Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 922 insertions, 0 deletions

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
new file mode 100644
index 000000000..f7e006a36
--- /dev/null
+++ b/net/bluetooth/hci_request.c
@@ -0,0 +1,922 @@
+/*
+   BlueZ - Bluetooth protocol stack for Linux
+
+   Copyright (C) 2014 Intel Corporation
+
+   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.
+*/
+
+#include <linux/sched/signal.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/mgmt.h>
+
+#include "smp.h"
+#include "hci_request.h"
+#include "msft.h"
+#include "eir.h"
+
+void hci_req_init(struct hci_request *req, struct hci_dev *hdev)
+{
+	skb_queue_head_init(&req->cmd_q);
+	req->hdev = hdev;
+	req->err = 0;
+}
+
+void hci_req_purge(struct hci_request *req)
+{
+	skb_queue_purge(&req->cmd_q);
+}
+
+bool hci_req_status_pend(struct hci_dev *hdev)
+{
+	return hdev->req_status == HCI_REQ_PEND;
+}
+
+static int req_run(struct hci_request *req, hci_req_complete_t complete,
+		   hci_req_complete_skb_t complete_skb)
+{
+	struct hci_dev *hdev = req->hdev;
+	struct sk_buff *skb;
+	unsigned long flags;
+
+	bt_dev_dbg(hdev, "length %u", skb_queue_len(&req->cmd_q));
+
+	/* If an error occurred during request building, remove all HCI
+	 * commands queued on the HCI request queue.
+	 */
+	if (req->err) {
+		skb_queue_purge(&req->cmd_q);
+		return req->err;
+	}
+
+	/* Do not allow empty requests */
+	if (skb_queue_empty(&req->cmd_q))
+		return -ENODATA;
+
+	skb = skb_peek_tail(&req->cmd_q);
+	if (complete) {
+		bt_cb(skb)->hci.req_complete = complete;
+	} else if (complete_skb) {
+		bt_cb(skb)->hci.req_complete_skb = complete_skb;
+		bt_cb(skb)->hci.req_flags |= HCI_REQ_SKB;
+	}
+
+	spin_lock_irqsave(&hdev->cmd_q.lock, flags);
+	skb_queue_splice_tail(&req->cmd_q, &hdev->cmd_q);
+	spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);
+
+	queue_work(hdev->workqueue, &hdev->cmd_work);
+
+	return 0;
+}
+
+int hci_req_run(struct hci_request *req, hci_req_complete_t complete)
+{
+	return req_run(req, complete, NULL);
+}
+
+int hci_req_run_skb(struct hci_request *req, hci_req_complete_skb_t complete)
+{
+	return req_run(req, NULL, complete);
+}
+
+void hci_req_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode,
+			   struct sk_buff *skb)
+{
+	bt_dev_dbg(hdev, "result 0x%2.2x", result);
+
+	if (hdev->req_status == HCI_REQ_PEND) {
+		hdev->req_result = result;
+		hdev->req_status = HCI_REQ_DONE;
+		if (skb)
+			hdev->req_skb = skb_get(skb);
+		wake_up_interruptible(&hdev->req_wait_q);
+	}
+}
+
+/* Execute request and wait for completion. */
+int __hci_req_sync(struct hci_dev *hdev, int (*func)(struct hci_request *req,
+						     unsigned long opt),
+		   unsigned long opt, u32 timeout, u8 *hci_status)
+{
+	struct hci_request req;
+	int err = 0;
+
+	bt_dev_dbg(hdev, "start");
+
+	hci_req_init(&req, hdev);
+
+	hdev->req_status = HCI_REQ_PEND;
+
+	err = func(&req, opt);
+	if (err) {
+		if (hci_status)
+			*hci_status = HCI_ERROR_UNSPECIFIED;
+		return err;
+	}
+
+	err = hci_req_run_skb(&req, hci_req_sync_complete);
+	if (err < 0) {
+		hdev->req_status = 0;
+
+		/* ENODATA means the HCI request command queue is empty.
+		 * This can happen when a request with conditionals doesn't
+		 * trigger any commands to be sent. This is normal behavior
+		 * and should not trigger an error return.
+		 */
+		if (err == -ENODATA) {
+			if (hci_status)
+				*hci_status = 0;
+			return 0;
+		}
+
+		if (hci_status)
+			*hci_status = HCI_ERROR_UNSPECIFIED;
+
+		return err;
+	}
+
+	err = wait_event_interruptible_timeout(hdev->req_wait_q,
+			hdev->req_status != HCI_REQ_PEND, timeout);
+
+	if (err == -ERESTARTSYS)
+		return -EINTR;
+
+	switch (hdev->req_status) {
+	case HCI_REQ_DONE:
+		err = -bt_to_errno(hdev->req_result);
+		if (hci_status)
+			*hci_status = hdev->req_result;
+		break;
+
+	case HCI_REQ_CANCELED:
+		err = -hdev->req_result;
+		if (hci_status)
+			*hci_status = HCI_ERROR_UNSPECIFIED;
+		break;
+
+	default:
+		err = -ETIMEDOUT;
+		if (hci_status)
+			*hci_status = HCI_ERROR_UNSPECIFIED;
+		break;
+	}
+
+	kfree_skb(hdev->req_skb);
+	hdev->req_skb = NULL;
+	hdev->req_status = hdev->req_result = 0;
+
+	bt_dev_dbg(hdev, "end: err %d", err);
+
+	return err;
+}
+
+int hci_req_sync(struct hci_dev *hdev, int (*req)(struct hci_request *req,
+						  unsigned long opt),
+		 unsigned long opt, u32 timeout, u8 *hci_status)
+{
+	int ret;
+
+	/* Serialize all requests */
+	hci_req_sync_lock(hdev);
+	/* check the state after obtaing the lock to protect the HCI_UP
+	 * against any races from hci_dev_do_close when the controller
+	 * gets removed.
+	 */
+	if (test_bit(HCI_UP, &hdev->flags))
+		ret = __hci_req_sync(hdev, req, opt, timeout, hci_status);
+	else
+		ret = -ENETDOWN;
+	hci_req_sync_unlock(hdev);
+
+	return ret;
+}
+
+struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen,
+				const void *param)
+{
+	int len = HCI_COMMAND_HDR_SIZE + plen;
+	struct hci_command_hdr *hdr;
+	struct sk_buff *skb;
+
+	skb = bt_skb_alloc(len, GFP_ATOMIC);
+	if (!skb)
+		return NULL;
+
+	hdr = skb_put(skb, HCI_COMMAND_HDR_SIZE);
+	hdr->opcode = cpu_to_le16(opcode);
+	hdr->plen   = plen;
+
+	if (plen)
+		skb_put_data(skb, param, plen);
+
+	bt_dev_dbg(hdev, "skb len %d", skb->len);
+
+	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
+	hci_skb_opcode(skb) = opcode;
+
+	return skb;
+}
+
+/* Queue a command to an asynchronous HCI request */
+void hci_req_add_ev(struct hci_request *req, u16 opcode, u32 plen,
+		    const void *param, u8 event)
+{
+	struct hci_dev *hdev = req->hdev;
+	struct sk_buff *skb;
+
+	bt_dev_dbg(hdev, "opcode 0x%4.4x plen %d", opcode, plen);
+
+	/* If an error occurred during request building, there is no point in
+	 * queueing the HCI command. We can simply return.
+	 */
+	if (req->err)
+		return;
+
+	skb = hci_prepare_cmd(hdev, opcode, plen, param);
+	if (!skb) {
+		bt_dev_err(hdev, "no memory for command (opcode 0x%4.4x)",
+			   opcode);
+		req->err = -ENOMEM;
+		return;
+	}
+
+	if (skb_queue_empty(&req->cmd_q))
+		bt_cb(skb)->hci.req_flags |= HCI_REQ_START;
+
+	hci_skb_event(skb) = event;
+
+	skb_queue_tail(&req->cmd_q, skb);
+}
+
+void hci_req_add(struct hci_request *req, u16 opcode, u32 plen,
+		 const void *param)
+{
+	bt_dev_dbg(req->hdev, "HCI_REQ-0x%4.4x", opcode);
+	hci_req_add_ev(req, opcode, plen, param, 0);
+}
+
+static void 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(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) {
+		start_interleave_scan(hdev);
+		bt_dev_dbg(hdev, "starting interleave scan");
+		return true;
+	}
+
+	if (!use_interleaving && is_interleaving)
+		cancel_interleave_scan(hdev);
+
+	return false;
+}
+
+void hci_req_add_le_scan_disable(struct hci_request *req, bool rpa_le_conn)
+{
+	struct hci_dev *hdev = req->hdev;
+
+	if (hdev->scanning_paused) {
+		bt_dev_dbg(hdev, "Scanning is paused for suspend");
+		return;
+	}
+
+	if (use_ext_scan(hdev)) {
+		struct hci_cp_le_set_ext_scan_enable cp;
+
+		memset(&cp, 0, sizeof(cp));
+		cp.enable = LE_SCAN_DISABLE;
+		hci_req_add(req, HCI_OP_LE_SET_EXT_SCAN_ENABLE, sizeof(cp),
+			    &cp);
+	} else {
+		struct hci_cp_le_set_scan_enable cp;
+
+		memset(&cp, 0, sizeof(cp));
+		cp.enable = LE_SCAN_DISABLE;
+		hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
+	}
+
+	/* Disable address resolution */
+	if (hci_dev_test_flag(hdev, HCI_LL_RPA_RESOLUTION) && !rpa_le_conn) {
+		__u8 enable = 0x00;
+
+		hci_req_add(req, HCI_OP_LE_SET_ADDR_RESOLV_ENABLE, 1, &enable);
+	}
+}
+
+static void del_from_accept_list(struct hci_request *req, bdaddr_t *bdaddr,
+				 u8 bdaddr_type)
+{
+	struct hci_cp_le_del_from_accept_list cp;
+
+	cp.bdaddr_type = bdaddr_type;
+	bacpy(&cp.bdaddr, bdaddr);
+
+	bt_dev_dbg(req->hdev, "Remove %pMR (0x%x) from accept list", &cp.bdaddr,
+		   cp.bdaddr_type);
+	hci_req_add(req, HCI_OP_LE_DEL_FROM_ACCEPT_LIST, sizeof(cp), &cp);
+
+	if (use_ll_privacy(req->hdev)) {
+		struct smp_irk *irk;
+
+		irk = hci_find_irk_by_addr(req->hdev, bdaddr, bdaddr_type);
+		if (irk) {
+			struct hci_cp_le_del_from_resolv_list cp;
+
+			cp.bdaddr_type = bdaddr_type;
+			bacpy(&cp.bdaddr, bdaddr);
+
+			hci_req_add(req, HCI_OP_LE_DEL_FROM_RESOLV_LIST,
+				    sizeof(cp), &cp);
+		}
+	}
+}
+
+/* Adds connection to accept list if needed. On error, returns -1. */
+static int add_to_accept_list(struct hci_request *req,
+			      struct hci_conn_params *params, u8 *num_entries,
+			      bool allow_rpa)
+{
+	struct hci_cp_le_add_to_accept_list cp;
+	struct hci_dev *hdev = req->hdev;
+
+	/* Already in accept list */
+	if (hci_bdaddr_list_lookup(&hdev->le_accept_list, &params->addr,
+				   params->addr_type))
+		return 0;
+
+	/* Select filter policy to accept all advertising */
+	if (*num_entries >= hdev->le_accept_list_size)
+		return -1;
+
+	/* 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, &params->addr, params->addr_type)) {
+		return -1;
+	}
+
+	/* During suspend, only wakeable devices can be in accept list */
+	if (hdev->suspended &&
+	    !(params->flags & HCI_CONN_FLAG_REMOTE_WAKEUP))
+		return 0;
+
+	*num_entries += 1;
+	cp.bdaddr_type = params->addr_type;
+	bacpy(&cp.bdaddr, &params->addr);
+
+	bt_dev_dbg(hdev, "Add %pMR (0x%x) to accept list", &cp.bdaddr,
+		   cp.bdaddr_type);
+	hci_req_add(req, HCI_OP_LE_ADD_TO_ACCEPT_LIST, sizeof(cp), &cp);
+
+	if (use_ll_privacy(hdev)) {
+		struct smp_irk *irk;
+
+		irk = hci_find_irk_by_addr(hdev, &params->addr,
+					   params->addr_type);
+		if (irk) {
+			struct hci_cp_le_add_to_resolv_list cp;
+
+			cp.bdaddr_type = params->addr_type;
+			bacpy(&cp.bdaddr, &params->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);
+
+			hci_req_add(req, HCI_OP_LE_ADD_TO_RESOLV_LIST,
+				    sizeof(cp), &cp);
+		}
+	}
+
+	return 0;
+}
+
+static u8 update_accept_list(struct hci_request *req)
+{
+	struct hci_dev *hdev = req->hdev;
+	struct hci_conn_params *params;
+	struct bdaddr_list *b;
+	u8 num_entries = 0;
+	bool pend_conn, pend_report;
+	/* We allow usage of accept list 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))
+		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 queue the
+	 * command to remove it from the controller.
+	 */
+	list_for_each_entry(b, &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 accept list.
+		 */
+		if (!pend_conn && !pend_report) {
+			del_from_accept_list(req, &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 (add_to_accept_list(req, 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 (add_to_accept_list(req, 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;
+}
+
+static bool scan_use_rpa(struct hci_dev *hdev)
+{
+	return hci_dev_test_flag(hdev, HCI_PRIVACY);
+}
+
+static void hci_req_start_scan(struct hci_request *req, u8 type, u16 interval,
+			       u16 window, u8 own_addr_type, u8 filter_policy,
+			       bool filter_dup, bool addr_resolv)
+{
+	struct hci_dev *hdev = req->hdev;
+
+	if (hdev->scanning_paused) {
+		bt_dev_dbg(hdev, "Scanning is paused for suspend");
+		return;
+	}
+
+	if (use_ll_privacy(hdev) && addr_resolv) {
+		u8 enable = 0x01;
+
+		hci_req_add(req, HCI_OP_LE_SET_ADDR_RESOLV_ENABLE, 1, &enable);
+	}
+
+	/* Use ext scanning if set ext scan param and ext scan enable is
+	 * supported
+	 */
+	if (use_ext_scan(hdev)) {
+		struct hci_cp_le_set_ext_scan_params *ext_param_cp;
+		struct hci_cp_le_set_ext_scan_enable ext_enable_cp;
+		struct hci_cp_le_scan_phy_params *phy_params;
+		u8 data[sizeof(*ext_param_cp) + sizeof(*phy_params) * 2];
+		u32 plen;
+
+		ext_param_cp = (void *)data;
+		phy_params = (void *)ext_param_cp->data;
+
+		memset(ext_param_cp, 0, sizeof(*ext_param_cp));
+		ext_param_cp->own_addr_type = own_addr_type;
+		ext_param_cp->filter_policy = filter_policy;
+
+		plen = sizeof(*ext_param_cp);
+
+		if (scan_1m(hdev) || scan_2m(hdev)) {
+			ext_param_cp->scanning_phys |= LE_SCAN_PHY_1M;
+
+			memset(phy_params, 0, sizeof(*phy_params));
+			phy_params->type = type;
+			phy_params->interval = cpu_to_le16(interval);
+			phy_params->window = cpu_to_le16(window);
+
+			plen += sizeof(*phy_params);
+			phy_params++;
+		}
+
+		if (scan_coded(hdev)) {
+			ext_param_cp->scanning_phys |= LE_SCAN_PHY_CODED;
+
+			memset(phy_params, 0, sizeof(*phy_params));
+			phy_params->type = type;
+			phy_params->interval = cpu_to_le16(interval);
+			phy_params->window = cpu_to_le16(window);
+
+			plen += sizeof(*phy_params);
+			phy_params++;
+		}
+
+		hci_req_add(req, HCI_OP_LE_SET_EXT_SCAN_PARAMS,
+			    plen, ext_param_cp);
+
+		memset(&ext_enable_cp, 0, sizeof(ext_enable_cp));
+		ext_enable_cp.enable = LE_SCAN_ENABLE;
+		ext_enable_cp.filter_dup = filter_dup;
+
+		hci_req_add(req, HCI_OP_LE_SET_EXT_SCAN_ENABLE,
+			    sizeof(ext_enable_cp), &ext_enable_cp);
+	} else {
+		struct hci_cp_le_set_scan_param param_cp;
+		struct hci_cp_le_set_scan_enable enable_cp;
+
+		memset(&param_cp, 0, sizeof(param_cp));
+		param_cp.type = type;
+		param_cp.interval = cpu_to_le16(interval);
+		param_cp.window = cpu_to_le16(window);
+		param_cp.own_address_type = own_addr_type;
+		param_cp.filter_policy = filter_policy;
+		hci_req_add(req, HCI_OP_LE_SET_SCAN_PARAM, sizeof(param_cp),
+			    &param_cp);
+
+		memset(&enable_cp, 0, sizeof(enable_cp));
+		enable_cp.enable = LE_SCAN_ENABLE;
+		enable_cp.filter_dup = filter_dup;
+		hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp),
+			    &enable_cp);
+	}
+}
+
+/* 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 void set_random_addr(struct hci_request *req, bdaddr_t *rpa);
+static int hci_update_random_address(struct hci_request *req,
+				     bool require_privacy, bool use_rpa,
+				     u8 *own_addr_type)
+{
+	struct hci_dev *hdev = req->hdev;
+	int err;
+
+	/* If privacy is enabled use a resolvable private address. If
+	 * current RPA has expired or there is something else than
+	 * the current RPA in use, then generate a new one.
+	 */
+	if (use_rpa) {
+		/* If Controller supports LL Privacy use own address type is
+		 * 0x03
+		 */
+		if (use_ll_privacy(hdev))
+			*own_addr_type = ADDR_LE_DEV_RANDOM_RESOLVED;
+		else
+			*own_addr_type = ADDR_LE_DEV_RANDOM;
+
+		if (rpa_valid(hdev))
+			return 0;
+
+		err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa);
+		if (err < 0) {
+			bt_dev_err(hdev, "failed to generate new RPA");
+			return err;
+		}
+
+		set_random_addr(req, &hdev->rpa);
+
+		return 0;
+	}
+
+	/* In case of required privacy without resolvable private address,
+	 * use an non-resolvable private address. This is useful for active
+	 * scanning and non-connectable advertising.
+	 */
+	if (require_privacy) {
+		bdaddr_t nrpa;
+
+		while (true) {
+			/* The non-resolvable private address is generated
+			 * from random six bytes with the two most significant
+			 * bits cleared.
+			 */
+			get_random_bytes(&nrpa, 6);
+			nrpa.b[5] &= 0x3f;
+
+			/* The non-resolvable private address shall not be
+			 * equal to the public address.
+			 */
+			if (bacmp(&hdev->bdaddr, &nrpa))
+				break;
+		}
+
+		*own_addr_type = ADDR_LE_DEV_RANDOM;
+		set_random_addr(req, &nrpa);
+		return 0;
+	}
+
+	/* If forcing static address is in use or there is no public
+	 * address use the static address as random address (but skip
+	 * the HCI command if the current random address is already the
+	 * static one.
+	 *
+	 * In case BR/EDR has been disabled on a dual-mode controller
+	 * and a static address has been configured, then use that
+	 * address instead of the public BR/EDR address.
+	 */
+	if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
+	    !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
+	    (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
+	     bacmp(&hdev->static_addr, BDADDR_ANY))) {
+		*own_addr_type = ADDR_LE_DEV_RANDOM;
+		if (bacmp(&hdev->static_addr, &hdev->random_addr))
+			hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
+				    &hdev->static_addr);
+		return 0;
+	}
+
+	/* Neither privacy nor static address is being used so use a
+	 * public address.
+	 */
+	*own_addr_type = ADDR_LE_DEV_PUBLIC;
+
+	return 0;
+}
+
+/* Ensure to call hci_req_add_le_scan_disable() first to disable the
+ * controller based address resolution to be able to reconfigure
+ * resolving list.
+ */
+void hci_req_add_le_passive_scan(struct hci_request *req)
+{
+	struct hci_dev *hdev = req->hdev;
+	u8 own_addr_type;
+	u8 filter_policy;
+	u16 window, interval;
+	/* Default is to enable duplicates filter */
+	u8 filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
+	/* 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;
+	}
+
+	/* 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(req, false, scan_use_rpa(hdev),
+				      &own_addr_type))
+		return;
+
+	if (hdev->enable_advmon_interleave_scan &&
+	    __hci_update_interleaved_scan(hdev))
+		return;
+
+	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 = update_accept_list(req);
+
+	/* 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 accept list)
+	 * and 0x01 (accept list enabled) use the new filter policies
+	 * 0x02 (no accept list) and 0x03 (accept list 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;
+	} 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;
+
+		/* Disable duplicates filter when scanning for advertisement
+		 * monitor for the following reasons.
+		 *
+		 * For HW pattern filtering (ex. MSFT), Realtek and Qualcomm
+		 * controllers ignore RSSI_Sampling_Period when the duplicates
+		 * filter is enabled.
+		 *
+		 * For SW pattern filtering, when we're not doing interleaved
+		 * scanning, it is necessary to disable duplicates filter,
+		 * otherwise hosts can only receive one advertisement and it's
+		 * impossible to know if a peer is still in range.
+		 */
+		filter_dup = LE_SCAN_FILTER_DUP_DISABLE;
+	} else {
+		window = hdev->le_scan_window;
+		interval = hdev->le_scan_interval;
+	}
+
+	bt_dev_dbg(hdev, "LE passive scan with accept list = %d",
+		   filter_policy);
+	hci_req_start_scan(req, LE_SCAN_PASSIVE, interval, window,
+			   own_addr_type, filter_policy, filter_dup,
+			   addr_resolv);
+}
+
+static int hci_req_add_le_interleaved_scan(struct hci_request *req,
+					   unsigned long opt)
+{
+	struct hci_dev *hdev = req->hdev;
+	int ret = 0;
+
+	hci_dev_lock(hdev);
+
+	if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
+		hci_req_add_le_scan_disable(req, false);
+	hci_req_add_le_passive_scan(req);
+
+	switch (hdev->interleave_scan_state) {
+	case INTERLEAVE_SCAN_ALLOWLIST:
+		bt_dev_dbg(hdev, "next state: allowlist");
+		hdev->interleave_scan_state = INTERLEAVE_SCAN_NO_FILTER;
+		break;
+	case INTERLEAVE_SCAN_NO_FILTER:
+		bt_dev_dbg(hdev, "next state: no filter");
+		hdev->interleave_scan_state = INTERLEAVE_SCAN_ALLOWLIST;
+		break;
+	case INTERLEAVE_SCAN_NONE:
+		BT_ERR("unexpected error");
+		ret = -1;
+	}
+
+	hci_dev_unlock(hdev);
+
+	return ret;
+}
+
+static void interleave_scan_work(struct work_struct *work)
+{
+	struct hci_dev *hdev = container_of(work, struct hci_dev,
+					    interleave_scan.work);
+	u8 status;
+	unsigned long timeout;
+
+	if (hdev->interleave_scan_state == INTERLEAVE_SCAN_ALLOWLIST) {
+		timeout = msecs_to_jiffies(hdev->advmon_allowlist_duration);
+	} else if (hdev->interleave_scan_state == INTERLEAVE_SCAN_NO_FILTER) {
+		timeout = msecs_to_jiffies(hdev->advmon_no_filter_duration);
+	} else {
+		bt_dev_err(hdev, "unexpected error");
+		return;
+	}
+
+	hci_req_sync(hdev, hci_req_add_le_interleaved_scan, 0,
+		     HCI_CMD_TIMEOUT, &status);
+
+	/* Don't continue interleaving if it was canceled */
+	if (is_interleave_scanning(hdev))
+		queue_delayed_work(hdev->req_workqueue,
+				   &hdev->interleave_scan, timeout);
+}
+
+static void set_random_addr(struct hci_request *req, bdaddr_t *rpa)
+{
+	struct hci_dev *hdev = req->hdev;
+
+	/* If we're advertising or initiating an LE connection we can't
+	 * go ahead and change the random address at this time. This is
+	 * because the eventual initiator address used for the
+	 * subsequently created connection will be undefined (some
+	 * controllers use the new address and others the one we had
+	 * when the operation started).
+	 *
+	 * In this kind of scenario skip the update and let the random
+	 * address be updated at the next cycle.
+	 */
+	if (hci_dev_test_flag(hdev, HCI_LE_ADV) ||
+	    hci_lookup_le_connect(hdev)) {
+		bt_dev_dbg(hdev, "Deferring random address update");
+		hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
+		return;
+	}
+
+	hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6, rpa);
+}
+
+void hci_request_setup(struct hci_dev *hdev)
+{
+	INIT_DELAYED_WORK(&hdev->interleave_scan, interleave_scan_work);
+}
+
+void hci_request_cancel_all(struct hci_dev *hdev)
+{
+	__hci_cmd_sync_cancel(hdev, ENODEV);
+
+	cancel_interleave_scan(hdev);
+}