/*
* fsm.c - {Link, IP} Control Protocol Finite State Machine.
*
- * Copyright (c) 1989 Carnegie Mellon University.
- * All rights reserved.
+ * Copyright (c) 1984-2000 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.
+ * 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.
*/
-#ifndef lint
-static char rcsid[] = "$Id: fsm.c,v 1.10 1995/12/18 03:44:42 paulus Exp $";
-#endif
+#define RCSID "$Id: fsm.c,v 1.23 2004/11/13 02:28:15 paulus Exp $"
/*
* TODO:
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
-#include <syslog.h>
#include "pppd.h"
#include "fsm.h"
-extern char *proto_name();
+static const char rcsid[] = RCSID;
-static void fsm_timeout __P((caddr_t));
+static void fsm_timeout __P((void *));
static void fsm_rconfreq __P((fsm *, int, u_char *, int));
static void fsm_rconfack __P((fsm *, int, u_char *, int));
static void fsm_rconfnakrej __P((fsm *, int, int, u_char *, int));
-static void fsm_rtermreq __P((fsm *, int));
+static void fsm_rtermreq __P((fsm *, int, u_char *, int));
static void fsm_rtermack __P((fsm *));
static void fsm_rcoderej __P((fsm *, u_char *, int));
static void fsm_sconfreq __P((fsm *, int));
break;
default:
- FSMDEBUG((LOG_INFO, "%s: Up event in state %d!",
- PROTO_NAME(f), f->state));
+ FSMDEBUG(("%s: Up event in state %d!", PROTO_NAME(f), f->state));
}
}
case CLOSING:
f->state = INITIAL;
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
break;
case STOPPING:
case ACKRCVD:
case ACKSENT:
f->state = STARTING;
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
break;
case OPENED:
break;
default:
- FSMDEBUG((LOG_INFO, "%s: Down event in state %d!",
- PROTO_NAME(f), f->state));
+ FSMDEBUG(("%s: Down event in state %d!", PROTO_NAME(f), f->state));
}
}
}
}
+/*
+ * terminate_layer - Start process of shutting down the FSM
+ *
+ * Cancel any timeout running, notify upper layers we're done, and
+ * send a terminate-request message as configured.
+ */
+static void
+terminate_layer(f, nextstate)
+ fsm *f;
+ int nextstate;
+{
+ 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 and send Terminate-Request */
+ f->retransmits = f->maxtermtransmits;
+ fsm_sdata(f, TERMREQ, f->reqid = ++f->id,
+ (u_char *) f->term_reason, f->term_reason_len);
+
+ if (f->retransmits == 0) {
+ /*
+ * User asked for no terminate requests at all; just close it.
+ * We've already fired off one Terminate-Request just to be nice
+ * to the peer, but we're not going to wait for a reply.
+ */
+ f->state = nextstate == CLOSING ? CLOSED : STOPPED;
+ if( f->callbacks->finished )
+ (*f->callbacks->finished)(f);
+ return;
+ }
+
+ TIMEOUT(fsm_timeout, f, f->timeouttime);
+ --f->retransmits;
+
+ f->state = nextstate;
+}
/*
* fsm_close - Start closing connection.
case ACKRCVD:
case ACKSENT:
case OPENED:
- if( f->state != OPENED )
- UNTIMEOUT(fsm_timeout, (caddr_t) 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, (caddr_t) f, f->timeouttime);
- --f->retransmits;
-
- f->state = CLOSING;
+ terminate_layer(f, CLOSING);
break;
}
}
*/
static void
fsm_timeout(arg)
- caddr_t arg;
+ void *arg;
{
fsm *f = (fsm *) arg;
/* Send Terminate-Request */
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);
+ TIMEOUT(fsm_timeout, f, f->timeouttime);
--f->retransmits;
}
break;
case ACKRCVD:
case ACKSENT:
if (f->retransmits <= 0) {
- syslog(LOG_WARNING, "%s: timeout sending Config-Requests",
- PROTO_NAME(f));
+ warn("%s: timeout sending Config-Requests\n", PROTO_NAME(f));
f->state = STOPPED;
if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
(*f->callbacks->finished)(f);
break;
default:
- FSMDEBUG((LOG_INFO, "%s: Timeout event in state %d!",
- PROTO_NAME(f), f->state));
+ FSMDEBUG(("%s: Timeout event in state %d!", PROTO_NAME(f), f->state));
}
}
u_char *inpacket;
int l;
{
- u_char *inp, *outp;
+ u_char *inp;
u_char code, id;
int len;
*/
inp = inpacket;
if (l < HEADERLEN) {
- FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.",
- f->protocol));
+ FSMDEBUG(("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));
+ FSMDEBUG(("fsm_input(%x): Rcvd illegal length.", f->protocol));
return;
}
if (len > l) {
- FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.",
- f->protocol));
+ FSMDEBUG(("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.",
+ FSMDEBUG(("fsm_input(%x): Rcvd packet in state %d.",
f->protocol, f->state));
return;
}
break;
case TERMREQ:
- fsm_rtermreq(f, id);
+ fsm_rtermreq(f, id, inp, len);
break;
case TERMACK:
u_char *inp;
int len;
{
- u_char *outp;
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 */
if( f->callbacks->down )
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
+ f->state = REQSENT;
break;
case STOPPED:
if (code == CONFACK) {
if (f->state == ACKRCVD) {
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = OPENED;
if (f->callbacks->up)
(*f->callbacks->up)(f); /* Inform upper layers */
f->nakloops = 0;
} else {
- /* we sent CONFACK or CONFREJ */
+ /* we sent CONFNAK or CONFREJ */
if (f->state != ACKRCVD)
f->state = REQSENT;
if( code == CONFNAK )
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 */
- FSMDEBUG((LOG_INFO, "%s: received bad Ack (length %d)",
- PROTO_NAME(f), len));
+ error("Received bad configure-ack: %P", inp, len);
return;
}
f->seen_ack = 1;
+ f->rnakloops = 0;
switch (f->state) {
case CLOSED:
case ACKRCVD:
/* Huh? an extra valid Ack? oh well... */
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = REQSENT;
break;
case ACKSENT:
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
f->state = OPENED;
f->retransmits = f->maxconfreqtransmits;
if (f->callbacks->up)
u_char *inp;
int len;
{
- int (*proc)();
int ret;
-
- FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d.",
- PROTO_NAME(f), id));
+ int treat_as_reject;
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)",
- PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len));
- return;
+
+ if (code == CONFNAK) {
+ ++f->rnakloops;
+ treat_as_reject = (f->rnakloops >= f->maxnakloops);
+ if (f->callbacks->nakci == NULL
+ || !(ret = f->callbacks->nakci(f, inp, len, treat_as_reject))) {
+ error("Received bad configure-nak: %P", inp, len);
+ return;
+ }
+ } else {
+ f->rnakloops = 0;
+ if (f->callbacks->rejci == NULL
+ || !(ret = f->callbacks->rejci(f, inp, len))) {
+ error("Received bad configure-rej: %P", inp, len);
+ return;
+ }
}
+
f->seen_ack = 1;
switch (f->state) {
case REQSENT:
case ACKSENT:
/* They didn't agree to what we wanted - try another request */
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
if (ret < 0)
f->state = STOPPED; /* kludge for stopping CCP */
else
case ACKRCVD:
/* Got a Nak/reject when we had already had an Ack?? oh well... */
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
fsm_sconfreq(f, 0);
f->state = REQSENT;
break;
* fsm_rtermreq - Receive Terminate-Req.
*/
static void
-fsm_rtermreq(f, id)
+fsm_rtermreq(f, id, p, len)
fsm *f;
int id;
+ u_char *p;
+ int len;
{
- FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d.",
- PROTO_NAME(f), id));
-
switch (f->state) {
case ACKRCVD:
case ACKSENT:
break;
case OPENED:
- syslog(LOG_INFO, "%s terminated at peer's request", PROTO_NAME(f));
- if (f->callbacks->down)
- (*f->callbacks->down)(f); /* Inform upper layers */
+ if (len > 0) {
+ info("%s terminated by peer (%0.*v)", PROTO_NAME(f), len, p);
+ } else
+ info("%s terminated by peer", PROTO_NAME(f));
f->retransmits = 0;
f->state = STOPPING;
- TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
+ if (f->callbacks->down)
+ (*f->callbacks->down)(f); /* Inform upper layers */
+ TIMEOUT(fsm_timeout, f, f->timeouttime);
break;
}
fsm_rtermack(f)
fsm *f;
{
- FSMDEBUG((LOG_INFO, "fsm_rtermack(%s).", PROTO_NAME(f)));
-
switch (f->state) {
case CLOSING:
- UNTIMEOUT(fsm_timeout, (caddr_t) f);
+ UNTIMEOUT(fsm_timeout, f);
f->state = CLOSED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
break;
case STOPPING:
- UNTIMEOUT(fsm_timeout, (caddr_t) f);
+ UNTIMEOUT(fsm_timeout, f);
f->state = STOPPED;
if( f->callbacks->finished )
(*f->callbacks->finished)(f);
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0);
+ f->state = REQSENT;
break;
}
}
{
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!"));
+ FSMDEBUG(("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);
+ warn("%s: Rcvd Code-Reject for code %d, id %d", PROTO_NAME(f), code, id);
if( f->state == ACKRCVD )
f->state = REQSENT;
{
switch( f->state ){
case CLOSING:
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
/* fall through */
case CLOSED:
f->state = CLOSED;
case REQSENT:
case ACKRCVD:
case ACKSENT:
- UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
+ UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
/* fall through */
case STOPPED:
f->state = STOPPED;
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;
+ terminate_layer(f, STOPPING);
break;
default:
- FSMDEBUG((LOG_INFO, "%s: Protocol-reject event in state %d!",
+ FSMDEBUG(("%s: Protocol-reject event in state %d!",
PROTO_NAME(f), f->state));
}
}
int retransmit;
{
u_char *outp;
- int outlen, cilen;
+ 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;
+ f->rnakloops = 0;
}
if( !retransmit ){
/* 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));
+ TIMEOUT(fsm_timeout, f, f->timeouttime);
}
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));
}
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