esp-idf/components/bt/bluedroid/stack/btm/btm_dev.c

/******************************************************************************
 *
 *  Copyright (C) 1999-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This file contains functions for the Bluetooth Device Manager
 *
 ******************************************************************************/

#include <stdlib.h>
#include <string.h>
//#include <stdio.h>
#include <stddef.h>

#include "bt_types.h"
#include "controller.h"
#include "hcimsgs.h"
#include "btu.h"
#include "btm_api.h"
#include "btm_int.h"
#include "hcidefs.h"
#include "l2c_api.h"

static tBTM_SEC_DEV_REC *btm_find_oldest_dev (void);

/*******************************************************************************
**
** Function         BTM_SecAddDevice
**
** Description      Add/modify device.  This function will be normally called
**                  during host startup to restore all required information
**                  stored in the NVRAM.
**
** Parameters:      bd_addr          - BD address of the peer
**                  dev_class        - Device Class
**                  bd_name          - Name of the peer device.  NULL if unknown.
**                  features         - Remote device's features (up to 3 pages). NULL if not known
**                  trusted_mask     - Bitwise OR of services that do not
**                                     require authorization. (array of UINT32)
**                  link_key         - Connection link key. NULL if unknown.
**
** Returns          TRUE if added OK, else FALSE
**
*******************************************************************************/
BOOLEAN BTM_SecAddDevice (BD_ADDR bd_addr, DEV_CLASS dev_class, BD_NAME bd_name,
                          UINT8 *features, UINT32 trusted_mask[],
                          LINK_KEY link_key, UINT8 key_type, tBTM_IO_CAP io_cap,
                          UINT8 pin_length)
{
#if (SMP_INCLUDED == TRUE)
    tBTM_SEC_DEV_REC  *p_dev_rec;
    int               i, j;
    BOOLEAN           found = FALSE;

    BTM_TRACE_API("%s, link key type:%x\n", __FUNCTION__, key_type);
    p_dev_rec = btm_find_dev (bd_addr);
    if (!p_dev_rec) {
        /* There is no device record, allocate one.
         * If we can not find an empty spot for this one, let it fail. */
        for (i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++) {
            if (!(btm_cb.sec_dev_rec[i].sec_flags & BTM_SEC_IN_USE)) {
                p_dev_rec = &btm_cb.sec_dev_rec[i];

                /* Mark this record as in use and initialize */
                memset (p_dev_rec, 0, sizeof (tBTM_SEC_DEV_REC));
                p_dev_rec->sec_flags = BTM_SEC_IN_USE;
                memcpy (p_dev_rec->bd_addr, bd_addr, BD_ADDR_LEN);
                p_dev_rec->hci_handle = BTM_GetHCIConnHandle (bd_addr, BT_TRANSPORT_BR_EDR);

#if BLE_INCLUDED == TRUE
                /* use default value for background connection params */
                /* update conn params, use default value for background connection params */
                memset(&p_dev_rec->conn_params, 0xff, sizeof(tBTM_LE_CONN_PRAMS));
#endif
                break;
            }
        }

        if (!p_dev_rec) {
            return (FALSE);
        }
    }

    p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;           /* Default value */
    p_dev_rec->timestamp = btm_cb.dev_rec_count++;

    if (dev_class) {
        memcpy (p_dev_rec->dev_class, dev_class, DEV_CLASS_LEN);
    }

    memset(p_dev_rec->sec_bd_name, 0, sizeof(tBTM_BD_NAME));

    if (bd_name && bd_name[0]) {
        p_dev_rec->sec_flags |= BTM_SEC_NAME_KNOWN;
        BCM_STRNCPY_S ((char *)p_dev_rec->sec_bd_name, sizeof (p_dev_rec->sec_bd_name),
                       (char *)bd_name, BTM_MAX_REM_BD_NAME_LEN);
    }

    p_dev_rec->num_read_pages = 0;
    if (features) {
        memcpy (p_dev_rec->features, features, sizeof (p_dev_rec->features));
        for (i = HCI_EXT_FEATURES_PAGE_MAX; i >= 0; i--) {
            for (j = 0; j < HCI_FEATURE_BYTES_PER_PAGE; j++) {
                if (p_dev_rec->features[i][j] != 0) {
                    found = TRUE;
                    break;
                }
            }
            if (found) {
                p_dev_rec->num_read_pages = i + 1;
                break;
            }
        }
    } else {
        memset (p_dev_rec->features, 0, sizeof (p_dev_rec->features));
    }

    BTM_SEC_COPY_TRUSTED_DEVICE(trusted_mask, p_dev_rec->trusted_mask);

    if (link_key) {
        BTM_TRACE_EVENT ("BTM_SecAddDevice()  BDA: %02x:%02x:%02x:%02x:%02x:%02x\n",
                         bd_addr[0], bd_addr[1], bd_addr[2],
                         bd_addr[3], bd_addr[4], bd_addr[5]);
        p_dev_rec->sec_flags |= BTM_SEC_LINK_KEY_KNOWN;
        memcpy (p_dev_rec->link_key, link_key, LINK_KEY_LEN);
        p_dev_rec->link_key_type = key_type;
        p_dev_rec->pin_code_length = pin_length;

        if (pin_length >= 16 ||
                key_type == BTM_LKEY_TYPE_AUTH_COMB ||
                key_type == BTM_LKEY_TYPE_AUTH_COMB_P_256) {
            // Set the fiag if the link key was made by using either a 16 digit
            // pin or MITM.
            p_dev_rec->sec_flags |= BTM_SEC_16_DIGIT_PIN_AUTHED;
        }
    }

#if defined(BTIF_MIXED_MODE_INCLUDED) && (BTIF_MIXED_MODE_INCLUDED == TRUE)
    if (key_type  < BTM_MAX_PRE_SM4_LKEY_TYPE) {
        p_dev_rec->sm4 = BTM_SM4_KNOWN;
    } else {
        p_dev_rec->sm4 = BTM_SM4_TRUE;
    }
#endif

    p_dev_rec->rmt_io_caps = io_cap;
    p_dev_rec->device_type |= BT_DEVICE_TYPE_BREDR;
#endif  ///SMP_INCLUDED == TRUE
    return (TRUE);
}


/*******************************************************************************
**
** Function         BTM_SecDeleteDevice
**
** Description      Free resources associated with the device.
**
** Parameters:      bd_addr          - BD address of the peer
**
** Returns          TRUE if removed OK, FALSE if not found or ACL link is active
**
*******************************************************************************/
BOOLEAN BTM_SecDeleteDevice (BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC *p_dev_rec;

    if (BTM_IsAclConnectionUp(bd_addr, BT_TRANSPORT_LE) ||
            BTM_IsAclConnectionUp(bd_addr, BT_TRANSPORT_BR_EDR)) {
        BTM_TRACE_WARNING("%s FAILED: Cannot Delete when connection is active\n", __func__);
        return FALSE;
    }

    if ((p_dev_rec = btm_find_dev(bd_addr)) != NULL) {
        btm_sec_free_dev(p_dev_rec);
        /* Tell controller to get rid of the link key, if it has one stored */
        BTM_DeleteStoredLinkKey (p_dev_rec->bd_addr, NULL);
    }

    return TRUE;
}

/*******************************************************************************
**
** Function         BTM_SecClearSecurityFlags
**
** Description      Reset the security flags (mark as not-paired) for a given
**                  remove device.
**
*******************************************************************************/
extern void BTM_SecClearSecurityFlags (BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC *p_dev_rec = btm_find_dev(bd_addr);
    if (p_dev_rec == NULL)
        return;

    p_dev_rec->sec_flags = 0;
    p_dev_rec->sec_state = BTM_SEC_STATE_IDLE;
    p_dev_rec->sm4 = BTM_SM4_UNKNOWN;
}


/*******************************************************************************
**
** Function         BTM_SecReadDevName
**
** Description      Looks for the device name in the security database for the
**                  specified BD address.
**
** Returns          Pointer to the name or NULL
**
*******************************************************************************/
char *BTM_SecReadDevName (BD_ADDR bd_addr)
{
    char *p_name = NULL;
    tBTM_SEC_DEV_REC *p_srec;

    if ((p_srec = btm_find_dev(bd_addr)) != NULL) {
        p_name = (char *)p_srec->sec_bd_name;
    }

    return (p_name);
}

/*******************************************************************************
**
** Function         btm_sec_alloc_dev
**
** Description      Look for the record in the device database for the record
**                  with specified address
**
** Returns          Pointer to the record or NULL
**
*******************************************************************************/
tBTM_SEC_DEV_REC *btm_sec_alloc_dev (BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC *p_dev_rec = NULL;
    tBTM_INQ_INFO    *p_inq_info;
    int               i;
    DEV_CLASS         old_cod;
    int               i_new_entry = BTM_SEC_MAX_DEVICE_RECORDS;
    int               i_old_entry = BTM_SEC_MAX_DEVICE_RECORDS;
    BTM_TRACE_EVENT ("btm_sec_alloc_dev\n");

    for (i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++) {
        /* look for old entry where device details are present */
        if (!(btm_cb.sec_dev_rec[i].sec_flags & BTM_SEC_IN_USE) &&
                (!memcmp (btm_cb.sec_dev_rec[i].bd_addr, bd_addr, BD_ADDR_LEN))) {
            i_old_entry = i;
            BTM_TRACE_EVENT ("btm_sec_alloc_dev  old device found\n");
            break;
        }
    }

    for (i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++) {
        if (!(btm_cb.sec_dev_rec[i].sec_flags & BTM_SEC_IN_USE)) {
            i_new_entry = i;
            break;
        }
    }

    if (i_new_entry == BTM_SEC_MAX_DEVICE_RECORDS) {
        p_dev_rec = btm_find_oldest_dev();
    } else {
        /* if the old device entry not present go with
            new entry */
        if (i_old_entry == BTM_SEC_MAX_DEVICE_RECORDS) {
            p_dev_rec = &btm_cb.sec_dev_rec[i_new_entry];
        } else {
            p_dev_rec = &btm_cb.sec_dev_rec[i_old_entry];
            memcpy (old_cod, p_dev_rec->dev_class, DEV_CLASS_LEN);
        }
    }
    memset (p_dev_rec, 0, sizeof (tBTM_SEC_DEV_REC));

    /* Retain the old COD for device */
    if (i_old_entry != BTM_SEC_MAX_DEVICE_RECORDS) {
        BTM_TRACE_EVENT ("btm_sec_alloc_dev restoring cod \n");
        memcpy (p_dev_rec->dev_class, old_cod, DEV_CLASS_LEN);

    }

    p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;           /* Default value */
    p_dev_rec->sec_flags = BTM_SEC_IN_USE;

    /* Check with the BT manager if details about remote device are known */
    /* outgoing connection */
    if ((p_inq_info = BTM_InqDbRead(bd_addr)) != NULL) {
        memcpy (p_dev_rec->dev_class, p_inq_info->results.dev_class, DEV_CLASS_LEN);

#if BLE_INCLUDED == TRUE
        p_dev_rec->device_type = p_inq_info->results.device_type;
        p_dev_rec->ble.ble_addr_type = p_inq_info->results.ble_addr_type;

        /* update conn params, use default value for background connection params */
        memset(&p_dev_rec->conn_params, 0xff, sizeof(tBTM_LE_CONN_PRAMS));
#endif
    } else {
#if BLE_INCLUDED == TRUE
        /* update conn params, use default value for background connection params */
        memset(&p_dev_rec->conn_params, 0xff, sizeof(tBTM_LE_CONN_PRAMS));
#endif

        if (!memcmp (bd_addr, btm_cb.connecting_bda, BD_ADDR_LEN)) {
            memcpy (p_dev_rec->dev_class, btm_cb.connecting_dc, DEV_CLASS_LEN);
        }
    }

    memcpy (p_dev_rec->bd_addr, bd_addr, BD_ADDR_LEN);

#if BLE_INCLUDED == TRUE
    p_dev_rec->ble_hci_handle = BTM_GetHCIConnHandle (bd_addr, BT_TRANSPORT_LE);
#endif
    p_dev_rec->hci_handle = BTM_GetHCIConnHandle (bd_addr, BT_TRANSPORT_BR_EDR);
    p_dev_rec->timestamp = btm_cb.dev_rec_count++;

    return (p_dev_rec);
}


/*******************************************************************************
**
** Function         btm_sec_free_dev
**
** Description      Mark device record as not used
**
*******************************************************************************/
void btm_sec_free_dev (tBTM_SEC_DEV_REC *p_dev_rec)
{
    p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;
    p_dev_rec->sec_flags = 0;

#if BLE_INCLUDED == TRUE
    /* Clear out any saved BLE keys */
    btm_sec_clear_ble_keys (p_dev_rec);
#endif


}

/*******************************************************************************
**
** Function         btm_dev_support_switch
**
** Description      This function is called by the L2CAP to check if remote
**                  device supports role switch
**
** Parameters:      bd_addr       - Address of the peer device
**
** Returns          TRUE if device is known and role switch is supported
**
*******************************************************************************/
BOOLEAN btm_dev_support_switch (BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC  *p_dev_rec;
    UINT8   xx;
    BOOLEAN feature_empty = TRUE;

#if BTM_SCO_INCLUDED == TRUE
    /* Role switch is not allowed if a SCO is up */
    if (btm_is_sco_active_by_bdaddr(bd_addr)) {
        return (FALSE);
    }
#endif
    p_dev_rec = btm_find_dev (bd_addr);
    if (p_dev_rec && controller_get_interface()->supports_master_slave_role_switch()) {
        if (HCI_SWITCH_SUPPORTED(p_dev_rec->features[HCI_EXT_FEATURES_PAGE_0])) {
            BTM_TRACE_DEBUG("btm_dev_support_switch return TRUE (feature found)\n");
            return (TRUE);
        }

        /* If the feature field is all zero, we never received them */
        for (xx = 0 ; xx < BD_FEATURES_LEN ; xx++) {
            if (p_dev_rec->features[HCI_EXT_FEATURES_PAGE_0][xx] != 0x00) {
                feature_empty = FALSE; /* at least one is != 0 */
                break;
            }
        }

        /* If we don't know peer's capabilities, assume it supports Role-switch */
        if (feature_empty) {
            BTM_TRACE_DEBUG("btm_dev_support_switch return TRUE (feature empty)\n");
            return (TRUE);
        }
    }

    BTM_TRACE_DEBUG("btm_dev_support_switch return FALSE\n");
    return (FALSE);
}

/*******************************************************************************
**
** Function         btm_find_dev_by_handle
**
** Description      Look for the record in the device database for the record
**                  with specified handle
**
** Returns          Pointer to the record or NULL
**
*******************************************************************************/
tBTM_SEC_DEV_REC *btm_find_dev_by_handle (UINT16 handle)
{
    tBTM_SEC_DEV_REC *p_dev_rec = &btm_cb.sec_dev_rec[0];
    int i;

    for (i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++, p_dev_rec++) {
        if ((p_dev_rec->sec_flags & BTM_SEC_IN_USE)
                && ((p_dev_rec->hci_handle == handle)
#if BLE_INCLUDED == TRUE
                    || (p_dev_rec->ble_hci_handle == handle)
#endif
                   )) {
            return (p_dev_rec);
        }
    }
    return (NULL);
}

/*******************************************************************************
**
** Function         btm_find_dev
**
** Description      Look for the record in the device database for the record
**                  with specified BD address
**
** Returns          Pointer to the record or NULL
**
*******************************************************************************/
tBTM_SEC_DEV_REC *btm_find_dev(BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC *p_dev_rec = &btm_cb.sec_dev_rec[0];

    if (bd_addr) {
        for (uint8_t i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++, p_dev_rec++) {
            if (p_dev_rec->sec_flags & BTM_SEC_IN_USE) {
                if (!memcmp (p_dev_rec->bd_addr, bd_addr, BD_ADDR_LEN)) {
                    return (p_dev_rec);
                }

#if BLE_INCLUDED == TRUE
                // If a LE random address is looking for device record
                if (!memcmp(p_dev_rec->ble.pseudo_addr, bd_addr, BD_ADDR_LEN)) {
                    return (p_dev_rec);
                }

                if (btm_ble_addr_resolvable(bd_addr, p_dev_rec)) {
                    return (p_dev_rec);
                }
#endif
            }
        }
    }
    return (NULL);
}

/*******************************************************************************
**
** Function         btm_consolidate_dev
**
** Description      combine security records if identified as same peer
**
** Returns          none
**
*******************************************************************************/
void btm_consolidate_dev(tBTM_SEC_DEV_REC *p_target_rec)
{
#if BLE_INCLUDED == TRUE && SMP_INCLUDED == TRUE
    tBTM_SEC_DEV_REC *p_dev_rec = &btm_cb.sec_dev_rec[0];
    tBTM_SEC_DEV_REC temp_rec = *p_target_rec;

    BTM_TRACE_DEBUG("%s\n", __func__);

    for (uint8_t i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++, p_dev_rec++) {
        if (p_target_rec != p_dev_rec && p_dev_rec->sec_flags & BTM_SEC_IN_USE) {
            if (!memcmp (p_dev_rec->bd_addr, p_target_rec->bd_addr, BD_ADDR_LEN)) {
                memcpy(p_target_rec, p_dev_rec, sizeof(tBTM_SEC_DEV_REC));
                p_target_rec->ble = temp_rec.ble;
                p_target_rec->ble_hci_handle = temp_rec.ble_hci_handle;
                p_target_rec->enc_key_size = temp_rec.enc_key_size;
                p_target_rec->conn_params = temp_rec.conn_params;
                p_target_rec->device_type |= temp_rec.device_type;
                p_target_rec->sec_flags |= temp_rec.sec_flags;

                p_target_rec->new_encryption_key_is_p256 = temp_rec.new_encryption_key_is_p256;
                p_target_rec->no_smp_on_br = temp_rec.no_smp_on_br;
                p_target_rec->bond_type = temp_rec.bond_type;
                /* mark the combined record as unused */
                p_dev_rec->sec_flags &= ~BTM_SEC_IN_USE;
                p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;
                break;
            }

            /* an RPA device entry is a duplicate of the target record */
            if (btm_ble_addr_resolvable(p_dev_rec->bd_addr, p_target_rec)) {
                if (memcmp(p_target_rec->ble.pseudo_addr, p_dev_rec->bd_addr, BD_ADDR_LEN) == 0) {
                    p_target_rec->ble.ble_addr_type = p_dev_rec->ble.ble_addr_type;
                    p_target_rec->device_type |= p_dev_rec->device_type;
                    p_dev_rec->sec_flags &= ~BTM_SEC_IN_USE;
                    p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;
                }
                break;
            }
        }
    }
#endif
}

/*******************************************************************************
**
** Function         btm_find_or_alloc_dev
**
** Description      Look for the record in the device database for the record
**                  with specified BD address
**
** Returns          Pointer to the record or NULL
**
*******************************************************************************/
tBTM_SEC_DEV_REC *btm_find_or_alloc_dev (BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC *p_dev_rec;
    BTM_TRACE_EVENT ("btm_find_or_alloc_dev\n");
    if ((p_dev_rec = btm_find_dev (bd_addr)) == NULL) {

        /* Allocate a new device record or reuse the oldest one */
        p_dev_rec = btm_sec_alloc_dev (bd_addr);
    }
    return (p_dev_rec);
}

/*******************************************************************************
**
** Function         btm_find_oldest_dev
**
** Description      Locates the oldest device in use. It first looks for
**                  the oldest non-paired device.  If all devices are paired it
**                  deletes the oldest paired device.
**
** Returns          Pointer to the record or NULL
**
*******************************************************************************/
tBTM_SEC_DEV_REC *btm_find_oldest_dev (void)
{
    tBTM_SEC_DEV_REC *p_dev_rec = &btm_cb.sec_dev_rec[0];
    tBTM_SEC_DEV_REC *p_oldest = p_dev_rec;
    UINT32       ot = 0xFFFFFFFF;
    int i;

    /* First look for the non-paired devices for the oldest entry */
    for (i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++, p_dev_rec++) {
        if (((p_dev_rec->sec_flags & BTM_SEC_IN_USE) == 0)
                || ((p_dev_rec->sec_flags & (BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LE_LINK_KEY_KNOWN)) != 0)) {
            continue;    /* Device is paired so skip it */
        }

        if (p_dev_rec->timestamp < ot) {
            p_oldest = p_dev_rec;
            ot       = p_dev_rec->timestamp;
        }
    }

    if (ot != 0xFFFFFFFF) {
        return (p_oldest);
    }

    /* All devices are paired; find the oldest */
    p_dev_rec = &btm_cb.sec_dev_rec[0];
    for (i = 0; i < BTM_SEC_MAX_DEVICE_RECORDS; i++, p_dev_rec++) {
        if ((p_dev_rec->sec_flags & BTM_SEC_IN_USE) == 0) {
            continue;
        }

        if (p_dev_rec->timestamp < ot) {
            p_oldest = p_dev_rec;
            ot       = p_dev_rec->timestamp;
        }
    }
    return (p_oldest);
}

/*******************************************************************************
**
** Function         btm_get_bond_type_dev
**
** Description      Get the bond type for a device in the device database
**                  with specified BD address
**
** Returns          The device bond type if known, otherwise BOND_TYPE_UNKNOWN
**
*******************************************************************************/
tBTM_BOND_TYPE btm_get_bond_type_dev(BD_ADDR bd_addr)
{
    tBTM_SEC_DEV_REC *p_dev_rec = btm_find_dev(bd_addr);

    if (p_dev_rec == NULL) {
        return BOND_TYPE_UNKNOWN;
    }

    return p_dev_rec->bond_type;
}

/*******************************************************************************
**
** Function         btm_set_bond_type_dev
**
** Description      Set the bond type for a device in the device database
**                  with specified BD address
**
** Returns          TRUE on success, otherwise FALSE
**
*******************************************************************************/
BOOLEAN btm_set_bond_type_dev(BD_ADDR bd_addr, tBTM_BOND_TYPE bond_type)
{
    tBTM_SEC_DEV_REC *p_dev_rec = btm_find_dev(bd_addr);

    if (p_dev_rec == NULL) {
        return FALSE;
    }

    p_dev_rec->bond_type = bond_type;
    return TRUE;
}