748 lines
17 KiB
C
748 lines
17 KiB
C
/*
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* fsm.c - {Link, IP} Control Protocol Finite State Machine.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char rcsid[] = "$Id: fsm.c,v 1.1 1997/03/07 16:01:15 hipp Exp $";
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#endif
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/*
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* TODO:
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* Randomize fsm id on link/init.
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* Deal with variable outgoing MTU.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <syslog.h>
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#include "fsm.h"
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#include "pppd.h"
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#include "lcp.h"
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extern char *proto_name();
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static void fsm_timeout __P((caddr_t));
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static void fsm_rconfreq __P((fsm *, int, u_char *, int));
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static void fsm_rconfack __P((fsm *, int, u_char *, int));
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static void fsm_rconfnakrej __P((fsm *, int, int, u_char *, int));
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static void fsm_rtermreq __P((fsm *, int, u_char *, int));
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static void fsm_rtermack __P((fsm *));
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static void fsm_rcoderej __P((fsm *, u_char *, int));
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static void fsm_sconfreq __P((fsm *, int));
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#define PROTO_NAME(f) ((f)->callbacks->proto_name)
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/*
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* fsm_init - Initialize fsm.
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*
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* Initialize fsm state.
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*/
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void fsm_init(fsm *f)
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{
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f->state = INITIAL;
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f->flags = 0;
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f->id = 0; /* XXX Start with random id? */
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f->timeouttime = DEFTIMEOUT;
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f->maxconfreqtransmits = DEFMAXCONFREQS;
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f->maxtermtransmits = DEFMAXTERMREQS;
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f->maxnakloops = DEFMAXNAKLOOPS;
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f->term_reason_len = 0;
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}
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/*
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* fsm_lowerup - The lower layer is up.
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*/
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void fsm_lowerup(fsm *f)
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{
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switch( f->state ){
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case INITIAL:
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f->state = CLOSED;
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break;
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case STARTING:
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if( f->flags & OPT_SILENT )
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f->state = STOPPED;
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else {
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/* Send an initial configure-request */
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fsm_sconfreq(f, 0);
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f->state = REQSENT;
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}
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break;
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default:
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FSMDEBUG((LOG_INFO, "%s: Up event in state %d!",
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PROTO_NAME(f), f->state));
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}
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}
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/*
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* fsm_lowerdown - The lower layer is down.
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*
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* Cancel all timeouts and inform upper layers.
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*/
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void fsm_lowerdown(fsm *f)
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{
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switch( f->state ){
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case CLOSED:
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f->state = INITIAL;
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break;
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case STOPPED:
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f->state = STARTING;
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if( f->callbacks->starting )
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(*f->callbacks->starting)(f);
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break;
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case CLOSING:
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f->state = INITIAL;
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UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
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break;
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case STOPPING:
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case REQSENT:
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case ACKRCVD:
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case ACKSENT:
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f->state = STARTING;
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UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
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break;
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case OPENED:
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if( f->callbacks->down )
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(*f->callbacks->down)(f);
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f->state = STARTING;
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break;
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default:
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FSMDEBUG((LOG_INFO, "%s: Down event in state %d!",
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PROTO_NAME(f), f->state));
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}
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}
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/*
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* fsm_open - Link is allowed to come up.
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*/
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void fsm_open(fsm *f)
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{
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switch( f->state ){
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case INITIAL:
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f->state = STARTING;
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if( f->callbacks->starting )
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(*f->callbacks->starting)(f);
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break;
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case CLOSED:
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if( f->flags & OPT_SILENT )
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f->state = STOPPED;
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else {
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/* Send an initial configure-request */
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fsm_sconfreq(f, 0);
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f->state = REQSENT;
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}
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break;
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case CLOSING:
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f->state = STOPPING;
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/* fall through */
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case STOPPED:
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case OPENED:
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if( f->flags & OPT_RESTART ){
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fsm_lowerdown(f);
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fsm_lowerup(f);
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}
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break;
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}
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}
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/*
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* fsm_close - Start closing connection.
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*
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* Cancel timeouts and either initiate close or possibly go directly to
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* the CLOSED state.
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*/
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void fsm_close(fsm *f,char *reason)
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{
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f->term_reason = reason;
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f->term_reason_len = (reason == NULL? 0: strlen(reason));
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switch( f->state ){
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case STARTING:
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f->state = INITIAL;
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break;
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case STOPPED:
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f->state = CLOSED;
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break;
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case STOPPING:
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f->state = CLOSING;
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break;
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case REQSENT:
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case ACKRCVD:
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case ACKSENT:
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case OPENED:
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if( f->state != OPENED )
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UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
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else if( f->callbacks->down )
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(*f->callbacks->down)(f); /* Inform upper layers we're down */
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/* Init restart counter, send Terminate-Request */
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f->retransmits = f->maxtermtransmits;
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fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
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(u_char *) f->term_reason, f->term_reason_len);
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TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
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--f->retransmits;
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f->state = CLOSING;
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break;
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}
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}
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/*
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* fsm_timeout - Timeout expired.
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*/
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static void fsm_timeout(caddr_t arg)
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{
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fsm *f = (fsm *) arg;
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switch (f->state) {
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case CLOSING:
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case STOPPING:
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if( f->retransmits <= 0 ){
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/*
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* We've waited for an ack long enough. Peer probably heard us.
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*/
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f->state = (f->state == CLOSING)? CLOSED: STOPPED;
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if( f->callbacks->finished )
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(*f->callbacks->finished)(f);
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} else {
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/* Send Terminate-Request */
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fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
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(u_char *) f->term_reason, f->term_reason_len);
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TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
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--f->retransmits;
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}
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break;
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case REQSENT:
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case ACKRCVD:
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case ACKSENT:
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if (f->retransmits <= 0) {
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syslog(LOG_WARNING, "%s: timeout sending Config-Requests",
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PROTO_NAME(f));
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f->state = STOPPED;
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if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
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(*f->callbacks->finished)(f);
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} else {
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/* Retransmit the configure-request */
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if (f->callbacks->retransmit)
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(*f->callbacks->retransmit)(f);
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fsm_sconfreq(f, 1); /* Re-send Configure-Request */
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if( f->state == ACKRCVD )
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f->state = REQSENT;
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}
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break;
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default:
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FSMDEBUG((LOG_INFO, "%s: Timeout event in state %d!",
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PROTO_NAME(f), f->state));
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}
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}
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/*
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* fsm_input - Input packet.
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*/
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void fsm_input(fsm *f,u_char *inpacket,int l)
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{
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u_char *inp;
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u_char code, id;
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int len;
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/*
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* Parse header (code, id and length).
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* If packet too short, drop it.
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*/
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inp = inpacket;
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if (l < HEADERLEN) {
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FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.",
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f->protocol));
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return;
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}
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GETCHAR(code, inp);
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GETCHAR(id, inp);
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GETSHORT(len, inp);
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if (len < HEADERLEN) {
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FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd illegal length.",
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f->protocol));
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return;
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}
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if (len > l) {
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FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.",
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f->protocol));
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return;
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}
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len -= HEADERLEN; /* subtract header length */
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if( f->state == INITIAL || f->state == STARTING ){
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FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd packet in state %d.",
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f->protocol, f->state));
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return;
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}
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/*
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* Action depends on code.
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*/
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switch (code) {
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case CONFREQ:
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fsm_rconfreq(f, id, inp, len);
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break;
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case CONFACK:
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fsm_rconfack(f, id, inp, len);
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break;
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case CONFNAK:
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case CONFREJ:
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fsm_rconfnakrej(f, code, id, inp, len);
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break;
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case TERMREQ:
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fsm_rtermreq(f, id, inp, len);
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break;
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case TERMACK:
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fsm_rtermack(f);
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break;
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case CODEREJ:
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fsm_rcoderej(f, inp, len);
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break;
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default:
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if( !f->callbacks->extcode
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|| !(*f->callbacks->extcode)(f, code, id, inp, len) )
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fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
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break;
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}
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}
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/*
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* fsm_rconfreq - Receive Configure-Request.
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*/
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static void fsm_rconfreq(fsm *f,int id,u_char *inp,int len)
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{
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int code, reject_if_disagree;
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FSMDEBUG((LOG_INFO, "fsm_rconfreq(%s): Rcvd id %d.", PROTO_NAME(f), id));
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switch( f->state ){
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case CLOSED:
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/* Go away, we're closed */
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fsm_sdata(f, TERMACK, id, NULL, 0);
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return;
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case CLOSING:
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case STOPPING:
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return;
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case OPENED:
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/* Go down and restart negotiation */
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if( f->callbacks->down )
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(*f->callbacks->down)(f); /* Inform upper layers */
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fsm_sconfreq(f, 0); /* Send initial Configure-Request */
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break;
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case STOPPED:
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/* Negotiation started by our peer */
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fsm_sconfreq(f, 0); /* Send initial Configure-Request */
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f->state = REQSENT;
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break;
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}
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/*
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* Pass the requested configuration options
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* to protocol-specific code for checking.
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*/
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if (f->callbacks->reqci){ /* Check CI */
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reject_if_disagree = (f->nakloops >= f->maxnakloops);
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code = (*f->callbacks->reqci)(f, inp, &len, reject_if_disagree);
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} else if (len)
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code = CONFREJ; /* Reject all CI */
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else
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code = CONFACK;
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/* send the Ack, Nak or Rej to the peer */
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fsm_sdata(f, code, id, inp, len);
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if (code == CONFACK) {
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if (f->state == ACKRCVD) {
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UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
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f->state = OPENED;
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if (f->callbacks->up)
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(*f->callbacks->up)(f); /* Inform upper layers */
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} else
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f->state = ACKSENT;
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f->nakloops = 0;
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} else {
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/* we sent CONFACK or CONFREJ */
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if (f->state != ACKRCVD)
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f->state = REQSENT;
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if( code == CONFNAK )
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++f->nakloops;
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}
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}
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/*
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* fsm_rconfack - Receive Configure-Ack.
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*/
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static void fsm_rconfack(fsm *f,int id,u_char *inp,int len)
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{
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FSMDEBUG((LOG_INFO, "fsm_rconfack(%s): Rcvd id %d.",
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PROTO_NAME(f), id));
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if (id != f->reqid || f->seen_ack) /* Expected id? */
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return; /* Nope, toss... */
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if( !(f->callbacks->ackci? (*f->callbacks->ackci)(f, inp, len):
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(len == 0)) ){
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/* Ack is bad - ignore it */
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FSMDEBUG((LOG_INFO, "%s: received bad Ack (length %d)",
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PROTO_NAME(f), len));
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return;
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}
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f->seen_ack = 1;
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switch (f->state) {
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case CLOSED:
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case STOPPED:
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fsm_sdata(f, TERMACK, id, NULL, 0);
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break;
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case REQSENT:
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f->state = ACKRCVD;
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f->retransmits = f->maxconfreqtransmits;
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break;
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case ACKRCVD:
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/* Huh? an extra valid Ack? oh well... */
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UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
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fsm_sconfreq(f, 0);
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f->state = REQSENT;
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break;
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case ACKSENT:
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UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
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f->state = OPENED;
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f->retransmits = f->maxconfreqtransmits;
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if (f->callbacks->up)
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(*f->callbacks->up)(f); /* Inform upper layers */
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break;
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case OPENED:
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/* Go down and restart negotiation */
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if (f->callbacks->down)
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(*f->callbacks->down)(f); /* Inform upper layers */
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fsm_sconfreq(f, 0); /* Send initial Configure-Request */
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f->state = REQSENT;
|
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break;
|
|
}
|
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}
|
|
|
|
|
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/*
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* fsm_rconfnakrej - Receive Configure-Nak or Configure-Reject.
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*/
|
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static void fsm_rconfnakrej(fsm *f,int code,int id,u_char *inp,int len)
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{
|
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int (*proc)();
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int ret;
|
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|
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FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d.",
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PROTO_NAME(f), id));
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|
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if (id != f->reqid || f->seen_ack) /* Expected id? */
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return; /* Nope, toss... */
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proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci;
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if (!proc || !(ret = proc(f, inp, len))) {
|
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/* Nak/reject is bad - ignore it */
|
|
FSMDEBUG((LOG_INFO, "%s: received bad %s (length %d)",
|
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PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len));
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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, (caddr_t) f); /* Cancel timeout */
|
|
if (ret < 0)
|
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f->state = STOPPED; /* kludge for stopping CCP */
|
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else
|
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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, (caddr_t) 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)
|
|
{
|
|
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, (caddr_t) f, f->timeouttime);
|
|
break;
|
|
}
|
|
|
|
fsm_sdata(f, TERMACK, id, NULL, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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, (caddr_t) f);
|
|
f->state = CLOSED;
|
|
if( f->callbacks->finished )
|
|
(*f->callbacks->finished)(f);
|
|
break;
|
|
case STOPPING:
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) 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).", 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(fsm *f)
|
|
{
|
|
switch( f->state ){
|
|
case CLOSING:
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) 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, (caddr_t) 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, (caddr_t) 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(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 > lns[f->unit].peer_mru - HEADERLEN )
|
|
cilen = lns[f->unit].peer_mru - 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, (caddr_t) 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(fsm *f,int code,int id,u_char *data,int datalen)
|
|
{
|
|
u_char *outp;
|
|
int outlen;
|
|
|
|
/* Adjust length to be smaller than MTU */
|
|
outp = outpacket_buf;
|
|
if (datalen > lns[f->unit].peer_mru - HEADERLEN)
|
|
datalen = lns[f->unit].peer_mru - 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));
|
|
}
|
|
|
|
|
|
|
|
|