/******************************************************************************
*
* Copyright (C) 2008-2014 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 ATT protocol functions
*
******************************************************************************/
#include "bt_target.h"
#if BLE_INCLUDED == TRUE
#include "gatt_int.h"
#include "l2c_api.h"
#define GATT_HDR_FIND_TYPE_VALUE_LEN 21
#define GATT_OP_CODE_SIZE 1
/**********************************************************************
** ATT protocl message building utility *
***********************************************************************/
/*******************************************************************************
**
** Function attp_build_mtu_exec_cmd
**
** Description Build a exchange MTU request
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_mtu_cmd(UINT8 op_code, UINT16 rx_mtu)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + GATT_HDR_SIZE + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, op_code);
UINT16_TO_STREAM (p, rx_mtu);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = GATT_HDR_SIZE; /* opcode + 2 bytes mtu */
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_exec_write_cmd
**
** Description Build a execute write request or response.
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_exec_write_cmd (UINT8 op_code, UINT8 flag)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
if ((p_buf = (BT_HDR *)GKI_getpoolbuf(GATT_BUF_POOL_ID)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = GATT_OP_CODE_SIZE;
UINT8_TO_STREAM (p, op_code);
if (op_code == GATT_REQ_EXEC_WRITE)
{
flag &= GATT_PREP_WRITE_EXEC;
UINT8_TO_STREAM (p, flag);
p_buf->len += 1;
}
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_err_cmd
**
** Description Build a exchange MTU request
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_err_cmd(UINT8 cmd_code, UINT16 err_handle, UINT8 reason)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + L2CAP_MIN_OFFSET + 5)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, GATT_RSP_ERROR);
UINT8_TO_STREAM (p, cmd_code);
UINT16_TO_STREAM(p, err_handle);
UINT8_TO_STREAM (p, reason);
p_buf->offset = L2CAP_MIN_OFFSET;
/* GATT_HDR_SIZE (1B ERR_RSP op code+ 2B handle) + 1B cmd_op_code + 1B status */
p_buf->len = GATT_HDR_SIZE + 1 + 1;
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_browse_cmd
**
** Description Build a read information request or read by type request
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_browse_cmd(UINT8 op_code, UINT16 s_hdl, UINT16 e_hdl, tBT_UUID uuid)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + 8 + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
/* Describe the built message location and size */
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = GATT_OP_CODE_SIZE + 4;
UINT8_TO_STREAM (p, op_code);
UINT16_TO_STREAM (p, s_hdl);
UINT16_TO_STREAM (p, e_hdl);
p_buf->len += gatt_build_uuid_to_stream(&p, uuid);
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_read_handles_cmd
**
** Description Build a read by type and value request.
**
** Returns pointer to the command buffer.
**
*******************************************************************************/
BT_HDR *attp_build_read_by_type_value_cmd (UINT16 payload_size, tGATT_FIND_TYPE_VALUE *p_value_type)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
UINT16 len = p_value_type->value_len;
if ((p_buf = (BT_HDR *)GKI_getbuf((UINT16)(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET))) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = 5; /* opcode + s_handle + e_handle */
UINT8_TO_STREAM (p, GATT_REQ_FIND_TYPE_VALUE);
UINT16_TO_STREAM (p, p_value_type->s_handle);
UINT16_TO_STREAM (p, p_value_type->e_handle);
p_buf->len += gatt_build_uuid_to_stream(&p, p_value_type->uuid);
if (p_value_type->value_len + p_buf->len > payload_size )
len = payload_size - p_buf->len;
memcpy (p, p_value_type->value, len);
p_buf->len += len;
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_read_multi_cmd
**
** Description Build a read multiple request
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_read_multi_cmd(UINT16 payload_size, UINT16 num_handle, UINT16 *p_handle)
{
BT_HDR *p_buf = NULL;
UINT8 *p, i = 0;
if ((p_buf = (BT_HDR *)GKI_getbuf((UINT16)(sizeof(BT_HDR) + num_handle * 2 + 1 + L2CAP_MIN_OFFSET))) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = 1;
UINT8_TO_STREAM (p, GATT_REQ_READ_MULTI);
for (i = 0; i < num_handle && p_buf->len + 2 <= payload_size; i ++)
{
UINT16_TO_STREAM (p, *(p_handle + i));
p_buf->len += 2;
}
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_handle_cmd
**
** Description Build a read /read blob request
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_handle_cmd(UINT8 op_code, UINT16 handle, UINT16 offset)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + 5 + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
p_buf->offset = L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, op_code);
p_buf->len = 1;
UINT16_TO_STREAM (p, handle);
p_buf->len += 2;
if (op_code == GATT_REQ_READ_BLOB)
{
UINT16_TO_STREAM (p, offset);
p_buf->len += 2;
}
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_opcode_cmd
**
** Description Build a request/response with opcode only.
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_opcode_cmd(UINT8 op_code)
{
BT_HDR *p_buf = NULL;
UINT8 *p;
if ((p_buf = (BT_HDR *)GKI_getbuf(sizeof(BT_HDR) + 1 + L2CAP_MIN_OFFSET)) != NULL)
{
p = (UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
p_buf->offset = L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, op_code);
p_buf->len = 1;
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_build_value_cmd
**
** Description Build a attribute value request
**
** Returns None.
**
*******************************************************************************/
BT_HDR *attp_build_value_cmd (UINT16 payload_size, UINT8 op_code, UINT16 handle,
UINT16 offset, UINT16 len, UINT8 *p_data)
{
BT_HDR *p_buf = NULL;
UINT8 *p, *pp, pair_len, *p_pair_len;
if ((p_buf = (BT_HDR *)GKI_getbuf((UINT16)(sizeof(BT_HDR) + payload_size + L2CAP_MIN_OFFSET))) != NULL)
{
p = pp =(UINT8 *)(p_buf + 1) + L2CAP_MIN_OFFSET;
UINT8_TO_STREAM (p, op_code);
p_buf->offset = L2CAP_MIN_OFFSET;
p_buf->len = 1;
if (op_code == GATT_RSP_READ_BY_TYPE)
{
p_pair_len = p;
pair_len = len + 2;
UINT8_TO_STREAM (p, pair_len);
p_buf->len += 1;
}
if (op_code != GATT_RSP_READ_BLOB && op_code != GATT_RSP_READ)
{
UINT16_TO_STREAM (p, handle);
p_buf->len += 2;
}
if (op_code == GATT_REQ_PREPARE_WRITE ||op_code == GATT_RSP_PREPARE_WRITE )
{
UINT16_TO_STREAM (p, offset);
p_buf->len += 2;
}
if (len > 0 && p_data != NULL)
{
/* ensure data not exceed MTU size */
if (payload_size - p_buf->len < len)
{
len = payload_size - p_buf->len;
/* update handle value pair length */
if (op_code == GATT_RSP_READ_BY_TYPE)
*p_pair_len = (len + 2);
GATT_TRACE_WARNING("attribute value too long, to be truncated to %d", len);
}
ARRAY_TO_STREAM (p, p_data, len);
p_buf->len += len;
}
}
return p_buf;
}
/*******************************************************************************
**
** Function attp_send_msg_to_l2cap
**
** Description Send message to L2CAP.
**
*******************************************************************************/
tGATT_STATUS attp_send_msg_to_l2cap(tGATT_TCB *p_tcb, BT_HDR *p_toL2CAP)
{
UINT16 l2cap_ret;
if (p_tcb->att_lcid == L2CAP_ATT_CID)
l2cap_ret = L2CA_SendFixedChnlData (L2CAP_ATT_CID, p_tcb->peer_bda, p_toL2CAP);
else
l2cap_ret = (UINT16) L2CA_DataWrite (p_tcb->att_lcid, p_toL2CAP);
if (l2cap_ret == L2CAP_DW_FAILED)
{
GATT_TRACE_ERROR("ATT failed to pass msg:0x%0x to L2CAP",
*((UINT8 *)(p_toL2CAP + 1) + p_toL2CAP->offset));
return GATT_INTERNAL_ERROR;
}
else if (l2cap_ret == L2CAP_DW_CONGESTED)
{
GATT_TRACE_DEBUG("ATT congested, message accepted");
return GATT_CONGESTED;
}
return GATT_SUCCESS;
}
/*******************************************************************************
**
** Function attp_build_sr_msg
**
** Description Build ATT Server PDUs.
**
*******************************************************************************/
BT_HDR *attp_build_sr_msg(tGATT_TCB *p_tcb, UINT8 op_code, tGATT_SR_MSG *p_msg)
{
BT_HDR *p_cmd = NULL;
UINT16 offset = 0;
switch (op_code)
{
case GATT_RSP_READ_BLOB:
case GATT_RSP_PREPARE_WRITE:
GATT_TRACE_EVENT ("ATT_RSP_READ_BLOB/GATT_RSP_PREPARE_WRITE: len = %d offset = %d",
p_msg->attr_value.len, p_msg->attr_value.offset);
offset = p_msg->attr_value.offset;
/* Coverity: [FALSE-POSITIVE error] intended fall through */
/* Missing break statement between cases in switch statement */
/* fall through */
case GATT_RSP_READ_BY_TYPE:
case GATT_RSP_READ:
case GATT_HANDLE_VALUE_NOTIF:
case GATT_HANDLE_VALUE_IND:
p_cmd = attp_build_value_cmd(p_tcb->payload_size,
op_code,
p_msg->attr_value.handle,
offset,
p_msg->attr_value.len,
p_msg->attr_value.value);
break;
case GATT_RSP_WRITE:
p_cmd = attp_build_opcode_cmd(op_code);
break;
case GATT_RSP_ERROR:
p_cmd = attp_build_err_cmd(p_msg->error.cmd_code, p_msg->error.handle, p_msg->error.reason);
break;
case GATT_RSP_EXEC_WRITE:
p_cmd = attp_build_exec_write_cmd(op_code, 0);
break;
case GATT_RSP_MTU:
p_cmd = attp_build_mtu_cmd(op_code, p_msg->mtu);
break;
default:
GATT_TRACE_DEBUG("attp_build_sr_msg: unknown op code = %d", op_code);
break;
}
if (!p_cmd)
GATT_TRACE_ERROR("No resources");
return p_cmd;
}
/*******************************************************************************
**
** Function attp_send_sr_msg
**
** Description This function sends the server response or indication message
** to client.
**
** Parameter p_tcb: pointer to the connecton control block.
** p_msg: pointer to message parameters structure.
**
** Returns GATT_SUCCESS if sucessfully sent; otherwise error code.
**
**
*******************************************************************************/
tGATT_STATUS attp_send_sr_msg (tGATT_TCB *p_tcb, BT_HDR *p_msg)
{
tGATT_STATUS cmd_sent = GATT_NO_RESOURCES;
if (p_tcb != NULL)
{
if (p_msg != NULL)
{
p_msg->offset = L2CAP_MIN_OFFSET;
cmd_sent = attp_send_msg_to_l2cap (p_tcb, p_msg);
}
}
return cmd_sent;
}
/*******************************************************************************
**
** Function attp_cl_send_cmd
**
** Description Send a ATT command or enqueue it.
**
** Returns GATT_SUCCESS if command sent
** GATT_CONGESTED if command sent but channel congested
** GATT_CMD_STARTED if command queue up in GATT
** GATT_ERROR if command sending failure
**
*******************************************************************************/
tGATT_STATUS attp_cl_send_cmd(tGATT_TCB *p_tcb, UINT16 clcb_idx, UINT8 cmd_code, BT_HDR *p_cmd)
{
tGATT_STATUS att_ret = GATT_SUCCESS;
if (p_tcb != NULL)
{
cmd_code &= ~GATT_AUTH_SIGN_MASK;
/* no pending request or value confirmation */
if (p_tcb->pending_cl_req == p_tcb->next_slot_inq ||
cmd_code == GATT_HANDLE_VALUE_CONF)
{
att_ret = attp_send_msg_to_l2cap(p_tcb, p_cmd);
if (att_ret == GATT_CONGESTED || att_ret == GATT_SUCCESS)
{
/* do not enq cmd if handle value confirmation or set request */
if (cmd_code != GATT_HANDLE_VALUE_CONF && cmd_code != GATT_CMD_WRITE)
{
gatt_start_rsp_timer (clcb_idx);
gatt_cmd_enq(p_tcb, clcb_idx, FALSE, cmd_code, NULL);
}
}
else
att_ret = GATT_INTERNAL_ERROR;
}
else
{
att_ret = GATT_CMD_STARTED;
gatt_cmd_enq(p_tcb, clcb_idx, TRUE, cmd_code, p_cmd);
}
}
else
att_ret = GATT_ERROR;
return att_ret;
}
/*******************************************************************************
**
** Function attp_send_cl_msg
**
** Description This function sends the client request or confirmation message
** to server.
**
** Parameter p_tcb: pointer to the connectino control block.
** clcb_idx: clcb index
** op_code: message op code.
** p_msg: pointer to message parameters structure.
**
** Returns GATT_SUCCESS if sucessfully sent; otherwise error code.
**
**
*******************************************************************************/
tGATT_STATUS attp_send_cl_msg (tGATT_TCB *p_tcb, UINT16 clcb_idx, UINT8 op_code, tGATT_CL_MSG *p_msg)
{
tGATT_STATUS status = GATT_NO_RESOURCES;
BT_HDR *p_cmd = NULL;
UINT16 offset = 0, handle;
if (p_tcb != NULL)
{
switch (op_code)
{
case GATT_REQ_MTU:
if (p_msg->mtu <= GATT_MAX_MTU_SIZE)
{
p_tcb->payload_size = p_msg->mtu;
p_cmd = attp_build_mtu_cmd(GATT_REQ_MTU, p_msg->mtu);
}
else
status = GATT_ILLEGAL_PARAMETER;
break;
case GATT_REQ_FIND_INFO:
case GATT_REQ_READ_BY_TYPE:
case GATT_REQ_READ_BY_GRP_TYPE:
if (GATT_HANDLE_IS_VALID (p_msg->browse.s_handle) &&
GATT_HANDLE_IS_VALID (p_msg->browse.e_handle) &&
p_msg->browse.s_handle <= p_msg->browse.e_handle)
{
p_cmd = attp_build_browse_cmd(op_code,
p_msg->browse.s_handle,
p_msg->browse.e_handle,
p_msg->browse.uuid);
}
else
status = GATT_ILLEGAL_PARAMETER;
break;
case GATT_REQ_READ_BLOB:
offset = p_msg->read_blob.offset;
/* fall through */
case GATT_REQ_READ:
handle = (op_code == GATT_REQ_READ) ? p_msg->handle: p_msg->read_blob.handle;
/* handle checking */
if (GATT_HANDLE_IS_VALID (handle))
{
p_cmd = attp_build_handle_cmd(op_code, handle, offset);
}
else
status = GATT_ILLEGAL_PARAMETER;
break;
case GATT_HANDLE_VALUE_CONF:
p_cmd = attp_build_opcode_cmd(op_code);
break;
case GATT_REQ_PREPARE_WRITE:
offset = p_msg->attr_value.offset;
/* fall through */
case GATT_REQ_WRITE:
case GATT_CMD_WRITE:
case GATT_SIGN_CMD_WRITE:
if (GATT_HANDLE_IS_VALID (p_msg->attr_value.handle))
{
p_cmd = attp_build_value_cmd (p_tcb->payload_size,
op_code, p_msg->attr_value.handle,
offset,
p_msg->attr_value.len,
p_msg->attr_value.value);
}
else
status = GATT_ILLEGAL_PARAMETER;
break;
case GATT_REQ_EXEC_WRITE:
p_cmd = attp_build_exec_write_cmd(op_code, p_msg->exec_write);
break;
case GATT_REQ_FIND_TYPE_VALUE:
p_cmd = attp_build_read_by_type_value_cmd(p_tcb->payload_size, &p_msg->find_type_value);
break;
case GATT_REQ_READ_MULTI:
p_cmd = attp_build_read_multi_cmd(p_tcb->payload_size,
p_msg->read_multi.num_handles,
p_msg->read_multi.handles);
break;
default:
break;
}
if (p_cmd != NULL)
status = attp_cl_send_cmd(p_tcb, clcb_idx, op_code, p_cmd);
}
else
{
GATT_TRACE_ERROR("Peer device not connected");
}
return status;
}
#endif