root/webserver/example/freeRTOS/Demo/Common/ethernet/lwIP/netif/ppp/fsm.c

/*****************************************************************************
* fsm.c - Network Control Protocol Finite State Machine program file.
*
* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
* portions Copyright (c) 1997 by Global Election Systems Inc.
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice and the following disclaimer are included verbatim in any 
* distributions. No written agreement, license, or royalty fee is required
* for any of the authorized uses.
*
* THIS SOFTWARE IS PROVIDED BY THE 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 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.
*
******************************************************************************
* REVISION HISTORY
*
* 03-01-01 Marc Boucher <marc@mbsi.ca>
*   Ported to lwIP.
* 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
*       Original based on BSD fsm.c.
*****************************************************************************/
/*
 * fsm.c - {Link, IP} Control Protocol Finite State Machine.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */


/*
 * TODO:
 * Randomize fsm id on link/init.
 * Deal with variable outgoing MTU.
 */

#include "ppp.h"
#if PPP_SUPPORT > 0
#include "fsm.h"
#include "pppdebug.h"


/*************************/
/*** LOCAL DEFINITIONS ***/
/*************************/


/************************/
/*** LOCAL DATA TYPES ***/
/************************/


/***********************************/
/*** LOCAL FUNCTION DECLARATIONS ***/
/***********************************/
static void fsm_timeout (void *);
static void fsm_rconfreq (fsm *, u_char, u_char *, int);
static void fsm_rconfack (fsm *, int, u_char *, int);
static void fsm_rconfnakrej (fsm *, int, int, u_char *, int);
static void fsm_rtermreq (fsm *, int, u_char *, int);
static void fsm_rtermack (fsm *);
static void fsm_rcoderej (fsm *, u_char *, int);
static void fsm_sconfreq (fsm *, int);

#define PROTO_NAME(f)   ((f)->callbacks->proto_name)


/******************************/
/*** PUBLIC DATA STRUCTURES ***/
/******************************/


/*****************************/
/*** LOCAL DATA STRUCTURES ***/
/*****************************/
int peer_mru[NUM_PPP];


/***********************************/
/*** PUBLIC FUNCTION DEFINITIONS ***/
/***********************************/

/*
 * fsm_init - Initialize fsm.
 *
 * Initialize fsm state.
 */
void fsm_init(fsm *f)
{
        f->state = INITIAL;
        f->flags = 0;
        f->id = 0;                              /* XXX Start with random id? */
        f->timeouttime = FSM_DEFTIMEOUT;
        f->maxconfreqtransmits = FSM_DEFMAXCONFREQS;
        f->maxtermtransmits = FSM_DEFMAXTERMREQS;
        f->maxnakloops = FSM_DEFMAXNAKLOOPS;
        f->term_reason_len = 0;
}


/*
 * fsm_lowerup - The lower layer is up.
 */
void fsm_lowerup(fsm *f)
{
        int oldState = f->state;

        switch( f->state ){
        case INITIAL:
                f->state = CLOSED;
                break;
        
        case STARTING:
                if( f->flags & OPT_SILENT )
                        f->state = STOPPED;
                else {
                        /* Send an initial configure-request */
                        fsm_sconfreq(f, 0);
                        f->state = REQSENT;
                }
        break;
        
        default:
                FSMDEBUG((LOG_INFO, "%s: Up event in state %d!\n",
                                PROTO_NAME(f), f->state));
        }
        
        FSMDEBUG((LOG_INFO, "%s: lowerup state %d -> %d\n",
                        PROTO_NAME(f), oldState, f->state));
}


/*
 * fsm_lowerdown - The lower layer is down.
 *
 * Cancel all timeouts and inform upper layers.
 */
void fsm_lowerdown(fsm *f)
{
        int oldState = f->state;
        
        switch( f->state ){
        case CLOSED:
                f->state = INITIAL;
                break;
        
        case STOPPED:
                f->state = STARTING;
                if( f->callbacks->starting )
                        (*f->callbacks->starting)(f);
                break;
        
        case CLOSING:
                f->state = INITIAL;
                UNTIMEOUT(fsm_timeout, f);      /* Cancel timeout */
                break;
        
        case STOPPING:
        case REQSENT:
        case ACKRCVD:
        case ACKSENT:
                f->state = STARTING;
                UNTIMEOUT(fsm_timeout, f);      /* Cancel timeout */
                break;
        
        case OPENED:
                if( f->callbacks->down )
                        (*f->callbacks->down)(f);
                f->state = STARTING;
                break;
        
        default:
                FSMDEBUG((LOG_INFO, "%s: Down event in state %d!\n",
                                PROTO_NAME(f), f->state));
        }
        
        FSMDEBUG((LOG_INFO, "%s: lowerdown state %d -> %d\n",
                        PROTO_NAME(f), oldState, f->state));
}


/*
 * fsm_open - Link is allowed to come up.
 */
void fsm_open(fsm *f)
{
        int oldState = f->state;
        
        switch( f->state ){
                case INITIAL:
                        f->state = STARTING;
                        if( f->callbacks->starting )
                                (*f->callbacks->starting)(f);
                        break;
                
                case CLOSED:
                if( f->flags & OPT_SILENT )
                        f->state = STOPPED;
                else {
                        /* Send an initial configure-request */
                        fsm_sconfreq(f, 0);
                        f->state = REQSENT;
                }
                break;
        
        case CLOSING:
                f->state = STOPPING;
                /* fall through */
        case STOPPED:
        case OPENED:
                if( f->flags & OPT_RESTART ){
                        fsm_lowerdown(f);
                        fsm_lowerup(f);
                }
                break;
        }
        
        FSMDEBUG((LOG_INFO, "%s: open state %d -> %d\n",
                        PROTO_NAME(f), oldState, f->state));
}


/*
 * fsm_close - Start closing connection.
 *
 * Cancel timeouts and either initiate close or possibly go directly to
 * the CLOSED state.
 */
void fsm_close(fsm *f, char *reason)
{
        int oldState = f->state;
        
        f->term_reason = reason;
        f->term_reason_len = (reason == NULL? 0: strlen(reason));
        switch( f->state ){
        case STARTING:
                f->state = INITIAL;
                break;
        case STOPPED:
                f->state = CLOSED;
                break;
        case STOPPING:
                f->state = CLOSING;
                break;
        
        case REQSENT:
        case ACKRCVD:
        case ACKSENT:
        case OPENED:
                if( f->state != OPENED )
                        UNTIMEOUT(fsm_timeout, f);      /* Cancel timeout */
                else if( f->callbacks->down )
                        (*f->callbacks->down)(f);       /* Inform upper layers we're down */
                
                /* Init restart counter, send Terminate-Request */
                f->retransmits = f->maxtermtransmits;
                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;
                
                f->state = CLOSING;
                break;
        }
        
        FSMDEBUG((LOG_INFO, "%s: close reason=%s state %d -> %d\n",
                        PROTO_NAME(f), reason, oldState, f->state));
}


/*
 * fsm_sdata - Send some data.
 *
 * Used for all packets sent to our peer by this module.
 */
void fsm_sdata(
        fsm *f,
        u_char code, 
        u_char id,
        u_char *data,
        int datalen
)
{
        u_char *outp;
        int outlen;
        
        /* Adjust length to be smaller than MTU */
        outp = outpacket_buf[f->unit];
        if (datalen > peer_mru[f->unit] - (int)HEADERLEN)
                datalen = peer_mru[f->unit] - HEADERLEN;
        if (datalen && data != outp + PPP_HDRLEN + HEADERLEN)
                BCOPY(data, outp + PPP_HDRLEN + HEADERLEN, datalen);
        outlen = datalen + HEADERLEN;
        MAKEHEADER(outp, f->protocol);
        PUTCHAR(code, outp);
        PUTCHAR(id, outp);
        PUTSHORT(outlen, outp);
        pppWrite(f->unit, outpacket_buf[f->unit], outlen + PPP_HDRLEN);
        FSMDEBUG((LOG_INFO, "fsm_sdata(%s): Sent code %d,%d,%d.\n",
                                PROTO_NAME(f), code, id, outlen));
}


/*
 * fsm_input - Input packet.
 */
void fsm_input(fsm *f, u_char *inpacket, int l)
{
        u_char *inp = inpacket;
        u_char code, id;
        int len;
        
        /*
        * Parse header (code, id and length).
        * If packet too short, drop it.
        */
        if (l < HEADERLEN) {
                FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.\n",
                                        f->protocol));
                return;
        }
        GETCHAR(code, inp);
        GETCHAR(id, inp);
        GETSHORT(len, inp);
        if (len < HEADERLEN) {
                FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd illegal length.\n",
                                f->protocol));
                return;
        }
        if (len > l) {
                FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.\n",
                                f->protocol));
                return;
        }
        len -= HEADERLEN;               /* subtract header length */
        
        if( f->state == INITIAL || f->state == STARTING ){
                FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd packet in state %d.\n",
                                f->protocol, f->state));
                return;
        }
        FSMDEBUG((LOG_INFO, "fsm_input(%s):%d,%d,%d\n", PROTO_NAME(f), code, id, l));
        /*
         * Action depends on code.
         */
        switch (code) {
        case CONFREQ:
                fsm_rconfreq(f, id, inp, len);
                break;
        
        case CONFACK:
                fsm_rconfack(f, id, inp, len);
                break;
        
        case CONFNAK:
        case CONFREJ:
                fsm_rconfnakrej(f, code, id, inp, len);
                break;
        
        case TERMREQ:
                fsm_rtermreq(f, id, inp, len);
                break;
        
        case TERMACK:
                fsm_rtermack(f);
                break;
        
        case CODEREJ:
                fsm_rcoderej(f, inp, len);
                break;
        
        default:
                if( !f->callbacks->extcode
                                || !(*f->callbacks->extcode)(f, code, id, inp, len) )
                        fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
                break;
        }
}


/*
 * fsm_protreject - Peer doesn't speak this protocol.
 *
 * Treat this as a catastrophic error (RXJ-).
 */
void fsm_protreject(fsm *f)
{
        switch( f->state ){
        case CLOSING:
                UNTIMEOUT(fsm_timeout, f);      /* Cancel timeout */
                /* fall through */
        case CLOSED:
                f->state = CLOSED;
                if( f->callbacks->finished )
                        (*f->callbacks->finished)(f);
                break;
        
        case STOPPING:
        case REQSENT:
        case ACKRCVD:
        case ACKSENT:
                UNTIMEOUT(fsm_timeout, f);      /* Cancel timeout */
                /* fall through */
        case STOPPED:
                f->state = STOPPED;
                if( f->callbacks->finished )
                        (*f->callbacks->finished)(f);
                break;
        
        case OPENED:
                if( f->callbacks->down )
                        (*f->callbacks->down)(f);
                
                /* Init restart counter, send Terminate-Request */
                f->retransmits = f->maxtermtransmits;
                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;
                
                f->state = STOPPING;
                break;
        
        default:
                FSMDEBUG((LOG_INFO, "%s: Protocol-reject event in state %d!\n",
                                        PROTO_NAME(f), f->state));
        }
}





/**********************************/
/*** LOCAL FUNCTION DEFINITIONS ***/
/**********************************/

/*
 * 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 ){
                    FSMDEBUG((LOG_WARNING, "%s: timeout sending Terminate-Request state=%d\n",
                                           PROTO_NAME(f), f->state));
                    /*
                     * 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 {
                    FSMDEBUG((LOG_WARNING, "%s: timeout resending Terminate-Requests state=%d\n",
                                           PROTO_NAME(f), 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 REQSENT:
    case ACKRCVD:
    case ACKSENT:
                if (f->retransmits <= 0) {
                    FSMDEBUG((LOG_WARNING, "%s: timeout sending Config-Requests state=%d\n",
                           PROTO_NAME(f), f->state));
                    f->state = 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\n",
                           PROTO_NAME(f), 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 == ACKRCVD )
                                f->state = REQSENT;
                }
                break;

    default:
                FSMDEBUG((LOG_INFO, "%s: Timeout event in state %d!\n",
                                  PROTO_NAME(f), 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\n", 
                                PROTO_NAME(f), id, f->state));
        switch( f->state ){
        case CLOSED:
                /* Go away, we're closed */
                fsm_sdata(f, TERMACK, id, NULL, 0);
                return;
        case CLOSING:
        case STOPPING:
                return;
        
        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 */
                break;
        
        case STOPPED:
                /* Negotiation started by our peer */
                fsm_sconfreq(f, 0);             /* Send initial Configure-Request */
                f->state = 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 == ACKRCVD) {
                        UNTIMEOUT(fsm_timeout, f);      /* Cancel timeout */
                        f->state = OPENED;
                        if (f->callbacks->up)
                                (*f->callbacks->up)(f); /* Inform upper layers */
                } 
                else
                        f->state = ACKSENT;
                f->nakloops = 0;
        } 
        else {
                /* we sent CONFACK or CONFREJ */
                if (f->state != ACKRCVD)
                        f->state = REQSENT;
                if( code == CONFNAK )
                        ++f->nakloops;
        }
}


/*
 * 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\n",
                                PROTO_NAME(f), id, 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 CLOSED:
        case STOPPED:
                fsm_sdata(f, TERMACK, (u_char)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;
        
        FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d state=%d\n",
                                PROTO_NAME(f), id, 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 CLOSED:
        case STOPPED:
                fsm_sdata(f, TERMACK, (u_char)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_rtermreq - Receive Terminate-Req.
 */
static void fsm_rtermreq(fsm *f, int id, u_char *p, int len)
{
        FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d state=%d\n",
                                PROTO_NAME(f), id, f->state));
        
        switch (f->state) {
        case ACKRCVD:
        case ACKSENT:
                f->state = REQSENT;             /* Start over but keep trying */
                break;
        
        case OPENED:
                if (len > 0) {
                        FSMDEBUG((LOG_INFO, "%s terminated by peer (%x)\n", PROTO_NAME(f), p));
                } else {
                        FSMDEBUG((LOG_INFO, "%s terminated by peer\n", PROTO_NAME(f)));
                }
                if (f->callbacks->down)
                        (*f->callbacks->down)(f);       /* Inform upper layers */
                f->retransmits = 0;
                f->state = STOPPING;
                TIMEOUT(fsm_timeout, f, f->timeouttime);
                break;
        }
        
        fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
}


/*
 * fsm_rtermack - Receive Terminate-Ack.
 */
static void fsm_rtermack(fsm *f)
{
        FSMDEBUG((LOG_INFO, "fsm_rtermack(%s): state=%d\n", 
                                PROTO_NAME(f), f->state));
        
        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_rcoderej - Receive an Code-Reject.
 */
static void fsm_rcoderej(fsm *f, u_char *inp, int len)
{
        u_char code, id;
        
        FSMDEBUG((LOG_INFO, "fsm_rcoderej(%s): state=%d\n", 
                                PROTO_NAME(f), f->state));
        
        if (len < HEADERLEN) {
                FSMDEBUG((LOG_INFO, "fsm_rcoderej: Rcvd short Code-Reject packet!\n"));
                return;
        }
        GETCHAR(code, inp);
        GETCHAR(id, inp);
        FSMDEBUG((LOG_WARNING, "%s: Rcvd Code-Reject for code %d, id %d\n",
                                PROTO_NAME(f), code, id));
        
        if( f->state == ACKRCVD )
                f->state = REQSENT;
}


/*
 * fsm_sconfreq - Send a Configure-Request.
 */
static void fsm_sconfreq(fsm *f, int retransmit)
{
        u_char *outp;
        int cilen;
        
        if( f->state != REQSENT && f->state != ACKRCVD && f->state != ACKSENT ){
                /* Not currently negotiating - reset options */
                if( f->callbacks->resetci )
                        (*f->callbacks->resetci)(f);
                f->nakloops = 0;
                }
        
        if( !retransmit ){
                /* New request - reset retransmission counter, use new ID */
                f->retransmits = f->maxconfreqtransmits;
                f->reqid = ++f->id;
        }
        
        f->seen_ack = 0;
        
        /*
         * Make up the request packet
         */
        outp = outpacket_buf[f->unit] + PPP_HDRLEN + HEADERLEN;
        if( f->callbacks->cilen && f->callbacks->addci ){
                cilen = (*f->callbacks->cilen)(f);
                if( cilen > peer_mru[f->unit] - (int)HEADERLEN )
                        cilen = peer_mru[f->unit] - HEADERLEN;
                if (f->callbacks->addci)
                        (*f->callbacks->addci)(f, outp, &cilen);
        } else
                cilen = 0;
        
        /* send the request to our peer */
        fsm_sdata(f, CONFREQ, f->reqid, outp, cilen);
        
        /* start the retransmit timer */
        --f->retransmits;
        TIMEOUT(fsm_timeout, f, f->timeouttime);
        
        FSMDEBUG((LOG_INFO, "%s: sending Configure-Request, id %d\n",
                                PROTO_NAME(f), f->reqid));
}

#endif /* PPP_SUPPORT */