| /****************************************************************************** |
| * |
| * Copyright 2008-2012 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 the main GATT server attributes access request |
| * handling functions. |
| * |
| ******************************************************************************/ |
| |
| #include <map> |
| |
| #include "base/callback.h" |
| #include "bt_target.h" |
| #include "bt_utils.h" |
| #include "btif/include/btif_storage.h" |
| #include "eatt/eatt.h" |
| #include "gatt_api.h" |
| #include "gatt_int.h" |
| #include "gd/common/init_flags.h" |
| #include "osi/include/log.h" |
| #include "osi/include/osi.h" |
| #include "stack/include/bt_types.h" |
| #include "types/bluetooth/uuid.h" |
| #include "types/raw_address.h" |
| |
| #include <base/logging.h> |
| |
| using base::StringPrintf; |
| using bluetooth::Uuid; |
| |
| #define BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK 0x01 |
| |
| #define BLE_GATT_CL_SUP_FEAT_CACHING_BITMASK 0x01 |
| #define BLE_GATT_CL_SUP_FEAT_EATT_BITMASK 0x02 |
| #define BLE_GATT_CL_SUP_FEAT_MULTI_NOTIF_BITMASK 0x04 |
| |
| #define BLE_GATT_CL_ANDROID_SUP_FEAT \ |
| (BLE_GATT_CL_SUP_FEAT_EATT_BITMASK | BLE_GATT_CL_SUP_FEAT_MULTI_NOTIF_BITMASK) |
| |
| using gatt_sr_supported_feat_cb = |
| base::OnceCallback<void(const RawAddress&, uint8_t)>; |
| |
| typedef struct { |
| uint16_t op_uuid; |
| gatt_sr_supported_feat_cb cb; |
| } gatt_op_cb_data; |
| |
| static std::map<uint16_t, gatt_op_cb_data> OngoingOps; |
| |
| static void gatt_request_cback(uint16_t conn_id, uint32_t trans_id, |
| uint8_t op_code, tGATTS_DATA* p_data); |
| static void gatt_connect_cback(UNUSED_ATTR tGATT_IF gatt_if, |
| const RawAddress& bda, uint16_t conn_id, |
| bool connected, tGATT_DISCONN_REASON reason, |
| tBT_TRANSPORT transport); |
| static void gatt_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, |
| tGATT_DISC_RES* p_data); |
| static void gatt_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, |
| tGATT_STATUS status); |
| static void gatt_cl_op_cmpl_cback(uint16_t conn_id, tGATTC_OPTYPE op, |
| tGATT_STATUS status, |
| tGATT_CL_COMPLETE* p_data); |
| |
| static void gatt_cl_start_config_ccc(tGATT_PROFILE_CLCB* p_clcb); |
| |
| static bool gatt_sr_is_robust_caching_enabled(); |
| |
| static tGATT_STATUS gatt_sr_read_db_hash(uint16_t conn_id, |
| tGATT_VALUE* p_value); |
| static tGATT_STATUS gatt_sr_read_cl_supp_feat(uint16_t conn_id, |
| tGATT_VALUE* p_value); |
| static tGATT_STATUS gatt_sr_write_cl_supp_feat(uint16_t conn_id, |
| tGATT_WRITE_REQ* p_data); |
| |
| static tGATT_CBACK gatt_profile_cback = {.p_conn_cb = gatt_connect_cback, |
| .p_cmpl_cb = gatt_cl_op_cmpl_cback, |
| .p_disc_res_cb = gatt_disc_res_cback, |
| .p_disc_cmpl_cb = gatt_disc_cmpl_cback, |
| .p_req_cb = gatt_request_cback, |
| .p_enc_cmpl_cb = nullptr, |
| .p_congestion_cb = nullptr, |
| .p_phy_update_cb = nullptr, |
| .p_conn_update_cb = nullptr}; |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_find_conn_id_by_bd_addr |
| * |
| * Description Find the connection ID by remote address |
| * |
| * Returns Connection ID |
| * |
| ******************************************************************************/ |
| uint16_t gatt_profile_find_conn_id_by_bd_addr(const RawAddress& remote_bda) { |
| uint16_t conn_id = GATT_INVALID_CONN_ID; |
| GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &conn_id, |
| BT_TRANSPORT_LE); |
| if (conn_id == GATT_INVALID_CONN_ID) |
| GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &conn_id, |
| BT_TRANSPORT_BR_EDR); |
| return conn_id; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_find_clcb_by_conn_id |
| * |
| * Description find clcb by Connection ID |
| * |
| * Returns Pointer to the found link conenction control block. |
| * |
| ******************************************************************************/ |
| static tGATT_PROFILE_CLCB* gatt_profile_find_clcb_by_conn_id(uint16_t conn_id) { |
| uint8_t i_clcb; |
| tGATT_PROFILE_CLCB* p_clcb = NULL; |
| |
| for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS; |
| i_clcb++, p_clcb++) { |
| if (p_clcb->in_use && p_clcb->conn_id == conn_id) return p_clcb; |
| } |
| |
| return NULL; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_find_clcb_by_bd_addr |
| * |
| * Description The function searches all LCBs with macthing bd address. |
| * |
| * Returns Pointer to the found link conenction control block. |
| * |
| ******************************************************************************/ |
| static tGATT_PROFILE_CLCB* gatt_profile_find_clcb_by_bd_addr( |
| const RawAddress& bda, tBT_TRANSPORT transport) { |
| uint8_t i_clcb; |
| tGATT_PROFILE_CLCB* p_clcb = NULL; |
| |
| for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS; |
| i_clcb++, p_clcb++) { |
| if (p_clcb->in_use && p_clcb->transport == transport && p_clcb->connected && |
| p_clcb->bda == bda) |
| return p_clcb; |
| } |
| |
| return NULL; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_clcb_alloc |
| * |
| * Description The function allocates a GATT profile connection link |
| * control block |
| * |
| * Returns NULL if not found. Otherwise pointer to the connection link |
| * block. |
| * |
| ******************************************************************************/ |
| tGATT_PROFILE_CLCB* gatt_profile_clcb_alloc(uint16_t conn_id, |
| const RawAddress& bda, |
| tBT_TRANSPORT tranport) { |
| uint8_t i_clcb = 0; |
| tGATT_PROFILE_CLCB* p_clcb = NULL; |
| |
| for (i_clcb = 0, p_clcb = gatt_cb.profile_clcb; i_clcb < GATT_MAX_APPS; |
| i_clcb++, p_clcb++) { |
| if (!p_clcb->in_use) { |
| p_clcb->in_use = true; |
| p_clcb->conn_id = conn_id; |
| p_clcb->connected = true; |
| p_clcb->transport = tranport; |
| p_clcb->bda = bda; |
| break; |
| } |
| } |
| if (i_clcb < GATT_MAX_APPS) return p_clcb; |
| |
| return NULL; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_clcb_dealloc |
| * |
| * Description The function deallocates a GATT profile connection link |
| * control block |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| void gatt_profile_clcb_dealloc(tGATT_PROFILE_CLCB* p_clcb) { |
| memset(p_clcb, 0, sizeof(tGATT_PROFILE_CLCB)); |
| } |
| |
| /** GAP Attributes Database Request callback */ |
| tGATT_STATUS read_attr_value(uint16_t conn_id, uint16_t handle, |
| tGATT_VALUE* p_value, bool is_long) { |
| uint8_t* p = p_value->value; |
| |
| if (handle == gatt_cb.handle_sr_supported_feat) { |
| /* GATT_UUID_SERVER_SUP_FEAT*/ |
| if (is_long) return GATT_NOT_LONG; |
| |
| UINT8_TO_STREAM(p, gatt_cb.gatt_svr_supported_feat_mask); |
| p_value->len = sizeof(gatt_cb.gatt_svr_supported_feat_mask); |
| return GATT_SUCCESS; |
| } |
| |
| if (handle == gatt_cb.handle_cl_supported_feat) { |
| /*GATT_UUID_CLIENT_SUP_FEAT */ |
| if (is_long) return GATT_NOT_LONG; |
| |
| return gatt_sr_read_cl_supp_feat(conn_id, p_value); |
| } |
| |
| if (handle == gatt_cb.handle_of_database_hash) { |
| /* GATT_UUID_DATABASE_HASH */ |
| if (is_long) return GATT_NOT_LONG; |
| |
| return gatt_sr_read_db_hash(conn_id, p_value); |
| } |
| |
| if (handle == gatt_cb.handle_of_h_r) { |
| /* GATT_UUID_GATT_SRV_CHGD */ |
| return GATT_READ_NOT_PERMIT; |
| } |
| |
| return GATT_NOT_FOUND; |
| } |
| |
| /** GAP Attributes Database Read/Read Blob Request process */ |
| tGATT_STATUS proc_read_req(uint16_t conn_id, tGATTS_REQ_TYPE, |
| tGATT_READ_REQ* p_data, tGATTS_RSP* p_rsp) { |
| if (p_data->is_long) p_rsp->attr_value.offset = p_data->offset; |
| |
| p_rsp->attr_value.handle = p_data->handle; |
| |
| return read_attr_value(conn_id, p_data->handle, &p_rsp->attr_value, |
| p_data->is_long); |
| } |
| |
| /** GAP ATT server process a write request */ |
| tGATT_STATUS proc_write_req(uint16_t conn_id, tGATTS_REQ_TYPE, |
| tGATT_WRITE_REQ* p_data) { |
| uint16_t handle = p_data->handle; |
| |
| /* GATT_UUID_SERVER_SUP_FEAT*/ |
| if (handle == gatt_cb.handle_sr_supported_feat) return GATT_WRITE_NOT_PERMIT; |
| |
| /* GATT_UUID_CLIENT_SUP_FEAT*/ |
| if (handle == gatt_cb.handle_cl_supported_feat) |
| return gatt_sr_write_cl_supp_feat(conn_id, p_data); |
| |
| /* GATT_UUID_DATABASE_HASH */ |
| if (handle == gatt_cb.handle_of_database_hash) return GATT_WRITE_NOT_PERMIT; |
| |
| /* GATT_UUID_GATT_SRV_CHGD */ |
| if (handle == gatt_cb.handle_of_h_r) return GATT_WRITE_NOT_PERMIT; |
| |
| return GATT_NOT_FOUND; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_request_cback |
| * |
| * Description GATT profile attribute access request callback. |
| * |
| * Returns void. |
| * |
| ******************************************************************************/ |
| static void gatt_request_cback(uint16_t conn_id, uint32_t trans_id, |
| tGATTS_REQ_TYPE type, tGATTS_DATA* p_data) { |
| tGATT_STATUS status = GATT_INVALID_PDU; |
| tGATTS_RSP rsp_msg; |
| bool rsp_needed = true; |
| |
| memset(&rsp_msg, 0, sizeof(tGATTS_RSP)); |
| |
| switch (type) { |
| case GATTS_REQ_TYPE_READ_CHARACTERISTIC: |
| case GATTS_REQ_TYPE_READ_DESCRIPTOR: |
| status = proc_read_req(conn_id, type, &p_data->read_req, &rsp_msg); |
| break; |
| |
| case GATTS_REQ_TYPE_WRITE_CHARACTERISTIC: |
| case GATTS_REQ_TYPE_WRITE_DESCRIPTOR: |
| case GATTS_REQ_TYPE_WRITE_EXEC: |
| case GATT_CMD_WRITE: |
| if (!p_data->write_req.need_rsp) rsp_needed = false; |
| |
| status = proc_write_req(conn_id, type, &p_data->write_req); |
| break; |
| |
| case GATTS_REQ_TYPE_MTU: |
| VLOG(1) << "Get MTU exchange new mtu size: " << +p_data->mtu; |
| rsp_needed = false; |
| break; |
| |
| default: |
| VLOG(1) << "Unknown/unexpected LE GAP ATT request: " << loghex(type); |
| break; |
| } |
| |
| if (rsp_needed) GATTS_SendRsp(conn_id, trans_id, status, &rsp_msg); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_connect_cback |
| * |
| * Description Gatt profile connection callback. |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void gatt_connect_cback(UNUSED_ATTR tGATT_IF gatt_if, |
| const RawAddress& bda, uint16_t conn_id, |
| bool connected, tGATT_DISCONN_REASON reason, |
| tBT_TRANSPORT transport) { |
| VLOG(1) << __func__ << ": from " << bda << " connected: " << connected |
| << ", conn_id: " << loghex(conn_id); |
| |
| // if the device is not trusted, remove data when the link is disconnected |
| if (!connected && !btm_sec_is_a_bonded_dev(bda)) { |
| LOG(INFO) << __func__ << ": remove untrusted client status, bda=" << bda; |
| btif_storage_remove_gatt_cl_supp_feat(bda); |
| btif_storage_remove_gatt_cl_db_hash(bda); |
| } |
| |
| tGATT_PROFILE_CLCB* p_clcb = |
| gatt_profile_find_clcb_by_bd_addr(bda, transport); |
| if (p_clcb == NULL) return; |
| |
| if (connected) { |
| p_clcb->conn_id = conn_id; |
| p_clcb->connected = true; |
| |
| if (p_clcb->ccc_stage == GATT_SVC_CHANGED_CONNECTING) { |
| p_clcb->ccc_stage++; |
| gatt_cl_start_config_ccc(p_clcb); |
| } |
| } else { |
| gatt_profile_clcb_dealloc(p_clcb); |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_db_init |
| * |
| * Description Initializa the GATT profile attribute database. |
| * |
| ******************************************************************************/ |
| void gatt_profile_db_init(void) { |
| /* Fill our internal UUID with a fixed pattern 0x81 */ |
| std::array<uint8_t, Uuid::kNumBytes128> tmp; |
| tmp.fill(0x81); |
| |
| /* Create a GATT profile service */ |
| gatt_cb.gatt_if = GATT_Register(Uuid::From128BitBE(tmp), "GattProfileDb", |
| &gatt_profile_cback, false); |
| GATT_StartIf(gatt_cb.gatt_if); |
| |
| Uuid service_uuid = Uuid::From16Bit(UUID_SERVCLASS_GATT_SERVER); |
| |
| Uuid srv_changed_char_uuid = Uuid::From16Bit(GATT_UUID_GATT_SRV_CHGD); |
| Uuid svr_sup_feat_uuid = Uuid::From16Bit(GATT_UUID_SERVER_SUP_FEAT); |
| Uuid cl_sup_feat_uuid = Uuid::From16Bit(GATT_UUID_CLIENT_SUP_FEAT); |
| Uuid database_hash_uuid = Uuid::From16Bit(GATT_UUID_DATABASE_HASH); |
| |
| btgatt_db_element_t service[] = { |
| { |
| .uuid = service_uuid, |
| .type = BTGATT_DB_PRIMARY_SERVICE, |
| }, |
| { |
| .uuid = srv_changed_char_uuid, |
| .type = BTGATT_DB_CHARACTERISTIC, |
| .properties = GATT_CHAR_PROP_BIT_INDICATE, |
| .permissions = 0, |
| }, |
| { |
| .type = BTGATT_DB_CHARACTERISTIC, |
| .uuid = svr_sup_feat_uuid, |
| .properties = GATT_CHAR_PROP_BIT_READ, |
| .permissions = GATT_PERM_READ, |
| }, |
| { |
| .type = BTGATT_DB_CHARACTERISTIC, |
| .uuid = cl_sup_feat_uuid, |
| .properties = GATT_CHAR_PROP_BIT_READ | GATT_CHAR_PROP_BIT_WRITE, |
| .permissions = GATT_PERM_READ | GATT_PERM_WRITE, |
| }, |
| { |
| .uuid = database_hash_uuid, |
| .type = BTGATT_DB_CHARACTERISTIC, |
| .properties = GATT_CHAR_PROP_BIT_READ, |
| .permissions = GATT_PERM_READ, |
| }}; |
| |
| GATTS_AddService(gatt_cb.gatt_if, service, |
| sizeof(service) / sizeof(btgatt_db_element_t)); |
| |
| gatt_cb.handle_of_h_r = service[1].attribute_handle; |
| gatt_cb.handle_sr_supported_feat = service[2].attribute_handle; |
| gatt_cb.handle_cl_supported_feat = service[3].attribute_handle; |
| gatt_cb.handle_of_database_hash = service[4].attribute_handle; |
| |
| gatt_cb.gatt_svr_supported_feat_mask |= BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK; |
| gatt_cb.gatt_cl_supported_feat_mask |= BLE_GATT_CL_ANDROID_SUP_FEAT; |
| |
| if (gatt_sr_is_robust_caching_enabled()) |
| gatt_cb.gatt_cl_supported_feat_mask |= BLE_GATT_CL_SUP_FEAT_CACHING_BITMASK; |
| |
| VLOG(1) << __func__ << ": gatt_if=" << gatt_cb.gatt_if << " EATT supported"; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_disc_res_cback |
| * |
| * Description Gatt profile discovery result callback |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void gatt_disc_res_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, |
| tGATT_DISC_RES* p_data) { |
| tGATT_PROFILE_CLCB* p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id); |
| |
| if (p_clcb == NULL) return; |
| |
| switch (disc_type) { |
| case GATT_DISC_SRVC_BY_UUID: /* stage 1 */ |
| p_clcb->e_handle = p_data->value.group_value.e_handle; |
| p_clcb->ccc_result++; |
| break; |
| |
| case GATT_DISC_CHAR: /* stage 2 */ |
| p_clcb->s_handle = p_data->value.dclr_value.val_handle; |
| p_clcb->ccc_result++; |
| break; |
| |
| case GATT_DISC_CHAR_DSCPT: /* stage 3 */ |
| if (p_data->type == Uuid::From16Bit(GATT_UUID_CHAR_CLIENT_CONFIG)) { |
| p_clcb->s_handle = p_data->handle; |
| p_clcb->ccc_result++; |
| } |
| break; |
| |
| case GATT_DISC_SRVC_ALL: |
| case GATT_DISC_INC_SRVC: |
| case GATT_DISC_MAX: |
| LOG_ERROR("Illegal discovery item handled"); |
| break; |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_disc_cmpl_cback |
| * |
| * Description Gatt profile discovery complete callback |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void gatt_disc_cmpl_cback(uint16_t conn_id, tGATT_DISC_TYPE disc_type, |
| tGATT_STATUS status) { |
| tGATT_PROFILE_CLCB* p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id); |
| if (p_clcb == NULL) { |
| LOG_WARN("Unable to find gatt profile after discovery complete"); |
| return; |
| } |
| |
| if (status != GATT_SUCCESS) { |
| LOG_WARN("Gatt discovery completed with errors status:%u", status); |
| return; |
| } |
| if (p_clcb->ccc_result == 0) { |
| LOG_WARN("Gatt discovery completed but connection was idle id:%hu", |
| conn_id); |
| return; |
| } |
| |
| p_clcb->ccc_result = 0; |
| p_clcb->ccc_stage++; |
| gatt_cl_start_config_ccc(p_clcb); |
| } |
| |
| static bool gatt_svc_read_cl_supp_feat_req(uint16_t conn_id, |
| gatt_op_cb_data* cb) { |
| tGATT_READ_PARAM param; |
| |
| memset(¶m, 0, sizeof(tGATT_READ_PARAM)); |
| |
| param.service.s_handle = 1; |
| param.service.e_handle = 0xFFFF; |
| param.service.auth_req = 0; |
| |
| param.service.uuid = bluetooth::Uuid::From16Bit(GATT_UUID_CLIENT_SUP_FEAT); |
| |
| tGATT_STATUS status = GATTC_Read(conn_id, GATT_READ_BY_TYPE, ¶m); |
| if (status != GATT_SUCCESS) { |
| LOG(ERROR) << __func__ << " Read failed. Status: " |
| << loghex(static_cast<uint8_t>(status)); |
| return false; |
| } |
| |
| cb->op_uuid = GATT_UUID_CLIENT_SUP_FEAT; |
| return true; |
| } |
| |
| static bool gatt_att_write_cl_supp_feat(uint16_t conn_id, uint16_t handle) { |
| tGATT_VALUE attr; |
| |
| memset(&attr, 0, sizeof(tGATT_VALUE)); |
| |
| attr.conn_id = conn_id; |
| attr.handle = handle; |
| attr.len = 1; |
| attr.value[0] = gatt_cb.gatt_cl_supported_feat_mask; |
| |
| tGATT_STATUS status = GATTC_Write(conn_id, GATT_WRITE, &attr); |
| if (status != GATT_SUCCESS) { |
| LOG(ERROR) << __func__ << " Write failed. Status: " |
| << loghex(static_cast<uint8_t>(status)); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_cl_op_cmpl_cback |
| * |
| * Description Gatt profile client operation complete callback |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void gatt_cl_op_cmpl_cback(uint16_t conn_id, tGATTC_OPTYPE op, |
| tGATT_STATUS status, |
| tGATT_CL_COMPLETE* p_data) { |
| auto iter = OngoingOps.find(conn_id); |
| |
| VLOG(1) << __func__ << " opcode: " << loghex(static_cast<uint8_t>(op)) |
| << " status: " << status |
| << " conn id: " << loghex(static_cast<uint8_t>(conn_id)); |
| |
| if (op != GATTC_OPTYPE_READ) return; |
| |
| if (iter == OngoingOps.end()) { |
| LOG(ERROR) << __func__ << " Unexpected read complete"; |
| return; |
| } |
| |
| gatt_op_cb_data* operation_callback_data = &iter->second; |
| uint16_t cl_op_uuid = operation_callback_data->op_uuid; |
| operation_callback_data->op_uuid = 0; |
| |
| uint8_t* pp = p_data->att_value.value; |
| |
| VLOG(1) << __func__ << " cl_op_uuid " << loghex(cl_op_uuid); |
| |
| switch (cl_op_uuid) { |
| case GATT_UUID_SERVER_SUP_FEAT: { |
| uint8_t tcb_idx = GATT_GET_TCB_IDX(conn_id); |
| tGATT_TCB& tcb = gatt_cb.tcb[tcb_idx]; |
| |
| /* Check if EATT is supported */ |
| if (status == GATT_SUCCESS) { |
| STREAM_TO_UINT8(tcb.sr_supp_feat, pp); |
| btif_storage_set_gatt_sr_supp_feat(tcb.peer_bda, tcb.sr_supp_feat); |
| } |
| |
| /* Notify user about the supported features */ |
| std::move(operation_callback_data->cb) |
| .Run(tcb.peer_bda, tcb.sr_supp_feat); |
| |
| /* If server supports EATT lets try to find handle for the |
| * client supported features characteristic, where we could write |
| * our supported features as a client. |
| */ |
| if (tcb.sr_supp_feat & BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK) { |
| /* If read succeed, return here */ |
| if (gatt_svc_read_cl_supp_feat_req(conn_id, operation_callback_data)) |
| return; |
| } |
| |
| /* Could not read client supported charcteristic or eatt is not |
| * supported. Erase callback data now. |
| */ |
| OngoingOps.erase(iter); |
| break; |
| } |
| case GATT_UUID_CLIENT_SUP_FEAT: |
| /*We don't need callback data anymore */ |
| OngoingOps.erase(iter); |
| |
| if (status != GATT_SUCCESS) { |
| LOG(INFO) << __func__ |
| << " Client supported features charcteristic not found"; |
| return; |
| } |
| |
| /* Write our client supported features to the remote device */ |
| gatt_att_write_cl_supp_feat(conn_id, p_data->att_value.handle); |
| break; |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_cl_start_config_ccc |
| * |
| * Description Gatt profile start configure service change CCC |
| * |
| * Returns void |
| * |
| ******************************************************************************/ |
| static void gatt_cl_start_config_ccc(tGATT_PROFILE_CLCB* p_clcb) { |
| |
| VLOG(1) << __func__ << ": stage: " << +p_clcb->ccc_stage; |
| |
| switch (p_clcb->ccc_stage) { |
| case GATT_SVC_CHANGED_SERVICE: /* discover GATT service */ |
| GATTC_Discover(p_clcb->conn_id, GATT_DISC_SRVC_BY_UUID, 0x0001, 0xffff, |
| Uuid::From16Bit(UUID_SERVCLASS_GATT_SERVER)); |
| break; |
| |
| case GATT_SVC_CHANGED_CHARACTERISTIC: /* discover service change char */ |
| GATTC_Discover(p_clcb->conn_id, GATT_DISC_CHAR, 0x0001, p_clcb->e_handle, |
| Uuid::From16Bit(GATT_UUID_GATT_SRV_CHGD)); |
| break; |
| |
| case GATT_SVC_CHANGED_DESCRIPTOR: /* discover service change ccc */ |
| GATTC_Discover(p_clcb->conn_id, GATT_DISC_CHAR_DSCPT, p_clcb->s_handle, |
| p_clcb->e_handle); |
| break; |
| |
| case GATT_SVC_CHANGED_CONFIGURE_CCCD: /* write ccc */ |
| { |
| tGATT_VALUE ccc_value; |
| memset(&ccc_value, 0, sizeof(tGATT_VALUE)); |
| ccc_value.handle = p_clcb->s_handle; |
| ccc_value.len = 2; |
| ccc_value.value[0] = GATT_CLT_CONFIG_INDICATION; |
| GATTC_Write(p_clcb->conn_id, GATT_WRITE, &ccc_value); |
| break; |
| } |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * Function GATT_ConfigServiceChangeCCC |
| * |
| * Description Configure service change indication on remote device |
| * |
| * Returns none |
| * |
| ******************************************************************************/ |
| void GATT_ConfigServiceChangeCCC(const RawAddress& remote_bda, bool enable, |
| tBT_TRANSPORT transport) { |
| tGATT_PROFILE_CLCB* p_clcb = |
| gatt_profile_find_clcb_by_bd_addr(remote_bda, transport); |
| |
| if (p_clcb == NULL) |
| p_clcb = gatt_profile_clcb_alloc(0, remote_bda, transport); |
| |
| if (p_clcb == NULL) return; |
| |
| if (GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &p_clcb->conn_id, |
| transport)) { |
| p_clcb->connected = true; |
| } |
| /* hold the link here */ |
| GATT_Connect(gatt_cb.gatt_if, remote_bda, true, transport, true); |
| p_clcb->ccc_stage = GATT_SVC_CHANGED_CONNECTING; |
| |
| if (!p_clcb->connected) { |
| /* wait for connection */ |
| return; |
| } |
| |
| p_clcb->ccc_stage++; |
| gatt_cl_start_config_ccc(p_clcb); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_cl_init_sr_status |
| * |
| * Description Restore status for trusted GATT Server device |
| * |
| * Returns none |
| * |
| ******************************************************************************/ |
| void gatt_cl_init_sr_status(tGATT_TCB& tcb) { |
| tcb.sr_supp_feat = btif_storage_get_sr_supp_feat(tcb.peer_bda); |
| |
| if (tcb.sr_supp_feat & BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK) |
| bluetooth::eatt::EattExtension::AddFromStorage(tcb.peer_bda); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_cl_read_sr_supp_feat_req |
| * |
| * Description Read remote device supported GATT feature mask. |
| * |
| * Returns bool |
| * |
| ******************************************************************************/ |
| bool gatt_cl_read_sr_supp_feat_req( |
| const RawAddress& peer_bda, |
| base::OnceCallback<void(const RawAddress&, uint8_t)> cb) { |
| tGATT_PROFILE_CLCB* p_clcb; |
| tGATT_READ_PARAM param; |
| uint16_t conn_id; |
| |
| if (!cb) return false; |
| |
| VLOG(1) << __func__ << " BDA: " << peer_bda |
| << " read gatt supported features"; |
| |
| GATT_GetConnIdIfConnected(gatt_cb.gatt_if, peer_bda, &conn_id, |
| BT_TRANSPORT_LE); |
| if (conn_id == GATT_INVALID_CONN_ID) return false; |
| |
| p_clcb = gatt_profile_find_clcb_by_conn_id(conn_id); |
| if (!p_clcb) { |
| p_clcb = gatt_profile_clcb_alloc(conn_id, peer_bda, BT_TRANSPORT_LE); |
| } |
| |
| if (!p_clcb) { |
| VLOG(1) << __func__ << " p_clcb is NULL " << loghex(conn_id); |
| return false; |
| } |
| |
| auto it = OngoingOps.find(conn_id); |
| if (it != OngoingOps.end()) { |
| LOG(ERROR) << __func__ << " There is ongoing operation for conn_id: " |
| << loghex(conn_id); |
| return false; |
| } |
| |
| memset(¶m, 0, sizeof(tGATT_READ_PARAM)); |
| |
| param.service.s_handle = 1; |
| param.service.e_handle = 0xFFFF; |
| param.service.auth_req = 0; |
| |
| param.service.uuid = bluetooth::Uuid::From16Bit(GATT_UUID_SERVER_SUP_FEAT); |
| |
| if (GATTC_Read(conn_id, GATT_READ_BY_TYPE, ¶m) != GATT_SUCCESS) { |
| LOG(ERROR) << __func__ << " Read GATT Support features GATT_Read Failed"; |
| return false; |
| } |
| |
| gatt_op_cb_data cb_data; |
| cb_data.cb = std::move(cb); |
| cb_data.op_uuid = GATT_UUID_SERVER_SUP_FEAT; |
| OngoingOps[conn_id] = std::move(cb_data); |
| |
| return true; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_profile_get_eatt_support |
| * |
| * Description Check if EATT is supported with remote device. |
| * |
| * Returns if EATT is supported. |
| * |
| ******************************************************************************/ |
| bool gatt_profile_get_eatt_support(const RawAddress& remote_bda) { |
| uint16_t conn_id; |
| |
| VLOG(1) << __func__ << " BDA: " << remote_bda << " read GATT support"; |
| |
| GATT_GetConnIdIfConnected(gatt_cb.gatt_if, remote_bda, &conn_id, |
| BT_TRANSPORT_LE); |
| |
| /* This read is important only when connected */ |
| if (conn_id == GATT_INVALID_CONN_ID) return false; |
| |
| /* Get tcb info */ |
| uint8_t tcb_idx = GATT_GET_TCB_IDX(conn_id); |
| tGATT_TCB& tcb = gatt_cb.tcb[tcb_idx]; |
| return tcb.sr_supp_feat & BLE_GATT_SVR_SUP_FEAT_EATT_BITMASK; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_sr_is_robust_caching_enabled |
| * |
| * Description Check if Robust Caching is enabled on server side. |
| * |
| * Returns true if enabled in gd flag, otherwise false |
| * |
| ******************************************************************************/ |
| static bool gatt_sr_is_robust_caching_enabled() { |
| return bluetooth::common::init_flags::gatt_robust_caching_is_enabled(); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_sr_is_cl_robust_caching_supported |
| * |
| * Description Check if Robust Caching is supported for the connection |
| * |
| * Returns true if enabled by client side, otherwise false |
| * |
| ******************************************************************************/ |
| static bool gatt_sr_is_cl_robust_caching_supported(tGATT_TCB& tcb) { |
| // if robust caching is not enabled, should always return false |
| if (!gatt_sr_is_robust_caching_enabled()) return false; |
| return (tcb.cl_supp_feat & BLE_GATT_CL_SUP_FEAT_CACHING_BITMASK); |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_sr_is_cl_change_aware |
| * |
| * Description Check if the connection is change-aware |
| * |
| * Returns true if change aware, otherwise false |
| * |
| ******************************************************************************/ |
| bool gatt_sr_is_cl_change_aware(tGATT_TCB& tcb) { |
| // if robust caching is not supported, should always return true by default |
| if (!gatt_sr_is_cl_robust_caching_supported(tcb)) return true; |
| return tcb.is_robust_cache_change_aware; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_sr_init_cl_status |
| * |
| * Description Restore status for trusted device |
| * |
| * Returns none |
| * |
| ******************************************************************************/ |
| void gatt_sr_init_cl_status(tGATT_TCB& tcb) { |
| tcb.cl_supp_feat = btif_storage_get_gatt_cl_supp_feat(tcb.peer_bda); |
| // This is used to reset bit when robust caching is disabled |
| if (!gatt_sr_is_robust_caching_enabled()) { |
| tcb.cl_supp_feat &= ~BLE_GATT_CL_SUP_FEAT_CACHING_BITMASK; |
| } |
| |
| if (gatt_sr_is_cl_robust_caching_supported(tcb)) { |
| Octet16 stored_hash = btif_storage_get_gatt_cl_db_hash(tcb.peer_bda); |
| tcb.is_robust_cache_change_aware = (stored_hash == gatt_cb.database_hash); |
| } else { |
| // set default value for untrusted device |
| tcb.is_robust_cache_change_aware = true; |
| } |
| |
| LOG(INFO) << __func__ << ": bda=" << tcb.peer_bda |
| << ", cl_supp_feat=" << loghex(tcb.cl_supp_feat) |
| << ", aware=" << tcb.is_robust_cache_change_aware; |
| } |
| |
| /******************************************************************************* |
| * |
| * Function gatt_sr_update_cl_status |
| * |
| * Description Update change-aware status for the remote device |
| * |
| * Returns none |
| * |
| ******************************************************************************/ |
| void gatt_sr_update_cl_status(tGATT_TCB& tcb, bool chg_aware) { |
| // if robust caching is not supported, do nothing |
| if (!gatt_sr_is_cl_robust_caching_supported(tcb)) return; |
| |
| // only when client status is changed from change-unaware to change-aware, we |
| // can then store database hash into btif_storage |
| if (!tcb.is_robust_cache_change_aware && chg_aware) { |
| btif_storage_set_gatt_cl_db_hash(tcb.peer_bda, gatt_cb.database_hash); |
| } |
| |
| // only when the status is changed, print the log |
| if (tcb.is_robust_cache_change_aware != chg_aware) { |
| LOG(INFO) << __func__ << ": bda=" << tcb.peer_bda |
| << ", chg_aware=" << chg_aware; |
| } |
| |
| tcb.is_robust_cache_change_aware = chg_aware; |
| } |
| |
| /* handle request for reading database hash */ |
| static tGATT_STATUS gatt_sr_read_db_hash(uint16_t conn_id, |
| tGATT_VALUE* p_value) { |
| LOG(INFO) << __func__ << ": conn_id=" << loghex(conn_id); |
| |
| uint8_t* p = p_value->value; |
| Octet16& db_hash = gatt_cb.database_hash; |
| ARRAY_TO_STREAM(p, db_hash.data(), (uint16_t)db_hash.size()); |
| p_value->len = (uint16_t)db_hash.size(); |
| |
| // Every time when database hash is requested, reset flag. |
| uint8_t tcb_idx = GATT_GET_TCB_IDX(conn_id); |
| gatt_sr_update_cl_status(gatt_cb.tcb[tcb_idx], /* chg_aware= */ true); |
| return GATT_SUCCESS; |
| } |
| |
| /* handle request for reading client supported features */ |
| static tGATT_STATUS gatt_sr_read_cl_supp_feat(uint16_t conn_id, |
| tGATT_VALUE* p_value) { |
| // Get tcb info |
| uint8_t tcb_idx = GATT_GET_TCB_IDX(conn_id); |
| tGATT_TCB& tcb = gatt_cb.tcb[tcb_idx]; |
| |
| uint8_t* p = p_value->value; |
| UINT8_TO_STREAM(p, tcb.cl_supp_feat); |
| p_value->len = 1; |
| |
| return GATT_SUCCESS; |
| } |
| |
| /* handle request for writing client supported features */ |
| static tGATT_STATUS gatt_sr_write_cl_supp_feat(uint16_t conn_id, |
| tGATT_WRITE_REQ* p_data) { |
| std::list<uint8_t> tmp; |
| uint16_t len = p_data->len; |
| uint8_t value, *p = p_data->value; |
| // Read all octets into list |
| while (len > 0) { |
| STREAM_TO_UINT8(value, p); |
| tmp.push_back(value); |
| len--; |
| } |
| // Remove trailing zero octets |
| while (!tmp.empty()) { |
| if (tmp.back() != 0x00) break; |
| tmp.pop_back(); |
| } |
| |
| // Get tcb info |
| uint8_t tcb_idx = GATT_GET_TCB_IDX(conn_id); |
| tGATT_TCB& tcb = gatt_cb.tcb[tcb_idx]; |
| |
| std::list<uint8_t> feature_list; |
| feature_list.push_back(tcb.cl_supp_feat); |
| |
| // If input length is zero, return value_not_allowed |
| if (tmp.empty()) { |
| LOG(INFO) << __func__ << ": zero length, conn_id=" << loghex(conn_id) |
| << ", bda=" << tcb.peer_bda; |
| return GATT_VALUE_NOT_ALLOWED; |
| } |
| // if original length is longer than new one, it must be the bit reset case. |
| if (feature_list.size() > tmp.size()) { |
| LOG(INFO) << __func__ << ": shorter length, conn_id=" << loghex(conn_id) |
| << ", bda=" << tcb.peer_bda; |
| return GATT_VALUE_NOT_ALLOWED; |
| } |
| // new length is longer or equals to the original, need to check bits |
| // one by one. Here we use bit-wise operation. |
| // 1. Use XOR to locate the change bit, val_xor is the change bit mask |
| // 2. Use AND for val_xor and *it_new to get val_and |
| // 3. If val_and != val_xor, it means the change is from 1 to 0 |
| auto it_old = feature_list.cbegin(); |
| auto it_new = tmp.cbegin(); |
| for (; it_old != feature_list.cend(); it_old++, it_new++) { |
| uint8_t val_xor = *it_old ^ *it_new; |
| uint8_t val_and = val_xor & *it_new; |
| if (val_and != val_xor) { |
| LOG(INFO) << __func__ |
| << ": bit cannot be reset, conn_id=" << loghex(conn_id) |
| << ", bda=" << tcb.peer_bda; |
| return GATT_VALUE_NOT_ALLOWED; |
| } |
| } |
| |
| // get current robust caching status before setting new one |
| bool curr_caching_state = gatt_sr_is_cl_robust_caching_supported(tcb); |
| |
| tcb.cl_supp_feat = tmp.front(); |
| if (!gatt_sr_is_robust_caching_enabled()) { |
| // remove robust caching bit |
| tcb.cl_supp_feat &= ~BLE_GATT_CL_SUP_FEAT_CACHING_BITMASK; |
| LOG(INFO) << __func__ |
| << ": reset robust caching bit, conn_id=" << loghex(conn_id) |
| << ", bda=" << tcb.peer_bda; |
| } |
| // TODO(hylo): save data as byte array |
| btif_storage_set_gatt_cl_supp_feat(tcb.peer_bda, tcb.cl_supp_feat); |
| |
| // get new robust caching status after setting new one |
| bool new_caching_state = gatt_sr_is_cl_robust_caching_supported(tcb); |
| // only when the first time robust caching request, print the log |
| if (!curr_caching_state && new_caching_state) { |
| LOG(INFO) << __func__ << ": robust caching enabled by client" |
| << ", conn_id=" << loghex(conn_id); |
| } |
| |
| return GATT_SUCCESS; |
| } |
