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hci_request.c
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hci_request.c
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/*
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"
#define HCI_REQ_DONE 0
#define HCI_REQ_PEND 1
#define HCI_REQ_CANCELED 2
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);
}
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_DBG("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);
}
static void hci_req_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode,
struct sk_buff *skb)
{
BT_DBG("%s result 0x%2.2x", hdev->name, 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);
}
}
void hci_req_sync_cancel(struct hci_dev *hdev, int err)
{
BT_DBG("%s err 0x%2.2x", hdev->name, err);
if (hdev->req_status == HCI_REQ_PEND) {
hdev->req_result = err;
hdev->req_status = HCI_REQ_CANCELED;
wake_up_interruptible(&hdev->req_wait_q);
}
}
struct sk_buff *__hci_cmd_sync_ev(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param, u8 event, u32 timeout)
{
DECLARE_WAITQUEUE(wait, current);
struct hci_request req;
struct sk_buff *skb;
int err = 0;
BT_DBG("%s", hdev->name);
hci_req_init(&req, hdev);
hci_req_add_ev(&req, opcode, plen, param, event);
hdev->req_status = HCI_REQ_PEND;
add_wait_queue(&hdev->req_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
err = hci_req_run_skb(&req, hci_req_sync_complete);
if (err < 0) {
remove_wait_queue(&hdev->req_wait_q, &wait);
set_current_state(TASK_RUNNING);
return ERR_PTR(err);
}
schedule_timeout(timeout);
remove_wait_queue(&hdev->req_wait_q, &wait);
if (signal_pending(current))
return ERR_PTR(-EINTR);
switch (hdev->req_status) {
case HCI_REQ_DONE:
err = -bt_to_errno(hdev->req_result);
break;
case HCI_REQ_CANCELED:
err = -hdev->req_result;
break;
default:
err = -ETIMEDOUT;
break;
}
hdev->req_status = hdev->req_result = 0;
skb = hdev->req_skb;
hdev->req_skb = NULL;
BT_DBG("%s end: err %d", hdev->name, err);
if (err < 0) {
kfree_skb(skb);
return ERR_PTR(err);
}
if (!skb)
return ERR_PTR(-ENODATA);
return skb;
}
EXPORT_SYMBOL(__hci_cmd_sync_ev);
struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param, u32 timeout)
{
return __hci_cmd_sync_ev(hdev, opcode, plen, param, 0, timeout);
}
EXPORT_SYMBOL(__hci_cmd_sync);
/* 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;
DECLARE_WAITQUEUE(wait, current);
int err = 0;
BT_DBG("%s start", hdev->name);
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;
}
add_wait_queue(&hdev->req_wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
err = hci_req_run_skb(&req, hci_req_sync_complete);
if (err < 0) {
hdev->req_status = 0;
remove_wait_queue(&hdev->req_wait_q, &wait);
set_current_state(TASK_RUNNING);
/* 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;
}
schedule_timeout(timeout);
remove_wait_queue(&hdev->req_wait_q, &wait);
if (signal_pending(current))
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_DBG("%s end: err %d", hdev->name, 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;
if (!test_bit(HCI_UP, &hdev->flags))
return -ENETDOWN;
/* Serialize all requests */
hci_req_sync_lock(hdev);
ret = __hci_req_sync(hdev, req, opt, timeout, hci_status);
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_DBG("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_DBG("%s opcode 0x%4.4x plen %d", hdev->name, 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;
bt_cb(skb)->hci.req_event = event;
skb_queue_tail(&req->cmd_q, skb);
}
void hci_req_add(struct hci_request *req, u16 opcode, u32 plen,
const void *param)
{
hci_req_add_ev(req, opcode, plen, param, 0);
}
void __hci_req_write_fast_connectable(struct hci_request *req, bool enable)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_write_page_scan_activity acp;
u8 type;
if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
return;
if (hdev->hci_ver < BLUETOOTH_VER_1_2)
return;
if (enable) {
type = PAGE_SCAN_TYPE_INTERLACED;
/* 160 msec page scan interval */
acp.interval = cpu_to_le16(0x0100);
} else {
type = PAGE_SCAN_TYPE_STANDARD; /* default */
/* default 1.28 sec page scan */
acp.interval = cpu_to_le16(0x0800);
}
acp.window = cpu_to_le16(0x0012);
if (__cpu_to_le16(hdev->page_scan_interval) != acp.interval ||
__cpu_to_le16(hdev->page_scan_window) != acp.window)
hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_ACTIVITY,
sizeof(acp), &acp);
if (hdev->page_scan_type != type)
hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_TYPE, 1, &type);
}
/* This function controls the background scanning based on hdev->pend_le_conns
* list. If there are pending LE connection we start the background scanning,
* otherwise we stop it.
*
* This function requires the caller holds hdev->lock.
*/
static void __hci_update_background_scan(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
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;
/* No point in doing scanning if LE support hasn't been enabled */
if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
return;
/* If discovery is active don't interfere with it */
if (hdev->discovery.state != DISCOVERY_STOPPED)
return;
/* 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);
if (list_empty(&hdev->pend_le_conns) &&
list_empty(&hdev->pend_le_reports)) {
/* If there is no pending LE connections or devices
* to be scanned for, we should stop the background
* scanning.
*/
/* If controller is not scanning we are done. */
if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
return;
hci_req_add_le_scan_disable(req);
BT_DBG("%s stopping background scanning", hdev->name);
} 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;
/* If controller is currently scanning, we stop it to ensure we
* don't miss any advertising (due to duplicates filter).
*/
if (hci_dev_test_flag(hdev, HCI_LE_SCAN))
hci_req_add_le_scan_disable(req);
hci_req_add_le_passive_scan(req);
BT_DBG("%s starting background scanning", hdev->name);
}
}
void __hci_req_update_name(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_write_local_name cp;
memcpy(cp.name, hdev->dev_name, sizeof(cp.name));
hci_req_add(req, HCI_OP_WRITE_LOCAL_NAME, sizeof(cp), &cp);
}
#define PNP_INFO_SVCLASS_ID 0x1200
static u8 *create_uuid16_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
u8 *ptr = data, *uuids_start = NULL;
struct bt_uuid *uuid;
if (len < 4)
return ptr;
list_for_each_entry(uuid, &hdev->uuids, list) {
u16 uuid16;
if (uuid->size != 16)
continue;
uuid16 = get_unaligned_le16(&uuid->uuid[12]);
if (uuid16 < 0x1100)
continue;
if (uuid16 == PNP_INFO_SVCLASS_ID)
continue;
if (!uuids_start) {
uuids_start = ptr;
uuids_start[0] = 1;
uuids_start[1] = EIR_UUID16_ALL;
ptr += 2;
}
/* Stop if not enough space to put next UUID */
if ((ptr - data) + sizeof(u16) > len) {
uuids_start[1] = EIR_UUID16_SOME;
break;
}
*ptr++ = (uuid16 & 0x00ff);
*ptr++ = (uuid16 & 0xff00) >> 8;
uuids_start[0] += sizeof(uuid16);
}
return ptr;
}
static u8 *create_uuid32_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
u8 *ptr = data, *uuids_start = NULL;
struct bt_uuid *uuid;
if (len < 6)
return ptr;
list_for_each_entry(uuid, &hdev->uuids, list) {
if (uuid->size != 32)
continue;
if (!uuids_start) {
uuids_start = ptr;
uuids_start[0] = 1;
uuids_start[1] = EIR_UUID32_ALL;
ptr += 2;
}
/* Stop if not enough space to put next UUID */
if ((ptr - data) + sizeof(u32) > len) {
uuids_start[1] = EIR_UUID32_SOME;
break;
}
memcpy(ptr, &uuid->uuid[12], sizeof(u32));
ptr += sizeof(u32);
uuids_start[0] += sizeof(u32);
}
return ptr;
}
static u8 *create_uuid128_list(struct hci_dev *hdev, u8 *data, ptrdiff_t len)
{
u8 *ptr = data, *uuids_start = NULL;
struct bt_uuid *uuid;
if (len < 18)
return ptr;
list_for_each_entry(uuid, &hdev->uuids, list) {
if (uuid->size != 128)
continue;
if (!uuids_start) {
uuids_start = ptr;
uuids_start[0] = 1;
uuids_start[1] = EIR_UUID128_ALL;
ptr += 2;
}
/* Stop if not enough space to put next UUID */
if ((ptr - data) + 16 > len) {
uuids_start[1] = EIR_UUID128_SOME;
break;
}
memcpy(ptr, uuid->uuid, 16);
ptr += 16;
uuids_start[0] += 16;
}
return ptr;
}
static void create_eir(struct hci_dev *hdev, u8 *data)
{
u8 *ptr = data;
size_t name_len;
name_len = strlen(hdev->dev_name);
if (name_len > 0) {
/* EIR Data type */
if (name_len > 48) {
name_len = 48;
ptr[1] = EIR_NAME_SHORT;
} else
ptr[1] = EIR_NAME_COMPLETE;
/* EIR Data length */
ptr[0] = name_len + 1;
memcpy(ptr + 2, hdev->dev_name, name_len);
ptr += (name_len + 2);
}
if (hdev->inq_tx_power != HCI_TX_POWER_INVALID) {
ptr[0] = 2;
ptr[1] = EIR_TX_POWER;
ptr[2] = (u8) hdev->inq_tx_power;
ptr += 3;
}
if (hdev->devid_source > 0) {
ptr[0] = 9;
ptr[1] = EIR_DEVICE_ID;
put_unaligned_le16(hdev->devid_source, ptr + 2);
put_unaligned_le16(hdev->devid_vendor, ptr + 4);
put_unaligned_le16(hdev->devid_product, ptr + 6);
put_unaligned_le16(hdev->devid_version, ptr + 8);
ptr += 10;
}
ptr = create_uuid16_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
ptr = create_uuid32_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
ptr = create_uuid128_list(hdev, ptr, HCI_MAX_EIR_LENGTH - (ptr - data));
}
void __hci_req_update_eir(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_write_eir cp;
if (!hdev_is_powered(hdev))
return;
if (!lmp_ext_inq_capable(hdev))
return;
if (!hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
return;
if (hci_dev_test_flag(hdev, HCI_SERVICE_CACHE))
return;
memset(&cp, 0, sizeof(cp));
create_eir(hdev, cp.data);
if (memcmp(cp.data, hdev->eir, sizeof(cp.data)) == 0)
return;
memcpy(hdev->eir, cp.data, sizeof(cp.data));
hci_req_add(req, HCI_OP_WRITE_EIR, sizeof(cp), &cp);
}
void hci_req_add_le_scan_disable(struct hci_request *req)
{
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);
}
static void add_to_white_list(struct hci_request *req,
struct hci_conn_params *params)
{
struct hci_cp_le_add_to_white_list cp;
cp.bdaddr_type = params->addr_type;
bacpy(&cp.bdaddr, ¶ms->addr);
hci_req_add(req, HCI_OP_LE_ADD_TO_WHITE_LIST, sizeof(cp), &cp);
}
static u8 update_white_list(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
struct hci_conn_params *params;
struct bdaddr_list *b;
uint8_t white_list_entries = 0;
/* Go through the current white 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_white_list, list) {
/* If the device is neither in pend_le_conns nor
* pend_le_reports then remove it from the whitelist.
*/
if (!hci_pend_le_action_lookup(&hdev->pend_le_conns,
&b->bdaddr, b->bdaddr_type) &&
!hci_pend_le_action_lookup(&hdev->pend_le_reports,
&b->bdaddr, b->bdaddr_type)) {
struct hci_cp_le_del_from_white_list cp;
cp.bdaddr_type = b->bdaddr_type;
bacpy(&cp.bdaddr, &b->bdaddr);
hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST,
sizeof(cp), &cp);
continue;
}
if (hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) {
/* White list can not be used with RPAs */
return 0x00;
}
white_list_entries++;
}
/* Since all no longer valid white 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 white list entries in the controller, then
* just abort and return filer policy value to not use the
* white list.
*/
list_for_each_entry(params, &hdev->pend_le_conns, action) {
if (hci_bdaddr_list_lookup(&hdev->le_white_list,
¶ms->addr, params->addr_type))
continue;
if (white_list_entries >= hdev->le_white_list_size) {
/* Select filter policy to accept all advertising */
return 0x00;
}
if (hci_find_irk_by_addr(hdev, ¶ms->addr,
params->addr_type)) {
/* White list can not be used with RPAs */
return 0x00;
}
white_list_entries++;
add_to_white_list(req, params);
}
/* After adding all new pending connections, walk through
* the list of pending reports and also add these to the
* white list if there is still space.
*/
list_for_each_entry(params, &hdev->pend_le_reports, action) {
if (hci_bdaddr_list_lookup(&hdev->le_white_list,
¶ms->addr, params->addr_type))
continue;
if (white_list_entries >= hdev->le_white_list_size) {
/* Select filter policy to accept all advertising */
return 0x00;
}
if (hci_find_irk_by_addr(hdev, ¶ms->addr,
params->addr_type)) {
/* White list can not be used with RPAs */
return 0x00;
}
white_list_entries++;
add_to_white_list(req, params);
}
/* Select filter policy to use white list */
return 0x01;
}
static bool scan_use_rpa(struct hci_dev *hdev)
{
return hci_dev_test_flag(hdev, HCI_PRIVACY);
}
void hci_req_add_le_passive_scan(struct hci_request *req)
{
struct hci_cp_le_set_scan_param param_cp;
struct hci_cp_le_set_scan_enable enable_cp;
struct hci_dev *hdev = req->hdev;
u8 own_addr_type;
u8 filter_policy;
/* 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;
/* Adding or removing entries from the white list must
* happen before enabling scanning. The controller does
* not allow white list modification while scanning.
*/
filter_policy = update_white_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 whitelist)
* and 0x01 (whitelist enabled) use the new filter policies
* 0x02 (no whitelist) and 0x03 (whitelist enabled).
*/
if (hci_dev_test_flag(hdev, HCI_PRIVACY) &&
(hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY))
filter_policy |= 0x02;
memset(¶m_cp, 0, sizeof(param_cp));
param_cp.type = LE_SCAN_PASSIVE;
param_cp.interval = cpu_to_le16(hdev->le_scan_interval);
param_cp.window = cpu_to_le16(hdev->le_scan_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),
¶m_cp);
memset(&enable_cp, 0, sizeof(enable_cp));
enable_cp.enable = LE_SCAN_ENABLE;
enable_cp.filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
hci_req_add(req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(enable_cp),
&enable_cp);
}
static u8 get_cur_adv_instance_scan_rsp_len(struct hci_dev *hdev)
{
u8 instance = hdev->cur_adv_instance;
struct adv_info *adv_instance;
/* Ignore instance 0 */
if (instance == 0x00)
return 0;
adv_instance = hci_find_adv_instance(hdev, instance);
if (!adv_instance)
return 0;
/* TODO: Take into account the "appearance" and "local-name" flags here.
* These are currently being ignored as they are not supported.
*/
return adv_instance->scan_rsp_len;
}
void __hci_req_disable_advertising(struct hci_request *req)
{
u8 enable = 0x00;
hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}
static u32 get_adv_instance_flags(struct hci_dev *hdev, u8 instance)
{
u32 flags;
struct adv_info *adv_instance;
if (instance == 0x00) {
/* Instance 0 always manages the "Tx Power" and "Flags"
* fields
*/
flags = MGMT_ADV_FLAG_TX_POWER | MGMT_ADV_FLAG_MANAGED_FLAGS;
/* For instance 0, the HCI_ADVERTISING_CONNECTABLE setting
* corresponds to the "connectable" instance flag.
*/
if (hci_dev_test_flag(hdev, HCI_ADVERTISING_CONNECTABLE))
flags |= MGMT_ADV_FLAG_CONNECTABLE;
if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
flags |= MGMT_ADV_FLAG_LIMITED_DISCOV;
else if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
flags |= MGMT_ADV_FLAG_DISCOV;
return flags;
}
adv_instance = hci_find_adv_instance(hdev, instance);
/* Return 0 when we got an invalid instance identifier. */
if (!adv_instance)
return 0;
return adv_instance->flags;
}
static bool adv_use_rpa(struct hci_dev *hdev, uint32_t flags)
{
/* If privacy is not enabled don't use RPA */
if (!hci_dev_test_flag(hdev, HCI_PRIVACY))
return false;
/* If basic privacy mode is enabled use RPA */
if (!hci_dev_test_flag(hdev, HCI_LIMITED_PRIVACY))
return true;
/* If limited privacy mode is enabled don't use RPA if we're
* both discoverable and bondable.
*/
if ((flags & MGMT_ADV_FLAG_DISCOV) &&
hci_dev_test_flag(hdev, HCI_BONDABLE))
return false;
/* We're neither bondable nor discoverable in the limited
* privacy mode, therefore use RPA.
*/
return true;
}
static bool is_advertising_allowed(struct hci_dev *hdev, bool connectable)
{
/* If there is no connection we are OK to advertise. */
if (hci_conn_num(hdev, LE_LINK) == 0)
return true;
/* Check le_states if there is any connection in slave role. */
if (hdev->conn_hash.le_num_slave > 0) {
/* Slave connection state and non connectable mode bit 20. */
if (!connectable && !(hdev->le_states[2] & 0x10))
return false;
/* Slave connection state and connectable mode bit 38
* and scannable bit 21.
*/
if (connectable && (!(hdev->le_states[4] & 0x40) ||
!(hdev->le_states[2] & 0x20)))
return false;
}
/* Check le_states if there is any connection in master role. */
if (hci_conn_num(hdev, LE_LINK) != hdev->conn_hash.le_num_slave) {
/* Master connection state and non connectable mode bit 18. */
if (!connectable && !(hdev->le_states[2] & 0x02))
return false;
/* Master connection state and connectable mode bit 35 and
* scannable 19.
*/
if (connectable && (!(hdev->le_states[4] & 0x08) ||
!(hdev->le_states[2] & 0x08)))
return false;
}
return true;
}
void __hci_req_enable_advertising(struct hci_request *req)
{
struct hci_dev *hdev = req->hdev;
struct hci_cp_le_set_adv_param cp;
u8 own_addr_type, enable = 0x01;
bool connectable;
u32 flags;
flags = get_adv_instance_flags(hdev, hdev->cur_adv_instance);
/* If the "connectable" instance flag was not set, then choose between
* ADV_IND and ADV_NONCONN_IND based on the global connectable setting.
*/
connectable = (flags & MGMT_ADV_FLAG_CONNECTABLE) ||
mgmt_get_connectable(hdev);
if (!is_advertising_allowed(hdev, connectable))
return;
if (hci_dev_test_flag(hdev, HCI_LE_ADV))
__hci_req_disable_advertising(req);
/* 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 true only when non-connectable
* advertising is used. In that case it is fine to use a
* non-resolvable private address.
*/
if (hci_update_random_address(req, !connectable,
adv_use_rpa(hdev, flags),
&own_addr_type) < 0)
return;
memset(&cp, 0, sizeof(cp));
cp.min_interval = cpu_to_le16(hdev->le_adv_min_interval);
cp.max_interval = cpu_to_le16(hdev->le_adv_max_interval);