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446 lines
15 KiB
C
446 lines
15 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2003-2012 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 module contains the link control state machine and functions which
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* operate on the link control block.
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*
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******************************************************************************/
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#include <string.h>
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#include "stack/bt_types.h"
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#include "common/bt_target.h"
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#include "common/bt_defs.h"
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#include "stack/avct_api.h"
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#include "avct_int.h"
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#include "osi/allocator.h"
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#if (defined(AVCT_INCLUDED) && AVCT_INCLUDED == TRUE)
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/*****************************************************************************
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** state machine constants and types
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*****************************************************************************/
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#if BT_TRACE_VERBOSE == TRUE
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/* verbose state strings for trace */
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const char *const avct_lcb_st_str[] = {
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"LCB_IDLE_ST",
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"LCB_OPENING_ST",
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"LCB_OPEN_ST",
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"LCB_CLOSING_ST"
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};
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/* verbose event strings for trace */
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const char *const avct_lcb_evt_str[] = {
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"UL_BIND_EVT",
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"UL_UNBIND_EVT",
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"UL_MSG_EVT",
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"INT_CLOSE_EVT",
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"LL_OPEN_EVT",
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"LL_CLOSE_EVT",
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"LL_MSG_EVT",
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"LL_CONG_EVT"
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};
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#endif
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/* lcb state machine states */
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enum {
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AVCT_LCB_IDLE_ST,
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AVCT_LCB_OPENING_ST,
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AVCT_LCB_OPEN_ST,
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AVCT_LCB_CLOSING_ST
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};
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/* state machine action enumeration list */
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enum {
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AVCT_LCB_CHNL_OPEN,
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AVCT_LCB_CHNL_DISC,
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AVCT_LCB_SEND_MSG,
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AVCT_LCB_OPEN_IND,
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AVCT_LCB_OPEN_FAIL,
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AVCT_LCB_CLOSE_IND,
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AVCT_LCB_CLOSE_CFM,
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AVCT_LCB_MSG_IND,
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AVCT_LCB_CONG_IND,
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AVCT_LCB_BIND_CONN,
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AVCT_LCB_BIND_FAIL,
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AVCT_LCB_UNBIND_DISC,
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AVCT_LCB_CHK_DISC,
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AVCT_LCB_DISCARD_MSG,
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AVCT_LCB_DEALLOC,
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AVCT_LCB_FREE_MSG_IND,
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AVCT_LCB_NUM_ACTIONS
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};
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#define AVCT_LCB_IGNORE AVCT_LCB_NUM_ACTIONS
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/* type for action functions */
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typedef void (*tAVCT_LCB_ACTION)(tAVCT_LCB *p_ccb, tAVCT_LCB_EVT *p_data);
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/* action function list */
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const tAVCT_LCB_ACTION avct_lcb_action[] = {
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avct_lcb_chnl_open,
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avct_lcb_chnl_disc,
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avct_lcb_send_msg,
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avct_lcb_open_ind,
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avct_lcb_open_fail,
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avct_lcb_close_ind,
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avct_lcb_close_cfm,
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avct_lcb_msg_ind,
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avct_lcb_cong_ind,
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avct_lcb_bind_conn,
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avct_lcb_bind_fail,
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avct_lcb_unbind_disc,
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avct_lcb_chk_disc,
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avct_lcb_discard_msg,
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avct_lcb_dealloc,
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avct_lcb_free_msg_ind
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};
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/* state table information */
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#define AVCT_LCB_ACTIONS 2 /* number of actions */
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#define AVCT_LCB_NEXT_STATE 2 /* position of next state */
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#define AVCT_LCB_NUM_COLS 3 /* number of columns in state tables */
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/* state table for idle state */
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const UINT8 avct_lcb_st_idle[][AVCT_LCB_NUM_COLS] = {
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/* Event Action 1 Action 2 Next state */
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/* UL_BIND_EVT */ {AVCT_LCB_CHNL_OPEN, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
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/* UL_UNBIND_EVT */ {AVCT_LCB_UNBIND_DISC, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
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/* UL_MSG_EVT */ {AVCT_LCB_DISCARD_MSG, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
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/* INT_CLOSE_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
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/* LL_OPEN_EVT */ {AVCT_LCB_OPEN_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* LL_CLOSE_EVT */ {AVCT_LCB_CLOSE_IND, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
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/* LL_MSG_EVT */ {AVCT_LCB_FREE_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST},
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/* LL_CONG_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_IDLE_ST}
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};
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/* state table for opening state */
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const UINT8 avct_lcb_st_opening[][AVCT_LCB_NUM_COLS] = {
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/* Event Action 1 Action 2 Next state */
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/* UL_BIND_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
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/* UL_UNBIND_EVT */ {AVCT_LCB_UNBIND_DISC, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
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/* UL_MSG_EVT */ {AVCT_LCB_DISCARD_MSG, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
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/* INT_CLOSE_EVT */ {AVCT_LCB_CHNL_DISC, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* LL_OPEN_EVT */ {AVCT_LCB_OPEN_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* LL_CLOSE_EVT */ {AVCT_LCB_OPEN_FAIL, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
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/* LL_MSG_EVT */ {AVCT_LCB_FREE_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST},
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/* LL_CONG_EVT */ {AVCT_LCB_CONG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPENING_ST}
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};
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/* state table for open state */
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const UINT8 avct_lcb_st_open[][AVCT_LCB_NUM_COLS] = {
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/* Event Action 1 Action 2 Next state */
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/* UL_BIND_EVT */ {AVCT_LCB_BIND_CONN, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* UL_UNBIND_EVT */ {AVCT_LCB_CHK_DISC, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* UL_MSG_EVT */ {AVCT_LCB_SEND_MSG, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* INT_CLOSE_EVT */ {AVCT_LCB_CHNL_DISC, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* LL_OPEN_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* LL_CLOSE_EVT */ {AVCT_LCB_CLOSE_IND, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
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/* LL_MSG_EVT */ {AVCT_LCB_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST},
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/* LL_CONG_EVT */ {AVCT_LCB_CONG_IND, AVCT_LCB_IGNORE, AVCT_LCB_OPEN_ST}
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};
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/* state table for closing state */
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const UINT8 avct_lcb_st_closing[][AVCT_LCB_NUM_COLS] = {
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/* Event Action 1 Action 2 Next state */
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/* UL_BIND_EVT */ {AVCT_LCB_BIND_FAIL, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* UL_UNBIND_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* UL_MSG_EVT */ {AVCT_LCB_DISCARD_MSG, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* INT_CLOSE_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* LL_OPEN_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* LL_CLOSE_EVT */ {AVCT_LCB_CLOSE_CFM, AVCT_LCB_DEALLOC, AVCT_LCB_IDLE_ST},
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/* LL_MSG_EVT */ {AVCT_LCB_FREE_MSG_IND, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST},
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/* LL_CONG_EVT */ {AVCT_LCB_IGNORE, AVCT_LCB_IGNORE, AVCT_LCB_CLOSING_ST}
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};
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/* type for state table */
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typedef const UINT8 (*tAVCT_LCB_ST_TBL)[AVCT_LCB_NUM_COLS];
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/* state table */
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const tAVCT_LCB_ST_TBL avct_lcb_st_tbl[] = {
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avct_lcb_st_idle,
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avct_lcb_st_opening,
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avct_lcb_st_open,
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avct_lcb_st_closing
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};
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/*******************************************************************************
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**
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** Function avct_lcb_event
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**
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** Description State machine event handling function for lcb
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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void avct_lcb_event(tAVCT_LCB *p_lcb, UINT8 event, tAVCT_LCB_EVT *p_data)
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{
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tAVCT_LCB_ST_TBL state_table;
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UINT8 action;
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int i;
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#if BT_TRACE_VERBOSE == TRUE
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AVCT_TRACE_EVENT("LCB lcb=%d event=%s state=%s", p_lcb->allocated, avct_lcb_evt_str[event], avct_lcb_st_str[p_lcb->state]);
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#else
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AVCT_TRACE_EVENT("LCB lcb=%d event=%d state=%d", p_lcb->allocated, event, p_lcb->state);
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#endif
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/* look up the state table for the current state */
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state_table = avct_lcb_st_tbl[p_lcb->state];
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/* set next state */
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p_lcb->state = state_table[event][AVCT_LCB_NEXT_STATE];
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/* execute action functions */
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for (i = 0; i < AVCT_LCB_ACTIONS; i++) {
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if ((action = state_table[event][i]) != AVCT_LCB_IGNORE) {
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(*avct_lcb_action[action])(p_lcb, p_data);
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} else {
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break;
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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 avct_bcb_event
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**
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** Description State machine event handling function for lcb
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**
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**
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** Returns Nothing.
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**
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*******************************************************************************/
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#if (AVCT_BROWSE_INCLUDED == TRUE)
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void avct_bcb_event(tAVCT_BCB *p_bcb, UINT8 event, tAVCT_LCB_EVT *p_data)
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{
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tAVCT_LCB_ST_TBL state_table;
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UINT8 action;
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int i;
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#if BT_TRACE_VERBOSE == TRUE
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AVCT_TRACE_EVENT("BCB lcb=%d event=%s state=%s", p_bcb->allocated, avct_lcb_evt_str[event], avct_lcb_st_str[p_bcb->state]);
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#else
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AVCT_TRACE_EVENT("BCB lcb=%d event=%d state=%d", p_bcb->allocated, event, p_bcb->state);
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#endif
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/* look up the state table for the current state */
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state_table = avct_lcb_st_tbl[p_bcb->state];
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/* set next state */
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p_bcb->state = state_table[event][AVCT_LCB_NEXT_STATE];
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/* execute action functions */
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for (i = 0; i < AVCT_LCB_ACTIONS; i++) {
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if ((action = state_table[event][i]) != AVCT_LCB_IGNORE) {
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(*avct_bcb_action[action])(p_bcb, p_data);
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} else {
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break;
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}
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}
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}
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#endif
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/*******************************************************************************
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**
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** Function avct_lcb_by_bd
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**
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** Description This lookup function finds the lcb for a BD address.
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**
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**
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** Returns pointer to the lcb, or NULL if none found.
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**
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*******************************************************************************/
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tAVCT_LCB *avct_lcb_by_bd(BD_ADDR bd_addr)
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{
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tAVCT_LCB *p_lcb = &avct_cb.lcb[0];
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int i;
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for (i = 0; i < AVCT_NUM_LINKS; i++, p_lcb++) {
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/* if allocated lcb has matching lcb */
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if (p_lcb->allocated && (!memcmp(p_lcb->peer_addr, bd_addr, BD_ADDR_LEN))) {
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break;
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}
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}
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if (i == AVCT_NUM_LINKS) {
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/* if no lcb found */
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p_lcb = NULL;
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AVCT_TRACE_DEBUG("No lcb for addr %02x-%02x-%02x-%02x-%02x-%02x",
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bd_addr[0], bd_addr[1], bd_addr[2], bd_addr[3], bd_addr[4], bd_addr[5]);
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}
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return p_lcb;
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}
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/*******************************************************************************
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**
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** Function avct_lcb_alloc
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**
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** Description Allocate a link control block.
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**
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**
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** Returns pointer to the lcb, or NULL if none could be allocated.
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**
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*******************************************************************************/
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tAVCT_LCB *avct_lcb_alloc(BD_ADDR bd_addr)
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{
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tAVCT_LCB *p_lcb = &avct_cb.lcb[0];
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int i;
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for (i = 0; i < AVCT_NUM_LINKS; i++, p_lcb++) {
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if (!p_lcb->allocated) {
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p_lcb->allocated = (UINT8)(i + 1);
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memcpy(p_lcb->peer_addr, bd_addr, BD_ADDR_LEN);
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AVCT_TRACE_DEBUG("avct_lcb_alloc %d", p_lcb->allocated);
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p_lcb->tx_q = fixed_queue_new(QUEUE_SIZE_MAX);
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break;
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}
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}
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if (i == AVCT_NUM_LINKS) {
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/* out of lcbs */
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p_lcb = NULL;
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AVCT_TRACE_WARNING("Out of lcbs");
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}
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return p_lcb;
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}
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/*******************************************************************************
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**
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** Function avct_lcb_dealloc
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**
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** Description Deallocate a link control block.
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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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void avct_lcb_dealloc(tAVCT_LCB *p_lcb, tAVCT_LCB_EVT *p_data)
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{
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UNUSED(p_data);
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AVCT_TRACE_DEBUG("%s allocated: %d", __func__, p_lcb->allocated);
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// Check if the LCB is still referenced
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tAVCT_CCB *p_ccb = &avct_cb.ccb[0];
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for (size_t i = 0; i < AVCT_NUM_CONN; i++, p_ccb++)
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{
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if (p_ccb->allocated && p_ccb->p_lcb == p_lcb)
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{
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AVCT_TRACE_DEBUG("%s LCB in use; lcb index: %d", __func__, i);
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return;
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}
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}
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// If not, de-allocate now...
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AVCT_TRACE_DEBUG("%s Freeing LCB", __func__);
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osi_free(p_lcb->p_rx_msg);
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fixed_queue_free(p_lcb->tx_q, NULL);
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memset(p_lcb, 0, sizeof(tAVCT_LCB));
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}
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/*******************************************************************************
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**
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** Function avct_lcb_by_lcid
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**
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** Description Find the LCB associated with the L2CAP LCID
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**
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**
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** Returns pointer to the lcb, or NULL if none found.
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**
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*******************************************************************************/
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tAVCT_LCB *avct_lcb_by_lcid(UINT16 lcid)
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{
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tAVCT_LCB *p_lcb = &avct_cb.lcb[0];
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int i;
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for (i = 0; i < AVCT_NUM_LINKS; i++, p_lcb++) {
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if (p_lcb->allocated && ((p_lcb->ch_lcid == lcid) || (p_lcb->conflict_lcid == lcid))) {
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break;
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}
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}
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if (i == AVCT_NUM_LINKS) {
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/* out of lcbs */
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p_lcb = NULL;
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AVCT_TRACE_WARNING("No lcb for lcid %x", lcid);
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}
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return p_lcb;
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}
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/*******************************************************************************
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**
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** Function avct_lcb_has_pid
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**
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** Description See if any ccbs on this lcb have a particular pid.
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**
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**
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** Returns Pointer to CCB if PID found, NULL otherwise.
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**
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*******************************************************************************/
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tAVCT_CCB *avct_lcb_has_pid(tAVCT_LCB *p_lcb, UINT16 pid)
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{
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tAVCT_CCB *p_ccb = &avct_cb.ccb[0];
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int i;
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for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++) {
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if (p_ccb->allocated && (p_ccb->p_lcb == p_lcb) && (p_ccb->cc.pid == pid)) {
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return p_ccb;
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}
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}
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return NULL;
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}
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/*******************************************************************************
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**
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** Function avct_lcb_last_ccb
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**
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** Description See if given ccb is only one on the lcb.
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**
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**
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** Returns TRUE if ccb is last, FALSE otherwise.
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**
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*******************************************************************************/
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BOOLEAN avct_lcb_last_ccb(tAVCT_LCB *p_lcb, tAVCT_CCB *p_ccb_last)
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{
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tAVCT_CCB *p_ccb = &avct_cb.ccb[0];
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int i;
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AVCT_TRACE_DEBUG("avct_lcb_last_ccb");
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for (i = 0; i < AVCT_NUM_CONN; i++, p_ccb++) {
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AVCT_TRACE_DEBUG("%x: aloc:%d, lcb:%p/%p, ccb:%p/%p",
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i, p_ccb->allocated, p_ccb->p_lcb, p_lcb, p_ccb, p_ccb_last);
|
|
if (p_ccb->allocated && (p_ccb->p_lcb == p_lcb) && (p_ccb != p_ccb_last)) {
|
|
return FALSE;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
|
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#endif /* #if (defined(AVCT_INCLUDED) && AVCT_INCLUDED == TRUE) */
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