/*
* fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
*/
static void fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len) {
int ret;
int treat_as_reject;
if (id != f->reqid || f->seen_ack) /* Expected id? */
return; /* Nope, toss... */
if (code == CONFNAK) {
++f->rnakloops;
treat_as_reject = (f->rnakloops >= f->maxnakloops);
if (f->callbacks->nakci == NULL
|| !(ret = f->callbacks->nakci(f, inp, len, treat_as_reject))) {
ppp_error("Received bad configure-nak: %P", inp, len);
return;
}
} else {
f->rnakloops = 0;
if (f->callbacks->rejci == NULL
|| !(ret = f->callbacks->rejci(f, inp, len))) {
ppp_error("Received bad configure-rej: %P", inp, len);
return;
}
}
f->seen_ack = 1;
switch (f->state) {
case PPP_FSM_CLOSED:
case PPP_FSM_STOPPED:
fsm_sdata(f, TERMACK, id, NULL, 0);
break;
case PPP_FSM_REQSENT:
case PPP_FSM_ACKSENT:
/* They didn't agree to what we wanted - try another request */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
if (ret < 0)
f->state = PPP_FSM_STOPPED; /* kludge for stopping CCP */
else
fsm_sconfreq(f, 0); /* Send Configure-Request */
break;
case PPP_FSM_ACKRCVD:
/* Got a Nak/reject when we had already had an Ack?? oh well... */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = PPP_FSM_REQSENT;
break;
case PPP_FSM_OPENED:
/* Go down and restart negotiation */
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = PPP_FSM_REQSENT;
break;
default:
break;
}
}
/*
* fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
*/
static void
fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len)
{
int (*proc) (fsm *, u_char *, int);
int ret;
FSMDEBUG(LOG_INFO, ("fsm_rconfnakrej(%s): Rcvd id %d state=%d (%s)\n",
PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
if (id != f->reqid || f->seen_ack) { /* Expected id? */
return; /* Nope, toss... */
}
proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci;
if (!proc || !((ret = proc(f, inp, len)))) {
/* Nak/reject is bad - ignore it */
FSMDEBUG(LOG_INFO, ("%s: received bad %s (length %d)\n",
PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len));
return;
}
f->seen_ack = 1;
switch (f->state) {
case LS_CLOSED:
case LS_STOPPED:
fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
break;
case LS_REQSENT:
case LS_ACKSENT:
/* They didn't agree to what we wanted - try another request */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
if (ret < 0) {
f->state = LS_STOPPED; /* kludge for stopping CCP */
} else {
fsm_sconfreq(f, 0); /* Send Configure-Request */
}
break;
case LS_ACKRCVD:
/* Got a Nak/reject when we had already had an Ack?? oh well... */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = LS_REQSENT;
break;
case LS_OPENED:
/* Go down and restart negotiation */
if (f->callbacks->down) {
(*f->callbacks->down)(f); /* Inform upper layers */
}
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = LS_REQSENT;
break;
}
}
/*
* fsm_rconfack - Receive Configure-Ack.
*/
static void
fsm_rconfack(fsm *f, int id, u_char *inp, int len)
{
FSMDEBUG(LOG_INFO, ("fsm_rconfack(%s): Rcvd id %d state=%d (%s)\n",
PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
if (id != f->reqid || f->seen_ack) { /* Expected id? */
return; /* Nope, toss... */
}
if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len): (len == 0)) ) {
/* Ack is bad - ignore it */
FSMDEBUG(LOG_INFO, ("%s: received bad Ack (length %d)\n",
PROTO_NAME(f), len));
return;
}
f->seen_ack = 1;
switch (f->state) {
case LS_CLOSED:
case LS_STOPPED:
fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
break;
case LS_REQSENT:
f->state = LS_ACKRCVD;
f->retransmits = f->maxconfreqtransmits;
break;
case LS_ACKRCVD:
/* Huh? an extra valid Ack? oh well... */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = LS_REQSENT;
break;
case LS_ACKSENT:
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = LS_OPENED;
f->retransmits = f->maxconfreqtransmits;
if (f->callbacks->up) {
(*f->callbacks->up)(f); /* Inform upper layers */
}
break;
case LS_OPENED:
/* Go down and restart negotiation */
if (f->callbacks->down) {
(*f->callbacks->down)(f); /* Inform upper layers */
}
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = LS_REQSENT;
break;
}
}
/*
* fsm_rconfack - Receive Configure-Ack.
*/
static void
fsm_rconfack(fsm *f, int id, u_char *inp, int len)
{
FSMDEBUG((LOG_INFO, "fsm_rconfack(%s): Rcvd id %d.",
PROTO_NAME(f), id));
if (id != f->reqid || f->seen_ack) /* Expected id? */
return; /* Nope, toss... */
if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len):
(len == 0)) ){
/* Ack is bad - ignore it */
log_packet(inp, len, "Received bad configure-ack: ", LOG_ERR);
FSMDEBUG((LOG_INFO, "%s: received bad Ack (length %d)",
PROTO_NAME(f), len));
return;
}
f->seen_ack = 1;
switch (f->state) {
case CLOSED:
case STOPPED:
fsm_sdata(f, TERMACK, id, NULL, 0);
break;
case REQSENT:
f->state = ACKRCVD;
f->retransmits = f->maxconfreqtransmits;
break;
case ACKRCVD:
/* Huh? an extra valid Ack? oh well... */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = REQSENT;
break;
case ACKSENT:
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = OPENED;
f->retransmits = f->maxconfreqtransmits;
if (f->callbacks->up)
(*f->callbacks->up)(f); /* Inform upper layers */
break;
case OPENED:
/* Go down and restart negotiation */
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = REQSENT;
break;
}
}
/*
* fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
*/
static void
fsm_rconfnakrej(
fsm *f,
int code, int id,
u_char *inp,
int len)
{
int (*proc)(fsm *, u_char *, int);
int ret;
if (id != f->reqid || f->seen_ack) /* Expected id? */
return; /* Nope, toss... */
proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci;
if (!proc || !(ret = proc(f, inp, len))) {
/* Nak/reject is bad - ignore it */
error("Received bad configure-nak/rej: %P", inp, len);
return;
}
f->seen_ack = 1;
switch (f->state) {
case CLOSED:
case STOPPED:
fsm_sdata(f, TERMACK, id, NULL, 0);
break;
case REQSENT:
case ACKSENT:
/* They didn't agree to what we wanted - try another request */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
if (ret < 0)
f->state = STOPPED; /* kludge for stopping CCP */
else
fsm_sconfreq(f, 0); /* Send Configure-Request */
break;
case ACKRCVD:
/* Got a Nak/reject when we had already had an Ack?? oh well... */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = REQSENT;
break;
case OPENED:
/* Go down and restart negotiation */
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = REQSENT;
break;
}
}
/*
* fsm_rconfack - Receive Configure-Ack.
*/
static void fsm_rconfack(fsm *f, int id, u_char *inp, int len) {
ppp_pcb *pcb = f->pcb;
if (id != f->reqid || f->seen_ack) /* Expected id? */
return; /* Nope, toss... */
if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len):
(len == 0)) ){
/* Ack is bad - ignore it */
ppp_error("Received bad configure-ack: %P", inp, len);
return;
}
f->seen_ack = 1;
f->rnakloops = 0;
switch (f->state) {
case PPP_FSM_CLOSED:
case PPP_FSM_STOPPED:
fsm_sdata(f, TERMACK, id, NULL, 0);
break;
case PPP_FSM_REQSENT:
f->state = PPP_FSM_ACKRCVD;
f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
break;
case PPP_FSM_ACKRCVD:
/* Huh? an extra valid Ack? oh well... */
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = PPP_FSM_REQSENT;
break;
case PPP_FSM_ACKSENT:
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = PPP_FSM_OPENED;
f->retransmits = pcb->settings.fsm_max_conf_req_transmits;
if (f->callbacks->up)
(*f->callbacks->up)(f); /* Inform upper layers */
break;
case PPP_FSM_OPENED:
/* Go down and restart negotiation */
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = PPP_FSM_REQSENT;
break;
default:
break;
}
}
/*
* fsm_lowerup - The lower layer is up.
*/
void
fsm_lowerup(fsm *f)
{
int oldState = f->state;
LWIP_UNUSED_ARG(oldState);
switch( f->state ) {
case LS_INITIAL:
f->state = LS_CLOSED;
break;
case LS_STARTING:
if( f->flags & OPT_SILENT ) {
f->state = LS_STOPPED;
} else {
/* Send an initial configure-request */
fsm_sconfreq(f, 0);
f->state = LS_REQSENT;
}
break;
default:
FSMDEBUG(LOG_INFO, ("%s: Up event in state %d (%s)!\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
}
FSMDEBUG(LOG_INFO, ("%s: lowerup state %d (%s) -> %d (%s)\n",
PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
}
/*
* fsm_rtermack - Receive Terminate-Ack.
*/
static void fsm_rtermack(fsm *f) {
switch (f->state) {
case PPP_FSM_CLOSING:
UNTIMEOUT(fsm_timeout, f);
f->state = PPP_FSM_CLOSED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
break;
case PPP_FSM_STOPPING:
UNTIMEOUT(fsm_timeout, f);
f->state = PPP_FSM_STOPPED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
break;
case PPP_FSM_ACKRCVD:
f->state = PPP_FSM_REQSENT;
break;
case PPP_FSM_OPENED:
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0);
f->state = PPP_FSM_REQSENT;
break;
default:
break;
}
}
/*
* fsm_open - Link is allowed to come up.
*/
void fsm_open(fsm *f) {
switch( f->state ){
case PPP_FSM_INITIAL:
f->state = PPP_FSM_STARTING;
if( f->callbacks->starting )
(*f->callbacks->starting)(f);
break;
case PPP_FSM_CLOSED:
if( f->flags & OPT_SILENT )
f->state = PPP_FSM_STOPPED;
else {
/* Send an initial configure-request */
fsm_sconfreq(f, 0);
f->state = PPP_FSM_REQSENT;
}
break;
case PPP_FSM_CLOSING:
f->state = PPP_FSM_STOPPING;
/* fall through */
/* no break */
case PPP_FSM_STOPPED:
case PPP_FSM_OPENED:
if( f->flags & OPT_RESTART ){
fsm_lowerdown(f);
fsm_lowerup(f);
}
break;
default:
break;
}
}
/*
* fsm_rtermack - Receive Terminate-Ack.
*/
static void
fsm_rtermack(fsm *f)
{
FSMDEBUG((LOG_INFO, "fsm_rtermack(%s): state=%d (%s)\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
switch (f->state) {
case LS_CLOSING:
UNTIMEOUT(fsm_timeout, f);
f->state = LS_CLOSED;
if( f->callbacks->finished ) {
(*f->callbacks->finished)(f);
}
break;
case LS_STOPPING:
UNTIMEOUT(fsm_timeout, f);
f->state = LS_STOPPED;
if( f->callbacks->finished ) {
(*f->callbacks->finished)(f);
}
break;
case LS_ACKRCVD:
f->state = LS_REQSENT;
break;
case LS_OPENED:
if (f->callbacks->down) {
(*f->callbacks->down)(f); /* Inform upper layers */
}
fsm_sconfreq(f, 0);
break;
}
}
/*
* fsm_rtermack - Receive Terminate-Ack.
*/
static void
fsm_rtermack(fsm *f)
{
FSMDEBUG((LOG_INFO, "fsm_rtermack(%s).", PROTO_NAME(f)));
switch (f->state) {
case CLOSING:
UNTIMEOUT(fsm_timeout, f);
f->state = CLOSED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
break;
case STOPPING:
UNTIMEOUT(fsm_timeout, f);
f->state = STOPPED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
break;
case ACKRCVD:
f->state = REQSENT;
break;
case OPENED:
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0);
break;
}
}
/*
* fsm_timeout - Timeout expired.
*/
static void
fsm_timeout(void *arg)
{
fsm *f = (fsm *) arg;
switch (f->state) {
case LS_CLOSING:
case LS_STOPPING:
if( f->retransmits <= 0 ) {
FSMDEBUG(LOG_WARNING, ("%s: timeout sending Terminate-Request state=%d (%s)\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
/*
* We've waited for an ack long enough. Peer probably heard us.
*/
f->state = (f->state == LS_CLOSING)? LS_CLOSED: LS_STOPPED;
if( f->callbacks->finished ) {
(*f->callbacks->finished)(f);
}
} else {
FSMDEBUG(LOG_WARNING, ("%s: timeout resending Terminate-Requests state=%d (%s)\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
/* Send Terminate-Request */
fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
(u_char *) f->term_reason, f->term_reason_len);
TIMEOUT(fsm_timeout, f, f->timeouttime);
--f->retransmits;
}
break;
case LS_REQSENT:
case LS_ACKRCVD:
case LS_ACKSENT:
if (f->retransmits <= 0) {
FSMDEBUG(LOG_WARNING, ("%s: timeout sending Config-Requests state=%d (%s)\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
f->state = LS_STOPPED;
if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished ) {
(*f->callbacks->finished)(f);
}
} else {
FSMDEBUG(LOG_WARNING, ("%s: timeout resending Config-Request state=%d (%s)\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
/* Retransmit the configure-request */
if (f->callbacks->retransmit) {
(*f->callbacks->retransmit)(f);
}
fsm_sconfreq(f, 1); /* Re-send Configure-Request */
if( f->state == LS_ACKRCVD ) {
f->state = LS_REQSENT;
}
}
break;
default:
FSMDEBUG(LOG_INFO, ("%s: UNHANDLED timeout event in state %d (%s)!\n",
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
}
}
/*
* fsm_timeout - Timeout expired.
*/
static void
fsm_timeout(void *arg)
{
fsm *f = (fsm *) arg;
switch (f->state) {
case CLOSING:
case STOPPING:
if( f->retransmits <= 0 ){
/*
* We've waited for an ack long enough. Peer probably heard us.
*/
f->state = (f->state == CLOSING)? CLOSED: STOPPED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
} else {
/* Send Terminate-Request */
fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
(u_char *) f->term_reason, f->term_reason_len);
TIMEOUT(fsm_timeout, f, f->timeouttime);
--f->retransmits;
}
break;
case REQSENT:
case ACKRCVD:
case ACKSENT:
if (f->retransmits <= 0) {
syslog(LOG_WARNING, "%s: timeout sending Config-Requests",
PROTO_NAME(f));
f->state = STOPPED;
if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
(*f->callbacks->finished)(f);
} else {
/* Retransmit the configure-request */
if (f->callbacks->retransmit)
(*f->callbacks->retransmit)(f);
fsm_sconfreq(f, 1); /* Re-send Configure-Request */
if( f->state == ACKRCVD )
f->state = REQSENT;
}
break;
default:
FSMDEBUG((LOG_INFO, "%s: Timeout event in state %d!",
PROTO_NAME(f), f->state));
}
}
/*
* fsm_timeout - Timeout expired.
*/
static void fsm_timeout(void *arg) {
fsm *f = (fsm *) arg;
ppp_pcb *pcb = f->pcb;
switch (f->state) {
case PPP_FSM_CLOSING:
case PPP_FSM_STOPPING:
if( f->retransmits <= 0 ){
/*
* We've waited for an ack long enough. Peer probably heard us.
*/
f->state = (f->state == PPP_FSM_CLOSING)? PPP_FSM_CLOSED: PPP_FSM_STOPPED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
} else {
/* Send Terminate-Request */
fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
(const u_char *) f->term_reason, f->term_reason_len);
TIMEOUT(fsm_timeout, f, pcb->settings.fsm_timeout_time);
--f->retransmits;
}
break;
case PPP_FSM_REQSENT:
case PPP_FSM_ACKRCVD:
case PPP_FSM_ACKSENT:
if (f->retransmits <= 0) {
ppp_warn("%s: timeout sending Config-Requests", PROTO_NAME(f));
f->state = PPP_FSM_STOPPED;
if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
(*f->callbacks->finished)(f);
} else {
/* Retransmit the configure-request */
if (f->callbacks->retransmit)
(*f->callbacks->retransmit)(f);
fsm_sconfreq(f, 1); /* Re-send Configure-Request */
if( f->state == PPP_FSM_ACKRCVD )
f->state = PPP_FSM_REQSENT;
}
break;
default:
FSMDEBUG(("%s: Timeout event in state %d!", PROTO_NAME(f), f->state));
/* no break */
}
}
/*
* fsm_lowerup - The lower layer is up.
*/
void fsm_lowerup(fsm *f) {
switch( f->state ){
case PPP_FSM_INITIAL:
f->state = PPP_FSM_CLOSED;
break;
case PPP_FSM_STARTING:
if( f->flags & OPT_SILENT )
f->state = PPP_FSM_STOPPED;
else {
/* Send an initial configure-request */
fsm_sconfreq(f, 0);
f->state = PPP_FSM_REQSENT;
}
break;
default:
FSMDEBUG(("%s: Up event in state %d!", PROTO_NAME(f), f->state));
/* no break */
}
}
/*
* fsm_open - Link is allowed to come up.
*/
void
fsm_open(fsm *f)
{
int oldState = f->state;
LWIP_UNUSED_ARG(oldState);
switch( f->state ) {
case LS_INITIAL:
f->state = LS_STARTING;
if( f->callbacks->starting ) {
(*f->callbacks->starting)(f);
}
break;
case LS_CLOSED:
if( f->flags & OPT_SILENT ) {
f->state = LS_STOPPED;
} else {
/* Send an initial configure-request */
fsm_sconfreq(f, 0);
f->state = LS_REQSENT;
}
break;
case LS_CLOSING:
f->state = LS_STOPPING;
/* fall through */
case LS_STOPPED:
case LS_OPENED:
if( f->flags & OPT_RESTART ) {
fsm_lowerdown(f);
fsm_lowerup(f);
}
break;
}
FSMDEBUG(LOG_INFO, ("%s: open state %d (%s) -> %d (%s)\n",
PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
}
/*
* fsm_rconfreq - Receive Configure-Request.
*/
static void
fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len)
{
int code, reject_if_disagree;
FSMDEBUG(LOG_INFO, ("fsm_rconfreq(%s): Rcvd id %d state=%d (%s)\n",
PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
switch( f->state ) {
case LS_CLOSED:
/* Go away, we're closed */
fsm_sdata(f, TERMACK, id, NULL, 0);
return;
case LS_CLOSING:
case LS_STOPPING:
return;
case LS_OPENED:
/* Go down and restart negotiation */
if( f->callbacks->down ) {
(*f->callbacks->down)(f); /* Inform upper layers */
}
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
break;
case LS_STOPPED:
/* Negotiation started by our peer */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = LS_REQSENT;
break;
}
/*
* Pass the requested configuration options
* to protocol-specific code for checking.
*/
if (f->callbacks->reqci) { /* Check CI */
reject_if_disagree = (f->nakloops >= f->maxnakloops);
code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
} else if (len) {
code = CONFREJ; /* Reject all CI */
} else {
code = CONFACK;
}
/* send the Ack, Nak or Rej to the peer */
fsm_sdata(f, (u_char)code, id, inp, len);
if (code == CONFACK) {
if (f->state == LS_ACKRCVD) {
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = LS_OPENED;
if (f->callbacks->up) {
(*f->callbacks->up)(f); /* Inform upper layers */
}
} else {
f->state = LS_ACKSENT;
}
f->nakloops = 0;
} else {
/* we sent CONFACK or CONFREJ */
if (f->state != LS_ACKRCVD) {
f->state = LS_REQSENT;
}
if( code == CONFNAK ) {
++f->nakloops;
}
}
}
/*
* fsm_rconfreq - Receive Configure-Request.
*/
static void fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len) {
int code, reject_if_disagree;
switch( f->state ){
case PPP_FSM_CLOSED:
/* Go away, we're closed */
fsm_sdata(f, TERMACK, id, NULL, 0);
return;
case PPP_FSM_CLOSING:
case PPP_FSM_STOPPING:
return;
case PPP_FSM_OPENED:
/* Go down and restart negotiation */
if( f->callbacks->down )
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = PPP_FSM_REQSENT;
break;
case PPP_FSM_STOPPED:
/* Negotiation started by our peer */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
f->state = PPP_FSM_REQSENT;
break;
default:
break;
}
/*
* Pass the requested configuration options
* to protocol-specific code for checking.
*/
if (f->callbacks->reqci){ /* Check CI */
reject_if_disagree = (f->nakloops >= f->maxnakloops);
code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
} else if (len)
code = CONFREJ; /* Reject all CI */
else
code = CONFACK;
/* send the Ack, Nak or Rej to the peer */
fsm_sdata(f, code, id, inp, len);
if (code == CONFACK) {
if (f->state == PPP_FSM_ACKRCVD) {
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = PPP_FSM_OPENED;
if (f->callbacks->up)
(*f->callbacks->up)(f); /* Inform upper layers */
} else
f->state = PPP_FSM_ACKSENT;
f->nakloops = 0;
} else {
/* we sent CONFACK or CONFREJ */
if (f->state != PPP_FSM_ACKRCVD)
f->state = PPP_FSM_REQSENT;
if( code == CONFNAK )
++f->nakloops;
}
}