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/******************************************************************************
*
* 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 "device/include/controller.h"
#include "bt_common.h"
#include "hcimsgs.h"
#include "btu.h"
#include "btm_api.h"
#include "btm_int.h"
#include "hcidefs.h"
#include "l2c_api.h"
/*******************************************************************************
**
** 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)
{
BTM_TRACE_API("%s: link key type:%x", __func__, key_type);
tBTM_SEC_DEV_REC *p_dev_rec = btm_find_dev (bd_addr);
if (!p_dev_rec)
{
p_dev_rec = btm_sec_allocate_dev_rec();
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
} else {
/* "Bump" timestamp for existing record */
p_dev_rec->timestamp = btm_cb.dev_rec_count++;
/* TODO(eisenbach):
* Small refactor, but leaving original logic for now.
* On the surface, this does not make any sense at all. Why change the
* bond state for an existing device here? This logic should be verified
* as part of a larger refactor.
*/
p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;
}
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;
strlcpy ((char *)p_dev_rec->sec_bd_name,
(char *)bd_name, BTM_MAX_REM_BD_NAME_LEN);
}
p_dev_rec->num_read_pages = 0;
if (features)
{
BOOLEAN found = FALSE;
memcpy (p_dev_rec->features, features, sizeof (p_dev_rec->features));
for (int i = HCI_EXT_FEATURES_PAGE_MAX; !found && i >= 0; i--)
{
for (int j = 0; j < HCI_FEATURE_BYTES_PER_PAGE; j++)
{
if (p_dev_rec->features[i][j] != 0)
{
found = TRUE;
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 ("%s: BDA: %02x:%02x:%02x:%02x:%02x:%02x", __func__,
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 flag 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 | BTM_SEC_LINK_KEY_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;
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)
{
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", __func__);
return FALSE;
}
tBTM_SEC_DEV_REC *p_dev_rec = btm_find_dev(bd_addr);
if (p_dev_rec != 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);
}
bool is_bd_addr_equal(void *data, void *context)
{
tBTM_SEC_DEV_REC *p_dev_rec = data;
BD_ADDR *bd_addr = context;
if (!memcmp(p_dev_rec->bd_addr, bd_addr, BD_ADDR_LEN))
return false;
return true;
}
/*******************************************************************************
**
** 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_INQ_INFO *p_inq_info;
BTM_TRACE_EVENT ("btm_sec_alloc_dev");
tBTM_SEC_DEV_REC *p_dev_rec = btm_sec_allocate_dev_rec();
/* 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;
#endif
}
else if (!memcmp (bd_addr, btm_cb.connecting_bda, BD_ADDR_LEN))
memcpy (p_dev_rec->dev_class, btm_cb.connecting_dc, DEV_CLASS_LEN);
#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
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);
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)
{
#if BLE_INCLUDED == TRUE
/* Clear out any saved BLE keys */
btm_sec_clear_ble_keys (p_dev_rec);
#endif
list_remove(btm_cb.sec_dev_rec, p_dev_rec);
}
/*******************************************************************************
**
** 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)");
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)");
return (TRUE);
}
}
BTM_TRACE_DEBUG("btm_dev_support_switch return FALSE");
return(FALSE);
}
bool is_handle_equal(void *data, void *context)
{
tBTM_SEC_DEV_REC *p_dev_rec = data;
UINT16 *handle = context;
if (p_dev_rec->hci_handle == *handle
#if BLE_INCLUDED == TRUE
|| p_dev_rec->ble_hci_handle == *handle
#endif
)
return false;
return true;
}
/*******************************************************************************
**
** 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)
{
list_node_t *n = list_foreach(btm_cb.sec_dev_rec, is_handle_equal, &handle);
if (n)
return list_node(n);
return NULL;
}
bool is_address_equal(void *data, void *context)
{
tBTM_SEC_DEV_REC *p_dev_rec = data;
BD_ADDR *bd_addr = context;
if (!memcmp (p_dev_rec->bd_addr, *bd_addr, BD_ADDR_LEN))
return false;
#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 false;
if (btm_ble_addr_resolvable(*bd_addr, p_dev_rec))
return false;
#endif
return true;
}
/*******************************************************************************
**
** 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(const BD_ADDR bd_addr)
{
if (!bd_addr)
return NULL;
list_node_t *n = list_foreach(btm_cb.sec_dev_rec, is_address_equal, (void*)bd_addr);
if (n)
return list_node(n);
return NULL;
}
/*******************************************************************************
**
** Function btm_consolidate_dev
5**
** 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
tBTM_SEC_DEV_REC temp_rec = *p_target_rec;
BTM_TRACE_DEBUG("%s", __func__);
list_node_t *end = list_end(btm_cb.sec_dev_rec);
for (list_node_t *node = list_begin(btm_cb.sec_dev_rec); node != end; node = list_next(node)) {
tBTM_SEC_DEV_REC *p_dev_rec = list_node(node);
if (p_target_rec == p_dev_rec)
continue;
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;
/* remove the combined record */
list_remove(btm_cb.sec_dev_rec, p_dev_rec);
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;
/* remove the combined record */
list_remove(btm_cb.sec_dev_rec, p_dev_rec);
}
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");
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_rec
**
** Description Locates the oldest device in use. It first looks for
** the oldest non-paired device. If all devices are paired it
** returns the oldest paired device.
**
** Returns Pointer to the record or NULL
**
*******************************************************************************/
static tBTM_SEC_DEV_REC* btm_find_oldest_dev_rec (void)
{
tBTM_SEC_DEV_REC *p_oldest = NULL;
UINT32 ts_oldest = 0xFFFFFFFF;
tBTM_SEC_DEV_REC *p_oldest_paired = NULL;
UINT32 ts_oldest_paired = 0xFFFFFFFF;
list_node_t *end = list_end(btm_cb.sec_dev_rec);
for (list_node_t *node = list_begin(btm_cb.sec_dev_rec); node != end; node = list_next(node)) {
tBTM_SEC_DEV_REC *p_dev_rec = list_node(node);
if ((p_dev_rec->sec_flags & (BTM_SEC_LINK_KEY_KNOWN | BTM_SEC_LE_LINK_KEY_KNOWN)) == 0) {
// Device is not paired
if (p_dev_rec->timestamp < ts_oldest) {
p_oldest = p_dev_rec;
ts_oldest = p_dev_rec->timestamp;
}
} else {
// Paired device
if (p_dev_rec->timestamp < ts_oldest_paired) {
p_oldest_paired = p_dev_rec;
ts_oldest_paired = p_dev_rec->timestamp;
}
}
}
// If we did not find any non-paired devices, use the oldest paired one...
if (ts_oldest == 0xFFFFFFFF)
p_oldest = p_oldest_paired;
return p_oldest;
}
/*******************************************************************************
**
** Function btm_sec_allocate_dev_rec
**
** Description Attempts to allocate a new device record. If we have
** exceeded the maximum number of allowable records to
** allocate, the oldest record will be deleted to make room
** for the new record.
**
** Returns Pointer to the newly allocated record
**
*******************************************************************************/
tBTM_SEC_DEV_REC* btm_sec_allocate_dev_rec(void)
{
tBTM_SEC_DEV_REC *p_dev_rec = NULL;
if (list_length(btm_cb.sec_dev_rec) > BTM_SEC_MAX_DEVICE_RECORDS)
{
p_dev_rec = btm_find_oldest_dev_rec();
list_remove(btm_cb.sec_dev_rec, p_dev_rec);
}
p_dev_rec = osi_calloc(sizeof(tBTM_SEC_DEV_REC));
list_append(btm_cb.sec_dev_rec, p_dev_rec);
// Initialize defaults
p_dev_rec->sec_flags = BTM_SEC_IN_USE;
p_dev_rec->bond_type = BOND_TYPE_UNKNOWN;
p_dev_rec->timestamp = btm_cb.dev_rec_count++;
return p_dev_rec;
}
/*******************************************************************************
**
** 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;
}