/******************************************************************************
*
* Copyright 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 <cutils/log.h>
#include "bt_target.h"
#include <string.h>
#include "btm_ble_api.h"
#include "common/metrics.h"
#include "l2c_api.h"
#include "smp_int.h"
static void smp_tx_complete_callback(uint16_t cid, uint16_t num_pkt);
static void smp_connect_callback(uint16_t channel, const RawAddress& bd_addr,
bool connected, uint16_t reason,
tBT_TRANSPORT transport);
static void smp_data_received(uint16_t channel, const RawAddress& bd_addr,
BT_HDR* p_buf);
static void smp_br_connect_callback(uint16_t channel, const RawAddress& bd_addr,
bool connected, uint16_t reason,
tBT_TRANSPORT transport);
static void smp_br_data_received(uint16_t channel, const RawAddress& bd_addr,
BT_HDR* p_buf);
/*******************************************************************************
*
* 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 =
60; /* set 60 seconds timeout, 0xffff default idle timeout */
L2CA_RegisterFixedChannel(L2CAP_SMP_CID, &fixed_reg);
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);
}
/*******************************************************************************
*
* 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_t channel, const RawAddress& bd_addr,
bool connected, uint16_t reason,
tBT_TRANSPORT transport) {
tSMP_CB* p_cb = &smp_cb;
tSMP_INT_DATA int_data;
SMP_TRACE_EVENT("%s: SMDBG l2c: bd_addr=%s, p_cb->pairing_bda=%s", __func__,
bd_addr.ToString().c_str(),
p_cb->pairing_bda.ToString().c_str());
if (transport == BT_TRANSPORT_BR_EDR || bd_addr.IsEmpty()) return;
if (bd_addr == p_cb->pairing_bda) {
VLOG(2) << __func__ << " for pairing BDA: " << bd_addr
<< " Event: " << ((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_t channel, const RawAddress& bd_addr,
BT_HDR* p_buf) {
tSMP_CB* p_cb = &smp_cb;
uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
uint8_t cmd;
if (p_buf->len < 1) {
android_errorWriteLog(0x534e4554, "111215315");
SMP_TRACE_WARNING("%s: smp packet length %d too short: must be at least 1",
__func__, p_buf->len);
osi_free(p_buf);
return;
}
STREAM_TO_UINT8(cmd, p);
SMP_TRACE_EVENT("%s: SMDBG l2c, cmd=0x%x", __func__, cmd);
/* 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 || 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);
p_cb->pairing_bda = bd_addr;
} else if (bd_addr != p_cb->pairing_bda) {
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 (bd_addr == p_cb->pairing_bda) {
alarm_set_on_mloop(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
smp_rsp_timeout, NULL);
smp_log_metrics(p_cb->pairing_bda, false /* incoming */,
p_buf->data + p_buf->offset, p_buf->len);
if (cmd == SMP_OPCODE_CONFIRM) {
SMP_TRACE_DEBUG(
"in %s cmd = 0x%02x, peer_auth_req = 0x%02x,"
"loc_auth_req = 0x%02x",
__func__, 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_t)p_buf->len;
tSMP_INT_DATA smp_int_data;
smp_int_data.p_data = p;
smp_sm_event(p_cb, cmd, &smp_int_data);
}
osi_free(p_buf);
}
/*******************************************************************************
*
* Function smp_tx_complete_callback
*
* Description SMP channel tx complete callback
*
******************************************************************************/
static void smp_tx_complete_callback(uint16_t cid, uint16_t 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);
if (p_cb->total_tx_unacked == 0 && p_cb->wait_for_authorization_complete) {
tSMP_INT_DATA smp_int_data;
smp_int_data.status = SMP_SUCCESS;
if (cid == L2CAP_SMP_CID) {
smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &smp_int_data);
} else {
smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &smp_int_data);
}
}
}
/*******************************************************************************
*
* 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).
*
******************************************************************************/
static void smp_br_connect_callback(uint16_t channel, const RawAddress& bd_addr,
bool connected, uint16_t 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_WARNING("%s is called on unexpected transport %d", __func__,
transport);
return;
}
VLOG(1) << __func__ << " for pairing BDA: " << bd_addr
<< ", pairing_bda:" << p_cb->pairing_bda
<< " Event: " << ((connected) ? "connected" : "disconnected");
if (bd_addr != p_cb->pairing_bda) return;
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_t channel, const RawAddress& bd_addr,
BT_HDR* p_buf) {
tSMP_CB* p_cb = &smp_cb;
uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
uint8_t cmd;
SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
if (p_buf->len < 1) {
android_errorWriteLog(0x534e4554, "111215315");
SMP_TRACE_WARNING("%s: smp packet length %d too short: must be at least 1",
__func__, p_buf->len);
osi_free(p_buf);
return;
}
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;
p_cb->pairing_bda = bd_addr;
} else if (bd_addr != p_cb->pairing_bda) {
osi_free(p_buf);
smp_reject_unexpected_pairing_command(bd_addr);
return;
}
/* else, out of state pairing request received, passed into State Machine */
}
if (bd_addr == p_cb->pairing_bda) {
alarm_set_on_mloop(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
smp_rsp_timeout, NULL);
smp_log_metrics(p_cb->pairing_bda, false /* incoming */,
p_buf->data + p_buf->offset, p_buf->len);
p_cb->rcvd_cmd_code = cmd;
p_cb->rcvd_cmd_len = (uint8_t)p_buf->len;
tSMP_INT_DATA smp_int_data;
smp_int_data.p_data = p;
smp_br_state_machine_event(p_cb, cmd, &smp_int_data);
}
osi_free(p_buf);
}