/******************************************************************************
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*
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* Copyright 1999-2012 Broadcom Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/******************************************************************************
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*
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* This file contains functions for the SMP L2Cap interface
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*
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******************************************************************************/
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#include <cutils/log.h>
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#include "bt_target.h"
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#include <string.h>
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#include "btm_ble_api.h"
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#include "common/metrics.h"
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#include "l2c_api.h"
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#include "smp_int.h"
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static void smp_tx_complete_callback(uint16_t cid, uint16_t num_pkt);
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static void smp_connect_callback(uint16_t channel, const RawAddress& bd_addr,
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bool connected, uint16_t reason,
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tBT_TRANSPORT transport);
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static void smp_data_received(uint16_t channel, const RawAddress& bd_addr,
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BT_HDR* p_buf);
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static void smp_br_connect_callback(uint16_t channel, const RawAddress& bd_addr,
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bool connected, uint16_t reason,
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tBT_TRANSPORT transport);
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static void smp_br_data_received(uint16_t channel, const RawAddress& bd_addr,
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BT_HDR* p_buf);
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/*******************************************************************************
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*
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* Function smp_l2cap_if_init
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*
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* Description This function is called during the SMP task startup
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* to register interface functions with L2CAP.
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*
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******************************************************************************/
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void smp_l2cap_if_init(void) {
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tL2CAP_FIXED_CHNL_REG fixed_reg;
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SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
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fixed_reg.fixed_chnl_opts.mode = L2CAP_FCR_BASIC_MODE;
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fixed_reg.fixed_chnl_opts.max_transmit = 0;
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fixed_reg.fixed_chnl_opts.rtrans_tout = 0;
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fixed_reg.fixed_chnl_opts.mon_tout = 0;
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fixed_reg.fixed_chnl_opts.mps = 0;
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fixed_reg.fixed_chnl_opts.tx_win_sz = 0;
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fixed_reg.pL2CA_FixedConn_Cb = smp_connect_callback;
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fixed_reg.pL2CA_FixedData_Cb = smp_data_received;
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fixed_reg.pL2CA_FixedTxComplete_Cb = smp_tx_complete_callback;
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fixed_reg.pL2CA_FixedCong_Cb =
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NULL; /* do not handle congestion on this channel */
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fixed_reg.default_idle_tout =
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60; /* set 60 seconds timeout, 0xffff default idle timeout */
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L2CA_RegisterFixedChannel(L2CAP_SMP_CID, &fixed_reg);
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fixed_reg.pL2CA_FixedConn_Cb = smp_br_connect_callback;
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fixed_reg.pL2CA_FixedData_Cb = smp_br_data_received;
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L2CA_RegisterFixedChannel(L2CAP_SMP_BR_CID, &fixed_reg);
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}
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/*******************************************************************************
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*
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* Function smp_connect_callback
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*
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* Description This callback function is called by L2CAP to indicate that
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* SMP channel is
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* connected (conn = true)/disconnected (conn = false).
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*
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******************************************************************************/
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static void smp_connect_callback(uint16_t channel, const RawAddress& bd_addr,
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bool connected, uint16_t reason,
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tBT_TRANSPORT transport) {
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tSMP_CB* p_cb = &smp_cb;
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tSMP_INT_DATA int_data;
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SMP_TRACE_EVENT("%s: SMDBG l2c: bd_addr=%s, p_cb->pairing_bda=%s", __func__,
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bd_addr.ToString().c_str(),
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p_cb->pairing_bda.ToString().c_str());
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if (transport == BT_TRANSPORT_BR_EDR || bd_addr.IsEmpty()) return;
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if (bd_addr == p_cb->pairing_bda) {
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VLOG(2) << __func__ << " for pairing BDA: " << bd_addr
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<< " Event: " << ((connected) ? "connected" : "disconnected");
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if (connected) {
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if (!p_cb->connect_initialized) {
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p_cb->connect_initialized = true;
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/* initiating connection established */
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p_cb->role = L2CA_GetBleConnRole(bd_addr);
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/* initialize local i/r key to be default keys */
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p_cb->local_r_key = p_cb->local_i_key = SMP_SEC_DEFAULT_KEY;
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p_cb->loc_auth_req = p_cb->peer_auth_req = SMP_DEFAULT_AUTH_REQ;
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p_cb->cb_evt = SMP_IO_CAP_REQ_EVT;
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smp_sm_event(p_cb, SMP_L2CAP_CONN_EVT, NULL);
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}
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} else {
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int_data.reason = reason;
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/* Disconnected while doing security */
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smp_sm_event(p_cb, SMP_L2CAP_DISCONN_EVT, &int_data);
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}
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}
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}
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/*******************************************************************************
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*
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* Function smp_data_received
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*
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* Description This function is called when data is received from L2CAP on
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* SMP channel.
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*
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*
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* Returns void
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*
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******************************************************************************/
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static void smp_data_received(uint16_t channel, const RawAddress& bd_addr,
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BT_HDR* p_buf) {
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tSMP_CB* p_cb = &smp_cb;
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uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
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uint8_t cmd;
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if (p_buf->len < 1) {
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android_errorWriteLog(0x534e4554, "111215315");
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SMP_TRACE_WARNING("%s: smp packet length %d too short: must be at least 1",
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__func__, p_buf->len);
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osi_free(p_buf);
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return;
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}
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STREAM_TO_UINT8(cmd, p);
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SMP_TRACE_EVENT("%s: SMDBG l2c, cmd=0x%x", __func__, cmd);
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/* sanity check */
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if ((SMP_OPCODE_MAX < cmd) || (SMP_OPCODE_MIN > cmd)) {
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SMP_TRACE_WARNING("Ignore received command with RESERVED code 0x%02x", cmd);
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osi_free(p_buf);
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return;
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}
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/* reject the pairing request if there is an on-going SMP pairing */
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if (SMP_OPCODE_PAIRING_REQ == cmd || SMP_OPCODE_SEC_REQ == cmd) {
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if ((p_cb->state == SMP_STATE_IDLE) &&
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(p_cb->br_state == SMP_BR_STATE_IDLE) &&
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!(p_cb->flags & SMP_PAIR_FLAGS_WE_STARTED_DD)) {
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p_cb->role = L2CA_GetBleConnRole(bd_addr);
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p_cb->pairing_bda = bd_addr;
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} else if (bd_addr != p_cb->pairing_bda) {
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osi_free(p_buf);
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smp_reject_unexpected_pairing_command(bd_addr);
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return;
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}
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/* else, out of state pairing request/security request received, passed into
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* SM */
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}
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if (bd_addr == p_cb->pairing_bda) {
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alarm_set_on_mloop(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
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smp_rsp_timeout, NULL);
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smp_log_metrics(p_cb->pairing_bda, false /* incoming */,
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p_buf->data + p_buf->offset, p_buf->len);
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if (cmd == SMP_OPCODE_CONFIRM) {
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SMP_TRACE_DEBUG(
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"in %s cmd = 0x%02x, peer_auth_req = 0x%02x,"
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"loc_auth_req = 0x%02x",
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__func__, cmd, p_cb->peer_auth_req, p_cb->loc_auth_req);
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if ((p_cb->peer_auth_req & SMP_SC_SUPPORT_BIT) &&
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(p_cb->loc_auth_req & SMP_SC_SUPPORT_BIT)) {
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cmd = SMP_OPCODE_PAIR_COMMITM;
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}
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}
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p_cb->rcvd_cmd_code = cmd;
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p_cb->rcvd_cmd_len = (uint8_t)p_buf->len;
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tSMP_INT_DATA smp_int_data;
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smp_int_data.p_data = p;
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smp_sm_event(p_cb, cmd, &smp_int_data);
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}
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osi_free(p_buf);
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}
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/*******************************************************************************
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*
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* Function smp_tx_complete_callback
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*
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* Description SMP channel tx complete callback
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*
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******************************************************************************/
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static void smp_tx_complete_callback(uint16_t cid, uint16_t num_pkt) {
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tSMP_CB* p_cb = &smp_cb;
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if (p_cb->total_tx_unacked >= num_pkt)
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p_cb->total_tx_unacked -= num_pkt;
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else
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SMP_TRACE_ERROR("Unexpected %s: num_pkt = %d", __func__, num_pkt);
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if (p_cb->total_tx_unacked == 0 && p_cb->wait_for_authorization_complete) {
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tSMP_INT_DATA smp_int_data;
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smp_int_data.status = SMP_SUCCESS;
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if (cid == L2CAP_SMP_CID) {
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smp_sm_event(p_cb, SMP_AUTH_CMPL_EVT, &smp_int_data);
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} else {
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smp_br_state_machine_event(p_cb, SMP_BR_AUTH_CMPL_EVT, &smp_int_data);
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}
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}
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}
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/*******************************************************************************
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*
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* Function smp_br_connect_callback
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*
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* Description This callback function is called by L2CAP to indicate that
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* SMP BR channel is
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* connected (conn = true)/disconnected (conn = false).
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*
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******************************************************************************/
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static void smp_br_connect_callback(uint16_t channel, const RawAddress& bd_addr,
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bool connected, uint16_t reason,
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tBT_TRANSPORT transport) {
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tSMP_CB* p_cb = &smp_cb;
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tSMP_INT_DATA int_data;
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SMP_TRACE_EVENT("%s", __func__);
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if (transport != BT_TRANSPORT_BR_EDR) {
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SMP_TRACE_WARNING("%s is called on unexpected transport %d", __func__,
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transport);
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return;
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}
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VLOG(1) << __func__ << " for pairing BDA: " << bd_addr
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<< ", pairing_bda:" << p_cb->pairing_bda
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<< " Event: " << ((connected) ? "connected" : "disconnected");
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if (bd_addr != p_cb->pairing_bda) return;
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if (connected) {
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if (!p_cb->connect_initialized) {
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p_cb->connect_initialized = true;
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/* initialize local i/r key to be default keys */
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p_cb->local_r_key = p_cb->local_i_key = SMP_BR_SEC_DEFAULT_KEY;
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p_cb->loc_auth_req = p_cb->peer_auth_req = 0;
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p_cb->cb_evt = SMP_BR_KEYS_REQ_EVT;
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smp_br_state_machine_event(p_cb, SMP_BR_L2CAP_CONN_EVT, NULL);
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}
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} else {
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int_data.reason = reason;
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/* Disconnected while doing security */
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smp_br_state_machine_event(p_cb, SMP_BR_L2CAP_DISCONN_EVT, &int_data);
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}
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}
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/*******************************************************************************
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*
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* Function smp_br_data_received
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*
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* Description This function is called when data is received from L2CAP on
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* SMP BR channel.
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*
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* Returns void
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*
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******************************************************************************/
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static void smp_br_data_received(uint16_t channel, const RawAddress& bd_addr,
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BT_HDR* p_buf) {
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tSMP_CB* p_cb = &smp_cb;
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uint8_t* p = (uint8_t*)(p_buf + 1) + p_buf->offset;
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uint8_t cmd;
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SMP_TRACE_EVENT("SMDBG l2c %s", __func__);
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if (p_buf->len < 1) {
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android_errorWriteLog(0x534e4554, "111215315");
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SMP_TRACE_WARNING("%s: smp packet length %d too short: must be at least 1",
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__func__, p_buf->len);
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osi_free(p_buf);
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return;
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}
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STREAM_TO_UINT8(cmd, p);
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/* sanity check */
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if ((SMP_OPCODE_MAX < cmd) || (SMP_OPCODE_MIN > cmd)) {
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SMP_TRACE_WARNING("Ignore received command with RESERVED code 0x%02x", cmd);
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osi_free(p_buf);
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return;
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}
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/* reject the pairing request if there is an on-going SMP pairing */
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if (SMP_OPCODE_PAIRING_REQ == cmd) {
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if ((p_cb->state == SMP_STATE_IDLE) &&
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(p_cb->br_state == SMP_BR_STATE_IDLE)) {
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p_cb->role = HCI_ROLE_SLAVE;
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p_cb->smp_over_br = true;
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p_cb->pairing_bda = bd_addr;
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} else if (bd_addr != p_cb->pairing_bda) {
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osi_free(p_buf);
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smp_reject_unexpected_pairing_command(bd_addr);
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return;
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}
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/* else, out of state pairing request received, passed into State Machine */
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}
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if (bd_addr == p_cb->pairing_bda) {
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alarm_set_on_mloop(p_cb->smp_rsp_timer_ent, SMP_WAIT_FOR_RSP_TIMEOUT_MS,
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smp_rsp_timeout, NULL);
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smp_log_metrics(p_cb->pairing_bda, false /* incoming */,
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p_buf->data + p_buf->offset, p_buf->len);
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p_cb->rcvd_cmd_code = cmd;
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p_cb->rcvd_cmd_len = (uint8_t)p_buf->len;
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tSMP_INT_DATA smp_int_data;
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smp_int_data.p_data = p;
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smp_br_state_machine_event(p_cb, cmd, &smp_int_data);
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}
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osi_free(p_buf);
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}
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