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v811_spc009/system/bt/stack/gatt/gatt_attr.cc

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/******************************************************************************
*
* 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"
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) {
uint16_t service_handle = 0;
/* 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));
service_handle = service[0].attribute_handle;
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(&param, 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, &param);
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(&param, 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, &param) != 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;
}
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