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freebsd-skq/usr.sbin/i4b/isdnd/fsm.c

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/*
* Copyright (c) 1997, 2002 Hellmuth Michaelis. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------
*
* FSM for isdnd
* -------------
*
* $FreeBSD$
*
* last edit-date: [Sat May 13 13:06:40 2006]
*
*---------------------------------------------------------------------------*/
#include "isdnd.h"
/* table of state descriptions */
static char *state_text[N_STATES] = {
"idle",
"dialing",
"waitdialretry",
"dialretry",
"pcb-dialing",
"pcb-dialfail",
"pcb-waitcall",
"acb-waitdisc",
"acb-waitdial",
"acb-dialing",
"acb-dialfail",
"accepted",
"connected",
"waitdisconnect",
"down",
"alert",
"Illegal State"
};
/* table of event descriptions */
static char *event_text[N_EVENTS] = {
/* incoming messages */
"msg-con-ind",
"msg-con-act-ind",
"msg-disc-ind",
"msg-dialout",
/* local events */
"timeout",
"disconnect-req",
"callback-req",
"alert-req",
/* illegal */
"Illegal Event"
};
/*---------------------------------------------------------------------------*
* illegal state default action
*---------------------------------------------------------------------------*/
static void
F_ill(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_ill: Illegal State reached !!!")));
}
/*---------------------------------------------------------------------------*
* No change, No action
*---------------------------------------------------------------------------*/
static void
F_NcNa(cfg_entry_t *cep)
{
}
/*---------------------------------------------------------------------------*
* incoming CONNECT, accepting call
*---------------------------------------------------------------------------*/
static void
F_MCI(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_MCI: tx SETUP_RESP_ACCEPT")));
sendm_connect_resp(cep, cep->cdid, SETUP_RESP_ACCEPT, 0);
start_timer(cep, TIMEOUT_CONNECT_ACTIVE);
}
/*---------------------------------------------------------------------------*
* incoming connect active, call is now active
*---------------------------------------------------------------------------*/
static void
F_MCAI(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_MCAI: Connection active!")));
stop_timer(cep);
if((cep->dialin_reaction == REACT_ANSWER) &&
(cep->b1protocol == BPROT_NONE))
{
exec_answer(cep);
}
}
/*---------------------------------------------------------------------------*
* timeout
*---------------------------------------------------------------------------*/
static void
F_TIMO(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_TIMO: Timout occured!")));
sendm_disconnect_req(cep, (CAUSET_I4B << 8) | CAUSE_I4B_NORMAL);
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* incoming disconnect indication
*---------------------------------------------------------------------------*/
static void
F_IDIS(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_IDIS: disconnect indication")));
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* local disconnect request
*---------------------------------------------------------------------------*/
static void
F_DRQ(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_DRQ: local disconnect request")));
sendm_disconnect_req(cep, (CAUSET_I4B << 8) | CAUSE_I4B_NORMAL);
}
/*---------------------------------------------------------------------------*
* disconnect indication after local disconnect req
*---------------------------------------------------------------------------*/
static void
F_MDI(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_MDI: disconnect indication, local disconnected")));
cep->cdid = CDID_UNUSED;
}
/*---------------------------------------------------------------------------*
* local requested outgoing dial
*---------------------------------------------------------------------------*/
static void
F_DIAL(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_DIAL: local dial out request")));
if(cep->dialrandincr)
cep->randomtime = (random() & RANDOM_MASK) + cep->recoverytime;
cep->dial_count = 0;
select_first_dialno(cep);
sendm_connect_req(cep);
}
/*---------------------------------------------------------------------------*
* outgoing dial successfull
*---------------------------------------------------------------------------*/
static void
F_DOK(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_DOK: dial out ok")));
select_this_dialno(cep);
}
/*---------------------------------------------------------------------------*
* outgoing dial fail (ST_SUSE !!!)
*---------------------------------------------------------------------------*/
static void
F_DFL(cfg_entry_t *cep)
{
cep->last_release_time = time(NULL);
if(cep->dialouttype == DIALOUT_NORMAL)
{
cep->dial_count++;
if(cep->dial_count < cep->dialretries || cep->dialretries == -1)
{
/* inside normal retry cycle */
DBGL(DL_STATE, (llog(LL_DBG, "F_DFL: dial fail, dial retry")));
select_next_dialno(cep);
cep->cdid = CDID_RESERVED;
cep->state = ST_DIALRTMRCHD;
return;
}
/* retries exhausted */
if(!cep->usedown)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_DFL: dial retry fail, dial retries exhausted")));
dialresponse(cep, DSTAT_TFAIL);
cep->cdid = CDID_UNUSED;
cep->dial_count = 0;
cep->state = ST_IDLE;
return;
}
/* interface up/down active */
cep->down_retry_count++;
if(cep->down_retry_count > cep->downtries)
{
/* set interface down */
DBGL(DL_STATE, (llog(LL_DBG, "F_DFL: dial retry cycle fail, setting interface down!")));
dialresponse(cep, DSTAT_PFAIL);
if_down(cep);
cep->state = ST_DOWN;
}
else
{
/* enter new dial retry cycle */
DBGL(DL_STATE, (llog(LL_DBG, "F_DFL: dial retry cycle fail, enter new retry cycle!")));
select_next_dialno(cep);
cep->state = ST_DIALRTMRCHD;
}
cep->dial_count = 0;
cep->cdid = CDID_RESERVED;
}
else /* cdp->dialouttype == DIALOUT_CALLEDBACK */
{
DBGL(DL_STATE, (llog(LL_DBG, "F_DFL: calledback dial done, wait for incoming call")));
cep->cdid = CDID_RESERVED;
cep->state = ST_PCB_WAITCALL;
}
}
/*---------------------------------------------------------------------------*
* local requested outgoing dial
*---------------------------------------------------------------------------*/
static void
F_ACBW(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_ACBW: local callback, wait callback recovery time")));
if(cep->dialrandincr)
cep->randomtime = (random() & RANDOM_MASK) + cep->recoverytime;
cep->dial_count = 0;
cep->cdid = CDID_RESERVED;
}
/*---------------------------------------------------------------------------*
* active callback dialout retry (ST_SUSE !!!)
*---------------------------------------------------------------------------*/
static void
F_ACBR(cfg_entry_t *cep)
{
cep->dial_count++;
if(cep->dial_count < cep->dialretries || cep->dialretries == -1)
{
/* inside normal retry cycle */
DBGL(DL_STATE, (llog(LL_DBG, "F_ACBR: dial fail, dial retry")));
select_next_dialno(cep);
cep->cdid = CDID_RESERVED;
cep->state = ST_ACB_DIALFAIL;
return;
}
/* retries exhausted */
if(!cep->usedown)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_ACBR: dial retry fail, dial retries exhausted")));
dialresponse(cep, DSTAT_TFAIL);
cep->cdid = CDID_UNUSED;
cep->dial_count = 0;
cep->state = ST_IDLE;
return;
}
/* interface up/down active */
cep->down_retry_count++;
if(cep->down_retry_count > cep->downtries)
{
/* set interface down */
DBGL(DL_STATE, (llog(LL_DBG, "F_ACBR: dial retry cycle fail, setting interface down!")));
dialresponse(cep, DSTAT_PFAIL);
if_down(cep);
cep->state = ST_DOWN;
}
else
{
/* enter new dial retry cycle */
DBGL(DL_STATE, (llog(LL_DBG, "F_ACBR: dial retry cycle fail, enter new retry cycle!")));
select_next_dialno(cep);
cep->state = ST_ACB_DIALFAIL;
}
cep->dial_count = 0;
cep->cdid = CDID_RESERVED;
}
/*---------------------------------------------------------------------------*
* local requested to send ALERT message
*---------------------------------------------------------------------------*/
static void
F_ALRT(cfg_entry_t *cep)
{
DBGL(DL_STATE, (llog(LL_DBG, "F_ALRT: local send alert request")));
cep->alert_time = cep->alert;
sendm_alert_req(cep);
}
/*---------------------------------------------------------------------------*
* isdn daemon state transition table
*---------------------------------------------------------------------------*/
struct state_tab {
void(*func)(cfg_entry_t *cep); /* function to execute */
int newstate; /* next state */
} state_tab[N_EVENTS][N_STATES] = {
/* STATE: ST_IDLE ST_DIAL ST_DIALRTMRCHD ST_DIALRETRY ST_PCB_DIAL ST_PCB_DIALFAIL ST_PCB_WAITCALL ST_ACB_WAITDISC ST_ACB_WAITDIAL ST_ACB_DIAL ST_ACB_DIALFAIL ST_ACCEPTED ST_CONNECTED ST_WAITDISCI ST_DOWN ST_ALERT ST_ILLEGAL */
/* -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------*/
/* messages */
/* EV_MCI */{{F_MCI, ST_ACCEPTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_MCI, ST_ACCEPTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_MCI, ST_ACCEPTED}, {F_ill, ST_ILL}},
/* EV_MCAI */{{F_ill, ST_ILL}, {F_DOK, ST_CONNECTED}, {F_ill, ST_ILL}, {F_DOK, ST_CONNECTED}, {F_DOK, ST_CONNECTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_DOK, ST_CONNECTED}, {F_ill, ST_ILL}, {F_MCAI,ST_CONNECTED}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_MDI */{{F_ill, ST_ILL}, {F_DFL, ST_SUSE}, {F_ill, ST_ILL}, {F_DFL, ST_SUSE}, {F_DFL, ST_SUSE}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ACBW,ST_ACB_WAITDIAL},{F_ill, ST_ILL}, {F_ACBR, ST_SUSE}, {F_ACBR,ST_SUSE}, {F_IDIS,ST_IDLE}, {F_IDIS,ST_IDLE}, {F_MDI, ST_IDLE}, {F_ill, ST_ILL}, {F_MDI, ST_IDLE}, {F_ill, ST_ILL}},
/* EV_MDO */{{F_DIAL,ST_DIAL}, {F_NcNa,ST_DIAL}, {F_NcNa,ST_DIALRTMRCHD},{F_NcNa,ST_DIALRETRY}, {F_NcNa,ST_PCB_DIAL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* local requests */
/* EV_TIMO */{{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_TIMO,ST_IDLE}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_DRQ */{{F_NcNa, ST_IDLE}, {F_DRQ, ST_WAITDISCI}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_DRQ, ST_WAITDISCI}, {F_NcNa,ST_WAITDISCI}, {F_NcNa, ST_DOWN}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_CBRQ */{{F_NcNa,ST_ACB_WAITDIAL},{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_NcNa,ST_ACB_WAITDIAL},{F_NcNa, ST_ACB_DIAL}, {F_NcNa,ST_ACB_DIALFAIL},{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* EV_ALRT */{{F_ALRT,ST_ALERT}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}},
/* illegal */
/* EV_ILL */{{F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}, {F_ill, ST_ILL}}
};
/*---------------------------------------------------------------------------*
* event handler
*---------------------------------------------------------------------------*/
void
next_state(cfg_entry_t *cep, int event)
{
int currstate, newstate;
if(event > N_EVENTS)
{
llog(LL_ERR, "next_state: event > N_EVENTS");
error_exit(1, "next_state: event > N_EVENTS");
}
currstate = cep->state;
if(currstate > N_STATES)
{
llog(LL_ERR, "next_state: currstate > N_STATES");
error_exit(1, "next_state: currstate > N_STATES");
}
newstate = state_tab[event][currstate].newstate;
if(newstate > N_STATES)
{
llog(LL_ERR, "next_state: newstate > N_STATES");
error_exit(1, "next_state: newstate > N_STATES");
}
if(newstate != ST_SUSE)
{
DBGL(DL_STATE, (llog(LL_DBG, "FSM event [%s]: [%s => %s]", event_text[event],
state_text[currstate],
state_text[newstate])));
}
(*state_tab[event][currstate].func)(cep);
if(newstate == ST_ILL)
{
llog(LL_ERR, "FSM ILLEGAL STATE, event=%s: oldstate=%s => newstate=%s]",
event_text[event],
state_text[currstate],
state_text[newstate]);
}
if(newstate == ST_SUSE)
{
DBGL(DL_STATE, (llog(LL_DBG, "FSM (SUSE) event [%s]: [%s => %s]", event_text[event],
state_text[currstate],
state_text[cep->state])));
}
else
{
cep->state = newstate;
}
}
/*---------------------------------------------------------------------------*
* return pointer to current state description
*---------------------------------------------------------------------------*/
char *
printstate(cfg_entry_t *cep)
{
return((char *) state_text[cep->state]);
}
/* EOF */
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