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esp-idf/components/bt/bluedroid/stack/smp/smp_l2c.c
zhiweijian f74b041288 Component/bt: fix memory leak in security server
2018-08-25 15:47:47 +00:00

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/******************************************************************************
*
* Copyright (C) 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This file contains functions for the SMP L2Cap interface
*
******************************************************************************/
#include "common/bt_target.h"
#include "osi/allocator.h"
#if SMP_INCLUDED == TRUE
#include <string.h>
#include "stack/btm_ble_api.h"
#include "stack/l2c_api.h"
#include "smp_int.h"
static void smp_tx_complete_callback(UINT16 cid, UINT16 num_pkt);
static void smp_connect_callback(UINT16 channel, BD_ADDR bd_addr, BOOLEAN connected, UINT16 reason,
tBT_TRANSPORT transport);
static void smp_data_received(UINT16 channel, BD_ADDR bd_addr, BT_HDR *p_buf);
#if (CLASSIC_BT_INCLUDED == TRUE)
static void smp_br_connect_callback(UINT16 channel, BD_ADDR bd_addr, BOOLEAN connected, UINT16 reason,
tBT_TRANSPORT transport);
static void smp_br_data_received(UINT16 channel, BD_ADDR bd_addr, BT_HDR *p_buf);
#endif ///CLASSIC_BT_INCLUDED == TRUE
/*******************************************************************************
**
** Function smp_l2cap_if_init
**
** Description This function is called during the SMP task startup
** to register interface functions with L2CAP.
**
*******************************************************************************/
void smp_l2cap_if_init (void)
{
tL2CAP_FIXED_CHNL_REG fixed_reg;
SMP_TRACE_EVENT ("SMDBG l2c %s", __func__);
fixed_reg.fixed_chnl_opts.mode = L2CAP_FCR_BASIC_MODE;
fixed_reg.fixed_chnl_opts.max_transmit = 0;
fixed_reg.fixed_chnl_opts.rtrans_tout = 0;
fixed_reg.fixed_chnl_opts.mon_tout = 0;
fixed_reg.fixed_chnl_opts.mps = 0;
fixed_reg.fixed_chnl_opts.tx_win_sz = 0;
fixed_reg.pL2CA_FixedConn_Cb = smp_connect_callback;
fixed_reg.pL2CA_FixedData_Cb = smp_data_received;
fixed_reg.pL2CA_FixedTxComplete_Cb = smp_tx_complete_callback;
fixed_reg.pL2CA_FixedCong_Cb = NULL; /* do not handle congestion on this channel */
fixed_reg.default_idle_tout = 0; /* set 0 seconds timeout, 0xffff default idle timeout.
This timeout is used to wait for the end of the pairing
and then make a disconnect request, setting a larger value
will cause the disconnect event to go back up for a long time.
Set to 0 will be disconnected directly, and it will come up
pairing failure, so it will not cause adverse effects. */
L2CA_RegisterFixedChannel (L2CAP_SMP_CID, &fixed_reg);
#if (CLASSIC_BT_INCLUDED == TRUE)
fixed_reg.pL2CA_FixedConn_Cb = smp_br_connect_callback;
fixed_reg.pL2CA_FixedData_Cb = smp_br_data_received;
L2CA_RegisterFixedChannel (L2CAP_SMP_BR_CID, &fixed_reg);
#endif ///CLASSIC_BT_INCLUDED == TRUE
}
/*******************************************************************************
**
** Function smp_connect_callback
**
** Description This callback function is called by L2CAP to indicate that
** SMP channel is
** connected (conn = TRUE)/disconnected (conn = FALSE).
**
*******************************************************************************/
static void smp_connect_callback (UINT16 channel, BD_ADDR bd_addr, BOOLEAN connected, UINT16 reason,
tBT_TRANSPORT transport)
{
tSMP_CB *p_cb = &smp_cb;
tSMP_INT_DATA int_data;
BD_ADDR dummy_bda = {0};
SMP_TRACE_EVENT ("SMDBG l2c %s\n", __FUNCTION__);
if (transport == BT_TRANSPORT_BR_EDR || memcmp(bd_addr, dummy_bda, BD_ADDR_LEN) == 0) {
return;
}
if(!connected && &p_cb->rsp_timer_ent) {
//free timer
btu_free_timer(&p_cb->rsp_timer_ent);
}
if (memcmp(bd_addr, p_cb->pairing_bda, BD_ADDR_LEN) == 0) {
SMP_TRACE_EVENT ("%s() for pairing BDA: %08x%04x Event: %s\n",
__FUNCTION__,
(bd_addr[0] << 24) + (bd_addr[1] << 16) + (bd_addr[2] << 8) + bd_addr[3],
(bd_addr[4] << 8) + bd_addr[5],
(connected) ? "connected" : "disconnected");
if (connected) {
if (!p_cb->connect_initialized) {
p_cb->connect_initialized = TRUE;
/* initiating connection established */
p_cb->role = L2CA_GetBleConnRole(bd_addr);
/* initialize local i/r key to be default keys */
p_cb->local_r_key = p_cb->local_i_key = SMP_SEC_DEFAULT_KEY;
p_cb->loc_auth_req = p_cb->peer_auth_req = SMP_DEFAULT_AUTH_REQ;
p_cb->cb_evt = SMP_IO_CAP_REQ_EVT;
smp_sm_event(p_cb, SMP_L2CAP_CONN_EVT, NULL);
}
} else {
int_data.reason = reason;
/* Disconnected while doing security */
smp_sm_event(p_cb, SMP_L2CAP_DISCONN_EVT, &int_data);
}
}
}
/*******************************************************************************
**
** Function smp_data_received
**
** Description This function is called when data is received from L2CAP on
** SMP channel.
**
**
** Returns void
**
*******************************************************************************/
static void smp_data_received(UINT16 channel, BD_ADDR bd_addr, BT_HDR *p_buf)
{
tSMP_CB *p_cb = &smp_cb;
UINT8 *p = (UINT8 *)(p_buf + 1) + p_buf->offset;
UINT8 cmd ;
SMP_TRACE_EVENT ("\nSMDBG l2c %s\n", __FUNCTION__);
STREAM_TO_UINT8(cmd, p);
/* sanity check */
if ((SMP_OPCODE_MAX < cmd) || (SMP_OPCODE_MIN > cmd)) {
SMP_TRACE_WARNING( "Ignore received command with RESERVED code 0x%02x\n", cmd);
osi_free (p_buf);
return;
}
/* reject the pairing request if there is an on-going SMP pairing */
if (SMP_OPCODE_PAIRING_REQ == cmd || SMP_OPCODE_SEC_REQ == cmd) {
if ((p_cb->state == SMP_STATE_IDLE) && (p_cb->br_state == SMP_BR_STATE_IDLE) &&
!(p_cb->flags & SMP_PAIR_FLAGS_WE_STARTED_DD)) {
p_cb->role = L2CA_GetBleConnRole(bd_addr);
memcpy(&p_cb->pairing_bda[0], bd_addr, BD_ADDR_LEN);
} else if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN)) {
osi_free (p_buf);
smp_reject_unexpected_pairing_command(bd_addr);
return;
}
/* else, out of state pairing request/security request received, passed into SM */
}
if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN) == 0) {
btu_stop_timer (&p_cb->rsp_timer_ent);
btu_start_timer (&p_cb->rsp_timer_ent, BTU_TTYPE_SMP_PAIRING_CMD,
SMP_WAIT_FOR_RSP_TOUT);
if (cmd == SMP_OPCODE_CONFIRM) {
SMP_TRACE_DEBUG ("in %s cmd = 0x%02x, peer_auth_req = 0x%02x,"
"loc_auth_req = 0x%02x\n",
__FUNCTION__, cmd, p_cb->peer_auth_req, p_cb->loc_auth_req);
if ((p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) &&
(p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT)) {
cmd = SMP_OPCODE_PAIR_COMMITM;
}
}
p_cb->rcvd_cmd_code = cmd;
p_cb->rcvd_cmd_len = (UINT8) p_buf->len;
smp_sm_event(p_cb, cmd, p);
}
osi_free (p_buf);
}
/*******************************************************************************
**
** Function smp_tx_complete_callback
**
** Description SMP channel tx complete callback
**
*******************************************************************************/
static void smp_tx_complete_callback (UINT16 cid, UINT16 num_pkt)
{
tSMP_CB *p_cb = &smp_cb;
if (p_cb->total_tx_unacked >= num_pkt) {
p_cb->total_tx_unacked -= num_pkt;
} else {
SMP_TRACE_ERROR("Unexpected %s: num_pkt = %d", __func__, num_pkt);
}
UINT8 reason = SMP_SUCCESS;
if (p_cb->total_tx_unacked == 0 && p_cb->wait_for_authorization_complete) {
if (cid == L2CAP_SMP_CID) {
smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &reason);
} else {
smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &reason);
}
}
}
/*******************************************************************************
**
** Function smp_br_connect_callback
**
** Description This callback function is called by L2CAP to indicate that
** SMP BR channel is
** connected (conn = TRUE)/disconnected (conn = FALSE).
**
*******************************************************************************/
#if (CLASSIC_BT_INCLUDED == TRUE)
static void smp_br_connect_callback(UINT16 channel, BD_ADDR bd_addr, BOOLEAN connected,
UINT16 reason, tBT_TRANSPORT transport)
{
tSMP_CB *p_cb = &smp_cb;
tSMP_INT_DATA int_data;
SMP_TRACE_EVENT ("%s", __func__);
if (transport != BT_TRANSPORT_BR_EDR) {
SMP_TRACE_EVENT ("%s is called on unexpected transport %d\n",
__func__, transport);
return;
}
if (!(memcmp(bd_addr, p_cb->pairing_bda, BD_ADDR_LEN) == 0)) {
return;
}
SMP_TRACE_EVENT ("%s for pairing BDA: %08x%04x Event: %s\n",
__func__,
(bd_addr[0] << 24) + (bd_addr[1] << 16) + (bd_addr[2] << 8) + bd_addr[3],
(bd_addr[4] << 8) + bd_addr[5],
(connected) ? "connected" : "disconnected");
if (connected) {
if (!p_cb->connect_initialized) {
p_cb->connect_initialized = TRUE;
/* initialize local i/r key to be default keys */
p_cb->local_r_key = p_cb->local_i_key = SMP_BR_SEC_DEFAULT_KEY;
p_cb->loc_auth_req = p_cb->peer_auth_req = 0;
p_cb->cb_evt = SMP_BR_KEYS_REQ_EVT;
smp_br_state_machine_event(p_cb, SMP_BR_L2CAP_CONN_EVT, NULL);
}
} else {
int_data.reason = reason;
/* Disconnected while doing security */
smp_br_state_machine_event(p_cb, SMP_BR_L2CAP_DISCONN_EVT, &int_data);
}
}
/*******************************************************************************
**
** Function smp_br_data_received
**
** Description This function is called when data is received from L2CAP on
** SMP BR channel.
**
** Returns void
**
*******************************************************************************/
static void smp_br_data_received(UINT16 channel, BD_ADDR bd_addr, BT_HDR *p_buf)
{
tSMP_CB *p_cb = &smp_cb;
UINT8 *p = (UINT8 *)(p_buf + 1) + p_buf->offset;
UINT8 cmd ;
SMP_TRACE_EVENT ("SMDBG l2c %s\n", __func__);
STREAM_TO_UINT8(cmd, p);
/* sanity check */
if ((SMP_OPCODE_MAX < cmd) || (SMP_OPCODE_MIN > cmd)) {
SMP_TRACE_WARNING( "Ignore received command with RESERVED code 0x%02x", cmd);
osi_free(p_buf);
return;
}
/* reject the pairing request if there is an on-going SMP pairing */
if (SMP_OPCODE_PAIRING_REQ == cmd) {
if ((p_cb->state == SMP_STATE_IDLE) && (p_cb->br_state == SMP_BR_STATE_IDLE)) {
p_cb->role = HCI_ROLE_SLAVE;
p_cb->smp_over_br = TRUE;
memcpy(&p_cb->pairing_bda[0], bd_addr, BD_ADDR_LEN);
} else if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN)) {
osi_free (p_buf);
smp_reject_unexpected_pairing_command(bd_addr);
return;
}
/* else, out of state pairing request received, passed into State Machine */
}
if (memcmp(&bd_addr[0], p_cb->pairing_bda, BD_ADDR_LEN) == 0) {
btu_stop_timer (&p_cb->rsp_timer_ent);
btu_start_timer (&p_cb->rsp_timer_ent, BTU_TTYPE_SMP_PAIRING_CMD,
SMP_WAIT_FOR_RSP_TOUT);
p_cb->rcvd_cmd_code = cmd;
p_cb->rcvd_cmd_len = (UINT8) p_buf->len;
smp_br_state_machine_event(p_cb, cmd, p);
}
osi_free (p_buf);
}
#endif /* CLASSIC_BT_INCLUDED == TRUE */
#endif /* SMP_INCLUDED == TRUE */
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