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source/nordic_sdk/components/ble/common/ble_conn_state.c
- Committer:
- tb942
- Date:
- 2018-08-14
- Revision:
- 9:d3dd910b0f4b
- Parent:
- 0:bc2961fa1ef0
File content as of revision 9:d3dd910b0f4b:
/* * Copyright (c) Nordic Semiconductor ASA * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, this * list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of other * contributors to this software may be used to endorse or promote products * derived from this software without specific prior written permission. * * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include "ble_conn_state.h" #include <stdbool.h> #include <stdint.h> #include <string.h> #include "ble.h" #include "sdk_mapped_flags.h" #include "app_error.h" #if defined(__CC_ARM) #pragma push #pragma anon_unions #elif defined(__ICCARM__) #pragma language=extended #elif defined(__GNUC__) /* anonymous unions are enabled by default */ #endif #define BLE_CONN_STATE_N_DEFAULT_FLAGS 5 /**< The number of flags kept for each connection, excluding user flags. */ #define BLE_CONN_STATE_N_FLAGS (BLE_CONN_STATE_N_DEFAULT_FLAGS + BLE_CONN_STATE_N_USER_FLAGS) /**< The number of flags kept for each connection, including user flags. */ /**@brief Structure containing all the flag collections maintained by the Connection State module. */ typedef struct { sdk_mapped_flags_t valid_flags; /**< Flags indicating which connection handles are valid. */ sdk_mapped_flags_t connected_flags; /**< Flags indicating which connections are connected, since disconnected connection handles will not immediately be invalidated. */ sdk_mapped_flags_t central_flags; /**< Flags indicating in which connections the local device is the central. */ sdk_mapped_flags_t encrypted_flags; /**< Flags indicating which connections are encrypted. */ sdk_mapped_flags_t mitm_protected_flags; /**< Flags indicating which connections have encryption with protection from man-in-the-middle attacks. */ sdk_mapped_flags_t user_flags[BLE_CONN_STATE_N_USER_FLAGS]; /**< Flags that can be reserved by the user. The flags will be cleared when a connection is invalidated, otherwise, the user is wholly responsible for the flag states. */ } ble_conn_state_flag_collections_t; /**@brief Structure containing the internal state of the Connection State module. */ typedef struct { uint16_t acquired_flags; /**< Bitmap for keeping track of which user flags have been acquired. */ uint16_t valid_conn_handles[SDK_MAPPED_FLAGS_N_KEYS]; /**< List of connection handles used as keys for the sdk_mapped_flags module. */ union { ble_conn_state_flag_collections_t flags; /**< Flag collections kept by the Connection State module. */ sdk_mapped_flags_t flag_array[BLE_CONN_STATE_N_FLAGS]; /**< Flag collections as array to allow use of @ref sdk_mapped_flags_bulk_update_by_key() when setting all flags. */ }; } ble_conn_state_t; #if defined(__CC_ARM) #pragma pop #elif defined(__ICCARM__) /* leave anonymous unions enabled */ #elif defined(__GNUC__) /* anonymous unions are enabled by default */ #endif static ble_conn_state_t m_bcs = {0}; /**< Instantiation of the internal state. */ /**@brief Function for resetting all internal memory to the values it had at initialization. */ void bcs_internal_state_reset(void) { memset( &m_bcs, 0, sizeof(ble_conn_state_t) ); } /**@brief Function for activating a connection record. * * @param p_record The record to activate. * @param conn_handle The connection handle to copy into the record. * @param role The role of the connection. * * @return whether the record was activated successfully. */ static bool record_activate(uint16_t conn_handle) { uint16_t available_index = sdk_mapped_flags_first_key_index_get(~m_bcs.flags.valid_flags); if (available_index != SDK_MAPPED_FLAGS_INVALID_INDEX) { m_bcs.valid_conn_handles[available_index] = conn_handle; sdk_mapped_flags_update_by_key(m_bcs.valid_conn_handles, &m_bcs.flags.connected_flags, conn_handle, 1); sdk_mapped_flags_update_by_key(m_bcs.valid_conn_handles, &m_bcs.flags.valid_flags, conn_handle, 1); return true; } return false; } /**@brief Function for marking a connection record as invalid and resetting the values. * * @param p_record The record to invalidate. */ static void record_invalidate(uint16_t conn_handle) { sdk_mapped_flags_bulk_update_by_key(m_bcs.valid_conn_handles, m_bcs.flag_array, BLE_CONN_STATE_N_FLAGS, conn_handle, 0); } /**@brief Function for marking a connection as disconnected. See @ref BLE_CONN_STATUS_DISCONNECTED. * * @param p_record The record of the connection to set as disconnected. */ static void record_set_disconnected(uint16_t conn_handle) { sdk_mapped_flags_update_by_key(m_bcs.valid_conn_handles, &m_bcs.flags.connected_flags, conn_handle, 0); } /**@brief Function for invalidating records with a @ref BLE_CONN_STATUS_DISCONNECTED * connection status */ static void record_purge_disconnected() { sdk_mapped_flags_key_list_t disconnected_list; disconnected_list = sdk_mapped_flags_key_list_get( m_bcs.valid_conn_handles, (~m_bcs.flags.connected_flags) & (m_bcs.flags.valid_flags)); for (int i = 0; i < disconnected_list.len; i++) { record_invalidate(disconnected_list.flag_keys[i]); } } /**@brief Function for checking if a user flag has been acquired. * * @param[in] flag_id Which flag to check. * * @return Whether the flag has been acquired. */ static bool user_flag_is_acquired(ble_conn_state_user_flag_id_t flag_id) { return ((m_bcs.acquired_flags & (1 << flag_id)) != 0); } /**@brief Function for marking a user flag as acquired. * * @param[in] flag_id Which flag to mark. */ static void user_flag_acquire(ble_conn_state_user_flag_id_t flag_id) { m_bcs.acquired_flags |= (1 << flag_id); } void ble_conn_state_init(void) { bcs_internal_state_reset(); } void ble_conn_state_on_ble_evt(ble_evt_t * p_ble_evt) { switch (p_ble_evt->header.evt_id) { case BLE_GAP_EVT_CONNECTED: record_purge_disconnected(); if ( !record_activate(p_ble_evt->evt.gap_evt.conn_handle) ) { // No more records available. Should not happen. APP_ERROR_HANDLER(NRF_ERROR_NO_MEM); } else { #if defined(TARGET_MCU_NRF51_16K_S110) || defined(TARGET_MCU_NRF51_32K_S110) bool is_central = false; #elif defined(TARGET_MCU_NRF51_16K_S120) || defined(TARGET_MCU_NRF51_32K_S120) bool is_central = true; #else bool is_central = (p_ble_evt->evt.gap_evt.params.connected.role == BLE_GAP_ROLE_CENTRAL); #endif sdk_mapped_flags_update_by_key(m_bcs.valid_conn_handles, &m_bcs.flags.central_flags, p_ble_evt->evt.gap_evt.conn_handle, is_central); } break; case BLE_GAP_EVT_DISCONNECTED: record_set_disconnected(p_ble_evt->evt.gap_evt.conn_handle); break; case BLE_GAP_EVT_CONN_SEC_UPDATE: sdk_mapped_flags_update_by_key( m_bcs.valid_conn_handles, &m_bcs.flags.encrypted_flags, p_ble_evt->evt.gap_evt.conn_handle, (p_ble_evt->evt.gap_evt.params.conn_sec_update.conn_sec.sec_mode.lv > 1)); sdk_mapped_flags_update_by_key( m_bcs.valid_conn_handles, &m_bcs.flags.mitm_protected_flags, p_ble_evt->evt.gap_evt.conn_handle, (p_ble_evt->evt.gap_evt.params.conn_sec_update.conn_sec.sec_mode.lv > 2)); break; } } bool ble_conn_state_valid(uint16_t conn_handle) { return sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.valid_flags, conn_handle); } uint8_t ble_conn_state_role(uint16_t conn_handle) { uint8_t role = BLE_GAP_ROLE_INVALID; if ( sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.valid_flags, conn_handle) ) { bool central = sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.central_flags, conn_handle); role = central ? BLE_GAP_ROLE_CENTRAL : BLE_GAP_ROLE_PERIPH; } return role; } ble_conn_state_status_t ble_conn_state_status(uint16_t conn_handle) { ble_conn_state_status_t conn_status = BLE_CONN_STATUS_INVALID; bool valid = sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.valid_flags, conn_handle); if (valid) { bool connected = sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.connected_flags, conn_handle); conn_status = connected ? BLE_CONN_STATUS_CONNECTED : BLE_CONN_STATUS_DISCONNECTED; } return conn_status; } bool ble_conn_state_encrypted(uint16_t conn_handle) { return sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.encrypted_flags, conn_handle); } bool ble_conn_state_mitm_protected(uint16_t conn_handle) { return sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.mitm_protected_flags, conn_handle); } uint32_t ble_conn_state_n_connections(void) { return sdk_mapped_flags_n_flags_set(m_bcs.flags.connected_flags); } uint32_t ble_conn_state_n_centrals(void) { return sdk_mapped_flags_n_flags_set((m_bcs.flags.central_flags) & (m_bcs.flags.connected_flags)); } uint32_t ble_conn_state_n_peripherals(void) { return sdk_mapped_flags_n_flags_set((~m_bcs.flags.central_flags) & (m_bcs.flags.connected_flags)); } sdk_mapped_flags_key_list_t ble_conn_state_conn_handles(void) { return sdk_mapped_flags_key_list_get(m_bcs.valid_conn_handles, m_bcs.flags.valid_flags); } sdk_mapped_flags_key_list_t ble_conn_state_central_handles(void) { return sdk_mapped_flags_key_list_get(m_bcs.valid_conn_handles, (m_bcs.flags.central_flags) & (m_bcs.flags.connected_flags)); } sdk_mapped_flags_key_list_t ble_conn_state_periph_handles(void) { return sdk_mapped_flags_key_list_get(m_bcs.valid_conn_handles, (~m_bcs.flags.central_flags) & (m_bcs.flags.connected_flags)); } ble_conn_state_user_flag_id_t ble_conn_state_user_flag_acquire(void) { for (ble_conn_state_user_flag_id_t i = BLE_CONN_STATE_USER_FLAG0; i < BLE_CONN_STATE_N_USER_FLAGS; i++) { if ( !user_flag_is_acquired(i) ) { user_flag_acquire(i); return i; } } return BLE_CONN_STATE_USER_FLAG_INVALID; } bool ble_conn_state_user_flag_get(uint16_t conn_handle, ble_conn_state_user_flag_id_t flag_id) { if (user_flag_is_acquired(flag_id)) { return sdk_mapped_flags_get_by_key(m_bcs.valid_conn_handles, m_bcs.flags.user_flags[flag_id], conn_handle); } else { return false; } } void ble_conn_state_user_flag_set(uint16_t conn_handle, ble_conn_state_user_flag_id_t flag_id, bool value) { if (user_flag_is_acquired(flag_id)) { sdk_mapped_flags_update_by_key(m_bcs.valid_conn_handles, &m_bcs.flags.user_flags[flag_id], conn_handle, value); } } sdk_mapped_flags_t ble_conn_state_user_flag_collection(ble_conn_state_user_flag_id_t flag_id) { if ( user_flag_is_acquired(flag_id) ) { return m_bcs.flags.user_flags[flag_id]; } else { return 0; } }