v4.19.13 snapshot.
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
new file mode 100644
index 0000000..bd4978c
--- /dev/null
+++ b/net/bluetooth/hci_conn.c
@@ -0,0 +1,1706 @@
+/*
+ BlueZ - Bluetooth protocol stack for Linux
+ Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
+
+ Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+/* Bluetooth HCI connection handling. */
+
+#include <linux/export.h>
+#include <linux/debugfs.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/l2cap.h>
+
+#include "hci_request.h"
+#include "smp.h"
+#include "a2mp.h"
+
+struct sco_param {
+ u16 pkt_type;
+ u16 max_latency;
+ u8 retrans_effort;
+};
+
+static const struct sco_param esco_param_cvsd[] = {
+ { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
+ { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
+ { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
+ { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
+ { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
+};
+
+static const struct sco_param sco_param_cvsd[] = {
+ { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
+ { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
+};
+
+static const struct sco_param esco_param_msbc[] = {
+ { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
+ { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
+};
+
+/* This function requires the caller holds hdev->lock */
+static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
+{
+ struct hci_conn_params *params;
+ struct hci_dev *hdev = conn->hdev;
+ struct smp_irk *irk;
+ bdaddr_t *bdaddr;
+ u8 bdaddr_type;
+
+ bdaddr = &conn->dst;
+ bdaddr_type = conn->dst_type;
+
+ /* Check if we need to convert to identity address */
+ irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
+ if (irk) {
+ bdaddr = &irk->bdaddr;
+ bdaddr_type = irk->addr_type;
+ }
+
+ params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
+ bdaddr_type);
+ if (!params || !params->explicit_connect)
+ return;
+
+ /* The connection attempt was doing scan for new RPA, and is
+ * in scan phase. If params are not associated with any other
+ * autoconnect action, remove them completely. If they are, just unmark
+ * them as waiting for connection, by clearing explicit_connect field.
+ */
+ params->explicit_connect = false;
+
+ list_del_init(¶ms->action);
+
+ switch (params->auto_connect) {
+ case HCI_AUTO_CONN_EXPLICIT:
+ hci_conn_params_del(hdev, bdaddr, bdaddr_type);
+ /* return instead of break to avoid duplicate scan update */
+ return;
+ case HCI_AUTO_CONN_DIRECT:
+ case HCI_AUTO_CONN_ALWAYS:
+ list_add(¶ms->action, &hdev->pend_le_conns);
+ break;
+ case HCI_AUTO_CONN_REPORT:
+ list_add(¶ms->action, &hdev->pend_le_reports);
+ break;
+ default:
+ break;
+ }
+
+ hci_update_background_scan(hdev);
+}
+
+static void hci_conn_cleanup(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
+ hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
+
+ hci_chan_list_flush(conn);
+
+ hci_conn_hash_del(hdev, conn);
+
+ if (hdev->notify)
+ hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
+
+ hci_conn_del_sysfs(conn);
+
+ debugfs_remove_recursive(conn->debugfs);
+
+ hci_dev_put(hdev);
+
+ hci_conn_put(conn);
+}
+
+static void le_scan_cleanup(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ le_scan_cleanup);
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_conn *c = NULL;
+
+ BT_DBG("%s hcon %p", hdev->name, conn);
+
+ hci_dev_lock(hdev);
+
+ /* Check that the hci_conn is still around */
+ rcu_read_lock();
+ list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
+ if (c == conn)
+ break;
+ }
+ rcu_read_unlock();
+
+ if (c == conn) {
+ hci_connect_le_scan_cleanup(conn);
+ hci_conn_cleanup(conn);
+ }
+
+ hci_dev_unlock(hdev);
+ hci_dev_put(hdev);
+ hci_conn_put(conn);
+}
+
+static void hci_connect_le_scan_remove(struct hci_conn *conn)
+{
+ BT_DBG("%s hcon %p", conn->hdev->name, conn);
+
+ /* We can't call hci_conn_del/hci_conn_cleanup here since that
+ * could deadlock with another hci_conn_del() call that's holding
+ * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
+ * Instead, grab temporary extra references to the hci_dev and
+ * hci_conn and perform the necessary cleanup in a separate work
+ * callback.
+ */
+
+ hci_dev_hold(conn->hdev);
+ hci_conn_get(conn);
+
+ /* Even though we hold a reference to the hdev, many other
+ * things might get cleaned up meanwhile, including the hdev's
+ * own workqueue, so we can't use that for scheduling.
+ */
+ schedule_work(&conn->le_scan_cleanup);
+}
+
+static void hci_acl_create_connection(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct inquiry_entry *ie;
+ struct hci_cp_create_conn cp;
+
+ BT_DBG("hcon %p", conn);
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+ conn->role = HCI_ROLE_MASTER;
+
+ conn->attempt++;
+
+ conn->link_policy = hdev->link_policy;
+
+ memset(&cp, 0, sizeof(cp));
+ bacpy(&cp.bdaddr, &conn->dst);
+ cp.pscan_rep_mode = 0x02;
+
+ ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
+ if (ie) {
+ if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
+ cp.pscan_rep_mode = ie->data.pscan_rep_mode;
+ cp.pscan_mode = ie->data.pscan_mode;
+ cp.clock_offset = ie->data.clock_offset |
+ cpu_to_le16(0x8000);
+ }
+
+ memcpy(conn->dev_class, ie->data.dev_class, 3);
+ if (ie->data.ssp_mode > 0)
+ set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
+ }
+
+ cp.pkt_type = cpu_to_le16(conn->pkt_type);
+ if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
+ cp.role_switch = 0x01;
+ else
+ cp.role_switch = 0x00;
+
+ hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
+}
+
+int hci_disconnect(struct hci_conn *conn, __u8 reason)
+{
+ BT_DBG("hcon %p", conn);
+
+ /* When we are master of an established connection and it enters
+ * the disconnect timeout, then go ahead and try to read the
+ * current clock offset. Processing of the result is done
+ * within the event handling and hci_clock_offset_evt function.
+ */
+ if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
+ (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_read_clock_offset clkoff_cp;
+
+ clkoff_cp.handle = cpu_to_le16(conn->handle);
+ hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
+ &clkoff_cp);
+ }
+
+ return hci_abort_conn(conn, reason);
+}
+
+static void hci_add_sco(struct hci_conn *conn, __u16 handle)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_add_sco cp;
+
+ BT_DBG("hcon %p", conn);
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+
+ conn->attempt++;
+
+ cp.handle = cpu_to_le16(handle);
+ cp.pkt_type = cpu_to_le16(conn->pkt_type);
+
+ hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
+}
+
+bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_setup_sync_conn cp;
+ const struct sco_param *param;
+
+ BT_DBG("hcon %p", conn);
+
+ conn->state = BT_CONNECT;
+ conn->out = true;
+
+ conn->attempt++;
+
+ cp.handle = cpu_to_le16(handle);
+
+ cp.tx_bandwidth = cpu_to_le32(0x00001f40);
+ cp.rx_bandwidth = cpu_to_le32(0x00001f40);
+ cp.voice_setting = cpu_to_le16(conn->setting);
+
+ switch (conn->setting & SCO_AIRMODE_MASK) {
+ case SCO_AIRMODE_TRANSP:
+ if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
+ return false;
+ param = &esco_param_msbc[conn->attempt - 1];
+ break;
+ case SCO_AIRMODE_CVSD:
+ if (lmp_esco_capable(conn->link)) {
+ if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
+ return false;
+ param = &esco_param_cvsd[conn->attempt - 1];
+ } else {
+ if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
+ return false;
+ param = &sco_param_cvsd[conn->attempt - 1];
+ }
+ break;
+ default:
+ return false;
+ }
+
+ cp.retrans_effort = param->retrans_effort;
+ cp.pkt_type = __cpu_to_le16(param->pkt_type);
+ cp.max_latency = __cpu_to_le16(param->max_latency);
+
+ if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
+ return false;
+
+ return true;
+}
+
+u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
+ u16 to_multiplier)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_conn_params *params;
+ struct hci_cp_le_conn_update cp;
+
+ hci_dev_lock(hdev);
+
+ params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
+ if (params) {
+ params->conn_min_interval = min;
+ params->conn_max_interval = max;
+ params->conn_latency = latency;
+ params->supervision_timeout = to_multiplier;
+ }
+
+ hci_dev_unlock(hdev);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.conn_interval_min = cpu_to_le16(min);
+ cp.conn_interval_max = cpu_to_le16(max);
+ cp.conn_latency = cpu_to_le16(latency);
+ cp.supervision_timeout = cpu_to_le16(to_multiplier);
+ cp.min_ce_len = cpu_to_le16(0x0000);
+ cp.max_ce_len = cpu_to_le16(0x0000);
+
+ hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
+
+ if (params)
+ return 0x01;
+
+ return 0x00;
+}
+
+void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
+ __u8 ltk[16], __u8 key_size)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_cp_le_start_enc cp;
+
+ BT_DBG("hcon %p", conn);
+
+ memset(&cp, 0, sizeof(cp));
+
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.rand = rand;
+ cp.ediv = ediv;
+ memcpy(cp.ltk, ltk, key_size);
+
+ hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
+}
+
+/* Device _must_ be locked */
+void hci_sco_setup(struct hci_conn *conn, __u8 status)
+{
+ struct hci_conn *sco = conn->link;
+
+ if (!sco)
+ return;
+
+ BT_DBG("hcon %p", conn);
+
+ if (!status) {
+ if (lmp_esco_capable(conn->hdev))
+ hci_setup_sync(sco, conn->handle);
+ else
+ hci_add_sco(sco, conn->handle);
+ } else {
+ hci_connect_cfm(sco, status);
+ hci_conn_del(sco);
+ }
+}
+
+static void hci_conn_timeout(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ disc_work.work);
+ int refcnt = atomic_read(&conn->refcnt);
+
+ BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
+
+ WARN_ON(refcnt < 0);
+
+ /* FIXME: It was observed that in pairing failed scenario, refcnt
+ * drops below 0. Probably this is because l2cap_conn_del calls
+ * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
+ * dropped. After that loop hci_chan_del is called which also drops
+ * conn. For now make sure that ACL is alive if refcnt is higher then 0,
+ * otherwise drop it.
+ */
+ if (refcnt > 0)
+ return;
+
+ /* LE connections in scanning state need special handling */
+ if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
+ test_bit(HCI_CONN_SCANNING, &conn->flags)) {
+ hci_connect_le_scan_remove(conn);
+ return;
+ }
+
+ hci_abort_conn(conn, hci_proto_disconn_ind(conn));
+}
+
+/* Enter sniff mode */
+static void hci_conn_idle(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ idle_work.work);
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("hcon %p mode %d", conn, conn->mode);
+
+ if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
+ return;
+
+ if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
+ return;
+
+ if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
+ struct hci_cp_sniff_subrate cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.max_latency = cpu_to_le16(0);
+ cp.min_remote_timeout = cpu_to_le16(0);
+ cp.min_local_timeout = cpu_to_le16(0);
+ hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
+ }
+
+ if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
+ struct hci_cp_sniff_mode cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
+ cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
+ cp.attempt = cpu_to_le16(4);
+ cp.timeout = cpu_to_le16(1);
+ hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
+ }
+}
+
+static void hci_conn_auto_accept(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ auto_accept_work.work);
+
+ hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
+ &conn->dst);
+}
+
+static void le_conn_timeout(struct work_struct *work)
+{
+ struct hci_conn *conn = container_of(work, struct hci_conn,
+ le_conn_timeout.work);
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("");
+
+ /* We could end up here due to having done directed advertising,
+ * so clean up the state if necessary. This should however only
+ * happen with broken hardware or if low duty cycle was used
+ * (which doesn't have a timeout of its own).
+ */
+ if (conn->role == HCI_ROLE_SLAVE) {
+ u8 enable = 0x00;
+ hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
+ &enable);
+ hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
+ return;
+ }
+
+ hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
+}
+
+struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
+ u8 role)
+{
+ struct hci_conn *conn;
+
+ BT_DBG("%s dst %pMR", hdev->name, dst);
+
+ conn = kzalloc(sizeof(*conn), GFP_KERNEL);
+ if (!conn)
+ return NULL;
+
+ bacpy(&conn->dst, dst);
+ bacpy(&conn->src, &hdev->bdaddr);
+ conn->hdev = hdev;
+ conn->type = type;
+ conn->role = role;
+ conn->mode = HCI_CM_ACTIVE;
+ conn->state = BT_OPEN;
+ conn->auth_type = HCI_AT_GENERAL_BONDING;
+ conn->io_capability = hdev->io_capability;
+ conn->remote_auth = 0xff;
+ conn->key_type = 0xff;
+ conn->rssi = HCI_RSSI_INVALID;
+ conn->tx_power = HCI_TX_POWER_INVALID;
+ conn->max_tx_power = HCI_TX_POWER_INVALID;
+
+ set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
+ conn->disc_timeout = HCI_DISCONN_TIMEOUT;
+
+ if (conn->role == HCI_ROLE_MASTER)
+ conn->out = true;
+
+ switch (type) {
+ case ACL_LINK:
+ conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
+ break;
+ case LE_LINK:
+ /* conn->src should reflect the local identity address */
+ hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
+ break;
+ case SCO_LINK:
+ if (lmp_esco_capable(hdev))
+ conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
+ (hdev->esco_type & EDR_ESCO_MASK);
+ else
+ conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
+ break;
+ case ESCO_LINK:
+ conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
+ break;
+ }
+
+ skb_queue_head_init(&conn->data_q);
+
+ INIT_LIST_HEAD(&conn->chan_list);
+
+ INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
+ INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
+ INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
+ INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
+ INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
+
+ atomic_set(&conn->refcnt, 0);
+
+ hci_dev_hold(hdev);
+
+ hci_conn_hash_add(hdev, conn);
+ if (hdev->notify)
+ hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
+
+ hci_conn_init_sysfs(conn);
+
+ return conn;
+}
+
+int hci_conn_del(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
+
+ cancel_delayed_work_sync(&conn->disc_work);
+ cancel_delayed_work_sync(&conn->auto_accept_work);
+ cancel_delayed_work_sync(&conn->idle_work);
+
+ if (conn->type == ACL_LINK) {
+ struct hci_conn *sco = conn->link;
+ if (sco)
+ sco->link = NULL;
+
+ /* Unacked frames */
+ hdev->acl_cnt += conn->sent;
+ } else if (conn->type == LE_LINK) {
+ cancel_delayed_work(&conn->le_conn_timeout);
+
+ if (hdev->le_pkts)
+ hdev->le_cnt += conn->sent;
+ else
+ hdev->acl_cnt += conn->sent;
+ } else {
+ struct hci_conn *acl = conn->link;
+ if (acl) {
+ acl->link = NULL;
+ hci_conn_drop(acl);
+ }
+ }
+
+ if (conn->amp_mgr)
+ amp_mgr_put(conn->amp_mgr);
+
+ skb_queue_purge(&conn->data_q);
+
+ /* Remove the connection from the list and cleanup its remaining
+ * state. This is a separate function since for some cases like
+ * BT_CONNECT_SCAN we *only* want the cleanup part without the
+ * rest of hci_conn_del.
+ */
+ hci_conn_cleanup(conn);
+
+ return 0;
+}
+
+struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
+{
+ int use_src = bacmp(src, BDADDR_ANY);
+ struct hci_dev *hdev = NULL, *d;
+
+ BT_DBG("%pMR -> %pMR", src, dst);
+
+ read_lock(&hci_dev_list_lock);
+
+ list_for_each_entry(d, &hci_dev_list, list) {
+ if (!test_bit(HCI_UP, &d->flags) ||
+ hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
+ d->dev_type != HCI_PRIMARY)
+ continue;
+
+ /* Simple routing:
+ * No source address - find interface with bdaddr != dst
+ * Source address - find interface with bdaddr == src
+ */
+
+ if (use_src) {
+ bdaddr_t id_addr;
+ u8 id_addr_type;
+
+ if (src_type == BDADDR_BREDR) {
+ if (!lmp_bredr_capable(d))
+ continue;
+ bacpy(&id_addr, &d->bdaddr);
+ id_addr_type = BDADDR_BREDR;
+ } else {
+ if (!lmp_le_capable(d))
+ continue;
+
+ hci_copy_identity_address(d, &id_addr,
+ &id_addr_type);
+
+ /* Convert from HCI to three-value type */
+ if (id_addr_type == ADDR_LE_DEV_PUBLIC)
+ id_addr_type = BDADDR_LE_PUBLIC;
+ else
+ id_addr_type = BDADDR_LE_RANDOM;
+ }
+
+ if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
+ hdev = d; break;
+ }
+ } else {
+ if (bacmp(&d->bdaddr, dst)) {
+ hdev = d; break;
+ }
+ }
+ }
+
+ if (hdev)
+ hdev = hci_dev_hold(hdev);
+
+ read_unlock(&hci_dev_list_lock);
+ return hdev;
+}
+EXPORT_SYMBOL(hci_get_route);
+
+/* This function requires the caller holds hdev->lock */
+void hci_le_conn_failed(struct hci_conn *conn, u8 status)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_conn_params *params;
+
+ params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
+ conn->dst_type);
+ if (params && params->conn) {
+ hci_conn_drop(params->conn);
+ hci_conn_put(params->conn);
+ params->conn = NULL;
+ }
+
+ conn->state = BT_CLOSED;
+
+ /* If the status indicates successful cancellation of
+ * the attempt (i.e. Unkown Connection Id) there's no point of
+ * notifying failure since we'll go back to keep trying to
+ * connect. The only exception is explicit connect requests
+ * where a timeout + cancel does indicate an actual failure.
+ */
+ if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
+ (params && params->explicit_connect))
+ mgmt_connect_failed(hdev, &conn->dst, conn->type,
+ conn->dst_type, status);
+
+ hci_connect_cfm(conn, status);
+
+ hci_conn_del(conn);
+
+ /* Since we may have temporarily stopped the background scanning in
+ * favor of connection establishment, we should restart it.
+ */
+ hci_update_background_scan(hdev);
+
+ /* Re-enable advertising in case this was a failed connection
+ * attempt as a peripheral.
+ */
+ hci_req_reenable_advertising(hdev);
+}
+
+static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
+{
+ struct hci_conn *conn;
+
+ hci_dev_lock(hdev);
+
+ conn = hci_lookup_le_connect(hdev);
+
+ if (!status) {
+ hci_connect_le_scan_cleanup(conn);
+ goto done;
+ }
+
+ bt_dev_err(hdev, "request failed to create LE connection: "
+ "status 0x%2.2x", status);
+
+ if (!conn)
+ goto done;
+
+ hci_le_conn_failed(conn, status);
+
+done:
+ hci_dev_unlock(hdev);
+}
+
+static bool conn_use_rpa(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ return hci_dev_test_flag(hdev, HCI_PRIVACY);
+}
+
+static void set_ext_conn_params(struct hci_conn *conn,
+ struct hci_cp_le_ext_conn_param *p)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ memset(p, 0, sizeof(*p));
+
+ /* Set window to be the same value as the interval to
+ * enable continuous scanning.
+ */
+ p->scan_interval = cpu_to_le16(hdev->le_scan_interval);
+ p->scan_window = p->scan_interval;
+ p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
+ p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
+ p->conn_latency = cpu_to_le16(conn->le_conn_latency);
+ p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
+ p->min_ce_len = cpu_to_le16(0x0000);
+ p->max_ce_len = cpu_to_le16(0x0000);
+}
+
+static void hci_req_add_le_create_conn(struct hci_request *req,
+ struct hci_conn *conn,
+ bdaddr_t *direct_rpa)
+{
+ struct hci_dev *hdev = conn->hdev;
+ u8 own_addr_type;
+
+ /* If direct address was provided we use it instead of current
+ * address.
+ */
+ if (direct_rpa) {
+ if (bacmp(&req->hdev->random_addr, direct_rpa))
+ hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
+ direct_rpa);
+
+ /* direct address is always RPA */
+ own_addr_type = ADDR_LE_DEV_RANDOM;
+ } else {
+ /* Update random address, but set require_privacy to false so
+ * that we never connect with an non-resolvable address.
+ */
+ if (hci_update_random_address(req, false, conn_use_rpa(conn),
+ &own_addr_type))
+ return;
+ }
+
+ if (use_ext_conn(hdev)) {
+ struct hci_cp_le_ext_create_conn *cp;
+ struct hci_cp_le_ext_conn_param *p;
+ u8 data[sizeof(*cp) + sizeof(*p) * 3];
+ u32 plen;
+
+ cp = (void *) data;
+ p = (void *) cp->data;
+
+ memset(cp, 0, sizeof(*cp));
+
+ bacpy(&cp->peer_addr, &conn->dst);
+ cp->peer_addr_type = conn->dst_type;
+ cp->own_addr_type = own_addr_type;
+
+ plen = sizeof(*cp);
+
+ if (scan_1m(hdev)) {
+ cp->phys |= LE_SCAN_PHY_1M;
+ set_ext_conn_params(conn, p);
+
+ p++;
+ plen += sizeof(*p);
+ }
+
+ if (scan_2m(hdev)) {
+ cp->phys |= LE_SCAN_PHY_2M;
+ set_ext_conn_params(conn, p);
+
+ p++;
+ plen += sizeof(*p);
+ }
+
+ if (scan_coded(hdev)) {
+ cp->phys |= LE_SCAN_PHY_CODED;
+ set_ext_conn_params(conn, p);
+
+ plen += sizeof(*p);
+ }
+
+ hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
+
+ } else {
+ struct hci_cp_le_create_conn cp;
+
+ memset(&cp, 0, sizeof(cp));
+
+ /* Set window to be the same value as the interval to enable
+ * continuous scanning.
+ */
+ cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
+ cp.scan_window = cp.scan_interval;
+
+ bacpy(&cp.peer_addr, &conn->dst);
+ cp.peer_addr_type = conn->dst_type;
+ cp.own_address_type = own_addr_type;
+ cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
+ cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
+ cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
+ cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
+ cp.min_ce_len = cpu_to_le16(0x0000);
+ cp.max_ce_len = cpu_to_le16(0x0000);
+
+ hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
+ }
+
+ conn->state = BT_CONNECT;
+ clear_bit(HCI_CONN_SCANNING, &conn->flags);
+}
+
+static void hci_req_directed_advertising(struct hci_request *req,
+ struct hci_conn *conn)
+{
+ struct hci_dev *hdev = req->hdev;
+ u8 own_addr_type;
+ u8 enable;
+
+ if (ext_adv_capable(hdev)) {
+ struct hci_cp_le_set_ext_adv_params cp;
+ bdaddr_t random_addr;
+
+ /* Set require_privacy to false so that the remote device has a
+ * chance of identifying us.
+ */
+ if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
+ &own_addr_type, &random_addr) < 0)
+ return;
+
+ memset(&cp, 0, sizeof(cp));
+
+ cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
+ cp.own_addr_type = own_addr_type;
+ cp.channel_map = hdev->le_adv_channel_map;
+ cp.tx_power = HCI_TX_POWER_INVALID;
+ cp.primary_phy = HCI_ADV_PHY_1M;
+ cp.secondary_phy = HCI_ADV_PHY_1M;
+ cp.handle = 0; /* Use instance 0 for directed adv */
+ cp.own_addr_type = own_addr_type;
+ cp.peer_addr_type = conn->dst_type;
+ bacpy(&cp.peer_addr, &conn->dst);
+
+ hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
+
+ if (own_addr_type == ADDR_LE_DEV_RANDOM &&
+ bacmp(&random_addr, BDADDR_ANY) &&
+ bacmp(&random_addr, &hdev->random_addr)) {
+ struct hci_cp_le_set_adv_set_rand_addr cp;
+
+ memset(&cp, 0, sizeof(cp));
+
+ cp.handle = 0;
+ bacpy(&cp.bdaddr, &random_addr);
+
+ hci_req_add(req,
+ HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
+ sizeof(cp), &cp);
+ }
+
+ __hci_req_enable_ext_advertising(req);
+ } else {
+ struct hci_cp_le_set_adv_param cp;
+
+ /* Clear the HCI_LE_ADV bit temporarily so that the
+ * hci_update_random_address knows that it's safe to go ahead
+ * and write a new random address. The flag will be set back on
+ * as soon as the SET_ADV_ENABLE HCI command completes.
+ */
+ hci_dev_clear_flag(hdev, HCI_LE_ADV);
+
+ /* Set require_privacy to false so that the remote device has a
+ * chance of identifying us.
+ */
+ if (hci_update_random_address(req, false, conn_use_rpa(conn),
+ &own_addr_type) < 0)
+ return;
+
+ memset(&cp, 0, sizeof(cp));
+ cp.type = LE_ADV_DIRECT_IND;
+ cp.own_address_type = own_addr_type;
+ cp.direct_addr_type = conn->dst_type;
+ bacpy(&cp.direct_addr, &conn->dst);
+ cp.channel_map = hdev->le_adv_channel_map;
+
+ hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
+
+ enable = 0x01;
+ hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
+ &enable);
+ }
+
+ conn->state = BT_CONNECT;
+}
+
+struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
+ u8 dst_type, u8 sec_level, u16 conn_timeout,
+ u8 role, bdaddr_t *direct_rpa)
+{
+ struct hci_conn_params *params;
+ struct hci_conn *conn;
+ struct smp_irk *irk;
+ struct hci_request req;
+ int err;
+
+ /* Let's make sure that le is enabled.*/
+ if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
+ if (lmp_le_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ /* Since the controller supports only one LE connection attempt at a
+ * time, we return -EBUSY if there is any connection attempt running.
+ */
+ if (hci_lookup_le_connect(hdev))
+ return ERR_PTR(-EBUSY);
+
+ /* If there's already a connection object but it's not in
+ * scanning state it means it must already be established, in
+ * which case we can't do anything else except report a failure
+ * to connect.
+ */
+ conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
+ if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
+ return ERR_PTR(-EBUSY);
+ }
+
+ /* When given an identity address with existing identity
+ * resolving key, the connection needs to be established
+ * to a resolvable random address.
+ *
+ * Storing the resolvable random address is required here
+ * to handle connection failures. The address will later
+ * be resolved back into the original identity address
+ * from the connect request.
+ */
+ irk = hci_find_irk_by_addr(hdev, dst, dst_type);
+ if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
+ dst = &irk->rpa;
+ dst_type = ADDR_LE_DEV_RANDOM;
+ }
+
+ if (conn) {
+ bacpy(&conn->dst, dst);
+ } else {
+ conn = hci_conn_add(hdev, LE_LINK, dst, role);
+ if (!conn)
+ return ERR_PTR(-ENOMEM);
+ hci_conn_hold(conn);
+ conn->pending_sec_level = sec_level;
+ }
+
+ conn->dst_type = dst_type;
+ conn->sec_level = BT_SECURITY_LOW;
+ conn->conn_timeout = conn_timeout;
+
+ hci_req_init(&req, hdev);
+
+ /* Disable advertising if we're active. For master role
+ * connections most controllers will refuse to connect if
+ * advertising is enabled, and for slave role connections we
+ * anyway have to disable it in order to start directed
+ * advertising.
+ */
+ if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
+ u8 enable = 0x00;
+ hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
+ &enable);
+ }
+
+ /* If requested to connect as slave use directed advertising */
+ if (conn->role == HCI_ROLE_SLAVE) {
+ /* If we're active scanning most controllers are unable
+ * to initiate advertising. Simply reject the attempt.
+ */
+ if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
+ hdev->le_scan_type == LE_SCAN_ACTIVE) {
+ hci_req_purge(&req);
+ hci_conn_del(conn);
+ return ERR_PTR(-EBUSY);
+ }
+
+ hci_req_directed_advertising(&req, conn);
+ goto create_conn;
+ }
+
+ params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
+ if (params) {
+ conn->le_conn_min_interval = params->conn_min_interval;
+ conn->le_conn_max_interval = params->conn_max_interval;
+ conn->le_conn_latency = params->conn_latency;
+ conn->le_supv_timeout = params->supervision_timeout;
+ } else {
+ conn->le_conn_min_interval = hdev->le_conn_min_interval;
+ conn->le_conn_max_interval = hdev->le_conn_max_interval;
+ conn->le_conn_latency = hdev->le_conn_latency;
+ conn->le_supv_timeout = hdev->le_supv_timeout;
+ }
+
+ /* If controller is scanning, we stop it since some controllers are
+ * not able to scan and connect at the same time. Also set the
+ * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
+ * handler for scan disabling knows to set the correct discovery
+ * state.
+ */
+ if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
+ hci_req_add_le_scan_disable(&req);
+ hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
+ }
+
+ hci_req_add_le_create_conn(&req, conn, direct_rpa);
+
+create_conn:
+ err = hci_req_run(&req, create_le_conn_complete);
+ if (err) {
+ hci_conn_del(conn);
+ return ERR_PTR(err);
+ }
+
+ return conn;
+}
+
+static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
+{
+ struct hci_conn *conn;
+
+ conn = hci_conn_hash_lookup_le(hdev, addr, type);
+ if (!conn)
+ return false;
+
+ if (conn->state != BT_CONNECTED)
+ return false;
+
+ return true;
+}
+
+/* This function requires the caller holds hdev->lock */
+static int hci_explicit_conn_params_set(struct hci_dev *hdev,
+ bdaddr_t *addr, u8 addr_type)
+{
+ struct hci_conn_params *params;
+
+ if (is_connected(hdev, addr, addr_type))
+ return -EISCONN;
+
+ params = hci_conn_params_lookup(hdev, addr, addr_type);
+ if (!params) {
+ params = hci_conn_params_add(hdev, addr, addr_type);
+ if (!params)
+ return -ENOMEM;
+
+ /* If we created new params, mark them to be deleted in
+ * hci_connect_le_scan_cleanup. It's different case than
+ * existing disabled params, those will stay after cleanup.
+ */
+ params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
+ }
+
+ /* We're trying to connect, so make sure params are at pend_le_conns */
+ if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
+ params->auto_connect == HCI_AUTO_CONN_REPORT ||
+ params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
+ list_del_init(¶ms->action);
+ list_add(¶ms->action, &hdev->pend_le_conns);
+ }
+
+ params->explicit_connect = true;
+
+ BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
+ params->auto_connect);
+
+ return 0;
+}
+
+/* This function requires the caller holds hdev->lock */
+struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
+ u8 dst_type, u8 sec_level,
+ u16 conn_timeout)
+{
+ struct hci_conn *conn;
+
+ /* Let's make sure that le is enabled.*/
+ if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
+ if (lmp_le_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ /* Some devices send ATT messages as soon as the physical link is
+ * established. To be able to handle these ATT messages, the user-
+ * space first establishes the connection and then starts the pairing
+ * process.
+ *
+ * So if a hci_conn object already exists for the following connection
+ * attempt, we simply update pending_sec_level and auth_type fields
+ * and return the object found.
+ */
+ conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
+ if (conn) {
+ if (conn->pending_sec_level < sec_level)
+ conn->pending_sec_level = sec_level;
+ goto done;
+ }
+
+ BT_DBG("requesting refresh of dst_addr");
+
+ conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
+ if (!conn)
+ return ERR_PTR(-ENOMEM);
+
+ if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
+ return ERR_PTR(-EBUSY);
+
+ conn->state = BT_CONNECT;
+ set_bit(HCI_CONN_SCANNING, &conn->flags);
+ conn->dst_type = dst_type;
+ conn->sec_level = BT_SECURITY_LOW;
+ conn->pending_sec_level = sec_level;
+ conn->conn_timeout = conn_timeout;
+
+ hci_update_background_scan(hdev);
+
+done:
+ hci_conn_hold(conn);
+ return conn;
+}
+
+struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
+ u8 sec_level, u8 auth_type)
+{
+ struct hci_conn *acl;
+
+ if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
+ if (lmp_bredr_capable(hdev))
+ return ERR_PTR(-ECONNREFUSED);
+
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+
+ acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
+ if (!acl) {
+ acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ }
+
+ hci_conn_hold(acl);
+
+ if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
+ acl->sec_level = BT_SECURITY_LOW;
+ acl->pending_sec_level = sec_level;
+ acl->auth_type = auth_type;
+ hci_acl_create_connection(acl);
+ }
+
+ return acl;
+}
+
+struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
+ __u16 setting)
+{
+ struct hci_conn *acl;
+ struct hci_conn *sco;
+
+ acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
+ if (IS_ERR(acl))
+ return acl;
+
+ sco = hci_conn_hash_lookup_ba(hdev, type, dst);
+ if (!sco) {
+ sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
+ if (!sco) {
+ hci_conn_drop(acl);
+ return ERR_PTR(-ENOMEM);
+ }
+ }
+
+ acl->link = sco;
+ sco->link = acl;
+
+ hci_conn_hold(sco);
+
+ sco->setting = setting;
+
+ if (acl->state == BT_CONNECTED &&
+ (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
+ set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
+ hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
+
+ if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
+ /* defer SCO setup until mode change completed */
+ set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
+ return sco;
+ }
+
+ hci_sco_setup(acl, 0x00);
+ }
+
+ return sco;
+}
+
+/* Check link security requirement */
+int hci_conn_check_link_mode(struct hci_conn *conn)
+{
+ BT_DBG("hcon %p", conn);
+
+ /* In Secure Connections Only mode, it is required that Secure
+ * Connections is used and the link is encrypted with AES-CCM
+ * using a P-256 authenticated combination key.
+ */
+ if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
+ if (!hci_conn_sc_enabled(conn) ||
+ !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
+ conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
+ return 0;
+ }
+
+ if (hci_conn_ssp_enabled(conn) &&
+ !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ return 0;
+
+ return 1;
+}
+
+/* Authenticate remote device */
+static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (conn->pending_sec_level > sec_level)
+ sec_level = conn->pending_sec_level;
+
+ if (sec_level > conn->sec_level)
+ conn->pending_sec_level = sec_level;
+ else if (test_bit(HCI_CONN_AUTH, &conn->flags))
+ return 1;
+
+ /* Make sure we preserve an existing MITM requirement*/
+ auth_type |= (conn->auth_type & 0x01);
+
+ conn->auth_type = auth_type;
+
+ if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
+ struct hci_cp_auth_requested cp;
+
+ cp.handle = cpu_to_le16(conn->handle);
+ hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
+ sizeof(cp), &cp);
+
+ /* If we're already encrypted set the REAUTH_PEND flag,
+ * otherwise set the ENCRYPT_PEND.
+ */
+ if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
+ else
+ set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
+ }
+
+ return 0;
+}
+
+/* Encrypt the the link */
+static void hci_conn_encrypt(struct hci_conn *conn)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
+ struct hci_cp_set_conn_encrypt cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ cp.encrypt = 0x01;
+ hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
+ &cp);
+ }
+}
+
+/* Enable security */
+int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
+ bool initiator)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (conn->type == LE_LINK)
+ return smp_conn_security(conn, sec_level);
+
+ /* For sdp we don't need the link key. */
+ if (sec_level == BT_SECURITY_SDP)
+ return 1;
+
+ /* For non 2.1 devices and low security level we don't need the link
+ key. */
+ if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
+ return 1;
+
+ /* For other security levels we need the link key. */
+ if (!test_bit(HCI_CONN_AUTH, &conn->flags))
+ goto auth;
+
+ /* An authenticated FIPS approved combination key has sufficient
+ * security for security level 4. */
+ if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
+ sec_level == BT_SECURITY_FIPS)
+ goto encrypt;
+
+ /* An authenticated combination key has sufficient security for
+ security level 3. */
+ if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
+ conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
+ sec_level == BT_SECURITY_HIGH)
+ goto encrypt;
+
+ /* An unauthenticated combination key has sufficient security for
+ security level 1 and 2. */
+ if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
+ conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
+ (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
+ goto encrypt;
+
+ /* A combination key has always sufficient security for the security
+ levels 1 or 2. High security level requires the combination key
+ is generated using maximum PIN code length (16).
+ For pre 2.1 units. */
+ if (conn->key_type == HCI_LK_COMBINATION &&
+ (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
+ conn->pin_length == 16))
+ goto encrypt;
+
+auth:
+ if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
+ return 0;
+
+ if (initiator)
+ set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
+
+ if (!hci_conn_auth(conn, sec_level, auth_type))
+ return 0;
+
+encrypt:
+ if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ return 1;
+
+ hci_conn_encrypt(conn);
+ return 0;
+}
+EXPORT_SYMBOL(hci_conn_security);
+
+/* Check secure link requirement */
+int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
+{
+ BT_DBG("hcon %p", conn);
+
+ /* Accept if non-secure or higher security level is required */
+ if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
+ return 1;
+
+ /* Accept if secure or higher security level is already present */
+ if (conn->sec_level == BT_SECURITY_HIGH ||
+ conn->sec_level == BT_SECURITY_FIPS)
+ return 1;
+
+ /* Reject not secure link */
+ return 0;
+}
+EXPORT_SYMBOL(hci_conn_check_secure);
+
+/* Switch role */
+int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
+{
+ BT_DBG("hcon %p", conn);
+
+ if (role == conn->role)
+ return 1;
+
+ if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
+ struct hci_cp_switch_role cp;
+ bacpy(&cp.bdaddr, &conn->dst);
+ cp.role = role;
+ hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(hci_conn_switch_role);
+
+/* Enter active mode */
+void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
+{
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("hcon %p mode %d", conn, conn->mode);
+
+ if (conn->mode != HCI_CM_SNIFF)
+ goto timer;
+
+ if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
+ goto timer;
+
+ if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
+ struct hci_cp_exit_sniff_mode cp;
+ cp.handle = cpu_to_le16(conn->handle);
+ hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
+ }
+
+timer:
+ if (hdev->idle_timeout > 0)
+ queue_delayed_work(hdev->workqueue, &conn->idle_work,
+ msecs_to_jiffies(hdev->idle_timeout));
+}
+
+/* Drop all connection on the device */
+void hci_conn_hash_flush(struct hci_dev *hdev)
+{
+ struct hci_conn_hash *h = &hdev->conn_hash;
+ struct hci_conn *c, *n;
+
+ BT_DBG("hdev %s", hdev->name);
+
+ list_for_each_entry_safe(c, n, &h->list, list) {
+ c->state = BT_CLOSED;
+
+ hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
+ hci_conn_del(c);
+ }
+}
+
+/* Check pending connect attempts */
+void hci_conn_check_pending(struct hci_dev *hdev)
+{
+ struct hci_conn *conn;
+
+ BT_DBG("hdev %s", hdev->name);
+
+ hci_dev_lock(hdev);
+
+ conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
+ if (conn)
+ hci_acl_create_connection(conn);
+
+ hci_dev_unlock(hdev);
+}
+
+static u32 get_link_mode(struct hci_conn *conn)
+{
+ u32 link_mode = 0;
+
+ if (conn->role == HCI_ROLE_MASTER)
+ link_mode |= HCI_LM_MASTER;
+
+ if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
+ link_mode |= HCI_LM_ENCRYPT;
+
+ if (test_bit(HCI_CONN_AUTH, &conn->flags))
+ link_mode |= HCI_LM_AUTH;
+
+ if (test_bit(HCI_CONN_SECURE, &conn->flags))
+ link_mode |= HCI_LM_SECURE;
+
+ if (test_bit(HCI_CONN_FIPS, &conn->flags))
+ link_mode |= HCI_LM_FIPS;
+
+ return link_mode;
+}
+
+int hci_get_conn_list(void __user *arg)
+{
+ struct hci_conn *c;
+ struct hci_conn_list_req req, *cl;
+ struct hci_conn_info *ci;
+ struct hci_dev *hdev;
+ int n = 0, size, err;
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
+ return -EINVAL;
+
+ size = sizeof(req) + req.conn_num * sizeof(*ci);
+
+ cl = kmalloc(size, GFP_KERNEL);
+ if (!cl)
+ return -ENOMEM;
+
+ hdev = hci_dev_get(req.dev_id);
+ if (!hdev) {
+ kfree(cl);
+ return -ENODEV;
+ }
+
+ ci = cl->conn_info;
+
+ hci_dev_lock(hdev);
+ list_for_each_entry(c, &hdev->conn_hash.list, list) {
+ bacpy(&(ci + n)->bdaddr, &c->dst);
+ (ci + n)->handle = c->handle;
+ (ci + n)->type = c->type;
+ (ci + n)->out = c->out;
+ (ci + n)->state = c->state;
+ (ci + n)->link_mode = get_link_mode(c);
+ if (++n >= req.conn_num)
+ break;
+ }
+ hci_dev_unlock(hdev);
+
+ cl->dev_id = hdev->id;
+ cl->conn_num = n;
+ size = sizeof(req) + n * sizeof(*ci);
+
+ hci_dev_put(hdev);
+
+ err = copy_to_user(arg, cl, size);
+ kfree(cl);
+
+ return err ? -EFAULT : 0;
+}
+
+int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
+{
+ struct hci_conn_info_req req;
+ struct hci_conn_info ci;
+ struct hci_conn *conn;
+ char __user *ptr = arg + sizeof(req);
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ hci_dev_lock(hdev);
+ conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
+ if (conn) {
+ bacpy(&ci.bdaddr, &conn->dst);
+ ci.handle = conn->handle;
+ ci.type = conn->type;
+ ci.out = conn->out;
+ ci.state = conn->state;
+ ci.link_mode = get_link_mode(conn);
+ }
+ hci_dev_unlock(hdev);
+
+ if (!conn)
+ return -ENOENT;
+
+ return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
+}
+
+int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
+{
+ struct hci_auth_info_req req;
+ struct hci_conn *conn;
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ hci_dev_lock(hdev);
+ conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
+ if (conn)
+ req.type = conn->auth_type;
+ hci_dev_unlock(hdev);
+
+ if (!conn)
+ return -ENOENT;
+
+ return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
+}
+
+struct hci_chan *hci_chan_create(struct hci_conn *conn)
+{
+ struct hci_dev *hdev = conn->hdev;
+ struct hci_chan *chan;
+
+ BT_DBG("%s hcon %p", hdev->name, conn);
+
+ if (test_bit(HCI_CONN_DROP, &conn->flags)) {
+ BT_DBG("Refusing to create new hci_chan");
+ return NULL;
+ }
+
+ chan = kzalloc(sizeof(*chan), GFP_KERNEL);
+ if (!chan)
+ return NULL;
+
+ chan->conn = hci_conn_get(conn);
+ skb_queue_head_init(&chan->data_q);
+ chan->state = BT_CONNECTED;
+
+ list_add_rcu(&chan->list, &conn->chan_list);
+
+ return chan;
+}
+
+void hci_chan_del(struct hci_chan *chan)
+{
+ struct hci_conn *conn = chan->conn;
+ struct hci_dev *hdev = conn->hdev;
+
+ BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
+
+ list_del_rcu(&chan->list);
+
+ synchronize_rcu();
+
+ /* Prevent new hci_chan's to be created for this hci_conn */
+ set_bit(HCI_CONN_DROP, &conn->flags);
+
+ hci_conn_put(conn);
+
+ skb_queue_purge(&chan->data_q);
+ kfree(chan);
+}
+
+void hci_chan_list_flush(struct hci_conn *conn)
+{
+ struct hci_chan *chan, *n;
+
+ BT_DBG("hcon %p", conn);
+
+ list_for_each_entry_safe(chan, n, &conn->chan_list, list)
+ hci_chan_del(chan);
+}
+
+static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
+ __u16 handle)
+{
+ struct hci_chan *hchan;
+
+ list_for_each_entry(hchan, &hcon->chan_list, list) {
+ if (hchan->handle == handle)
+ return hchan;
+ }
+
+ return NULL;
+}
+
+struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
+{
+ struct hci_conn_hash *h = &hdev->conn_hash;
+ struct hci_conn *hcon;
+ struct hci_chan *hchan = NULL;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(hcon, &h->list, list) {
+ hchan = __hci_chan_lookup_handle(hcon, handle);
+ if (hchan)
+ break;
+ }
+
+ rcu_read_unlock();
+
+ return hchan;
+}