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