auth_type)
712 struct hci_conn *acl;
714 if (!test_bit(HCI_BREDR_ENABLED, &hdev->dev_flags))
715 return ERR_PTR(-ENOTSUPP);
717 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
719 acl = hci_conn_add(hdev, ACL_LINK, dst);
721 return ERR_PTR(-ENOMEM);
726 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
727 acl->sec_level = BT_SECURITY_LOW;
728 acl->pending_sec_level = sec_level;
729 acl->auth_type = auth_type;
730 hci_acl_create_connection(acl);
736 struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
739 struct hci_conn *acl;
740 struct hci_conn *sco;
742 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
746 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
748 sco = hci_conn_add(hdev, type, dst);
751 return ERR_PTR(-ENOMEM);
760 sco->setting = setting;
762 if (acl->state == BT_CONNECTED &&
763 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
764 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
765 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
767 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
768 /* defer SCO setup until mode change completed */
769 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
773 hci_sco_setup(acl, 0x00);
779 /* Check link security requirement */
780 int hci_conn_check_link_mode(struct hci_conn *conn)
782 BT_DBG("hcon %p", conn);
784 /* In Secure Connections Only mode, it is required that Secure
785 * Connections is used and the link is encrypted with AES-CCM
786 * using a P-256 authenticated combination key.
788 if (test_bit(HCI_SC_ONLY, &conn->hdev->flags)) {
789 if (!hci_conn_sc_enabled(conn) ||
790 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
791 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
795 if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
801 /* Authenticate remote device */
802 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
804 BT_DBG("hcon %p", conn);
806 if (conn->pending_sec_level > sec_level)
807 sec_level = conn->pending_sec_level;
809 if (sec_level > conn->sec_level)
810 conn->pending_sec_level = sec_level;
811 else if (conn->link_mode & HCI_LM_AUTH)
814 /* Make sure we preserve an existing MITM requirement*/
815 auth_type |= (conn->auth_type & 0x01);
817 conn->auth_type = auth_type;
819 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
820 struct hci_cp_auth_requested cp;
822 cp.handle = cpu_to_le16(conn->handle);
823 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
826 /* If we're already encrypted set the REAUTH_PEND flag,
827 * otherwise set the ENCRYPT_PEND.
829 if (conn->key_type != 0xff)
830 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
832 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
838 /* Encrypt the the link */
839 static void hci_conn_encrypt(struct hci_conn *conn)
841 BT_DBG("hcon %p", conn);
843 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
844 struct hci_cp_set_conn_encrypt cp;
845 cp.handle = cpu_to_le16(conn->handle);
847 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
852 /* Enable security */
853 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
855 BT_DBG("hcon %p", conn);
857 if (conn->type == LE_LINK)
858 return smp_conn_security(conn, sec_level);
860 /* For sdp we don't need the link key. */
861 if (sec_level == BT_SECURITY_SDP)
864 /* For non 2.1 devices and low security level we don't need the link
866 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
869 /* For other security levels we need the link key. */
870 if (!(conn->link_mode & HCI_LM_AUTH))
873 /* An authenticated FIPS approved combination key has sufficient
874 * security for security level 4. */
875 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
876 sec_level == BT_SECURITY_FIPS)
879 /* An authenticated combination key has sufficient security for
881 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
882 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
883 sec_level == BT_SECURITY_HIGH)
886 /* An unauthenticated combination key has sufficient security for
887 security level 1 and 2. */
888 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
889 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
890 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
893 /* A combination key has always sufficient security for the security
894 levels 1 or 2. High security level requires the combination key
895 is generated using maximum PIN code length (16).
896 For pre 2.1 units. */
897 if (conn->key_type == HCI_LK_COMBINATION &&
898 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
899 conn->pin_length == 16))
903 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
906 if (!hci_conn_auth(conn, sec_level, auth_type))
910 if (conn->link_mode & HCI_LM_ENCRYPT)
913 hci_conn_encrypt(conn);
916 EXPORT_SYMBOL(hci_conn_security);
918 /* Check secure link requirement */
919 int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
921 BT_DBG("hcon %p", conn);
923 /* Accept if non-secure or higher security level is required */
924 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
927 /* Accept if secure or higher security level is already present */
928 if (conn->sec_level == BT_SECURITY_HIGH ||
929 conn->sec_level == BT_SECURITY_FIPS)
932 /* Reject not secure link */
935 EXPORT_SYMBOL(hci_conn_check_secure);
937 /* Change link key */
938 int hci_conn_change_link_key(struct hci_conn *conn)
940 BT_DBG("hcon %p", conn);
942 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
943 struct hci_cp_change_conn_link_key cp;
944 cp.handle = cpu_to_le16(conn->handle);
945 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
953 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
955 BT_DBG("hcon %p", conn);
957 if (!role && conn->link_mode & HCI_LM_MASTER)
960 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
961 struct hci_cp_switch_role cp;
962 bacpy(&cp.bdaddr, &conn->dst);
964 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
969 EXPORT_SYMBOL(hci_conn_switch_role);
971 /* Enter active mode */
972 void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
974 struct hci_dev *hdev = conn->hdev;
976 BT_DBG("hcon %p mode %d", conn, conn->mode);
978 if (test_bit(HCI_RAW, &hdev->flags))
981 if (conn->mode != HCI_CM_SNIFF)
984 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
987 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
988 struct hci_cp_exit_sniff_mode cp;
989 cp.handle = cpu_to_le16(conn->handle);
990 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
994 if (hdev->idle_timeout > 0)
995 queue_delayed_work(hdev->workqueue, &conn->idle_work,
996 msecs_to_jiffies(hdev->idle_timeout));
999 /* Drop all connection on the device */
1000 void hci_conn_hash_flush(struct hci_dev *hdev)
1002 struct hci_conn_hash *h = &hdev->conn_hash;
1003 struct hci_conn *c, *n;
1005 BT_DBG("hdev %s", hdev->name);
1007 list_for_each_entry_safe(c, n, &h->list, list) {
1008 c->state = BT_CLOSED;
1010 hci_proto_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1015 /* Check pending connect attempts */
1016 void hci_conn_check_pending(struct hci_dev *hdev)
1018 struct hci_conn *conn;
1020 BT_DBG("hdev %s", hdev->name);
1024 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1026 hci_acl_create_connection(conn);
1028 hci_dev_unlock(hdev);
1031 int hci_get_conn_list(void __user *arg)
1034 struct hci_conn_list_req req, *cl;
1035 struct hci_conn_info *ci;
1036 struct hci_dev *hdev;
1037 int n = 0, size, err;
1039 if (copy_from_user(&req, arg, sizeof(req)))
1042 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1045 size = sizeof(req) + req.conn_num * sizeof(*ci);
1047 cl = kmalloc(size, GFP_KERNEL);
1051 hdev = hci_dev_get(req.dev_id);
1060 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1061 bacpy(&(ci + n)->bdaddr, &c->dst);
1062 (ci + n)->handle = c->handle;
1063 (ci + n)->type = c->type;
1064 (ci + n)->out = c->out;
1065 (ci + n)->state = c->state;
1066 (ci + n)->link_mode = c->link_mode;
1067 if (++n >= req.conn_num)
1070 hci_dev_unlock(hdev);
1072 cl->dev_id = hdev->id;
1074 size = sizeof(req) + n * sizeof(*ci);
1078 err = copy_to_user(arg, cl, size);
1081 return err ? -EFAULT : 0;
1084 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1086 struct hci_conn_info_req req;
1087 struct hci_conn_info ci;
1088 struct hci_conn *conn;
1089 char __user *ptr = arg + sizeof(req);
1091 if (copy_from_user(&req, arg, sizeof(req)))
1095 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1097 bacpy(&ci.bdaddr, &conn->dst);
1098 ci.handle = conn->handle;
1099 ci.type = conn->type;
1101 ci.state = conn->state;
1102 ci.link_mode = conn->link_mode;
1104 hci_dev_unlock(hdev);
1109 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1112 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1114 struct hci_auth_info_req req;
1115 struct hci_conn *conn;
1117 if (copy_from_user(&req, arg, sizeof(req)))
1121 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1123 req.type = conn->auth_type;
1124 hci_dev_unlock(hdev);
1129 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1132 struct hci_chan *hci_chan_create(struct hci_conn *conn)
1134 struct hci_dev *hdev = conn->hdev;
1135 struct hci_chan *chan;
1137 BT_DBG("%s hcon %p", hdev->name, conn);
1139 chan = kzalloc(sizeof(struct hci_chan), GFP_KERNEL);
1144 skb_queue_head_init(&chan->data_q);
1145 chan->state = BT_CONNECTED;
1147 list_add_rcu(&chan->list, &conn->chan_list);
1152 void hci_chan_del(struct hci_chan *chan)
1154 struct hci_conn *conn = chan->conn;
1155 struct hci_dev *hdev = conn->hdev;
1157 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1159 list_del_rcu(&chan->list);
1163 hci_conn_drop(conn);
1165 skb_queue_purge(&chan->data_q);
1169 void hci_chan_list_flush(struct hci_conn *conn)
1171 struct hci_chan *chan, *n;
1173 BT_DBG("hcon %p", conn);
1175 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1179 static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1182 struct hci_chan *hchan;
1184 list_for_each_entry(hchan, &hcon->chan_list, list) {
1185 if (hchan->handle == handle)
1192 struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1194 struct hci_conn_hash *h = &hdev->conn_hash;
1195 struct hci_conn *hcon;
1196 struct hci_chan *hchan = NULL;
1200 list_for_each_entry_rcu(hcon, &h->list, list) {
1201 hchan = __hci_chan_lookup_handle(hcon, handle);