added support for lwip

2025-07-08 08:01:04 +03:00 · 2015-02-15 16:35:01 -06:00
parent 86eb8f94ef
commit 0c07499e54
106 changed files with 41425 additions and 0 deletions
--- a/lwip/netif/ppp/fsm.c
+++ b/lwip/netif/ppp/fsm.c
@ -0,0 +1,838 @@
+/*****************************************************************************
+* fsm.c - Network Control Protocol Finite State Machine program file.
+*
+* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
+* portions Copyright (c) 1997 by Global Election Systems Inc.
+*
+* The authors hereby grant permission to use, copy, modify, distribute,
+* and license this software and its documentation for any purpose, provided
+* that existing copyright notices are retained in all copies and that this
+* notice and the following disclaimer are included verbatim in any 
+* distributions. No written agreement, license, or royalty fee is required
+* for any of the authorized uses.
+*
+* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
+* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+******************************************************************************
+* REVISION HISTORY
+*
+* 03-01-01 Marc Boucher <marc@mbsi.ca>
+*   Ported to lwIP.
+* 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
+*	Original based on BSD fsm.c.
+*****************************************************************************/
+/*
+ * fsm.c - {Link, IP} Control Protocol Finite State Machine.
+ *
+ * Copyright (c) 1989 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.
+ */
+
+
+/*
+ * TODO:
+ * Randomize fsm id on link/init.
+ * Deal with variable outgoing MTU.
+ */
+
+#include "ppp.h"
+#if PPP_SUPPORT > 0
+#include "fsm.h"
+#include "pppdebug.h"
+
+
+/*************************/
+/*** LOCAL DEFINITIONS ***/
+/*************************/
+
+
+/************************/
+/*** LOCAL DATA TYPES ***/
+/************************/
+
+
+/***********************************/
+/*** LOCAL FUNCTION DECLARATIONS ***/
+/***********************************/
+static void fsm_timeout (void *);
+static void fsm_rconfreq (fsm *, u_char, 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)
+
+
+/******************************/
+/*** PUBLIC DATA STRUCTURES ***/
+/******************************/
+
+
+/*****************************/
+/*** LOCAL DATA STRUCTURES ***/
+/*****************************/
+int peer_mru[NUM_PPP];
+
+
+/***********************************/
+/*** PUBLIC FUNCTION DEFINITIONS ***/
+/***********************************/
+
+/*
+ * fsm_init - Initialize fsm.
+ *
+ * Initialize fsm state.
+ */
+void fsm_init(fsm *f)
+{
+	f->state = INITIAL;
+	f->flags = 0;
+	f->id = 0;				/* XXX Start with random id? */
+	f->timeouttime = FSM_DEFTIMEOUT;
+	f->maxconfreqtransmits = FSM_DEFMAXCONFREQS;
+	f->maxtermtransmits = FSM_DEFMAXTERMREQS;
+	f->maxnakloops = FSM_DEFMAXNAKLOOPS;
+	f->term_reason_len = 0;
+}
+
+
+/*
+ * fsm_lowerup - The lower layer is up.
+ */
+void fsm_lowerup(fsm *f)
+{
+	int oldState = f->state;
+
+	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!\n",
+				PROTO_NAME(f), f->state));
+	}
+	
+	FSMDEBUG((LOG_INFO, "%s: lowerup state %d -> %d\n",
+			PROTO_NAME(f), oldState, f->state));
+}
+
+
+/*
+ * fsm_lowerdown - The lower layer is down.
+ *
+ * Cancel all timeouts and inform upper layers.
+ */
+void fsm_lowerdown(fsm *f)
+{
+	int oldState = f->state;
+	
+	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!\n",
+				PROTO_NAME(f), f->state));
+	}
+	
+	FSMDEBUG((LOG_INFO, "%s: lowerdown state %d -> %d\n",
+			PROTO_NAME(f), oldState, f->state));
+}
+
+
+/*
+ * fsm_open - Link is allowed to come up.
+ */
+void fsm_open(fsm *f)
+{
+	int oldState = f->state;
+	
+	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;
+	}
+	
+	FSMDEBUG((LOG_INFO, "%s: open state %d -> %d\n",
+			PROTO_NAME(f), oldState, f->state));
+}
+
+
+/*
+ * fsm_close - Start closing connection.
+ *
+ * Cancel timeouts and either initiate close or possibly go directly to
+ * the CLOSED state.
+ */
+void fsm_close(fsm *f, char *reason)
+{
+	int oldState = f->state;
+	
+	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;
+	}
+	
+	FSMDEBUG((LOG_INFO, "%s: close reason=%s state %d -> %d\n",
+			PROTO_NAME(f), reason, oldState, f->state));
+}
+
+
+/*
+ * fsm_sdata - Send some data.
+ *
+ * Used for all packets sent to our peer by this module.
+ */
+void fsm_sdata(
+	fsm *f,
+	u_char code, 
+	u_char id,
+	u_char *data,
+	int datalen
+)
+{
+	u_char *outp;
+	int outlen;
+	
+	/* Adjust length to be smaller than MTU */
+	outp = outpacket_buf[f->unit];
+	if (datalen > peer_mru[f->unit] - (int)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);
+	pppWrite(f->unit, outpacket_buf[f->unit], outlen + PPP_HDRLEN);
+	FSMDEBUG((LOG_INFO, "fsm_sdata(%s): Sent code %d,%d,%d.\n",
+				PROTO_NAME(f), code, id, outlen));
+}
+
+
+/*
+ * fsm_input - Input packet.
+ */
+void fsm_input(fsm *f, u_char *inpacket, int l)
+{
+	u_char *inp = inpacket;
+	u_char code, id;
+	int len;
+	
+	/*
+	* Parse header (code, id and length).
+	* If packet too short, drop it.
+	*/
+	if (l < HEADERLEN) {
+		FSMDEBUG((LOG_WARNING, "fsm_input(%x): Rcvd short header.\n",
+					f->protocol));
+		return;
+	}
+	GETCHAR(code, inp);
+	GETCHAR(id, inp);
+	GETSHORT(len, inp);
+	if (len < HEADERLEN) {
+		FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd illegal length.\n",
+				f->protocol));
+		return;
+	}
+	if (len > l) {
+		FSMDEBUG((LOG_INFO, "fsm_input(%x): Rcvd short packet.\n",
+				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.\n",
+				f->protocol, f->state));
+		return;
+	}
+	FSMDEBUG((LOG_INFO, "fsm_input(%s):%d,%d,%d\n", PROTO_NAME(f), code, id, l));
+	/*
+	 * 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_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, 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!\n",
+					PROTO_NAME(f), f->state));
+	}
+}
+
+
+
+
+
+/**********************************/
+/*** LOCAL FUNCTION DEFINITIONS ***/
+/**********************************/
+
+/*
+ * fsm_timeout - Timeout expired.
+ */
+static void fsm_timeout(void *arg)
+{
+    fsm *f = (fsm *) arg;
+
+    switch (f->state) {
+    case CLOSING:
+    case STOPPING:
+		if( f->retransmits <= 0 ){
+		    FSMDEBUG((LOG_WARNING, "%s: timeout sending Terminate-Request state=%d\n",
+					   PROTO_NAME(f), f->state));
+		    /*
+		     * 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 {
+		    FSMDEBUG((LOG_WARNING, "%s: timeout resending Terminate-Requests state=%d\n",
+					   PROTO_NAME(f), f->state));
+		    /* 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) {
+		    FSMDEBUG((LOG_WARNING, "%s: timeout sending Config-Requests state=%d\n",
+			   PROTO_NAME(f), f->state));
+		    f->state = STOPPED;
+		    if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
+				(*f->callbacks->finished)(f);
+	
+		} else {
+		    FSMDEBUG((LOG_WARNING, "%s: timeout resending Config-Request state=%d\n",
+			   PROTO_NAME(f), f->state));
+		    /* 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!\n",
+				  PROTO_NAME(f), f->state));
+	    }
+}
+
+
+/*
+ * fsm_rconfreq - Receive Configure-Request.
+ */
+static void fsm_rconfreq(fsm *f, u_char id, u_char *inp, int len)
+{
+	int code, reject_if_disagree;
+	
+	FSMDEBUG((LOG_INFO, "fsm_rconfreq(%s): Rcvd id %d state=%d\n", 
+				PROTO_NAME(f), id, f->state));
+	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, (u_char)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(fsm *f, int id, u_char *inp, int len)
+{
+	FSMDEBUG((LOG_INFO, "fsm_rconfack(%s): Rcvd id %d state=%d\n",
+				PROTO_NAME(f), id, f->state));
+	
+	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)\n",
+					PROTO_NAME(f), len));
+		return;
+	}
+	f->seen_ack = 1;
+	
+	switch (f->state) {
+	case CLOSED:
+	case STOPPED:
+		fsm_sdata(f, TERMACK, (u_char)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(fsm *f, int code, int id, u_char *inp, int len)
+{
+	int (*proc) (fsm *, u_char *, int);
+	int ret;
+	
+	FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d state=%d\n",
+				PROTO_NAME(f), id, f->state));
+	
+	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)\n",
+					PROTO_NAME(f), (code==CONFNAK? "Nak": "reject"), len));
+		return;
+	}
+	f->seen_ack = 1;
+	
+	switch (f->state) {
+	case CLOSED:
+	case STOPPED:
+		fsm_sdata(f, TERMACK, (u_char)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(fsm *f, int id, u_char *p, int len)
+{
+	FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d state=%d\n",
+				PROTO_NAME(f), id, f->state));
+	
+	switch (f->state) {
+	case ACKRCVD:
+	case ACKSENT:
+		f->state = REQSENT;		/* Start over but keep trying */
+		break;
+	
+	case OPENED:
+		if (len > 0) {
+			FSMDEBUG((LOG_INFO, "%s terminated by peer (%x)\n", PROTO_NAME(f), p));
+		} else {
+			FSMDEBUG((LOG_INFO, "%s terminated by peer\n", 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, (u_char)id, NULL, 0);
+}
+
+
+/*
+ * fsm_rtermack - Receive Terminate-Ack.
+ */
+static void fsm_rtermack(fsm *f)
+{
+	FSMDEBUG((LOG_INFO, "fsm_rtermack(%s): state=%d\n", 
+				PROTO_NAME(f), f->state));
+	
+	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(fsm *f, u_char *inp, int len)
+{
+	u_char code, id;
+	
+	FSMDEBUG((LOG_INFO, "fsm_rcoderej(%s): state=%d\n", 
+				PROTO_NAME(f), f->state));
+	
+	if (len < HEADERLEN) {
+		FSMDEBUG((LOG_INFO, "fsm_rcoderej: Rcvd short Code-Reject packet!\n"));
+		return;
+	}
+	GETCHAR(code, inp);
+	GETCHAR(id, inp);
+	FSMDEBUG((LOG_WARNING, "%s: Rcvd Code-Reject for code %d, id %d\n",
+				PROTO_NAME(f), code, id));
+	
+	if( f->state == ACKRCVD )
+		f->state = REQSENT;
+}
+
+
+/*
+ * 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[f->unit] + PPP_HDRLEN + HEADERLEN;
+	if( f->callbacks->cilen && f->callbacks->addci ){
+		cilen = (*f->callbacks->cilen)(f);
+		if( cilen > peer_mru[f->unit] - (int)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\n",
+				PROTO_NAME(f), f->reqid));
+}
+
+#endif /* PPP_SUPPORT */