/*
* 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.
*/
-#define RCSID "$Id: fsm.c,v 1.18 2002/06/24 12:57:15 dfs Exp $"
+#define RCSID "$Id: fsm.c,v 1.23 2004/11/13 02:28:15 paulus Exp $"
/*
* TODO:
}
}
+/*
+ * 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, 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;
}
}
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 )
return;
}
f->seen_ack = 1;
+ f->rnakloops = 0;
switch (f->state) {
case CLOSED:
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) {
if (f->callbacks->down)
(*f->callbacks->down)(f); /* Inform upper layers */
fsm_sconfreq(f, 0);
+ f->state = REQSENT;
break;
}
}
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:
if( f->callbacks->resetci )
(*f->callbacks->resetci)(f);
f->nakloops = 0;
+ f->rnakloops = 0;
}
if( !retransmit ){
projects / ppp.git / blobdiff