/*
* 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 const char rcsid[] = "$Id: fsm.c,v 1.16 1999/08/12 04:25:20 paulus Exp $";
-#endif
-
/*
* TODO:
* Randomize fsm id on link/init.
#include "pppd.h"
#include "fsm.h"
-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, 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));
+
+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)
* Initialize fsm state.
*/
void
-fsm_init(f)
- fsm *f;
+fsm_init(fsm *f)
{
f->state = INITIAL;
f->flags = 0;
* fsm_lowerup - The lower layer is up.
*/
void
-fsm_lowerup(f)
- fsm *f;
+fsm_lowerup(fsm *f)
{
switch( f->state ){
case INITIAL:
* Cancel all timeouts and inform upper layers.
*/
void
-fsm_lowerdown(f)
- fsm *f;
+fsm_lowerdown(fsm *f)
{
switch( f->state ){
case CLOSED:
* fsm_open - Link is allowed to come up.
*/
void
-fsm_open(f)
- fsm *f;
+fsm_open(fsm *f)
{
switch( f->state ){
case INITIAL:
}
}
+/*
+ * 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(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.
* the CLOSED state.
*/
void
-fsm_close(f, reason)
- fsm *f;
- char *reason;
+fsm_close(fsm *f, char *reason)
{
f->term_reason = reason;
f->term_reason_len = (reason == NULL? 0: strlen(reason));
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;
+ terminate_layer(f, CLOSING);
break;
}
}
* fsm_timeout - Timeout expired.
*/
static void
-fsm_timeout(arg)
- void *arg;
+fsm_timeout(void *arg)
{
fsm *f = (fsm *) arg;
* fsm_input - Input packet.
*/
void
-fsm_input(f, inpacket, l)
- fsm *f;
- u_char *inpacket;
- int l;
+fsm_input(fsm *f, u_char *inpacket, int l)
{
u_char *inp;
u_char code, id;
* fsm_rconfreq - Receive Configure-Request.
*/
static void
-fsm_rconfreq(f, id, inp, len)
- fsm *f;
- u_char id;
- u_char *inp;
- int len;
+fsm_rconfreq(fsm *f, int id, u_char *inp, int len)
{
int code, reject_if_disagree;
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:
f->nakloops = 0;
} else {
- /* we sent CONFACK or CONFREJ */
+ /* we sent CONFNAK or CONFREJ */
if (f->state != ACKRCVD)
f->state = REQSENT;
if( code == CONFNAK )
* fsm_rconfack - Receive Configure-Ack.
*/
static void
-fsm_rconfack(f, id, inp, len)
- fsm *f;
- int id;
- u_char *inp;
- int len;
+fsm_rconfack(fsm *f, int id, u_char *inp, int len)
{
if (id != f->reqid || f->seen_ack) /* Expected id? */
return; /* Nope, toss... */
return;
}
f->seen_ack = 1;
+ f->rnakloops = 0;
switch (f->state) {
case CLOSED:
* 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;
+fsm_rconfnakrej(fsm *f, int code, int id, u_char *inp, int len)
{
- int (*proc) __P((fsm *, u_char *, int));
int ret;
+ 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 */
- error("Received bad configure-nak/rej: %P", inp, 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) {
* fsm_rtermreq - Receive Terminate-Req.
*/
static void
-fsm_rtermreq(f, id, p, len)
- fsm *f;
- int id;
- u_char *p;
- int len;
+fsm_rtermreq(fsm *f, int id, u_char *p, int len)
{
switch (f->state) {
case ACKRCVD:
info("%s terminated by peer (%0.*v)", PROTO_NAME(f), len, p);
} else
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;
+ if (f->callbacks->down)
+ (*f->callbacks->down)(f); /* Inform upper layers */
TIMEOUT(fsm_timeout, f, f->timeouttime);
break;
}
* fsm_rtermack - Receive Terminate-Ack.
*/
static void
-fsm_rtermack(f)
- fsm *f;
+fsm_rtermack(fsm *f)
{
switch (f->state) {
case CLOSING:
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0);
+ f->state = REQSENT;
break;
}
}
* fsm_rcoderej - Receive an Code-Reject.
*/
static void
-fsm_rcoderej(f, inp, len)
- fsm *f;
- u_char *inp;
- int len;
+fsm_rcoderej(fsm *f, u_char *inp, int len)
{
u_char code, id;
* Treat this as a catastrophic error (RXJ-).
*/
void
-fsm_protreject(f)
- fsm *f;
+fsm_protreject(fsm *f)
{
switch( f->state ){
case CLOSING:
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;
+ terminate_layer(f, STOPPING);
break;
default:
* fsm_sconfreq - Send a Configure-Request.
*/
static void
-fsm_sconfreq(f, retransmit)
- fsm *f;
- int retransmit;
+fsm_sconfreq(fsm *f, int retransmit)
{
u_char *outp;
int cilen;
if( f->callbacks->resetci )
(*f->callbacks->resetci)(f);
f->nakloops = 0;
+ f->rnakloops = 0;
}
if( !retransmit ){
* 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;
+fsm_sdata(fsm *f, int code, int id, u_char *data, int datalen)
{
u_char *outp;
int outlen;
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