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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/pppd/fsm.c	Lines:	0	269	0.0 %
Date:	2017-11-13	Branches:	0	210	0.0 %


/*	$OpenBSD: fsm.c,v 1.8 2009/10/27 23:59:53 deraadt Exp $	*/

/*
 * fsm.c - {Link, IP} Control Protocol Finite State Machine.
 *
 * Copyright (c) 1984-2000 Carnegie Mellon University. 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.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any legal
 *    details, please contact
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <syslog.h>

#include "pppd.h"
#include "fsm.h"

static void fsm_timeout(void *);
static void fsm_rconfreq(fsm *, int, 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)

int peer_mru[NUM_PPP];


/*
 * fsm_init - Initialize fsm.
 *
 * Initialize fsm state.
 */
void
fsm_init(f)
    fsm *f;
{
    f->state = INITIAL;
    f->flags = 0;
    f->id = 0;				/* XXX Start with random id? */
    f->timeouttime = DEFTIMEOUT;
    f->maxconfreqtransmits = DEFMAXCONFREQS;
    f->maxtermtransmits = DEFMAXTERMREQS;
    f->maxnakloops = DEFMAXNAKLOOPS;
    f->term_reason_len = 0;
}


/*
 * fsm_lowerup - The lower layer is up.
 */
void
fsm_lowerup(f)
    fsm *f;
{
    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!",
		  PROTO_NAME(f), f->state));
    }
}


/*
 * fsm_lowerdown - The lower layer is down.
 *
 * Cancel all timeouts and inform upper layers.
 */
void
fsm_lowerdown(f)
    fsm *f;
{
    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!",
		  PROTO_NAME(f), f->state));
    }
}


/*
 * fsm_open - Link is allowed to come up.
 */
void
fsm_open(f)
    fsm *f;
{
    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;
    }
}


/*
 * fsm_close - Start closing connection.
 *
 * Cancel timeouts and either initiate close or possibly go directly to
 * the CLOSED state.
 */
void
fsm_close(f, reason)
    fsm *f;
    char *reason;
{
    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;
    }
}


/*
 * fsm_timeout - Timeout expired.
 */
static void
fsm_timeout(arg)
    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_input - Input packet.
 */
void
fsm_input(f, inpacket, l)
    fsm *f;
    u_char *inpacket;
    int l;
{
    u_char *inp;
    u_char code, id;
    int len;

    /*
     * Parse header (code, id and length).
     * If packet too short, drop it.
     */
    inp = inpacket;
    if (l < HEADERLEN) {
	FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.",
		  f->protocol));
	return;
    }
    GETCHAR(code, inp);
    GETCHAR(id, inp);
    GETSHORT(len, inp);
    if (len < HEADERLEN) {
	FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd illegal length.",
		  f->protocol));
	return;
    }
    if (len > l) {
	FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.",
		  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.",
		  f->protocol, f->state));
	return;
    }

    /*
     * 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_rconfreq - Receive Configure-Request.
 */
static void
fsm_rconfreq(f, id, inp, len)
    fsm *f;
    u_char id;
    u_char *inp;
    int len;
{
    int code, reject_if_disagree;

    FSMDEBUG((LOG_INFO, "fsm_rconfreq(%s): Rcvd id %d.", PROTO_NAME(f), id));
    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, 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(f, id, inp, len)
    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(f, code, id, inp, len)
    fsm *f;
    int code, id;
    u_char *inp;
    int len;
{
    int (*proc)(fsm *, u_char *, int);
    int ret;

    FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d.",
	      PROTO_NAME(f), id));

    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 */
	log_packet(inp, len, "Received bad configure-nak/rej: ", LOG_ERR);
	FSMDEBUG((LOG_INFO, "%s: received bad %s (length %d)",
		  PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), 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_rtermreq - Receive Terminate-Req.
 */
static void
fsm_rtermreq(f, id, p, len)
    fsm *f;
    int id;
    u_char *p;
    int len;
{
    char str[80];

    FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d.",
	      PROTO_NAME(f), id));

    switch (f->state) {
    case ACKRCVD:
    case ACKSENT:
	f->state = REQSENT;		/* Start over but keep trying */
	break;

    case OPENED:
	if (len > 0) {
	    fmtmsg(str, sizeof(str), "%0.*v", len, p);
	    syslog(LOG_INFO, "%s terminated by peer (%s)", PROTO_NAME(f), str);
	} else
	    syslog(LOG_INFO, "%s terminated by peer", 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, id, NULL, 0);
}


/*
 * fsm_rtermack - Receive Terminate-Ack.
 */
static void
fsm_rtermack(f)
    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_rcoderej - Receive an Code-Reject.
 */
static void
fsm_rcoderej(f, inp, len)
    fsm *f;
    u_char *inp;
    int len;
{
    u_char code, id;

    FSMDEBUG((LOG_INFO, "fsm_rcoderej(%s).", PROTO_NAME(f)));

    if (len < HEADERLEN) {
	FSMDEBUG((LOG_INFO, "fsm_rcoderej: Rcvd short Code-Reject packet!"));
	return;
    }
    GETCHAR(code, inp);
    GETCHAR(id, inp);
    syslog(LOG_WARNING, "%s: Rcvd Code-Reject for code %d, id %d",
	   PROTO_NAME(f), code, id);

    if( f->state == ACKRCVD )
	f->state = REQSENT;
}


/*
 * fsm_protreject - Peer doesn't speak this protocol.
 *
 * Treat this as a catastrophic error (RXJ-).
 */
void
fsm_protreject(f)
    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!",
		  PROTO_NAME(f), f->state));
    }
}


/*
 * fsm_sconfreq - Send a Configure-Request.
 */
static void
fsm_sconfreq(f, retransmit)
    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 + PPP_HDRLEN + HEADERLEN;
    if( f->callbacks->cilen && f->callbacks->addci ){
	cilen = (*f->callbacks->cilen)(f);
	if( cilen > peer_mru[f->unit] - 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",
	      PROTO_NAME(f), f->reqid));
}


/*
 * fsm_sdata - Send some data.
 *
 * Used for all packets sent to our peer by this module.
 */
void
fsm_sdata(f, code, id, data, datalen)
    fsm *f;
    u_char code, id;
    u_char *data;
    int datalen;
{
    u_char *outp;
    int outlen;

    /* Adjust length to be smaller than MTU */
    outp = outpacket_buf;
    if (datalen > peer_mru[f->unit] - 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);
    output(f->unit, outpacket_buf, outlen + PPP_HDRLEN);

    FSMDEBUG((LOG_INFO, "fsm_sdata(%s): Sent code %d, id %d.",
	      PROTO_NAME(f), code, id));
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: fsm.c,v 1.8 2009/10/27 23:59:53 deraadt Exp $ */
2
3			/*
4			* fsm.c - {Link, IP} Control Protocol Finite State Machine.
5			*
6			* Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			*
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			*
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in
17			* the documentation and/or other materials provided with the
18			* distribution.
19			*
20			* 3. The name "Carnegie Mellon University" must not be used to
21			* endorse or promote products derived from this software without
22			* prior written permission. For permission or any legal
23			* details, please contact
24			* Office of Technology Transfer
25			* Carnegie Mellon University
26			* 5000 Forbes Avenue
27			* Pittsburgh, PA 15213-3890
28			* (412) 268-4387, fax: (412) 268-7395
29			* tech-transfer@andrew.cmu.edu
30			*
31			* 4. Redistributions of any form whatsoever must retain the following
32			* acknowledgment:
33			* "This product includes software developed by Computing Services
34			* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
35			*
36			* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
37			* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
38			* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
39			* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
40			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
41			* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
42			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43			*/
44
45			/*
46			* TODO:
47			* Randomize fsm id on link/init.
48			* Deal with variable outgoing MTU.
49			*/
50
51			#include <stdio.h>
52			#include <string.h>
53			#include <sys/types.h>
54			#include <syslog.h>
55
56			#include "pppd.h"
57			#include "fsm.h"
58
59			static void fsm_timeout(void *);
60			static void fsm_rconfreq(fsm , int, u_char , int);
61			static void fsm_rconfack(fsm , int, u_char , int);
62			static void fsm_rconfnakrej(fsm , int, int, u_char , int);
63			static void fsm_rtermreq(fsm , int, u_char , int);
64			static void fsm_rtermack(fsm *);
65			static void fsm_rcoderej(fsm , u_char , int);
66			static void fsm_sconfreq(fsm *, int);
67
68			#define PROTO_NAME(f) ((f)->callbacks->proto_name)
69
70			int peer_mru[NUM_PPP];
71
72
73			/*
74			* fsm_init - Initialize fsm.
75			*
76			* Initialize fsm state.
77			*/
78			void
79			fsm_init(f)
80			fsm *f;
81			{
82			f->state = INITIAL;
83			f->flags = 0;
84			f->id = 0; /* XXX Start with random id? */
85			f->timeouttime = DEFTIMEOUT;
86			f->maxconfreqtransmits = DEFMAXCONFREQS;
87			f->maxtermtransmits = DEFMAXTERMREQS;
88			f->maxnakloops = DEFMAXNAKLOOPS;
89			f->term_reason_len = 0;
90			}
91
92
93			/*
94			* fsm_lowerup - The lower layer is up.
95			*/
96			void
97			fsm_lowerup(f)
98			fsm *f;
99			{
100			switch( f->state ){
101			case INITIAL:
102			f->state = CLOSED;
103			break;
104
105			case STARTING:
106			if( f->flags & OPT_SILENT )
107			f->state = STOPPED;
108			else {
109			/* Send an initial configure-request */
110			fsm_sconfreq(f, 0);
111			f->state = REQSENT;
112			}
113			break;
114
115			default:
116			FSMDEBUG((LOG_INFO, "%s: Up event in state %d!",
117			PROTO_NAME(f), f->state));
118			}
119			}
120
121
122			/*
123			* fsm_lowerdown - The lower layer is down.
124			*
125			* Cancel all timeouts and inform upper layers.
126			*/
127			void
128			fsm_lowerdown(f)
129			fsm *f;
130			{
131			switch( f->state ){
132			case CLOSED:
133			f->state = INITIAL;
134			break;
135
136			case STOPPED:
137			f->state = STARTING;
138			if( f->callbacks->starting )
139			(*f->callbacks->starting)(f);
140			break;
141
142			case CLOSING:
143			f->state = INITIAL;
144			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
145			break;
146
147			case STOPPING:
148			case REQSENT:
149			case ACKRCVD:
150			case ACKSENT:
151			f->state = STARTING;
152			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
153			break;
154
155			case OPENED:
156			if( f->callbacks->down )
157			(*f->callbacks->down)(f);
158			f->state = STARTING;
159			break;
160
161			default:
162			FSMDEBUG((LOG_INFO, "%s: Down event in state %d!",
163			PROTO_NAME(f), f->state));
164			}
165			}
166
167
168			/*
169			* fsm_open - Link is allowed to come up.
170			*/
171			void
172			fsm_open(f)
173			fsm *f;
174			{
175			switch( f->state ){
176			case INITIAL:
177			f->state = STARTING;
178			if( f->callbacks->starting )
179			(*f->callbacks->starting)(f);
180			break;
181
182			case CLOSED:
183			if( f->flags & OPT_SILENT )
184			f->state = STOPPED;
185			else {
186			/* Send an initial configure-request */
187			fsm_sconfreq(f, 0);
188			f->state = REQSENT;
189			}
190			break;
191
192			case CLOSING:
193			f->state = STOPPING;
194			/* fall through */
195			case STOPPED:
196			case OPENED:
197			if( f->flags & OPT_RESTART ){
198			fsm_lowerdown(f);
199			fsm_lowerup(f);
200			}
201			break;
202			}
203			}
204
205
206			/*
207			* fsm_close - Start closing connection.
208			*
209			* Cancel timeouts and either initiate close or possibly go directly to
210			* the CLOSED state.
211			*/
212			void
213			fsm_close(f, reason)
214			fsm *f;
215			char *reason;
216			{
217			f->term_reason = reason;
218			f->term_reason_len = (reason == NULL? 0: strlen(reason));
219			switch( f->state ){
220			case STARTING:
221			f->state = INITIAL;
222			break;
223			case STOPPED:
224			f->state = CLOSED;
225			break;
226			case STOPPING:
227			f->state = CLOSING;
228			break;
229
230			case REQSENT:
231			case ACKRCVD:
232			case ACKSENT:
233			case OPENED:
234			if( f->state != OPENED )
235			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
236			else if( f->callbacks->down )
237			(f->callbacks->down)(f); / Inform upper layers we're down */
238
239			/* Init restart counter, send Terminate-Request */
240			f->retransmits = f->maxtermtransmits;
241			fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
242			(u_char *) f->term_reason, f->term_reason_len);
243			TIMEOUT(fsm_timeout, f, f->timeouttime);
244			--f->retransmits;
245
246			f->state = CLOSING;
247			break;
248			}
249			}
250
251
252			/*
253			* fsm_timeout - Timeout expired.
254			*/
255			static void
256			fsm_timeout(arg)
257			void *arg;
258			{
259			fsm f = (fsm ) arg;
260
261			switch (f->state) {
262			case CLOSING:
263			case STOPPING:
264			if( f->retransmits <= 0 ){
265			/*
266			* We've waited for an ack long enough. Peer probably heard us.
267			*/
268			f->state = (f->state == CLOSING)? CLOSED: STOPPED;
269			if( f->callbacks->finished )
270			(*f->callbacks->finished)(f);
271			} else {
272			/* Send Terminate-Request */
273			fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
274			(u_char *) f->term_reason, f->term_reason_len);
275			TIMEOUT(fsm_timeout, f, f->timeouttime);
276			--f->retransmits;
277			}
278			break;
279
280			case REQSENT:
281			case ACKRCVD:
282			case ACKSENT:
283			if (f->retransmits <= 0) {
284			syslog(LOG_WARNING, "%s: timeout sending Config-Requests",
285			PROTO_NAME(f));
286			f->state = STOPPED;
287			if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
288			(*f->callbacks->finished)(f);
289
290			} else {
291			/* Retransmit the configure-request */
292			if (f->callbacks->retransmit)
293			(*f->callbacks->retransmit)(f);
294			fsm_sconfreq(f, 1); /* Re-send Configure-Request */
295			if( f->state == ACKRCVD )
296			f->state = REQSENT;
297			}
298			break;
299
300			default:
301			FSMDEBUG((LOG_INFO, "%s: Timeout event in state %d!",
302			PROTO_NAME(f), f->state));
303			}
304			}
305
306
307			/*
308			* fsm_input - Input packet.
309			*/
310			void
311			fsm_input(f, inpacket, l)
312			fsm *f;
313			u_char *inpacket;
314			int l;
315			{
316			u_char *inp;
317			u_char code, id;
318			int len;
319
320			/*
321			* Parse header (code, id and length).
322			* If packet too short, drop it.
323			*/
324			inp = inpacket;
325			if (l < HEADERLEN) {
326			FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.",
327			f->protocol));
328			return;
329			}
330			GETCHAR(code, inp);
331			GETCHAR(id, inp);
332			GETSHORT(len, inp);
333			if (len < HEADERLEN) {
334			FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd illegal length.",
335			f->protocol));
336			return;
337			}
338			if (len > l) {
339			FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.",
340			f->protocol));
341			return;
342			}
343			len -= HEADERLEN; /* subtract header length */
344
345			if( f->state == INITIAL \|\| f->state == STARTING ){
346			FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd packet in state %d.",
347			f->protocol, f->state));
348			return;
349			}
350
351			/*
352			* Action depends on code.
353			*/
354			switch (code) {
355			case CONFREQ:
356			fsm_rconfreq(f, id, inp, len);
357			break;
358
359			case CONFACK:
360			fsm_rconfack(f, id, inp, len);
361			break;
362
363			case CONFNAK:
364			case CONFREJ:
365			fsm_rconfnakrej(f, code, id, inp, len);
366			break;
367
368			case TERMREQ:
369			fsm_rtermreq(f, id, inp, len);
370			break;
371
372			case TERMACK:
373			fsm_rtermack(f);
374			break;
375
376			case CODEREJ:
377			fsm_rcoderej(f, inp, len);
378			break;
379
380			default:
381			if( !f->callbacks->extcode
382			\|\| !(*f->callbacks->extcode)(f, code, id, inp, len) )
383			fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
384			break;
385			}
386			}
387
388
389			/*
390			* fsm_rconfreq - Receive Configure-Request.
391			*/
392			static void
393			fsm_rconfreq(f, id, inp, len)
394			fsm *f;
395			u_char id;
396			u_char *inp;
397			int len;
398			{
399			int code, reject_if_disagree;
400
401			FSMDEBUG((LOG_INFO, "fsm_rconfreq(%s): Rcvd id %d.", PROTO_NAME(f), id));
402			switch( f->state ){
403			case CLOSED:
404			/* Go away, we're closed */
405			fsm_sdata(f, TERMACK, id, NULL, 0);
406			return;
407			case CLOSING:
408			case STOPPING:
409			return;
410
411			case OPENED:
412			/* Go down and restart negotiation */
413			if( f->callbacks->down )
414			(f->callbacks->down)(f); / Inform upper layers */
415			fsm_sconfreq(f, 0); /* Send initial Configure-Request */
416			break;
417
418			case STOPPED:
419			/* Negotiation started by our peer */
420			fsm_sconfreq(f, 0); /* Send initial Configure-Request */
421			f->state = REQSENT;
422			break;
423			}
424
425			/*
426			* Pass the requested configuration options
427			* to protocol-specific code for checking.
428			*/
429			if (f->callbacks->reqci){ /* Check CI */
430			reject_if_disagree = (f->nakloops >= f->maxnakloops);
431			code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
432			} else if (len)
433			code = CONFREJ; /* Reject all CI */
434			else
435			code = CONFACK;
436
437			/* send the Ack, Nak or Rej to the peer */
438			fsm_sdata(f, code, id, inp, len);
439
440			if (code == CONFACK) {
441			if (f->state == ACKRCVD) {
442			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
443			f->state = OPENED;
444			if (f->callbacks->up)
445			(f->callbacks->up)(f); / Inform upper layers */
446			} else
447			f->state = ACKSENT;
448			f->nakloops = 0;
449
450			} else {
451			/* we sent CONFACK or CONFREJ */
452			if (f->state != ACKRCVD)
453			f->state = REQSENT;
454			if( code == CONFNAK )
455			++f->nakloops;
456			}
457			}
458
459
460			/*
461			* fsm_rconfack - Receive Configure-Ack.
462			*/
463			static void
464			fsm_rconfack(f, id, inp, len)
465			fsm *f;
466			int id;
467			u_char *inp;
468			int len;
469			{
470			FSMDEBUG((LOG_INFO, "fsm_rconfack(%s): Rcvd id %d.",
471			PROTO_NAME(f), id));
472
473			if (id != f->reqid \|\| f->seen_ack) /* Expected id? */
474			return; /* Nope, toss... */
475			if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len):
476			(len == 0)) ){
477			/* Ack is bad - ignore it */
478			log_packet(inp, len, "Received bad configure-ack: ", LOG_ERR);
479			FSMDEBUG((LOG_INFO, "%s: received bad Ack (length %d)",
480			PROTO_NAME(f), len));
481			return;
482			}
483			f->seen_ack = 1;
484
485			switch (f->state) {
486			case CLOSED:
487			case STOPPED:
488			fsm_sdata(f, TERMACK, id, NULL, 0);
489			break;
490
491			case REQSENT:
492			f->state = ACKRCVD;
493			f->retransmits = f->maxconfreqtransmits;
494			break;
495
496			case ACKRCVD:
497			/* Huh? an extra valid Ack? oh well... */
498			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
499			fsm_sconfreq(f, 0);
500			f->state = REQSENT;
501			break;
502
503			case ACKSENT:
504			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
505			f->state = OPENED;
506			f->retransmits = f->maxconfreqtransmits;
507			if (f->callbacks->up)
508			(f->callbacks->up)(f); / Inform upper layers */
509			break;
510
511			case OPENED:
512			/* Go down and restart negotiation */
513			if (f->callbacks->down)
514			(f->callbacks->down)(f); / Inform upper layers */
515			fsm_sconfreq(f, 0); /* Send initial Configure-Request */
516			f->state = REQSENT;
517			break;
518			}
519			}
520
521
522			/*
523			* fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
524			*/
525			static void
526			fsm_rconfnakrej(f, code, id, inp, len)
527			fsm *f;
528			int code, id;
529			u_char *inp;
530			int len;
531			{
532			int (proc)(fsm , u_char *, int);
533			int ret;
534
535			FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d.",
536			PROTO_NAME(f), id));
537
538			if (id != f->reqid \|\| f->seen_ack) /* Expected id? */
539			return; /* Nope, toss... */
540			proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci;
541			if (!proc \|\| !(ret = proc(f, inp, len))) {
542			/* Nak/reject is bad - ignore it */
543			log_packet(inp, len, "Received bad configure-nak/rej: ", LOG_ERR);
544			FSMDEBUG((LOG_INFO, "%s: received bad %s (length %d)",
545			PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len));
546			return;
547			}
548			f->seen_ack = 1;
549
550			switch (f->state) {
551			case CLOSED:
552			case STOPPED:
553			fsm_sdata(f, TERMACK, id, NULL, 0);
554			break;
555
556			case REQSENT:
557			case ACKSENT:
558			/* They didn't agree to what we wanted - try another request */
559			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
560			if (ret < 0)
561			f->state = STOPPED; /* kludge for stopping CCP */
562			else
563			fsm_sconfreq(f, 0); /* Send Configure-Request */
564			break;
565
566			case ACKRCVD:
567			/* Got a Nak/reject when we had already had an Ack?? oh well... */
568			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
569			fsm_sconfreq(f, 0);
570			f->state = REQSENT;
571			break;
572
573			case OPENED:
574			/* Go down and restart negotiation */
575			if (f->callbacks->down)
576			(f->callbacks->down)(f); / Inform upper layers */
577			fsm_sconfreq(f, 0); /* Send initial Configure-Request */
578			f->state = REQSENT;
579			break;
580			}
581			}
582
583
584			/*
585			* fsm_rtermreq - Receive Terminate-Req.
586			*/
587			static void
588			fsm_rtermreq(f, id, p, len)
589			fsm *f;
590			int id;
591			u_char *p;
592			int len;
593			{
594			char str[80];
595
596			FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d.",
597			PROTO_NAME(f), id));
598
599			switch (f->state) {
600			case ACKRCVD:
601			case ACKSENT:
602			f->state = REQSENT; /* Start over but keep trying */
603			break;
604
605			case OPENED:
606			if (len > 0) {
607			fmtmsg(str, sizeof(str), "%0.*v", len, p);
608			syslog(LOG_INFO, "%s terminated by peer (%s)", PROTO_NAME(f), str);
609			} else
610			syslog(LOG_INFO, "%s terminated by peer", PROTO_NAME(f));
611			if (f->callbacks->down)
612			(f->callbacks->down)(f); / Inform upper layers */
613			f->retransmits = 0;
614			f->state = STOPPING;
615			TIMEOUT(fsm_timeout, f, f->timeouttime);
616			break;
617			}
618
619			fsm_sdata(f, TERMACK, id, NULL, 0);
620			}
621
622
623			/*
624			* fsm_rtermack - Receive Terminate-Ack.
625			*/
626			static void
627			fsm_rtermack(f)
628			fsm *f;
629			{
630			FSMDEBUG((LOG_INFO, "fsm_rtermack(%s).", PROTO_NAME(f)));
631
632			switch (f->state) {
633			case CLOSING:
634			UNTIMEOUT(fsm_timeout, f);
635			f->state = CLOSED;
636			if( f->callbacks->finished )
637			(*f->callbacks->finished)(f);
638			break;
639			case STOPPING:
640			UNTIMEOUT(fsm_timeout, f);
641			f->state = STOPPED;
642			if( f->callbacks->finished )
643			(*f->callbacks->finished)(f);
644			break;
645
646			case ACKRCVD:
647			f->state = REQSENT;
648			break;
649
650			case OPENED:
651			if (f->callbacks->down)
652			(f->callbacks->down)(f); / Inform upper layers */
653			fsm_sconfreq(f, 0);
654			break;
655			}
656			}
657
658
659			/*
660			* fsm_rcoderej - Receive an Code-Reject.
661			*/
662			static void
663			fsm_rcoderej(f, inp, len)
664			fsm *f;
665			u_char *inp;
666			int len;
667			{
668			u_char code, id;
669
670			FSMDEBUG((LOG_INFO, "fsm_rcoderej(%s).", PROTO_NAME(f)));
671
672			if (len < HEADERLEN) {
673			FSMDEBUG((LOG_INFO, "fsm_rcoderej: Rcvd short Code-Reject packet!"));
674			return;
675			}
676			GETCHAR(code, inp);
677			GETCHAR(id, inp);
678			syslog(LOG_WARNING, "%s: Rcvd Code-Reject for code %d, id %d",
679			PROTO_NAME(f), code, id);
680
681			if( f->state == ACKRCVD )
682			f->state = REQSENT;
683			}
684
685
686			/*
687			* fsm_protreject - Peer doesn't speak this protocol.
688			*
689			* Treat this as a catastrophic error (RXJ-).
690			*/
691			void
692			fsm_protreject(f)
693			fsm *f;
694			{
695			switch( f->state ){
696			case CLOSING:
697			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
698			/* fall through */
699			case CLOSED:
700			f->state = CLOSED;
701			if( f->callbacks->finished )
702			(*f->callbacks->finished)(f);
703			break;
704
705			case STOPPING:
706			case REQSENT:
707			case ACKRCVD:
708			case ACKSENT:
709			UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
710			/* fall through */
711			case STOPPED:
712			f->state = STOPPED;
713			if( f->callbacks->finished )
714			(*f->callbacks->finished)(f);
715			break;
716
717			case OPENED:
718			if( f->callbacks->down )
719			(*f->callbacks->down)(f);
720
721			/* Init restart counter, send Terminate-Request */
722			f->retransmits = f->maxtermtransmits;
723			fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
724			(u_char *) f->term_reason, f->term_reason_len);
725			TIMEOUT(fsm_timeout, f, f->timeouttime);
726			--f->retransmits;
727
728			f->state = STOPPING;
729			break;
730
731			default:
732			FSMDEBUG((LOG_INFO, "%s: Protocol-reject event in state %d!",
733			PROTO_NAME(f), f->state));
734			}
735			}
736
737
738			/*
739			* fsm_sconfreq - Send a Configure-Request.
740			*/
741			static void
742			fsm_sconfreq(f, retransmit)
743			fsm *f;
744			int retransmit;
745			{
746			u_char *outp;
747			int cilen;
748
749			if( f->state != REQSENT && f->state != ACKRCVD && f->state != ACKSENT ){
750			/* Not currently negotiating - reset options */
751			if( f->callbacks->resetci )
752			(*f->callbacks->resetci)(f);
753			f->nakloops = 0;
754			}
755
756			if( !retransmit ){
757			/* New request - reset retransmission counter, use new ID */
758			f->retransmits = f->maxconfreqtransmits;
759			f->reqid = ++f->id;
760			}
761
762			f->seen_ack = 0;
763
764			/*
765			* Make up the request packet
766			*/
767			outp = outpacket_buf + PPP_HDRLEN + HEADERLEN;
768			if( f->callbacks->cilen && f->callbacks->addci ){
769			cilen = (*f->callbacks->cilen)(f);
770			if( cilen > peer_mru[f->unit] - HEADERLEN )
771			cilen = peer_mru[f->unit] - HEADERLEN;
772			if (f->callbacks->addci)
773			(*f->callbacks->addci)(f, outp, &cilen);
774			} else
775			cilen = 0;
776
777			/* send the request to our peer */
778			fsm_sdata(f, CONFREQ, f->reqid, outp, cilen);
779
780			/* start the retransmit timer */
781			--f->retransmits;
782			TIMEOUT(fsm_timeout, f, f->timeouttime);
783
784			FSMDEBUG((LOG_INFO, "%s: sending Configure-Request, id %d",
785			PROTO_NAME(f), f->reqid));
786			}
787
788
789			/*
790			* fsm_sdata - Send some data.
791			*
792			* Used for all packets sent to our peer by this module.
793			*/
794			void
795			fsm_sdata(f, code, id, data, datalen)
796			fsm *f;
797			u_char code, id;
798			u_char *data;
799			int datalen;
800			{
801			u_char *outp;
802			int outlen;
803
804			/* Adjust length to be smaller than MTU */
805			outp = outpacket_buf;
806			if (datalen > peer_mru[f->unit] - HEADERLEN)
807			datalen = peer_mru[f->unit] - HEADERLEN;
808			if (datalen && data != outp + PPP_HDRLEN + HEADERLEN)
809			BCOPY(data, outp + PPP_HDRLEN + HEADERLEN, datalen);
810			outlen = datalen + HEADERLEN;
811			MAKEHEADER(outp, f->protocol);
812			PUTCHAR(code, outp);
813			PUTCHAR(id, outp);
814			PUTSHORT(outlen, outp);
815			output(f->unit, outpacket_buf, outlen + PPP_HDRLEN);
816
817			FSMDEBUG((LOG_INFO, "fsm_sdata(%s): Sent code %d, id %d.",
818			PROTO_NAME(f), code, id));
819			}