/*
   BlueZ - Bluetooth protocol stack for Linux

   Copyright (C) 2010  Nokia Corporation
   Copyright (C) 2011-2012 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.
*/

/* Bluetooth HCI Management interface */

#include <linux/module.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/hci_sock.h>
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/mgmt.h>

#include "hci_request.h"
#include "smp.h"
#include "mgmt_util.h"

#define MGMT_VERSION    1
#define MGMT_REVISION   10

static const u16 mgmt_commands[] = {
        MGMT_OP_READ_INDEX_LIST,
        MGMT_OP_READ_INFO,
        MGMT_OP_SET_POWERED,
        MGMT_OP_SET_DISCOVERABLE,
        MGMT_OP_SET_CONNECTABLE,
        MGMT_OP_SET_FAST_CONNECTABLE,
        MGMT_OP_SET_BONDABLE,
        MGMT_OP_SET_LINK_SECURITY,
        MGMT_OP_SET_SSP,
        MGMT_OP_SET_HS,
        MGMT_OP_SET_LE,
        MGMT_OP_SET_DEV_CLASS,
        MGMT_OP_SET_LOCAL_NAME,
        MGMT_OP_ADD_UUID,
        MGMT_OP_REMOVE_UUID,
        MGMT_OP_LOAD_LINK_KEYS,
        MGMT_OP_LOAD_LONG_TERM_KEYS,
        MGMT_OP_DISCONNECT,
        MGMT_OP_GET_CONNECTIONS,
        MGMT_OP_PIN_CODE_REPLY,
        MGMT_OP_PIN_CODE_NEG_REPLY,
        MGMT_OP_SET_IO_CAPABILITY,
        MGMT_OP_PAIR_DEVICE,
        MGMT_OP_CANCEL_PAIR_DEVICE,
        MGMT_OP_UNPAIR_DEVICE,
        MGMT_OP_USER_CONFIRM_REPLY,
        MGMT_OP_USER_CONFIRM_NEG_REPLY,
        MGMT_OP_USER_PASSKEY_REPLY,
        MGMT_OP_USER_PASSKEY_NEG_REPLY,
        MGMT_OP_READ_LOCAL_OOB_DATA,
        MGMT_OP_ADD_REMOTE_OOB_DATA,
        MGMT_OP_REMOVE_REMOTE_OOB_DATA,
        MGMT_OP_START_DISCOVERY,
        MGMT_OP_STOP_DISCOVERY,
        MGMT_OP_CONFIRM_NAME,
        MGMT_OP_BLOCK_DEVICE,
        MGMT_OP_UNBLOCK_DEVICE,
        MGMT_OP_SET_DEVICE_ID,
        MGMT_OP_SET_ADVERTISING,
        MGMT_OP_SET_BREDR,
        MGMT_OP_SET_STATIC_ADDRESS,
        MGMT_OP_SET_SCAN_PARAMS,
        MGMT_OP_SET_SECURE_CONN,
        MGMT_OP_SET_DEBUG_KEYS,
        MGMT_OP_SET_PRIVACY,
        MGMT_OP_LOAD_IRKS,
        MGMT_OP_GET_CONN_INFO,
        MGMT_OP_GET_CLOCK_INFO,
        MGMT_OP_ADD_DEVICE,
        MGMT_OP_REMOVE_DEVICE,
        MGMT_OP_LOAD_CONN_PARAM,
        MGMT_OP_READ_UNCONF_INDEX_LIST,
        MGMT_OP_READ_CONFIG_INFO,
        MGMT_OP_SET_EXTERNAL_CONFIG,
        MGMT_OP_SET_PUBLIC_ADDRESS,
        MGMT_OP_START_SERVICE_DISCOVERY,
        MGMT_OP_READ_LOCAL_OOB_EXT_DATA,
        MGMT_OP_READ_EXT_INDEX_LIST,
        MGMT_OP_READ_ADV_FEATURES,
        MGMT_OP_ADD_ADVERTISING,
        MGMT_OP_REMOVE_ADVERTISING,
};

static const u16 mgmt_events[] = {
        MGMT_EV_CONTROLLER_ERROR,
        MGMT_EV_INDEX_ADDED,
        MGMT_EV_INDEX_REMOVED,
        MGMT_EV_NEW_SETTINGS,
        MGMT_EV_CLASS_OF_DEV_CHANGED,
        MGMT_EV_LOCAL_NAME_CHANGED,
        MGMT_EV_NEW_LINK_KEY,
        MGMT_EV_NEW_LONG_TERM_KEY,
        MGMT_EV_DEVICE_CONNECTED,
        MGMT_EV_DEVICE_DISCONNECTED,
        MGMT_EV_CONNECT_FAILED,
        MGMT_EV_PIN_CODE_REQUEST,
        MGMT_EV_USER_CONFIRM_REQUEST,
        MGMT_EV_USER_PASSKEY_REQUEST,
        MGMT_EV_AUTH_FAILED,
        MGMT_EV_DEVICE_FOUND,
        MGMT_EV_DISCOVERING,
        MGMT_EV_DEVICE_BLOCKED,
        MGMT_EV_DEVICE_UNBLOCKED,
        MGMT_EV_DEVICE_UNPAIRED,
        MGMT_EV_PASSKEY_NOTIFY,
        MGMT_EV_NEW_IRK,
        MGMT_EV_NEW_CSRK,
        MGMT_EV_DEVICE_ADDED,
        MGMT_EV_DEVICE_REMOVED,
        MGMT_EV_NEW_CONN_PARAM,
        MGMT_EV_UNCONF_INDEX_ADDED,
        MGMT_EV_UNCONF_INDEX_REMOVED,
        MGMT_EV_NEW_CONFIG_OPTIONS,
        MGMT_EV_EXT_INDEX_ADDED,
        MGMT_EV_EXT_INDEX_REMOVED,
        MGMT_EV_LOCAL_OOB_DATA_UPDATED,
        MGMT_EV_ADVERTISING_ADDED,
        MGMT_EV_ADVERTISING_REMOVED,
};

static const u16 mgmt_untrusted_commands[] = {
        MGMT_OP_READ_INDEX_LIST,
        MGMT_OP_READ_INFO,
        MGMT_OP_READ_UNCONF_INDEX_LIST,
        MGMT_OP_READ_CONFIG_INFO,
        MGMT_OP_READ_EXT_INDEX_LIST,
};

static const u16 mgmt_untrusted_events[] = {
        MGMT_EV_INDEX_ADDED,
        MGMT_EV_INDEX_REMOVED,
        MGMT_EV_NEW_SETTINGS,
        MGMT_EV_CLASS_OF_DEV_CHANGED,
        MGMT_EV_LOCAL_NAME_CHANGED,
        MGMT_EV_UNCONF_INDEX_ADDED,
        MGMT_EV_UNCONF_INDEX_REMOVED,
        MGMT_EV_NEW_CONFIG_OPTIONS,
        MGMT_EV_EXT_INDEX_ADDED,
        MGMT_EV_EXT_INDEX_REMOVED,
};

#define CACHE_TIMEOUT   msecs_to_jiffies(2 * 1000)

#define ZERO_KEY "\x00\x00\x00\x00\x00\x00\x00\x00" \
                 "\x00\x00\x00\x00\x00\x00\x00\x00"

/* HCI to MGMT error code conversion table */
static u8 mgmt_status_table[] = {
        MGMT_STATUS_SUCCESS,
        MGMT_STATUS_UNKNOWN_COMMAND,    /* Unknown Command */
        MGMT_STATUS_NOT_CONNECTED,      /* No Connection */
        MGMT_STATUS_FAILED,             /* Hardware Failure */
        MGMT_STATUS_CONNECT_FAILED,     /* Page Timeout */
        MGMT_STATUS_AUTH_FAILED,        /* Authentication Failed */
        MGMT_STATUS_AUTH_FAILED,        /* PIN or Key Missing */
        MGMT_STATUS_NO_RESOURCES,       /* Memory Full */
        MGMT_STATUS_TIMEOUT,            /* Connection Timeout */
        MGMT_STATUS_NO_RESOURCES,       /* Max Number of Connections */
        MGMT_STATUS_NO_RESOURCES,       /* Max Number of SCO Connections */
        MGMT_STATUS_ALREADY_CONNECTED,  /* ACL Connection Exists */
        MGMT_STATUS_BUSY,               /* Command Disallowed */
        MGMT_STATUS_NO_RESOURCES,       /* Rejected Limited Resources */
        MGMT_STATUS_REJECTED,           /* Rejected Security */
        MGMT_STATUS_REJECTED,           /* Rejected Personal */
        MGMT_STATUS_TIMEOUT,            /* Host Timeout */
        MGMT_STATUS_NOT_SUPPORTED,      /* Unsupported Feature */
        MGMT_STATUS_INVALID_PARAMS,     /* Invalid Parameters */
        MGMT_STATUS_DISCONNECTED,       /* OE User Ended Connection */
        MGMT_STATUS_NO_RESOURCES,       /* OE Low Resources */
        MGMT_STATUS_DISCONNECTED,       /* OE Power Off */
        MGMT_STATUS_DISCONNECTED,       /* Connection Terminated */
        MGMT_STATUS_BUSY,               /* Repeated Attempts */
        MGMT_STATUS_REJECTED,           /* Pairing Not Allowed */
        MGMT_STATUS_FAILED,             /* Unknown LMP PDU */
        MGMT_STATUS_NOT_SUPPORTED,      /* Unsupported Remote Feature */
        MGMT_STATUS_REJECTED,           /* SCO Offset Rejected */
        MGMT_STATUS_REJECTED,           /* SCO Interval Rejected */
        MGMT_STATUS_REJECTED,           /* Air Mode Rejected */
        MGMT_STATUS_INVALID_PARAMS,     /* Invalid LMP Parameters */
        MGMT_STATUS_FAILED,             /* Unspecified Error */
        MGMT_STATUS_NOT_SUPPORTED,      /* Unsupported LMP Parameter Value */
        MGMT_STATUS_FAILED,             /* Role Change Not Allowed */
        MGMT_STATUS_TIMEOUT,            /* LMP Response Timeout */
        MGMT_STATUS_FAILED,             /* LMP Error Transaction Collision */
        MGMT_STATUS_FAILED,             /* LMP PDU Not Allowed */
        MGMT_STATUS_REJECTED,           /* Encryption Mode Not Accepted */
        MGMT_STATUS_FAILED,             /* Unit Link Key Used */
        MGMT_STATUS_NOT_SUPPORTED,      /* QoS Not Supported */
        MGMT_STATUS_TIMEOUT,            /* Instant Passed */
        MGMT_STATUS_NOT_SUPPORTED,      /* Pairing Not Supported */
        MGMT_STATUS_FAILED,             /* Transaction Collision */
        MGMT_STATUS_INVALID_PARAMS,     /* Unacceptable Parameter */
        MGMT_STATUS_REJECTED,           /* QoS Rejected */
        MGMT_STATUS_NOT_SUPPORTED,      /* Classification Not Supported */
        MGMT_STATUS_REJECTED,           /* Insufficient Security */
        MGMT_STATUS_INVALID_PARAMS,     /* Parameter Out Of Range */
        MGMT_STATUS_BUSY,               /* Role Switch Pending */
        MGMT_STATUS_FAILED,             /* Slot Violation */
        MGMT_STATUS_FAILED,             /* Role Switch Failed */
        MGMT_STATUS_INVALID_PARAMS,     /* EIR Too Large */
        MGMT_STATUS_NOT_SUPPORTED,      /* Simple Pairing Not Supported */
        MGMT_STATUS_BUSY,               /* Host Busy Pairing */
        MGMT_STATUS_REJECTED,           /* Rejected, No Suitable Channel */
        MGMT_STATUS_BUSY,               /* Controller Busy */
        MGMT_STATUS_INVALID_PARAMS,     /* Unsuitable Connection Interval */
        MGMT_STATUS_TIMEOUT,            /* Directed Advertising Timeout */
        MGMT_STATUS_AUTH_FAILED,        /* Terminated Due to MIC Failure */
        MGMT_STATUS_CONNECT_FAILED,     /* Connection Establishment Failed */
        MGMT_STATUS_CONNECT_FAILED,     /* MAC Connection Failed */
};

static u8 mgmt_status(u8 hci_status)
{
        if (hci_status < ARRAY_SIZE(mgmt_status_table))
                return mgmt_status_table[hci_status];

        return MGMT_STATUS_FAILED;
}

static int mgmt_index_event(u16 event, struct hci_dev *hdev, void *data,
                            u16 len, int flag)
{
        return mgmt_send_event(event, hdev, HCI_CHANNEL_CONTROL, data, len,
                               flag, NULL);
}

static int mgmt_limited_event(u16 event, struct hci_dev *hdev, void *data,
                              u16 len, int flag, struct sock *skip_sk)
{
        return mgmt_send_event(event, hdev, HCI_CHANNEL_CONTROL, data, len,
                               flag, skip_sk);
}

static int mgmt_generic_event(u16 event, struct hci_dev *hdev, void *data,
                              u16 len, struct sock *skip_sk)
{
        return mgmt_send_event(event, hdev, HCI_CHANNEL_CONTROL, data, len,
                               HCI_MGMT_GENERIC_EVENTS, skip_sk);
}

static int mgmt_event(u16 event, struct hci_dev *hdev, void *data, u16 len,
                      struct sock *skip_sk)
{
        return mgmt_send_event(event, hdev, HCI_CHANNEL_CONTROL, data, len,
                               HCI_SOCK_TRUSTED, skip_sk);
}

static int read_version(struct sock *sk, struct hci_dev *hdev, void *data,
                        u16 data_len)
{
        struct mgmt_rp_read_version rp;

        BT_DBG("sock %p", sk);

        rp.version = MGMT_VERSION;
        rp.revision = cpu_to_le16(MGMT_REVISION);

        return mgmt_cmd_complete(sk, MGMT_INDEX_NONE, MGMT_OP_READ_VERSION, 0,
                                 &rp, sizeof(rp));
}

static int read_commands(struct sock *sk, struct hci_dev *hdev, void *data,
                         u16 data_len)
{
        struct mgmt_rp_read_commands *rp;
        u16 num_commands, num_events;
        size_t rp_size;
        int i, err;

        BT_DBG("sock %p", sk);

        if (hci_sock_test_flag(sk, HCI_SOCK_TRUSTED)) {
                num_commands = ARRAY_SIZE(mgmt_commands);
                num_events = ARRAY_SIZE(mgmt_events);
        } else {
                num_commands = ARRAY_SIZE(mgmt_untrusted_commands);
                num_events = ARRAY_SIZE(mgmt_untrusted_events);
        }

        rp_size = sizeof(*rp) + ((num_commands + num_events) * sizeof(u16));

        rp = kmalloc(rp_size, GFP_KERNEL);
        if (!rp)
                return -ENOMEM;

        rp->num_commands = cpu_to_le16(num_commands);
        rp->num_events = cpu_to_le16(num_events);

        if (hci_sock_test_flag(sk, HCI_SOCK_TRUSTED)) {
                __le16 *opcode = rp->opcodes;

                for (i = 0; i < num_commands; i++, opcode++)
                        put_unaligned_le16(mgmt_commands[i], opcode);

                for (i = 0; i < num_events; i++, opcode++)
                        put_unaligned_le16(mgmt_events[i], opcode);
        } else {
                __le16 *opcode = rp->opcodes;

                for (i = 0; i < num_commands; i++, opcode++)
                        put_unaligned_le16(mgmt_untrusted_commands[i], opcode);

                for (i = 0; i < num_events; i++, opcode++)
                        put_unaligned_le16(mgmt_untrusted_events[i], opcode);
        }

        err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE, MGMT_OP_READ_COMMANDS, 0,
                                rp, rp_size);
        kfree(rp);

        return err;
}

static int read_index_list(struct sock *sk, struct hci_dev *hdev, void *data,
                           u16 data_len)
{
        struct mgmt_rp_read_index_list *rp;
        struct hci_dev *d;
        size_t rp_len;
        u16 count;
        int err;

        BT_DBG("sock %p", sk);

        read_lock(&hci_dev_list_lock);

        count = 0;
        list_for_each_entry(d, &hci_dev_list, list) {
                if (d->dev_type == HCI_BREDR &&
                    !hci_dev_test_flag(d, HCI_UNCONFIGURED))
                        count++;
        }

        rp_len = sizeof(*rp) + (2 * count);
        rp = kmalloc(rp_len, GFP_ATOMIC);
        if (!rp) {
                read_unlock(&hci_dev_list_lock);
                return -ENOMEM;
        }

        count = 0;
        list_for_each_entry(d, &hci_dev_list, list) {
                if (hci_dev_test_flag(d, HCI_SETUP) ||
                    hci_dev_test_flag(d, HCI_CONFIG) ||
                    hci_dev_test_flag(d, HCI_USER_CHANNEL))
                        continue;

                /* Devices marked as raw-only are neither configured
                 * nor unconfigured controllers.
                 */
                if (test_bit(HCI_QUIRK_RAW_DEVICE, &d->quirks))
                        continue;

                if (d->dev_type == HCI_BREDR &&
                    !hci_dev_test_flag(d, HCI_UNCONFIGURED)) {
                        rp->index[count++] = cpu_to_le16(d->id);
                        BT_DBG("Added hci%u", d->id);
                }
        }

        rp->num_controllers = cpu_to_le16(count);
        rp_len = sizeof(*rp) + (2 * count);

        read_unlock(&hci_dev_list_lock);

        err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE, MGMT_OP_READ_INDEX_LIST,
                                0, rp, rp_len);

        kfree(rp);

        return err;
}

static int read_unconf_index_list(struct sock *sk, struct hci_dev *hdev,
                                  void *data, u16 data_len)
{
        struct mgmt_rp_read_unconf_index_list *rp;
        struct hci_dev *d;
        size_t rp_len;
        u16 count;
        int err;

        BT_DBG("sock %p", sk);

        read_lock(&hci_dev_list_lock);

        count = 0;
        list_for_each_entry(d, &hci_dev_list, list) {
                if (d->dev_type == HCI_BREDR &&
                    hci_dev_test_flag(d, HCI_UNCONFIGURED))
                        count++;
        }

        rp_len = sizeof(*rp) + (2 * count);
        rp = kmalloc(rp_len, GFP_ATOMIC);
        if (!rp) {
                read_unlock(&hci_dev_list_lock);
                return -ENOMEM;
        }

        count = 0;
        list_for_each_entry(d, &hci_dev_list, list) {
                if (hci_dev_test_flag(d, HCI_SETUP) ||
                    hci_dev_test_flag(d, HCI_CONFIG) ||
                    hci_dev_test_flag(d, HCI_USER_CHANNEL))
                        continue;

                /* Devices marked as raw-only are neither configured
                 * nor unconfigured controllers.
                 */
                if (test_bit(HCI_QUIRK_RAW_DEVICE, &d->quirks))
                        continue;

                if (d->dev_type == HCI_BREDR &&
                    hci_dev_test_flag(d, HCI_UNCONFIGURED)) {
                        rp->index[count++] = cpu_to_le16(d->id);
                        BT_DBG("Added hci%u", d->id);
                }
        }

        rp->num_controllers = cpu_to_le16(count);
        rp_len = sizeof(*rp) + (2 * count);

        read_unlock(&hci_dev_list_lock);

        err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE,
                                MGMT_OP_READ_UNCONF_INDEX_LIST, 0, rp, rp_len);

        kfree(rp);

        return err;
}

static int read_ext_index_list(struct sock *sk, struct hci_dev *hdev,
                               void *data, u16 data_len)
{
        struct mgmt_rp_read_ext_index_list *rp;
        struct hci_dev *d;
        size_t rp_len;
        u16 count;
        int err;

        BT_DBG("sock %p", sk);

        read_lock(&hci_dev_list_lock);

        count = 0;
        list_for_each_entry(d, &hci_dev_list, list) {
                if (d->dev_type == HCI_BREDR || d->dev_type == HCI_AMP)
                        count++;
        }

        rp_len = sizeof(*rp) + (sizeof(rp->entry[0]) * count);
        rp = kmalloc(rp_len, GFP_ATOMIC);
        if (!rp) {
                read_unlock(&hci_dev_list_lock);
                return -ENOMEM;
        }

        count = 0;
        list_for_each_entry(d, &hci_dev_list, list) {
                if (hci_dev_test_flag(d, HCI_SETUP) ||
                    hci_dev_test_flag(d, HCI_CONFIG) ||
                    hci_dev_test_flag(d, HCI_USER_CHANNEL))
                        continue;

                /* Devices marked as raw-only are neither configured
                 * nor unconfigured controllers.
                 */
                if (test_bit(HCI_QUIRK_RAW_DEVICE, &d->quirks))
                        continue;

                if (d->dev_type == HCI_BREDR) {
                        if (hci_dev_test_flag(d, HCI_UNCONFIGURED))
                                rp->entry[count].type = 0x01;
                        else
                                rp->entry[count].type = 0x00;
                } else if (d->dev_type == HCI_AMP) {
                        rp->entry[count].type = 0x02;
                } else {
                        continue;
                }

                rp->entry[count].bus = d->bus;
                rp->entry[count++].index = cpu_to_le16(d->id);
                BT_DBG("Added hci%u", d->id);
        }

        rp->num_controllers = cpu_to_le16(count);
        rp_len = sizeof(*rp) + (sizeof(rp->entry[0]) * count);

        read_unlock(&hci_dev_list_lock);

        /* If this command is called at least once, then all the
         * default index and unconfigured index events are disabled
         * and from now on only extended index events are used.
         */
        hci_sock_set_flag(sk, HCI_MGMT_EXT_INDEX_EVENTS);
        hci_sock_clear_flag(sk, HCI_MGMT_INDEX_EVENTS);
        hci_sock_clear_flag(sk, HCI_MGMT_UNCONF_INDEX_EVENTS);

        err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE,
                                MGMT_OP_READ_EXT_INDEX_LIST, 0, rp, rp_len);

        kfree(rp);

        return err;
}

static bool is_configured(struct hci_dev *hdev)
{
        if (test_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks) &&
            !hci_dev_test_flag(hdev, HCI_EXT_CONFIGURED))
                return false;

        if (test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks) &&
            !bacmp(&hdev->public_addr, BDADDR_ANY))
                return false;

        return true;
}

static __le32 get_missing_options(struct hci_dev *hdev)
{
        u32 options = 0;

        if (test_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks) &&
            !hci_dev_test_flag(hdev, HCI_EXT_CONFIGURED))
                options |= MGMT_OPTION_EXTERNAL_CONFIG;

        if (test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks) &&
            !bacmp(&hdev->public_addr, BDADDR_ANY))
                options |= MGMT_OPTION_PUBLIC_ADDRESS;

        return cpu_to_le32(options);
}

static int new_options(struct hci_dev *hdev, struct sock *skip)
{
        __le32 options = get_missing_options(hdev);

        return mgmt_generic_event(MGMT_EV_NEW_CONFIG_OPTIONS, hdev, &options,
                                  sizeof(options), skip);
}

static int send_options_rsp(struct sock *sk, u16 opcode, struct hci_dev *hdev)
{
        __le32 options = get_missing_options(hdev);

        return mgmt_cmd_complete(sk, hdev->id, opcode, 0, &options,
                                 sizeof(options));
}

static int read_config_info(struct sock *sk, struct hci_dev *hdev,
                            void *data, u16 data_len)
{
        struct mgmt_rp_read_config_info rp;
        u32 options = 0;

        BT_DBG("sock %p %s", sk, hdev->name);

        hci_dev_lock(hdev);

        memset(&rp, 0, sizeof(rp));
        rp.manufacturer = cpu_to_le16(hdev->manufacturer);

        if (test_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks))
                options |= MGMT_OPTION_EXTERNAL_CONFIG;

        if (hdev->set_bdaddr)
                options |= MGMT_OPTION_PUBLIC_ADDRESS;

        rp.supported_options = cpu_to_le32(options);
        rp.missing_options = get_missing_options(hdev);

        hci_dev_unlock(hdev);

        return mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_CONFIG_INFO, 0,
                                 &rp, sizeof(rp));
}

static u32 get_supported_settings(struct hci_dev *hdev)
{
        u32 settings = 0;

        settings |= MGMT_SETTING_POWERED;
        settings |= MGMT_SETTING_BONDABLE;
        settings |= MGMT_SETTING_DEBUG_KEYS;
        settings |= MGMT_SETTING_CONNECTABLE;
        settings |= MGMT_SETTING_DISCOVERABLE;

        if (lmp_bredr_capable(hdev)) {
                if (hdev->hci_ver >= BLUETOOTH_VER_1_2)
                        settings |= MGMT_SETTING_FAST_CONNECTABLE;
                settings |= MGMT_SETTING_BREDR;
                settings |= MGMT_SETTING_LINK_SECURITY;

                if (lmp_ssp_capable(hdev)) {
                        settings |= MGMT_SETTING_SSP;
                        settings |= MGMT_SETTING_HS;
                }

                if (lmp_sc_capable(hdev))
                        settings |= MGMT_SETTING_SECURE_CONN;
        }

        if (lmp_le_capable(hdev)) {
                settings |= MGMT_SETTING_LE;
                settings |= MGMT_SETTING_ADVERTISING;
                settings |= MGMT_SETTING_SECURE_CONN;
                settings |= MGMT_SETTING_PRIVACY;
                settings |= MGMT_SETTING_STATIC_ADDRESS;
        }

        if (test_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks) ||
            hdev->set_bdaddr)
                settings |= MGMT_SETTING_CONFIGURATION;

        return settings;
}

static u32 get_current_settings(struct hci_dev *hdev)
{
        u32 settings = 0;

        if (hdev_is_powered(hdev))
                settings |= MGMT_SETTING_POWERED;

        if (hci_dev_test_flag(hdev, HCI_CONNECTABLE))
                settings |= MGMT_SETTING_CONNECTABLE;

        if (hci_dev_test_flag(hdev, HCI_FAST_CONNECTABLE))
                settings |= MGMT_SETTING_FAST_CONNECTABLE;

        if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
                settings |= MGMT_SETTING_DISCOVERABLE;

        if (hci_dev_test_flag(hdev, HCI_BONDABLE))
                settings |= MGMT_SETTING_BONDABLE;

        if (hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                settings |= MGMT_SETTING_BREDR;

        if (hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                settings |= MGMT_SETTING_LE;

        if (hci_dev_test_flag(hdev, HCI_LINK_SECURITY))
                settings |= MGMT_SETTING_LINK_SECURITY;

        if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
                settings |= MGMT_SETTING_SSP;

        if (hci_dev_test_flag(hdev, HCI_HS_ENABLED))
                settings |= MGMT_SETTING_HS;

        if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
                settings |= MGMT_SETTING_ADVERTISING;

        if (hci_dev_test_flag(hdev, HCI_SC_ENABLED))
                settings |= MGMT_SETTING_SECURE_CONN;

        if (hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS))
                settings |= MGMT_SETTING_DEBUG_KEYS;

        if (hci_dev_test_flag(hdev, HCI_PRIVACY))
                settings |= MGMT_SETTING_PRIVACY;

        /* The current setting for static address has two purposes. The
         * first is to indicate if the static address will be used and
         * the second is to indicate if it is actually set.
         *
         * This means if the static address is not configured, this flag
         * will never be set. If the address is configured, then if the
         * address is actually used decides if the flag is set or not.
         *
         * For single mode LE only controllers and dual-mode controllers
         * with BR/EDR disabled, the existence of the static address will
         * be evaluated.
         */
        if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
            !hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) ||
            !bacmp(&hdev->bdaddr, BDADDR_ANY)) {
                if (bacmp(&hdev->static_addr, BDADDR_ANY))
                        settings |= MGMT_SETTING_STATIC_ADDRESS;
        }

        return settings;
}

#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 struct mgmt_pending_cmd *pending_find(u16 opcode, struct hci_dev *hdev)
{
        return mgmt_pending_find(HCI_CHANNEL_CONTROL, opcode, hdev);
}

static struct mgmt_pending_cmd *pending_find_data(u16 opcode,
                                                  struct hci_dev *hdev,
                                                  const void *data)
{
        return mgmt_pending_find_data(HCI_CHANNEL_CONTROL, opcode, hdev, data);
}

static u8 get_current_adv_instance(struct hci_dev *hdev)
{
        /* The "Set Advertising" setting supersedes the "Add Advertising"
         * setting. Here we set the advertising data based on which
         * setting was set. When neither apply, default to the global settings,
         * represented by instance "0".
         */
        if (hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE) &&
            !hci_dev_test_flag(hdev, HCI_ADVERTISING))
                return hdev->cur_adv_instance;

        return 0x00;
}

static u8 create_default_scan_rsp_data(struct hci_dev *hdev, u8 *ptr)
{
        u8 ad_len = 0;
        size_t name_len;

        name_len = strlen(hdev->dev_name);
        if (name_len > 0) {
                size_t max_len = HCI_MAX_AD_LENGTH - ad_len - 2;

                if (name_len > max_len) {
                        name_len = max_len;
                        ptr[1] = EIR_NAME_SHORT;
                } else
                        ptr[1] = EIR_NAME_COMPLETE;

                ptr[0] = name_len + 1;

                memcpy(ptr + 2, hdev->dev_name, name_len);

                ad_len += (name_len + 2);
                ptr += (name_len + 2);
        }

        return ad_len;
}

static u8 create_instance_scan_rsp_data(struct hci_dev *hdev, u8 instance,
                                        u8 *ptr)
{
        struct adv_info *adv_instance;

        adv_instance = hci_find_adv_instance(hdev, instance);
        if (!adv_instance)
                return 0;

        /* TODO: Set the appropriate entries based on advertising instance flags
         * here once flags other than 0 are supported.
         */
        memcpy(ptr, adv_instance->scan_rsp_data,
               adv_instance->scan_rsp_len);

        return adv_instance->scan_rsp_len;
}

static void update_inst_scan_rsp_data(struct hci_request *req, u8 instance)
{
        struct hci_dev *hdev = req->hdev;
        struct hci_cp_le_set_scan_rsp_data cp;
        u8 len;

        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return;

        memset(&cp, 0, sizeof(cp));

        if (instance)
                len = create_instance_scan_rsp_data(hdev, instance, cp.data);
        else
                len = create_default_scan_rsp_data(hdev, cp.data);

        if (hdev->scan_rsp_data_len == len &&
            !memcmp(cp.data, hdev->scan_rsp_data, len))
                return;

        memcpy(hdev->scan_rsp_data, cp.data, sizeof(cp.data));
        hdev->scan_rsp_data_len = len;

        cp.length = len;

        hci_req_add(req, HCI_OP_LE_SET_SCAN_RSP_DATA, sizeof(cp), &cp);
}

static void update_scan_rsp_data(struct hci_request *req)
{
        update_inst_scan_rsp_data(req, get_current_adv_instance(req->hdev));
}

static u8 get_adv_discov_flags(struct hci_dev *hdev)
{
        struct mgmt_pending_cmd *cmd;

        /* If there's a pending mgmt command the flags will not yet have
         * their final values, so check for this first.
         */
        cmd = pending_find(MGMT_OP_SET_DISCOVERABLE, hdev);
        if (cmd) {
                struct mgmt_mode *cp = cmd->param;
                if (cp->val == 0x01)
                        return LE_AD_GENERAL;
                else if (cp->val == 0x02)
                        return LE_AD_LIMITED;
        } else {
                if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
                        return LE_AD_LIMITED;
                else if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
                        return LE_AD_GENERAL;
        }

        return 0;
}

static bool get_connectable(struct hci_dev *hdev)
{
        struct mgmt_pending_cmd *cmd;

        /* If there's a pending mgmt command the flag will not yet have
         * it's final value, so check for this first.
         */
        cmd = pending_find(MGMT_OP_SET_CONNECTABLE, hdev);
        if (cmd) {
                struct mgmt_mode *cp = cmd->param;

                return cp->val;
        }

        return hci_dev_test_flag(hdev, HCI_CONNECTABLE);
}

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;

                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 u8 get_cur_adv_instance_scan_rsp_len(struct hci_dev *hdev)
{
        u8 instance = get_current_adv_instance(hdev);
        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;
}

static u8 create_instance_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr)
{
        struct adv_info *adv_instance = NULL;
        u8 ad_len = 0, flags = 0;
        u32 instance_flags;

        /* Return 0 when the current instance identifier is invalid. */
        if (instance) {
                adv_instance = hci_find_adv_instance(hdev, instance);
                if (!adv_instance)
                        return 0;
        }

        instance_flags = get_adv_instance_flags(hdev, instance);

        /* The Add Advertising command allows userspace to set both the general
         * and limited discoverable flags.
         */
        if (instance_flags & MGMT_ADV_FLAG_DISCOV)
                flags |= LE_AD_GENERAL;

        if (instance_flags & MGMT_ADV_FLAG_LIMITED_DISCOV)
                flags |= LE_AD_LIMITED;

        if (flags || (instance_flags & MGMT_ADV_FLAG_MANAGED_FLAGS)) {
                /* If a discovery flag wasn't provided, simply use the global
                 * settings.
                 */
                if (!flags)
                        flags |= get_adv_discov_flags(hdev);

                if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                        flags |= LE_AD_NO_BREDR;

                /* If flags would still be empty, then there is no need to
                 * include the "Flags" AD field".
                 */
                if (flags) {
                        ptr[0] = 0x02;
                        ptr[1] = EIR_FLAGS;
                        ptr[2] = flags;

                        ad_len += 3;
                        ptr += 3;
                }
        }

        if (adv_instance) {
                memcpy(ptr, adv_instance->adv_data,
                       adv_instance->adv_data_len);
                ad_len += adv_instance->adv_data_len;
                ptr += adv_instance->adv_data_len;
        }

        /* Provide Tx Power only if we can provide a valid value for it */
        if (hdev->adv_tx_power != HCI_TX_POWER_INVALID &&
            (instance_flags & MGMT_ADV_FLAG_TX_POWER)) {
                ptr[0] = 0x02;
                ptr[1] = EIR_TX_POWER;
                ptr[2] = (u8)hdev->adv_tx_power;

                ad_len += 3;
                ptr += 3;
        }

        return ad_len;
}

static void update_inst_adv_data(struct hci_request *req, u8 instance)
{
        struct hci_dev *hdev = req->hdev;
        struct hci_cp_le_set_adv_data cp;
        u8 len;

        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return;

        memset(&cp, 0, sizeof(cp));

        len = create_instance_adv_data(hdev, instance, cp.data);

        /* There's nothing to do if the data hasn't changed */
        if (hdev->adv_data_len == len &&
            memcmp(cp.data, hdev->adv_data, len) == 0)
                return;

        memcpy(hdev->adv_data, cp.data, sizeof(cp.data));
        hdev->adv_data_len = len;

        cp.length = len;

        hci_req_add(req, HCI_OP_LE_SET_ADV_DATA, sizeof(cp), &cp);
}

static void update_adv_data(struct hci_request *req)
{
        update_inst_adv_data(req, get_current_adv_instance(req->hdev));
}

int mgmt_update_adv_data(struct hci_dev *hdev)
{
        struct hci_request req;

        hci_req_init(&req, hdev);
        update_adv_data(&req);

        return hci_req_run(&req, NULL);
}

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));
}

static void 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);
}

static u8 get_service_classes(struct hci_dev *hdev)
{
        struct bt_uuid *uuid;
        u8 val = 0;

        list_for_each_entry(uuid, &hdev->uuids, list)
                val |= uuid->svc_hint;

        return val;
}

static void update_class(struct hci_request *req)
{
        struct hci_dev *hdev = req->hdev;
        u8 cod[3];

        BT_DBG("%s", hdev->name);

        if (!hdev_is_powered(hdev))
                return;

        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return;

        if (hci_dev_test_flag(hdev, HCI_SERVICE_CACHE))
                return;

        cod[0] = hdev->minor_class;
        cod[1] = hdev->major_class;
        cod[2] = get_service_classes(hdev);

        if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
                cod[1] |= 0x20;

        if (memcmp(cod, hdev->dev_class, 3) == 0)
                return;

        hci_req_add(req, HCI_OP_WRITE_CLASS_OF_DEV, sizeof(cod), cod);
}

static void disable_advertising(struct hci_request *req)
{
        u8 enable = 0x00;

        hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}

static void 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;
        u8 instance;
        u32 flags;

        if (hci_conn_num(hdev, LE_LINK) > 0)
                return;

        if (hci_dev_test_flag(hdev, HCI_LE_ADV))
                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);

        instance = get_current_adv_instance(hdev);
        flags = get_adv_instance_flags(hdev, 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) ||
                      get_connectable(hdev);

        /* 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, &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);

        if (connectable)
                cp.type = LE_ADV_IND;
        else if (get_cur_adv_instance_scan_rsp_len(hdev))
                cp.type = LE_ADV_SCAN_IND;
        else
                cp.type = LE_ADV_NONCONN_IND;

        cp.own_address_type = own_addr_type;
        cp.channel_map = hdev->le_adv_channel_map;

        hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);

        hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
}

static void service_cache_off(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev,
                                            service_cache.work);
        struct hci_request req;

        if (!hci_dev_test_and_clear_flag(hdev, HCI_SERVICE_CACHE))
                return;

        hci_req_init(&req, hdev);

        hci_dev_lock(hdev);

        update_eir(&req);
        update_class(&req);

        hci_dev_unlock(hdev);

        hci_req_run(&req, NULL);
}

static void rpa_expired(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev,
                                            rpa_expired.work);
        struct hci_request req;

        BT_DBG("");

        hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);

        if (!hci_dev_test_flag(hdev, HCI_ADVERTISING))
                return;

        /* The generation of a new RPA and programming it into the
         * controller happens in the enable_advertising() function.
         */
        hci_req_init(&req, hdev);
        enable_advertising(&req);
        hci_req_run(&req, NULL);
}

static void mgmt_init_hdev(struct sock *sk, struct hci_dev *hdev)
{
        if (hci_dev_test_and_set_flag(hdev, HCI_MGMT))
                return;

        INIT_DELAYED_WORK(&hdev->service_cache, service_cache_off);
        INIT_DELAYED_WORK(&hdev->rpa_expired, rpa_expired);

        /* Non-mgmt controlled devices get this bit set
         * implicitly so that pairing works for them, however
         * for mgmt we require user-space to explicitly enable
         * it
         */
        hci_dev_clear_flag(hdev, HCI_BONDABLE);
}

static int read_controller_info(struct sock *sk, struct hci_dev *hdev,
                                void *data, u16 data_len)
{
        struct mgmt_rp_read_info rp;

        BT_DBG("sock %p %s", sk, hdev->name);

        hci_dev_lock(hdev);

        memset(&rp, 0, sizeof(rp));

        bacpy(&rp.bdaddr, &hdev->bdaddr);

        rp.version = hdev->hci_ver;
        rp.manufacturer = cpu_to_le16(hdev->manufacturer);

        rp.supported_settings = cpu_to_le32(get_supported_settings(hdev));
        rp.current_settings = cpu_to_le32(get_current_settings(hdev));

        memcpy(rp.dev_class, hdev->dev_class, 3);

        memcpy(rp.name, hdev->dev_name, sizeof(hdev->dev_name));
        memcpy(rp.short_name, hdev->short_name, sizeof(hdev->short_name));

        hci_dev_unlock(hdev);

        return mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_INFO, 0, &rp,
                                 sizeof(rp));
}

static int send_settings_rsp(struct sock *sk, u16 opcode, struct hci_dev *hdev)
{
        __le32 settings = cpu_to_le32(get_current_settings(hdev));

        return mgmt_cmd_complete(sk, hdev->id, opcode, 0, &settings,
                                 sizeof(settings));
}

static void clean_up_hci_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
        BT_DBG("%s status 0x%02x", hdev->name, status);

        if (hci_conn_count(hdev) == 0) {
                cancel_delayed_work(&hdev->power_off);
                queue_work(hdev->req_workqueue, &hdev->power_off.work);
        }
}

static bool hci_stop_discovery(struct hci_request *req)
{
        struct hci_dev *hdev = req->hdev;
        struct hci_cp_remote_name_req_cancel cp;
        struct inquiry_entry *e;

        switch (hdev->discovery.state) {
        case DISCOVERY_FINDING:
                if (test_bit(HCI_INQUIRY, &hdev->flags))
                        hci_req_add(req, HCI_OP_INQUIRY_CANCEL, 0, NULL);

                if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
                        cancel_delayed_work(&hdev->le_scan_disable);
                        hci_req_add_le_scan_disable(req);
                }

                return true;

        case DISCOVERY_RESOLVING:
                e = hci_inquiry_cache_lookup_resolve(hdev, BDADDR_ANY,
                                                     NAME_PENDING);
                if (!e)
                        break;

                bacpy(&cp.bdaddr, &e->data.bdaddr);
                hci_req_add(req, HCI_OP_REMOTE_NAME_REQ_CANCEL, sizeof(cp),
                            &cp);

                return true;

        default:
                /* Passive scanning */
                if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
                        hci_req_add_le_scan_disable(req);
                        return true;
                }

                break;
        }

        return false;
}

static void advertising_added(struct sock *sk, struct hci_dev *hdev,
                              u8 instance)
{
        struct mgmt_ev_advertising_added ev;

        ev.instance = instance;

        mgmt_event(MGMT_EV_ADVERTISING_ADDED, hdev, &ev, sizeof(ev), sk);
}

static void advertising_removed(struct sock *sk, struct hci_dev *hdev,
                                u8 instance)
{
        struct mgmt_ev_advertising_removed ev;

        ev.instance = instance;

        mgmt_event(MGMT_EV_ADVERTISING_REMOVED, hdev, &ev, sizeof(ev), sk);
}

static int schedule_adv_instance(struct hci_request *req, u8 instance,
                                 bool force) {
        struct hci_dev *hdev = req->hdev;
        struct adv_info *adv_instance = NULL;
        u16 timeout;

        if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
            !hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))
                return -EPERM;

        if (hdev->adv_instance_timeout)
                return -EBUSY;

        adv_instance = hci_find_adv_instance(hdev, instance);
        if (!adv_instance)
                return -ENOENT;

        /* A zero timeout means unlimited advertising. As long as there is
         * only one instance, duration should be ignored. We still set a timeout
         * in case further instances are being added later on.
         *
         * If the remaining lifetime of the instance is more than the duration
         * then the timeout corresponds to the duration, otherwise it will be
         * reduced to the remaining instance lifetime.
         */
        if (adv_instance->timeout == 0 ||
            adv_instance->duration <= adv_instance->remaining_time)
                timeout = adv_instance->duration;
        else
                timeout = adv_instance->remaining_time;

        /* The remaining time is being reduced unless the instance is being
         * advertised without time limit.
         */
        if (adv_instance->timeout)
                adv_instance->remaining_time =
                                adv_instance->remaining_time - timeout;

        hdev->adv_instance_timeout = timeout;
        queue_delayed_work(hdev->workqueue,
                           &hdev->adv_instance_expire,
                           msecs_to_jiffies(timeout * 1000));

        /* If we're just re-scheduling the same instance again then do not
         * execute any HCI commands. This happens when a single instance is
         * being advertised.
         */
        if (!force && hdev->cur_adv_instance == instance &&
            hci_dev_test_flag(hdev, HCI_LE_ADV))
                return 0;

        hdev->cur_adv_instance = instance;
        update_adv_data(req);
        update_scan_rsp_data(req);
        enable_advertising(req);

        return 0;
}

static void cancel_adv_timeout(struct hci_dev *hdev)
{
        if (hdev->adv_instance_timeout) {
                hdev->adv_instance_timeout = 0;
                cancel_delayed_work(&hdev->adv_instance_expire);
        }
}

/* For a single instance:
 * - force == true: The instance will be removed even when its remaining
 *   lifetime is not zero.
 * - force == false: the instance will be deactivated but kept stored unless
 *   the remaining lifetime is zero.
 *
 * For instance == 0x00:
 * - force == true: All instances will be removed regardless of their timeout
 *   setting.
 * - force == false: Only instances that have a timeout will be removed.
 */
static void clear_adv_instance(struct hci_dev *hdev, struct hci_request *req,
                               u8 instance, bool force)
{
        struct adv_info *adv_instance, *n, *next_instance = NULL;
        int err;
        u8 rem_inst;

        /* Cancel any timeout concerning the removed instance(s). */
        if (!instance || hdev->cur_adv_instance == instance)
                cancel_adv_timeout(hdev);

        /* Get the next instance to advertise BEFORE we remove
         * the current one. This can be the same instance again
         * if there is only one instance.
         */
        if (instance && hdev->cur_adv_instance == instance)
                next_instance = hci_get_next_instance(hdev, instance);

        if (instance == 0x00) {
                list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances,
                                         list) {
                        if (!(force || adv_instance->timeout))
                                continue;

                        rem_inst = adv_instance->instance;
                        err = hci_remove_adv_instance(hdev, rem_inst);
                        if (!err)
                                advertising_removed(NULL, hdev, rem_inst);
                }
                hdev->cur_adv_instance = 0x00;
        } else {
                adv_instance = hci_find_adv_instance(hdev, instance);

                if (force || (adv_instance && adv_instance->timeout &&
                              !adv_instance->remaining_time)) {
                        /* Don't advertise a removed instance. */
                        if (next_instance &&
                            next_instance->instance == instance)
                                next_instance = NULL;

                        err = hci_remove_adv_instance(hdev, instance);
                        if (!err)
                                advertising_removed(NULL, hdev, instance);
                }
        }

        if (list_empty(&hdev->adv_instances)) {
                hdev->cur_adv_instance = 0x00;
                hci_dev_clear_flag(hdev, HCI_ADVERTISING_INSTANCE);
        }

        if (!req || !hdev_is_powered(hdev) ||
            hci_dev_test_flag(hdev, HCI_ADVERTISING))
                return;

        if (next_instance)
                schedule_adv_instance(req, next_instance->instance, false);
}

static int clean_up_hci_state(struct hci_dev *hdev)
{
        struct hci_request req;
        struct hci_conn *conn;
        bool discov_stopped;
        int err;

        hci_req_init(&req, hdev);

        if (test_bit(HCI_ISCAN, &hdev->flags) ||
            test_bit(HCI_PSCAN, &hdev->flags)) {
                u8 scan = 0x00;
                hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
        }

        clear_adv_instance(hdev, NULL, 0x00, false);

        if (hci_dev_test_flag(hdev, HCI_LE_ADV))
                disable_advertising(&req);

        discov_stopped = hci_stop_discovery(&req);

        list_for_each_entry(conn, &hdev->conn_hash.list, list) {
                struct hci_cp_disconnect dc;
                struct hci_cp_reject_conn_req rej;

                switch (conn->state) {
                case BT_CONNECTED:
                case BT_CONFIG:
                        dc.handle = cpu_to_le16(conn->handle);
                        dc.reason = 0x15; /* Terminated due to Power Off */
                        hci_req_add(&req, HCI_OP_DISCONNECT, sizeof(dc), &dc);
                        break;
                case BT_CONNECT:
                        if (conn->type == LE_LINK)
                                hci_req_add(&req, HCI_OP_LE_CREATE_CONN_CANCEL,
                                            0, NULL);
                        else if (conn->type == ACL_LINK)
                                hci_req_add(&req, HCI_OP_CREATE_CONN_CANCEL,
                                            6, &conn->dst);
                        break;
                case BT_CONNECT2:
                        bacpy(&rej.bdaddr, &conn->dst);
                        rej.reason = 0x15; /* Terminated due to Power Off */
                        if (conn->type == ACL_LINK)
                                hci_req_add(&req, HCI_OP_REJECT_CONN_REQ,
                                            sizeof(rej), &rej);
                        else if (conn->type == SCO_LINK)
                                hci_req_add(&req, HCI_OP_REJECT_SYNC_CONN_REQ,
                                            sizeof(rej), &rej);
                        break;
                }
        }

        err = hci_req_run(&req, clean_up_hci_complete);
        if (!err && discov_stopped)
                hci_discovery_set_state(hdev, DISCOVERY_STOPPING);

        return err;
}

static int set_powered(struct sock *sk, struct hci_dev *hdev, void *data,
                       u16 len)
{
        struct mgmt_mode *cp = data;
        struct mgmt_pending_cmd *cmd;
        int err;

        BT_DBG("request for %s", hdev->name);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_POWERED,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (pending_find(MGMT_OP_SET_POWERED, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_POWERED,
                                      MGMT_STATUS_BUSY);
                goto failed;
        }

        if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF)) {
                cancel_delayed_work(&hdev->power_off);

                if (cp->val) {
                        mgmt_pending_add(sk, MGMT_OP_SET_POWERED, hdev,
                                         data, len);
                        err = mgmt_powered(hdev, 1);
                        goto failed;
                }
        }

        if (!!cp->val == hdev_is_powered(hdev)) {
                err = send_settings_rsp(sk, MGMT_OP_SET_POWERED, hdev);
                goto failed;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_POWERED, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto failed;
        }

        if (cp->val) {
                queue_work(hdev->req_workqueue, &hdev->power_on);
                err = 0;
        } else {
                /* Disconnect connections, stop scans, etc */
                err = clean_up_hci_state(hdev);
                if (!err)
                        queue_delayed_work(hdev->req_workqueue, &hdev->power_off,
                                           HCI_POWER_OFF_TIMEOUT);

                /* ENODATA means there were no HCI commands queued */
                if (err == -ENODATA) {
                        cancel_delayed_work(&hdev->power_off);
                        queue_work(hdev->req_workqueue, &hdev->power_off.work);
                        err = 0;
                }
        }

failed:
        hci_dev_unlock(hdev);
        return err;
}

static int new_settings(struct hci_dev *hdev, struct sock *skip)
{
        __le32 ev = cpu_to_le32(get_current_settings(hdev));

        return mgmt_generic_event(MGMT_EV_NEW_SETTINGS, hdev, &ev,
                                  sizeof(ev), skip);
}

int mgmt_new_settings(struct hci_dev *hdev)
{
        return new_settings(hdev, NULL);
}

struct cmd_lookup {
        struct sock *sk;
        struct hci_dev *hdev;
        u8 mgmt_status;
};

static void settings_rsp(struct mgmt_pending_cmd *cmd, void *data)
{
        struct cmd_lookup *match = data;

        send_settings_rsp(cmd->sk, cmd->opcode, match->hdev);

        list_del(&cmd->list);

        if (match->sk == NULL) {
                match->sk = cmd->sk;
                sock_hold(match->sk);
        }

        mgmt_pending_free(cmd);
}

static void cmd_status_rsp(struct mgmt_pending_cmd *cmd, void *data)
{
        u8 *status = data;

        mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, *status);
        mgmt_pending_remove(cmd);
}

static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)
{
        if (cmd->cmd_complete) {
                u8 *status = data;

                cmd->cmd_complete(cmd, *status);
                mgmt_pending_remove(cmd);

                return;
        }

        cmd_status_rsp(cmd, data);
}

static int generic_cmd_complete(struct mgmt_pending_cmd *cmd, u8 status)
{
        return mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status,
                                 cmd->param, cmd->param_len);
}

static int addr_cmd_complete(struct mgmt_pending_cmd *cmd, u8 status)
{
        return mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status,
                                 cmd->param, sizeof(struct mgmt_addr_info));
}

static u8 mgmt_bredr_support(struct hci_dev *hdev)
{
        if (!lmp_bredr_capable(hdev))
                return MGMT_STATUS_NOT_SUPPORTED;
        else if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return MGMT_STATUS_REJECTED;
        else
                return MGMT_STATUS_SUCCESS;
}

static u8 mgmt_le_support(struct hci_dev *hdev)
{
        if (!lmp_le_capable(hdev))
                return MGMT_STATUS_NOT_SUPPORTED;
        else if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return MGMT_STATUS_REJECTED;
        else
                return MGMT_STATUS_SUCCESS;
}

static void set_discoverable_complete(struct hci_dev *hdev, u8 status,
                                      u16 opcode)
{
        struct mgmt_pending_cmd *cmd;
        struct mgmt_mode *cp;
        struct hci_request req;
        bool changed;

        BT_DBG("status 0x%02x", status);

        hci_dev_lock(hdev);

        cmd = pending_find(MGMT_OP_SET_DISCOVERABLE, hdev);
        if (!cmd)
                goto unlock;

        if (status) {
                u8 mgmt_err = mgmt_status(status);
                mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
                hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
                goto remove_cmd;
        }

        cp = cmd->param;
        if (cp->val) {
                changed = !hci_dev_test_and_set_flag(hdev, HCI_DISCOVERABLE);

                if (hdev->discov_timeout > 0) {
                        int to = msecs_to_jiffies(hdev->discov_timeout * 1000);
                        queue_delayed_work(hdev->workqueue, &hdev->discov_off,
                                           to);
                }
        } else {
                changed = hci_dev_test_and_clear_flag(hdev, HCI_DISCOVERABLE);
        }

        send_settings_rsp(cmd->sk, MGMT_OP_SET_DISCOVERABLE, hdev);

        if (changed)
                new_settings(hdev, cmd->sk);

        /* When the discoverable mode gets changed, make sure
         * that class of device has the limited discoverable
         * bit correctly set. Also update page scan based on whitelist
         * entries.
         */
        hci_req_init(&req, hdev);
        __hci_update_page_scan(&req);
        update_class(&req);
        hci_req_run(&req, NULL);

remove_cmd:
        mgmt_pending_remove(cmd);

unlock:
        hci_dev_unlock(hdev);
}

static int set_discoverable(struct sock *sk, struct hci_dev *hdev, void *data,
                            u16 len)
{
        struct mgmt_cp_set_discoverable *cp = data;
        struct mgmt_pending_cmd *cmd;
        struct hci_request req;
        u16 timeout;
        u8 scan;
        int err;

        BT_DBG("request for %s", hdev->name);

        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
            !hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE,
                                       MGMT_STATUS_REJECTED);

        if (cp->val != 0x00 && cp->val != 0x01 && cp->val != 0x02)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE,
                                       MGMT_STATUS_INVALID_PARAMS);

        timeout = __le16_to_cpu(cp->timeout);

        /* Disabling discoverable requires that no timeout is set,
         * and enabling limited discoverable requires a timeout.
         */
        if ((cp->val == 0x00 && timeout > 0) ||
            (cp->val == 0x02 && timeout == 0))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (!hdev_is_powered(hdev) && timeout > 0) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE,
                                      MGMT_STATUS_NOT_POWERED);
                goto failed;
        }

        if (pending_find(MGMT_OP_SET_DISCOVERABLE, hdev) ||
            pending_find(MGMT_OP_SET_CONNECTABLE, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE,
                                      MGMT_STATUS_BUSY);
                goto failed;
        }

        if (!hci_dev_test_flag(hdev, HCI_CONNECTABLE)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DISCOVERABLE,
                                      MGMT_STATUS_REJECTED);
                goto failed;
        }

        if (!hdev_is_powered(hdev)) {
                bool changed = false;

                /* Setting limited discoverable when powered off is
                 * not a valid operation since it requires a timeout
                 * and so no need to check HCI_LIMITED_DISCOVERABLE.
                 */
                if (!!cp->val != hci_dev_test_flag(hdev, HCI_DISCOVERABLE)) {
                        hci_dev_change_flag(hdev, HCI_DISCOVERABLE);
                        changed = true;
                }

                err = send_settings_rsp(sk, MGMT_OP_SET_DISCOVERABLE, hdev);
                if (err < 0)
                        goto failed;

                if (changed)
                        err = new_settings(hdev, sk);

                goto failed;
        }

        /* If the current mode is the same, then just update the timeout
         * value with the new value. And if only the timeout gets updated,
         * then no need for any HCI transactions.
         */
        if (!!cp->val == hci_dev_test_flag(hdev, HCI_DISCOVERABLE) &&
            (cp->val == 0x02) == hci_dev_test_flag(hdev,
                                                   HCI_LIMITED_DISCOVERABLE)) {
                cancel_delayed_work(&hdev->discov_off);
                hdev->discov_timeout = timeout;

                if (cp->val && hdev->discov_timeout > 0) {
                        int to = msecs_to_jiffies(hdev->discov_timeout * 1000);
                        queue_delayed_work(hdev->workqueue, &hdev->discov_off,
                                           to);
                }

                err = send_settings_rsp(sk, MGMT_OP_SET_DISCOVERABLE, hdev);
                goto failed;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_DISCOVERABLE, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto failed;
        }

        /* Cancel any potential discoverable timeout that might be
         * still active and store new timeout value. The arming of
         * the timeout happens in the complete handler.
         */
        cancel_delayed_work(&hdev->discov_off);
        hdev->discov_timeout = timeout;

        /* Limited discoverable mode */
        if (cp->val == 0x02)
                hci_dev_set_flag(hdev, HCI_LIMITED_DISCOVERABLE);
        else
                hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);

        hci_req_init(&req, hdev);

        /* The procedure for LE-only controllers is much simpler - just

         * update the advertising data.
         */
        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                goto update_ad;

        scan = SCAN_PAGE;

        if (cp->val) {
                struct hci_cp_write_current_iac_lap hci_cp;

                if (cp->val == 0x02) {
                        /* Limited discoverable mode */
                        hci_cp.num_iac = min_t(u8, hdev->num_iac, 2);
                        hci_cp.iac_lap[0] = 0x00;       /* LIAC */
                        hci_cp.iac_lap[1] = 0x8b;
                        hci_cp.iac_lap[2] = 0x9e;
                        hci_cp.iac_lap[3] = 0x33;       /* GIAC */
                        hci_cp.iac_lap[4] = 0x8b;
                        hci_cp.iac_lap[5] = 0x9e;
                } else {
                        /* General discoverable mode */
                        hci_cp.num_iac = 1;
                        hci_cp.iac_lap[0] = 0x33;       /* GIAC */
                        hci_cp.iac_lap[1] = 0x8b;
                        hci_cp.iac_lap[2] = 0x9e;
                }

                hci_req_add(&req, HCI_OP_WRITE_CURRENT_IAC_LAP,
                            (hci_cp.num_iac * 3) + 1, &hci_cp);

                scan |= SCAN_INQUIRY;
        } else {
                hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
        }

        hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, sizeof(scan), &scan);

update_ad:
        update_adv_data(&req);

        err = hci_req_run(&req, set_discoverable_complete);
        if (err < 0)
                mgmt_pending_remove(cmd);

failed:
        hci_dev_unlock(hdev);
        return err;
}

static void 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);
}

static void set_connectable_complete(struct hci_dev *hdev, u8 status,
                                     u16 opcode)
{
        struct mgmt_pending_cmd *cmd;
        struct mgmt_mode *cp;
        bool conn_changed, discov_changed;

        BT_DBG("status 0x%02x", status);

        hci_dev_lock(hdev);

        cmd = pending_find(MGMT_OP_SET_CONNECTABLE, hdev);
        if (!cmd)
                goto unlock;

        if (status) {
                u8 mgmt_err = mgmt_status(status);
                mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
                goto remove_cmd;
        }

        cp = cmd->param;
        if (cp->val) {
                conn_changed = !hci_dev_test_and_set_flag(hdev,
                                                          HCI_CONNECTABLE);
                discov_changed = false;
        } else {
                conn_changed = hci_dev_test_and_clear_flag(hdev,
                                                           HCI_CONNECTABLE);
                discov_changed = hci_dev_test_and_clear_flag(hdev,
                                                             HCI_DISCOVERABLE);
        }

        send_settings_rsp(cmd->sk, MGMT_OP_SET_CONNECTABLE, hdev);

        if (conn_changed || discov_changed) {
                new_settings(hdev, cmd->sk);
                hci_update_page_scan(hdev);
                if (discov_changed)
                        mgmt_update_adv_data(hdev);
                hci_update_background_scan(hdev);
        }

remove_cmd:
        mgmt_pending_remove(cmd);

unlock:
        hci_dev_unlock(hdev);
}

static int set_connectable_update_settings(struct hci_dev *hdev,
                                           struct sock *sk, u8 val)
{
        bool changed = false;
        int err;

        if (!!val != hci_dev_test_flag(hdev, HCI_CONNECTABLE))
                changed = true;

        if (val) {
                hci_dev_set_flag(hdev, HCI_CONNECTABLE);
        } else {
                hci_dev_clear_flag(hdev, HCI_CONNECTABLE);
                hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
        }

        err = send_settings_rsp(sk, MGMT_OP_SET_CONNECTABLE, hdev);
        if (err < 0)
                return err;

        if (changed) {
                hci_update_page_scan(hdev);
                hci_update_background_scan(hdev);
                return new_settings(hdev, sk);
        }

        return 0;
}

static int set_connectable(struct sock *sk, struct hci_dev *hdev, void *data,
                           u16 len)
{
        struct mgmt_mode *cp = data;
        struct mgmt_pending_cmd *cmd;
        struct hci_request req;
        u8 scan;
        int err;

        BT_DBG("request for %s", hdev->name);

        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
            !hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_CONNECTABLE,
                                       MGMT_STATUS_REJECTED);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_CONNECTABLE,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (!hdev_is_powered(hdev)) {
                err = set_connectable_update_settings(hdev, sk, cp->val);
                goto failed;
        }

        if (pending_find(MGMT_OP_SET_DISCOVERABLE, hdev) ||
            pending_find(MGMT_OP_SET_CONNECTABLE, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_CONNECTABLE,
                                      MGMT_STATUS_BUSY);
                goto failed;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_CONNECTABLE, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto failed;
        }

        hci_req_init(&req, hdev);

        /* If BR/EDR is not enabled and we disable advertising as a
         * by-product of disabling connectable, we need to update the
         * advertising flags.
         */
        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
                if (!cp->val) {
                        hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
                        hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
                }
                update_adv_data(&req);
        } else if (cp->val != test_bit(HCI_PSCAN, &hdev->flags)) {
                if (cp->val) {
                        scan = SCAN_PAGE;
                } else {
                        /* If we don't have any whitelist entries just
                         * disable all scanning. If there are entries
                         * and we had both page and inquiry scanning
                         * enabled then fall back to only page scanning.
                         * Otherwise no changes are needed.
                         */
                        if (list_empty(&hdev->whitelist))
                                scan = SCAN_DISABLED;
                        else if (test_bit(HCI_ISCAN, &hdev->flags))
                                scan = SCAN_PAGE;
                        else
                                goto no_scan_update;

                        if (test_bit(HCI_ISCAN, &hdev->flags) &&
                            hdev->discov_timeout > 0)
                                cancel_delayed_work(&hdev->discov_off);
                }

                hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
        }

no_scan_update:
        /* Update the advertising parameters if necessary */
        if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
            hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))
                enable_advertising(&req);

        err = hci_req_run(&req, set_connectable_complete);
        if (err < 0) {
                mgmt_pending_remove(cmd);
                if (err == -ENODATA)
                        err = set_connectable_update_settings(hdev, sk,
                                                              cp->val);
                goto failed;
        }

failed:
        hci_dev_unlock(hdev);
        return err;
}

static int set_bondable(struct sock *sk, struct hci_dev *hdev, void *data,
                        u16 len)
{
        struct mgmt_mode *cp = data;
        bool changed;
        int err;

        BT_DBG("request for %s", hdev->name);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_BONDABLE,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (cp->val)
                changed = !hci_dev_test_and_set_flag(hdev, HCI_BONDABLE);
        else
                changed = hci_dev_test_and_clear_flag(hdev, HCI_BONDABLE);

        err = send_settings_rsp(sk, MGMT_OP_SET_BONDABLE, hdev);
        if (err < 0)
                goto unlock;

        if (changed)
                err = new_settings(hdev, sk);

unlock:
        hci_dev_unlock(hdev);
        return err;
}

static int set_link_security(struct sock *sk, struct hci_dev *hdev, void *data,
                             u16 len)
{
        struct mgmt_mode *cp = data;
        struct mgmt_pending_cmd *cmd;
        u8 val, status;
        int err;

        BT_DBG("request for %s", hdev->name);

        status = mgmt_bredr_support(hdev);
        if (status)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LINK_SECURITY,
                                       status);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LINK_SECURITY,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (!hdev_is_powered(hdev)) {
                bool changed = false;

                if (!!cp->val != hci_dev_test_flag(hdev, HCI_LINK_SECURITY)) {
                        hci_dev_change_flag(hdev, HCI_LINK_SECURITY);
                        changed = true;
                }

                err = send_settings_rsp(sk, MGMT_OP_SET_LINK_SECURITY, hdev);
                if (err < 0)
                        goto failed;

                if (changed)
                        err = new_settings(hdev, sk);

                goto failed;
        }

        if (pending_find(MGMT_OP_SET_LINK_SECURITY, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LINK_SECURITY,
                                      MGMT_STATUS_BUSY);
                goto failed;
        }

        val = !!cp->val;

        if (test_bit(HCI_AUTH, &hdev->flags) == val) {
                err = send_settings_rsp(sk, MGMT_OP_SET_LINK_SECURITY, hdev);
                goto failed;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_LINK_SECURITY, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto failed;
        }

        err = hci_send_cmd(hdev, HCI_OP_WRITE_AUTH_ENABLE, sizeof(val), &val);
        if (err < 0) {
                mgmt_pending_remove(cmd);
                goto failed;
        }

failed:
        hci_dev_unlock(hdev);
        return err;
}

static int set_ssp(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
{
        struct mgmt_mode *cp = data;
        struct mgmt_pending_cmd *cmd;
        u8 status;
        int err;

        BT_DBG("request for %s", hdev->name);

        status = mgmt_bredr_support(hdev);
        if (status)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_SSP, status);

        if (!lmp_ssp_capable(hdev))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_SSP,
                                       MGMT_STATUS_NOT_SUPPORTED);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_SSP,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (!hdev_is_powered(hdev)) {
                bool changed;

                if (cp->val) {
                        changed = !hci_dev_test_and_set_flag(hdev,
                                                             HCI_SSP_ENABLED);
                } else {
                        changed = hci_dev_test_and_clear_flag(hdev,
                                                              HCI_SSP_ENABLED);
                        if (!changed)
                                changed = hci_dev_test_and_clear_flag(hdev,
                                                                      HCI_HS_ENABLED);
                        else
                                hci_dev_clear_flag(hdev, HCI_HS_ENABLED);
                }

                err = send_settings_rsp(sk, MGMT_OP_SET_SSP, hdev);
                if (err < 0)
                        goto failed;

                if (changed)
                        err = new_settings(hdev, sk);

                goto failed;
        }

        if (pending_find(MGMT_OP_SET_SSP, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_SSP,
                                      MGMT_STATUS_BUSY);
                goto failed;
        }

        if (!!cp->val == hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
                err = send_settings_rsp(sk, MGMT_OP_SET_SSP, hdev);
                goto failed;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_SSP, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto failed;
        }

        if (!cp->val && hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS))
                hci_send_cmd(hdev, HCI_OP_WRITE_SSP_DEBUG_MODE,
                             sizeof(cp->val), &cp->val);

        err = hci_send_cmd(hdev, HCI_OP_WRITE_SSP_MODE, 1, &cp->val);
        if (err < 0) {
                mgmt_pending_remove(cmd);
                goto failed;
        }

failed:
        hci_dev_unlock(hdev);
        return err;
}

static int set_hs(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
{
        struct mgmt_mode *cp = data;
        bool changed;
        u8 status;
        int err;

        BT_DBG("request for %s", hdev->name);

        status = mgmt_bredr_support(hdev);
        if (status)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_HS, status);

        if (!lmp_ssp_capable(hdev))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_HS,
                                       MGMT_STATUS_NOT_SUPPORTED);

        if (!hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_HS,
                                       MGMT_STATUS_REJECTED);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_HS,
                                       MGMT_STATUS_INVALID_PARAMS);

        hci_dev_lock(hdev);

        if (pending_find(MGMT_OP_SET_SSP, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_HS,
                                      MGMT_STATUS_BUSY);
                goto unlock;
        }

        if (cp->val) {
                changed = !hci_dev_test_and_set_flag(hdev, HCI_HS_ENABLED);
        } else {
                if (hdev_is_powered(hdev)) {
                        err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_HS,
                                              MGMT_STATUS_REJECTED);
                        goto unlock;
                }

                changed = hci_dev_test_and_clear_flag(hdev, HCI_HS_ENABLED);
        }

        err = send_settings_rsp(sk, MGMT_OP_SET_HS, hdev);
        if (err < 0)
                goto unlock;

        if (changed)
                err = new_settings(hdev, sk);

unlock:
        hci_dev_unlock(hdev);
        return err;
}

static void le_enable_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
        struct cmd_lookup match = { NULL, hdev };

        hci_dev_lock(hdev);

        if (status) {
                u8 mgmt_err = mgmt_status(status);

                mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, cmd_status_rsp,
                                     &mgmt_err);
                goto unlock;
        }

        mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, settings_rsp, &match);

        new_settings(hdev, match.sk);

        if (match.sk)
                sock_put(match.sk);

        /* Make sure the controller has a good default for
         * advertising data. Restrict the update to when LE
         * has actually been enabled. During power on, the
         * update in powered_update_hci will take care of it.
         */
        if (hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
                struct hci_request req;

                hci_req_init(&req, hdev);
                update_adv_data(&req);
                update_scan_rsp_data(&req);
                __hci_update_background_scan(&req);
                hci_req_run(&req, NULL);
        }

unlock:
        hci_dev_unlock(hdev);
}

static int set_le(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
{
        struct mgmt_mode *cp = data;
        struct hci_cp_write_le_host_supported hci_cp;
        struct mgmt_pending_cmd *cmd;
        struct hci_request req;
        int err;
        u8 val, enabled;

        BT_DBG("request for %s", hdev->name);

        if (!lmp_le_capable(hdev))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LE,
                                       MGMT_STATUS_NOT_SUPPORTED);

        if (cp->val != 0x00 && cp->val != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LE,
                                       MGMT_STATUS_INVALID_PARAMS);

        /* Bluetooth single mode LE only controllers or dual-mode
         * controllers configured as LE only devices, do not allow
         * switching LE off. These have either LE enabled explicitly
         * or BR/EDR has been previously switched off.
         *
         * When trying to enable an already enabled LE, then gracefully
         * send a positive response. Trying to disable it however will
         * result into rejection.
         */
        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
                if (cp->val == 0x01)
                        return send_settings_rsp(sk, MGMT_OP_SET_LE, hdev);

                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LE,
                                       MGMT_STATUS_REJECTED);
        }

        hci_dev_lock(hdev);

        val = !!cp->val;
        enabled = lmp_host_le_capable(hdev);

        if (!val)
                clear_adv_instance(hdev, NULL, 0x00, true);

        if (!hdev_is_powered(hdev) || val == enabled) {
                bool changed = false;

                if (val != hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
                        hci_dev_change_flag(hdev, HCI_LE_ENABLED);
                        changed = true;
                }

                if (!val && hci_dev_test_flag(hdev, HCI_ADVERTISING)) {
                        hci_dev_clear_flag(hdev, HCI_ADVERTISING);
                        changed = true;
                }

                err = send_settings_rsp(sk, MGMT_OP_SET_LE, hdev);
                if (err < 0)
                        goto unlock;

                if (changed)
                        err = new_settings(hdev, sk);

                goto unlock;
        }

        if (pending_find(MGMT_OP_SET_LE, hdev) ||
            pending_find(MGMT_OP_SET_ADVERTISING, hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_LE,
                                      MGMT_STATUS_BUSY);
                goto unlock;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_LE, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto unlock;
        }

        hci_req_init(&req, hdev);

        memset(&hci_cp, 0, sizeof(hci_cp));

        if (val) {
                hci_cp.le = val;
                hci_cp.simul = 0x00;
        } else {
                if (hci_dev_test_flag(hdev, HCI_LE_ADV))
                        disable_advertising(&req);
        }

        hci_req_add(&req, HCI_OP_WRITE_LE_HOST_SUPPORTED, sizeof(hci_cp),
                    &hci_cp);

        err = hci_req_run(&req, le_enable_complete);
        if (err < 0)
                mgmt_pending_remove(cmd);

unlock:
        hci_dev_unlock(hdev);
        return err;
}

/* This is a helper function to test for pending mgmt commands that can
 * cause CoD or EIR HCI commands. We can only allow one such pending
 * mgmt command at a time since otherwise we cannot easily track what
 * the current values are, will be, and based on that calculate if a new
 * HCI command needs to be sent and if yes with what value.
 */
static bool pending_eir_or_class(struct hci_dev *hdev)
{
        struct mgmt_pending_cmd *cmd;

        list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
                switch (cmd->opcode) {
                case MGMT_OP_ADD_UUID:
                case MGMT_OP_REMOVE_UUID:
                case MGMT_OP_SET_DEV_CLASS:
                case MGMT_OP_SET_POWERED:
                        return true;
                }
        }

        return false;
}

static const u8 bluetooth_base_uuid[] = {
                        0xfb, 0x34, 0x9b, 0x5f, 0x80, 0x00, 0x00, 0x80,
                        0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

static u8 get_uuid_size(const u8 *uuid)
{
        u32 val;

        if (memcmp(uuid, bluetooth_base_uuid, 12))
                return 128;

        val = get_unaligned_le32(&uuid[12]);
        if (val > 0xffff)
                return 32;

        return 16;
}

static void mgmt_class_complete(struct hci_dev *hdev, u16 mgmt_op, u8 status)
{
        struct mgmt_pending_cmd *cmd;

        hci_dev_lock(hdev);

        cmd = pending_find(mgmt_op, hdev);
        if (!cmd)
                goto unlock;

        mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
                          mgmt_status(status), hdev->dev_class, 3);

        mgmt_pending_remove(cmd);

unlock:
        hci_dev_unlock(hdev);
}

static void add_uuid_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
        BT_DBG("status 0x%02x", status);

        mgmt_class_complete(hdev, MGMT_OP_ADD_UUID, status);
}

static int add_uuid(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
{
        struct mgmt_cp_add_uuid *cp = data;
        struct mgmt_pending_cmd *cmd;
        struct hci_request req;
        struct bt_uuid *uuid;
        int err;

        BT_DBG("request for %s", hdev->name);

        hci_dev_lock(hdev);

        if (pending_eir_or_class(hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_UUID,
                                      MGMT_STATUS_BUSY);
                goto failed;
        }

        uuid = kmalloc(sizeof(*uuid), GFP_KERNEL);
        if (!uuid) {
                err = -ENOMEM;
                goto failed;
        }

        memcpy(uuid->uuid, cp->uuid, 16);
        uuid->svc_hint = cp->svc_hint;
        uuid->size = get_uuid_size(cp->uuid);

        list_add_tail(&uuid->list, &hdev->uuids);

        hci_req_init(&req, hdev);

        update_class(&req);
        update_eir(&req);

        err = hci_req_run(&req, add_uuid_complete);
        if (err < 0) {
                if (err != -ENODATA)
                        goto failed;

                err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_ADD_UUID, 0,
                                        hdev->dev_class, 3);
                goto failed;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_ADD_UUID, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto failed;
        }

        err = 0;

failed:
        hci_dev_unlock(hdev);
        return err;
}

static bool enable_service_cache(struct hci_dev *hdev)
{
        if (!hdev_is_powered(hdev))
                return false;

        if (!hci_dev_test_and_set_flag(hdev, HCI_SERVICE_CACHE)) {
                queue_delayed_work(hdev->workqueue, &hdev->service_cache,
                                   CACHE_TIMEOUT);
                return true;
        }

        return false;
}

static void remove_uuid_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
        BT_DBG("status 0x%02x", status);

        mgmt_class_complete(hdev, MGMT_OP_REMOVE_UUID, status);
}

static int remove_uuid(struct sock *sk, struct hci_dev *hdev, void *data,
                       u16 len)
{
        struct mgmt_cp_remove_uuid *cp = data;
        struct mgmt_pending_cmd *cmd;
        struct bt_uuid *match, *tmp;
        u8 bt_uuid_any[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
        struct hci_request req;
        int err, found;

        BT_DBG("request for %s", hdev->name);

        hci_dev_lock(hdev);

        if (pending_eir_or_class(hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_REMOVE_UUID,
                                      MGMT_STATUS_BUSY);
                goto unlock;
        }

        if (memcmp(cp->uuid, bt_uuid_any, 16) == 0) {
                hci_uuids_clear(hdev);

                if (enable_service_cache(hdev)) {
                        err = mgmt_cmd_complete(sk, hdev->id,
                                                MGMT_OP_REMOVE_UUID,
                                                0, hdev->dev_class, 3);
                        goto unlock;
                }

                goto update_class;
        }

        found = 0;

        list_for_each_entry_safe(match, tmp, &hdev->uuids, list) {
                if (memcmp(match->uuid, cp->uuid, 16) != 0)
                        continue;

                list_del(&match->list);
                kfree(match);
                found++;
        }

        if (found == 0) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_REMOVE_UUID,
                                      MGMT_STATUS_INVALID_PARAMS);
                goto unlock;
        }

update_class:
        hci_req_init(&req, hdev);

        update_class(&req);
        update_eir(&req);

        err = hci_req_run(&req, remove_uuid_complete);
        if (err < 0) {
                if (err != -ENODATA)
                        goto unlock;

                err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_REMOVE_UUID, 0,
                                        hdev->dev_class, 3);
                goto unlock;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_REMOVE_UUID, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto unlock;
        }

        err = 0;

unlock:
        hci_dev_unlock(hdev);
        return err;
}

static void set_class_complete(struct hci_dev *hdev, u8 status, u16 opcode)
{
        BT_DBG("status 0x%02x", status);

        mgmt_class_complete(hdev, MGMT_OP_SET_DEV_CLASS, status);
}

static int set_dev_class(struct sock *sk, struct hci_dev *hdev, void *data,
                         u16 len)
{
        struct mgmt_cp_set_dev_class *cp = data;
        struct mgmt_pending_cmd *cmd;
        struct hci_request req;
        int err;

        BT_DBG("request for %s", hdev->name);

        if (!lmp_bredr_capable(hdev))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DEV_CLASS,
                                       MGMT_STATUS_NOT_SUPPORTED);

        hci_dev_lock(hdev);

        if (pending_eir_or_class(hdev)) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DEV_CLASS,
                                      MGMT_STATUS_BUSY);
                goto unlock;
        }

        if ((cp->minor & 0x03) != 0 || (cp->major & 0xe0) != 0) {
                err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_SET_DEV_CLASS,
                                      MGMT_STATUS_INVALID_PARAMS);
                goto unlock;
        }

        hdev->major_class = cp->major;
        hdev->minor_class = cp->minor;

        if (!hdev_is_powered(hdev)) {
                err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_SET_DEV_CLASS, 0,
                                        hdev->dev_class, 3);
                goto unlock;
        }

        hci_req_init(&req, hdev);

        if (hci_dev_test_and_clear_flag(hdev, HCI_SERVICE_CACHE)) {
                hci_dev_unlock(hdev);
                cancel_delayed_work_sync(&hdev->service_cache);
                hci_dev_lock(hdev);
                update_eir(&req);
        }

        update_class(&req);

        err = hci_req_run(&req, set_class_complete);
        if (err < 0) {
                if (err != -ENODATA)
                        goto unlock;

                err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_SET_DEV_CLASS, 0,
                                        hdev->dev_class, 3);
                goto unlock;
        }

        cmd = mgmt_pending_add(sk, MGMT_OP_SET_DEV_CLASS, hdev, data, len);
        if (!cmd) {
                err = -ENOMEM;
                goto unlock;
        }

        err = 0;

unlock:
        hci_dev_unlock(hdev);
        return err;
}

static int load_link_keys(struct sock *sk, struct hci_dev *hdev, void *data,
                          u16 len)
{
        struct mgmt_cp_load_link_keys *cp = data;
        const u16 max_key_count = ((U16_MAX - sizeof(*cp)) /
                                   sizeof(struct mgmt_link_key_info));
        u16 key_count, expected_len;
        bool changed;
        int i;

        BT_DBG("request for %s", hdev->name);

        if (!lmp_bredr_capable(hdev))
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_LOAD_LINK_KEYS,
                                       MGMT_STATUS_NOT_SUPPORTED);

        key_count = __le16_to_cpu(cp->key_count);
        if (key_count > max_key_count) {
                BT_ERR("load_link_keys: too big key_count value %u",
                       key_count);
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_LOAD_LINK_KEYS,
                                       MGMT_STATUS_INVALID_PARAMS);
        }

        expected_len = sizeof(*cp) + key_count *
                                        sizeof(struct mgmt_link_key_info);
        if (expected_len != len) {
                BT_ERR("load_link_keys: expected %u bytes, got %u bytes",
                       expected_len, len);
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_LOAD_LINK_KEYS,
                                       MGMT_STATUS_INVALID_PARAMS);
        }

        if (cp->debug_keys != 0x00 && cp->debug_keys != 0x01)
                return mgmt_cmd_status(sk, hdev->id, MGMT_OP_LOAD_LINK_KEYS,
                                       MGMT_STATUS_INVALID_PARAMS);

        BT_DBG("%s debug_keys %u key_count %u", hdev->name, cp->debug_keys,
               key_count);

        for (i = 0; i < key_count; i++) {
                struct mgmt_link_key_info *key = &cp->keys[i];

                if (key->addr.type != BDADDR_BREDR || key->type > 0x08)
                        return mgmt_cmd_status(sk, hdev->id,
                                               MGMT_OP_LOAD_LINK_KEYS,
                                               MGMT_STATUS_INVALID_PARAMS);
        }

        hci_dev_lock(hdev);

        hci_link_keys_clear(hdev);