return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_ENABLE,
sizeof(enable), &enable, HCI_CMD_TIMEOUT);
}
+
+static int hci_le_set_ext_scan_enable_sync(struct hci_dev *hdev, u8 val,
+ u8 filter_dup)
+{
+ struct hci_cp_le_set_ext_scan_enable cp;
+
+ memset(&cp, 0, sizeof(cp));
+ cp.enable = val;
+ cp.filter_dup = filter_dup;
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_SCAN_ENABLE,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+}
+
+static int hci_le_set_scan_enable_sync(struct hci_dev *hdev, u8 val,
+ u8 filter_dup)
+{
+ struct hci_cp_le_set_scan_enable cp;
+
+ if (use_ext_scan(hdev))
+ return hci_le_set_ext_scan_enable_sync(hdev, val, filter_dup);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.enable = val;
+ cp.filter_dup = filter_dup;
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_SCAN_ENABLE,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+}
+
+static int hci_le_set_addr_resolution_enable_sync(struct hci_dev *hdev, u8 val)
+{
+ if (!use_ll_privacy(hdev) ||
+ !hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY))
+ return 0;
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADDR_RESOLV_ENABLE,
+ sizeof(val), &val, HCI_CMD_TIMEOUT);
+}
+
+int hci_scan_disable_sync(struct hci_dev *hdev, bool rpa_le_conn)
+{
+ int err;
+
+ /* If controller is not scanning we are done. */
+ if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
+ return 0;
+
+ if (hdev->scanning_paused) {
+ bt_dev_dbg(hdev, "Scanning is paused for suspend");
+ return 0;
+ }
+
+ if (hdev->suspended)
+ set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks);
+
+ err = hci_le_set_scan_enable_sync(hdev, LE_SCAN_DISABLE, 0x00);
+ if (err) {
+ bt_dev_err(hdev, "Unable to disable scanning: %d", err);
+ return err;
+ }
+
+ if (rpa_le_conn) {
+ err = hci_le_set_addr_resolution_enable_sync(hdev, 0x00);
+ if (err)
+ bt_dev_err(hdev, "Unable to disable LL privacy: %d",
+ err);
+ }
+
+ return err;
+}
+
+static bool scan_use_rpa(struct hci_dev *hdev)
+{
+ return hci_dev_test_flag(hdev, HCI_PRIVACY);
+}
+
+static void hci_start_interleave_scan(struct hci_dev *hdev)
+{
+ hdev->interleave_scan_state = INTERLEAVE_SCAN_NO_FILTER;
+ queue_delayed_work(hdev->req_workqueue,
+ &hdev->interleave_scan, 0);
+}
+
+static bool is_interleave_scanning(struct hci_dev *hdev)
+{
+ return hdev->interleave_scan_state != INTERLEAVE_SCAN_NONE;
+}
+
+static void cancel_interleave_scan(struct hci_dev *hdev)
+{
+ bt_dev_dbg(hdev, "cancelling interleave scan");
+
+ cancel_delayed_work_sync(&hdev->interleave_scan);
+
+ hdev->interleave_scan_state = INTERLEAVE_SCAN_NONE;
+}
+
+/* Return true if interleave_scan wasn't started until exiting this function,
+ * otherwise, return false
+ */
+static bool hci_update_interleaved_scan_sync(struct hci_dev *hdev)
+{
+ /* Do interleaved scan only if all of the following are true:
+ * - There is at least one ADV monitor
+ * - At least one pending LE connection or one device to be scanned for
+ * - Monitor offloading is not supported
+ * If so, we should alternate between allowlist scan and one without
+ * any filters to save power.
+ */
+ bool use_interleaving = hci_is_adv_monitoring(hdev) &&
+ !(list_empty(&hdev->pend_le_conns) &&
+ list_empty(&hdev->pend_le_reports)) &&
+ hci_get_adv_monitor_offload_ext(hdev) ==
+ HCI_ADV_MONITOR_EXT_NONE;
+ bool is_interleaving = is_interleave_scanning(hdev);
+
+ if (use_interleaving && !is_interleaving) {
+ hci_start_interleave_scan(hdev);
+ bt_dev_dbg(hdev, "starting interleave scan");
+ return true;
+ }
+
+ if (!use_interleaving && is_interleaving)
+ cancel_interleave_scan(hdev);
+
+ return false;
+}
+
+/* Removes connection to resolve list if needed.*/
+static int hci_le_del_resolve_list_sync(struct hci_dev *hdev,
+ bdaddr_t *bdaddr, u8 bdaddr_type)
+{
+ struct hci_cp_le_del_from_resolv_list cp;
+ struct bdaddr_list_with_irk *entry;
+
+ if (!use_ll_privacy(hdev) ||
+ !hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY))
+ return 0;
+
+ /* Check if the IRK has been programmed */
+ entry = hci_bdaddr_list_lookup_with_irk(&hdev->le_resolv_list, bdaddr,
+ bdaddr_type);
+ if (!entry)
+ return 0;
+
+ cp.bdaddr_type = bdaddr_type;
+ bacpy(&cp.bdaddr, bdaddr);
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_DEL_FROM_RESOLV_LIST,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+}
+
+static int hci_le_del_accept_list_sync(struct hci_dev *hdev,
+ bdaddr_t *bdaddr, u8 bdaddr_type)
+{
+ struct hci_cp_le_del_from_accept_list cp;
+ int err;
+
+ /* Check if device is on accept list before removing it */
+ if (!hci_bdaddr_list_lookup(&hdev->le_accept_list, bdaddr, bdaddr_type))
+ return 0;
+
+ cp.bdaddr_type = bdaddr_type;
+ bacpy(&cp.bdaddr, bdaddr);
+
+ err = __hci_cmd_sync_status(hdev, HCI_OP_LE_DEL_FROM_ACCEPT_LIST,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+ if (err) {
+ bt_dev_err(hdev, "Unable to remove from allow list: %d", err);
+ return err;
+ }
+
+ bt_dev_dbg(hdev, "Remove %pMR (0x%x) from allow list", &cp.bdaddr,
+ cp.bdaddr_type);
+
+ return hci_le_del_resolve_list_sync(hdev, &cp.bdaddr, cp.bdaddr_type);
+}
+
+/* Adds connection to resolve list if needed.*/
+static int hci_le_add_resolve_list_sync(struct hci_dev *hdev,
+ struct hci_conn_params *params)
+{
+ struct hci_cp_le_add_to_resolv_list cp;
+ struct smp_irk *irk;
+ struct bdaddr_list_with_irk *entry;
+
+ if (!use_ll_privacy(hdev) ||
+ !hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY))
+ return 0;
+
+ irk = hci_find_irk_by_addr(hdev, ¶ms->addr, params->addr_type);
+ if (!irk)
+ return 0;
+
+ /* Check if the IK has _not_ been programmed yet. */
+ entry = hci_bdaddr_list_lookup_with_irk(&hdev->le_resolv_list,
+ ¶ms->addr,
+ params->addr_type);
+ if (entry)
+ return 0;
+
+ cp.bdaddr_type = params->addr_type;
+ bacpy(&cp.bdaddr, ¶ms->addr);
+ memcpy(cp.peer_irk, irk->val, 16);
+
+ if (hci_dev_test_flag(hdev, HCI_PRIVACY))
+ memcpy(cp.local_irk, hdev->irk, 16);
+ else
+ memset(cp.local_irk, 0, 16);
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_ADD_TO_RESOLV_LIST,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+}
+
+/* Adds connection to allow list if needed, if the device uses RPA (has IRK)
+ * this attempts to program the device in the resolving list as well.
+ */
+static int hci_le_add_accept_list_sync(struct hci_dev *hdev,
+ struct hci_conn_params *params,
+ u8 *num_entries, bool allow_rpa)
+{
+ struct hci_cp_le_add_to_accept_list cp;
+ int err;
+
+ /* Already in accept list */
+ if (hci_bdaddr_list_lookup(&hdev->le_accept_list, ¶ms->addr,
+ params->addr_type))
+ return 0;
+
+ /* Select filter policy to accept all advertising */
+ if (*num_entries >= hdev->le_accept_list_size)
+ return -ENOSPC;
+
+ /* Accept list can not be used with RPAs */
+ if (!allow_rpa &&
+ !hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY) &&
+ hci_find_irk_by_addr(hdev, ¶ms->addr, params->addr_type)) {
+ return -EINVAL;
+ }
+
+ /* During suspend, only wakeable devices can be in acceptlist */
+ if (hdev->suspended && !hci_conn_test_flag(HCI_CONN_FLAG_REMOTE_WAKEUP,
+ params->current_flags))
+ return 0;
+
+ *num_entries += 1;
+ cp.bdaddr_type = params->addr_type;
+ bacpy(&cp.bdaddr, ¶ms->addr);
+
+ err = __hci_cmd_sync_status(hdev, HCI_OP_LE_ADD_TO_ACCEPT_LIST,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+ if (err) {
+ bt_dev_err(hdev, "Unable to add to allow list: %d", err);
+ return err;
+ }
+
+ bt_dev_dbg(hdev, "Add %pMR (0x%x) to allow list", &cp.bdaddr,
+ cp.bdaddr_type);
+
+ return hci_le_add_resolve_list_sync(hdev, params);
+}
+
+static u8 hci_update_accept_list_sync(struct hci_dev *hdev)
+{
+ struct hci_conn_params *params;
+ struct bdaddr_list *b, *t;
+ u8 num_entries = 0;
+ bool pend_conn, pend_report;
+ /* We allow acceptlisting even with RPAs in suspend. In the worst case,
+ * we won't be able to wake from devices that use the privacy1.2
+ * features. Additionally, once we support privacy1.2 and IRK
+ * offloading, we can update this to also check for those conditions.
+ */
+ bool allow_rpa = hdev->suspended;
+
+ if (use_ll_privacy(hdev) &&
+ hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY))
+ allow_rpa = true;
+
+ /* Go through the current accept list programmed into the
+ * controller one by one and check if that address is still
+ * in the list of pending connections or list of devices to
+ * report. If not present in either list, then remove it from
+ * the controller.
+ */
+ list_for_each_entry_safe(b, t, &hdev->le_accept_list, list) {
+ pend_conn = hci_pend_le_action_lookup(&hdev->pend_le_conns,
+ &b->bdaddr,
+ b->bdaddr_type);
+ pend_report = hci_pend_le_action_lookup(&hdev->pend_le_reports,
+ &b->bdaddr,
+ b->bdaddr_type);
+
+ /* If the device is not likely to connect or report,
+ * remove it from the acceptlist.
+ */
+ if (!pend_conn && !pend_report) {
+ hci_le_del_accept_list_sync(hdev, &b->bdaddr,
+ b->bdaddr_type);
+ continue;
+ }
+
+ /* Accept list can not be used with RPAs */
+ if (!allow_rpa &&
+ !hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY) &&
+ hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) {
+ return 0x00;
+ }
+
+ num_entries++;
+ }
+
+ /* Since all no longer valid accept list entries have been
+ * removed, walk through the list of pending connections
+ * and ensure that any new device gets programmed into
+ * the controller.
+ *
+ * If the list of the devices is larger than the list of
+ * available accept list entries in the controller, then
+ * just abort and return filer policy value to not use the
+ * accept list.
+ */
+ list_for_each_entry(params, &hdev->pend_le_conns, action) {
+ if (hci_le_add_accept_list_sync(hdev, params, &num_entries,
+ allow_rpa))
+ return 0x00;
+ }
+
+ /* After adding all new pending connections, walk through
+ * the list of pending reports and also add these to the
+ * accept list if there is still space. Abort if space runs out.
+ */
+ list_for_each_entry(params, &hdev->pend_le_reports, action) {
+ if (hci_le_add_accept_list_sync(hdev, params, &num_entries,
+ allow_rpa))
+ return 0x00;
+ }
+
+ /* Use the allowlist unless the following conditions are all true:
+ * - We are not currently suspending
+ * - There are 1 or more ADV monitors registered and it's not offloaded
+ * - Interleaved scanning is not currently using the allowlist
+ */
+ if (!idr_is_empty(&hdev->adv_monitors_idr) && !hdev->suspended &&
+ hci_get_adv_monitor_offload_ext(hdev) == HCI_ADV_MONITOR_EXT_NONE &&
+ hdev->interleave_scan_state != INTERLEAVE_SCAN_ALLOWLIST)
+ return 0x00;
+
+ /* Select filter policy to use accept list */
+ return 0x01;
+}
+
+/* Returns true if an le connection is in the scanning state */
+static inline bool hci_is_le_conn_scanning(struct hci_dev *hdev)
+{
+ struct hci_conn_hash *h = &hdev->conn_hash;
+ struct hci_conn *c;
+
+ rcu_read_lock();
+
+ list_for_each_entry_rcu(c, &h->list, list) {
+ if (c->type == LE_LINK && c->state == BT_CONNECT &&
+ test_bit(HCI_CONN_SCANNING, &c->flags)) {
+ rcu_read_unlock();
+ return true;
+ }
+ }
+
+ rcu_read_unlock();
+
+ return false;
+}
+
+static int hci_le_set_ext_scan_param_sync(struct hci_dev *hdev, u8 type,
+ u16 interval, u16 window,
+ u8 own_addr_type, u8 filter_policy)
+{
+ struct hci_cp_le_set_ext_scan_params *cp;
+ struct hci_cp_le_scan_phy_params *phy;
+ u8 data[sizeof(*cp) + sizeof(*phy) * 2];
+ u8 num_phy = 0;
+
+ cp = (void *)data;
+ phy = (void *)cp->data;
+
+ memset(data, 0, sizeof(data));
+
+ cp->own_addr_type = own_addr_type;
+ cp->filter_policy = filter_policy;
+
+ if (scan_1m(hdev) || scan_2m(hdev)) {
+ cp->scanning_phys |= LE_SCAN_PHY_1M;
+
+ phy->type = type;
+ phy->interval = cpu_to_le16(interval);
+ phy->window = cpu_to_le16(window);
+
+ num_phy++;
+ phy++;
+ }
+
+ if (scan_coded(hdev)) {
+ cp->scanning_phys |= LE_SCAN_PHY_CODED;
+
+ phy->type = type;
+ phy->interval = cpu_to_le16(interval);
+ phy->window = cpu_to_le16(window);
+
+ num_phy++;
+ phy++;
+ }
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_SCAN_PARAMS,
+ sizeof(*cp) + sizeof(*phy) * num_phy,
+ data, HCI_CMD_TIMEOUT);
+}
+
+static int hci_le_set_scan_param_sync(struct hci_dev *hdev, u8 type,
+ u16 interval, u16 window,
+ u8 own_addr_type, u8 filter_policy)
+{
+ struct hci_cp_le_set_scan_param cp;
+
+ if (use_ext_scan(hdev))
+ return hci_le_set_ext_scan_param_sync(hdev, type, interval,
+ window, own_addr_type,
+ filter_policy);
+
+ memset(&cp, 0, sizeof(cp));
+ cp.type = type;
+ cp.interval = cpu_to_le16(interval);
+ cp.window = cpu_to_le16(window);
+ cp.own_address_type = own_addr_type;
+ cp.filter_policy = filter_policy;
+
+ return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_SCAN_PARAM,
+ sizeof(cp), &cp, HCI_CMD_TIMEOUT);
+}
+
+static int hci_start_scan_sync(struct hci_dev *hdev, u8 type, u16 interval,
+ u16 window, u8 own_addr_type, u8 filter_policy,
+ bool addr_resolv)
+{
+ int err;
+
+ if (hdev->scanning_paused) {
+ bt_dev_dbg(hdev, "Scanning is paused for suspend");
+ return 0;
+ }
+
+ if (addr_resolv) {
+ err = hci_le_set_addr_resolution_enable_sync(hdev, 0x01);
+ if (err)
+ return err;
+ }
+
+ err = hci_le_set_scan_param_sync(hdev, type, interval, window,
+ own_addr_type, filter_policy);
+ if (err)
+ return err;
+
+ return hci_le_set_scan_enable_sync(hdev, LE_SCAN_ENABLE,
+ LE_SCAN_FILTER_DUP_ENABLE);
+}
+
+/* Ensure to call hci_scan_disable_sync first to disable the controller based
+ * address resolution to be able to reconfigure resolving list.
+ */
+int hci_passive_scan_sync(struct hci_dev *hdev)
+{
+ u8 own_addr_type;
+ u8 filter_policy;
+ u16 window, interval;
+ /* Background scanning should run with address resolution */
+ bool addr_resolv = true;
+
+ if (hdev->scanning_paused) {
+ bt_dev_dbg(hdev, "Scanning is paused for suspend");
+ return 0;
+ }
+
+ /* Set require_privacy to false since no SCAN_REQ are send
+ * during passive scanning. Not using an non-resolvable address
+ * here is important so that peer devices using direct
+ * advertising with our address will be correctly reported
+ * by the controller.
+ */
+ if (hci_update_random_address_sync(hdev, false, scan_use_rpa(hdev),
+ &own_addr_type))
+ return 0;
+
+ if (hdev->enable_advmon_interleave_scan &&
+ hci_update_interleaved_scan_sync(hdev))
+ return 0;
+
+ bt_dev_dbg(hdev, "interleave state %d", hdev->interleave_scan_state);
+ /* Adding or removing entries from the accept list must
+ * happen before enabling scanning. The controller does
+ * not allow accept list modification while scanning.
+ */
+ filter_policy = hci_update_accept_list_sync(hdev);
+
+ /* When the controller is using random resolvable addresses and
+ * with that having LE privacy enabled, then controllers with
+ * Extended Scanner Filter Policies support can now enable support
+ * for handling directed advertising.
+ *
+ * So instead of using filter polices 0x00 (no acceptlist)
+ * and 0x01 (acceptlist enabled) use the new filter policies
+ * 0x02 (no acceptlist) and 0x03 (acceptlist enabled).
+ */
+ if (hci_dev_test_flag(hdev, HCI_PRIVACY) &&
+ (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY))
+ filter_policy |= 0x02;
+
+ if (hdev->suspended) {
+ window = hdev->le_scan_window_suspend;
+ interval = hdev->le_scan_int_suspend;
+
+ set_bit(SUSPEND_SCAN_ENABLE, hdev->suspend_tasks);
+ } else if (hci_is_le_conn_scanning(hdev)) {
+ window = hdev->le_scan_window_connect;
+ interval = hdev->le_scan_int_connect;
+ } else if (hci_is_adv_monitoring(hdev)) {
+ window = hdev->le_scan_window_adv_monitor;
+ interval = hdev->le_scan_int_adv_monitor;
+ } else {
+ window = hdev->le_scan_window;
+ interval = hdev->le_scan_interval;
+ }
+
+ bt_dev_dbg(hdev, "LE passive scan with acceptlist = %d", filter_policy);
+
+ return hci_start_scan_sync(hdev, LE_SCAN_PASSIVE, interval, window,
+ own_addr_type, filter_policy, addr_resolv);
+}
+
+/* This function controls the passive scanning based on hdev->pend_le_conns
+ * list. If there are pending LE connection we start the background scanning,
+ * otherwise we stop it.
+ */
+int hci_update_passive_scan_sync(struct hci_dev *hdev)
+{
+ int err;
+
+ if (!test_bit(HCI_UP, &hdev->flags) ||
+ test_bit(HCI_INIT, &hdev->flags) ||
+ hci_dev_test_flag(hdev, HCI_SETUP) ||
+ hci_dev_test_flag(hdev, HCI_CONFIG) ||
+ hci_dev_test_flag(hdev, HCI_AUTO_OFF) ||
+ hci_dev_test_flag(hdev, HCI_UNREGISTER))
+ return 0;
+
+ /* No point in doing scanning if LE support hasn't been enabled */
+ if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
+ return 0;
+
+ /* If discovery is active don't interfere with it */
+ if (hdev->discovery.state != DISCOVERY_STOPPED)
+ return 0;
+
+ /* Reset RSSI and UUID filters when starting background scanning
+ * since these filters are meant for service discovery only.
+ *
+ * The Start Discovery and Start Service Discovery operations
+ * ensure to set proper values for RSSI threshold and UUID
+ * filter list. So it is safe to just reset them here.
+ */
+ hci_discovery_filter_clear(hdev);
+
+ bt_dev_dbg(hdev, "ADV monitoring is %s",
+ hci_is_adv_monitoring(hdev) ? "on" : "off");
+
+ if (list_empty(&hdev->pend_le_conns) &&
+ list_empty(&hdev->pend_le_reports) &&
+ !hci_is_adv_monitoring(hdev)) {
+ /* If there is no pending LE connections or devices
+ * to be scanned for or no ADV monitors, we should stop the
+ * background scanning.
+ */
+
+ bt_dev_dbg(hdev, "stopping background scanning");
+
+ err = hci_scan_disable_sync(hdev, false);
+ if (err)
+ bt_dev_err(hdev, "stop background scanning failed: %d",
+ err);
+ } else {
+ /* If there is at least one pending LE connection, we should
+ * keep the background scan running.
+ */
+
+ /* If controller is connecting, we should not start scanning
+ * since some controllers are not able to scan and connect at
+ * the same time.
+ */
+ if (hci_lookup_le_connect(hdev))
+ return 0;
+
+ err = hci_scan_disable_sync(hdev, false);
+ if (err) {
+ bt_dev_err(hdev, "stop background scanning failed: %d",
+ err);
+ return err;
+ }
+
+ bt_dev_dbg(hdev, "start background scanning");
+
+ err = hci_passive_scan_sync(hdev);
+ if (err)
+ bt_dev_err(hdev, "start background scanning failed: %d",
+ err);
+ }
+
+ return err;
+}
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