890 lines
23 KiB
C
890 lines
23 KiB
C
/*****************************************************************************
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* fsm.c - Network Control Protocol Finite State Machine program file.
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*
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* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
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* portions Copyright (c) 1997 by Global Election Systems Inc.
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice and the following disclaimer are included verbatim in any
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* distributions. No written agreement, license, or royalty fee is required
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* for any of the authorized uses.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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* REVISION HISTORY
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*
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* 03-01-01 Marc Boucher <marc@mbsi.ca>
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* Ported to lwIP.
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* 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
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* Original based on BSD fsm.c.
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*****************************************************************************/
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/*
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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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/*
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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 "lwip/opt.h"
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#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
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#include "ppp.h"
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#include "pppdebug.h"
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#include "fsm.h"
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#include <string.h>
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#if PPP_DEBUG
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static const char *ppperr_strerr[] = {
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"LS_INITIAL", /* LS_INITIAL 0 */
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"LS_STARTING", /* LS_STARTING 1 */
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"LS_CLOSED", /* LS_CLOSED 2 */
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"LS_STOPPED", /* LS_STOPPED 3 */
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"LS_CLOSING", /* LS_CLOSING 4 */
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"LS_STOPPING", /* LS_STOPPING 5 */
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"LS_REQSENT", /* LS_REQSENT 6 */
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"LS_ACKRCVD", /* LS_ACKRCVD 7 */
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"LS_ACKSENT", /* LS_ACKSENT 8 */
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"LS_OPENED" /* LS_OPENED 9 */
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};
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#endif /* PPP_DEBUG */
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static void fsm_timeout (void *);
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static void fsm_rconfreq (fsm *, u_char, u_char *, int);
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static void fsm_rconfack (fsm *, int, u_char *, int);
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static void fsm_rconfnakrej (fsm *, int, int, u_char *, int);
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static void fsm_rtermreq (fsm *, int, u_char *, int);
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static void fsm_rtermack (fsm *);
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static void fsm_rcoderej (fsm *, u_char *, int);
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static void fsm_sconfreq (fsm *, int);
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#define PROTO_NAME(f) ((f)->callbacks->proto_name)
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int peer_mru[NUM_PPP];
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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
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fsm_init(fsm *f)
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{
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f->state = LS_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 = FSM_DEFTIMEOUT;
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f->maxconfreqtransmits = FSM_DEFMAXCONFREQS;
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f->maxtermtransmits = FSM_DEFMAXTERMREQS;
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f->maxnakloops = FSM_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
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fsm_lowerup(fsm *f)
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{
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int oldState = f->state;
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LWIP_UNUSED_ARG(oldState);
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switch( f->state ) {
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case LS_INITIAL:
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f->state = LS_CLOSED;
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break;
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case LS_STARTING:
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if( f->flags & OPT_SILENT ) {
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f->state = LS_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 = LS_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 (%s)!\n",
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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}
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FSMDEBUG(LOG_INFO, ("%s: lowerup state %d (%s) -> %d (%s)\n",
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PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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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
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fsm_lowerdown(fsm *f)
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{
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int oldState = f->state;
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LWIP_UNUSED_ARG(oldState);
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switch( f->state ) {
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case LS_CLOSED:
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f->state = LS_INITIAL;
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break;
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case LS_STOPPED:
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f->state = LS_STARTING;
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if( f->callbacks->starting ) {
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(*f->callbacks->starting)(f);
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}
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break;
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case LS_CLOSING:
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f->state = LS_INITIAL;
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UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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break;
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case LS_STOPPING:
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case LS_REQSENT:
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case LS_ACKRCVD:
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case LS_ACKSENT:
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f->state = LS_STARTING;
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UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
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break;
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case LS_OPENED:
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if( f->callbacks->down ) {
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(*f->callbacks->down)(f);
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}
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f->state = LS_STARTING;
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break;
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default:
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FSMDEBUG(LOG_INFO, ("%s: Down event in state %d (%s)!\n",
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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}
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FSMDEBUG(LOG_INFO, ("%s: lowerdown state %d (%s) -> %d (%s)\n",
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PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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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
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fsm_open(fsm *f)
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{
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int oldState = f->state;
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LWIP_UNUSED_ARG(oldState);
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switch( f->state ) {
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case LS_INITIAL:
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f->state = LS_STARTING;
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if( f->callbacks->starting ) {
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(*f->callbacks->starting)(f);
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}
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break;
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case LS_CLOSED:
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if( f->flags & OPT_SILENT ) {
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f->state = LS_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 = LS_REQSENT;
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}
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break;
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case LS_CLOSING:
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f->state = LS_STOPPING;
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/* fall through */
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case LS_STOPPED:
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case LS_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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FSMDEBUG(LOG_INFO, ("%s: open state %d (%s) -> %d (%s)\n",
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PROTO_NAME(f), oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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}
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#if 0 /* backport pppd 2.4.4b1; */
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/*
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* terminate_layer - Start process of shutting down the FSM
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*
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* Cancel any timeout running, notify upper layers we're done, and
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* send a terminate-request message as configured.
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*/
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static void
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terminate_layer(fsm *f, int nextstate)
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{
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/* @todo */
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}
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#endif
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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 LS_CLOSED state.
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*/
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void
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fsm_close(fsm *f, char *reason)
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{
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int oldState = f->state;
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LWIP_UNUSED_ARG(oldState);
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f->term_reason = reason;
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f->term_reason_len = (reason == NULL ? 0 : (int)strlen(reason));
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switch( f->state ) {
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case LS_STARTING:
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f->state = LS_INITIAL;
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break;
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case LS_STOPPED:
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f->state = LS_CLOSED;
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break;
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case LS_STOPPING:
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f->state = LS_CLOSING;
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break;
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case LS_REQSENT:
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case LS_ACKRCVD:
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case LS_ACKSENT:
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case LS_OPENED:
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if( f->state != LS_OPENED ) {
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UNTIMEOUT(fsm_timeout, 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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}
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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, f, f->timeouttime);
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--f->retransmits;
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f->state = LS_CLOSING;
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break;
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}
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FSMDEBUG(LOG_INFO, ("%s: close reason=%s state %d (%s) -> %d (%s)\n",
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PROTO_NAME(f), reason, oldState, ppperr_strerr[oldState], f->state, ppperr_strerr[f->state]));
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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
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fsm_timeout(void *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 LS_CLOSING:
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case LS_STOPPING:
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if( f->retransmits <= 0 ) {
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FSMDEBUG(LOG_WARNING, ("%s: timeout sending Terminate-Request state=%d (%s)\n",
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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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 == LS_CLOSING)? LS_CLOSED: LS_STOPPED;
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if( f->callbacks->finished ) {
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(*f->callbacks->finished)(f);
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}
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} else {
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FSMDEBUG(LOG_WARNING, ("%s: timeout resending Terminate-Requests state=%d (%s)\n",
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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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, f, f->timeouttime);
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--f->retransmits;
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}
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break;
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case LS_REQSENT:
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case LS_ACKRCVD:
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case LS_ACKSENT:
|
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if (f->retransmits <= 0) {
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FSMDEBUG(LOG_WARNING, ("%s: timeout sending Config-Requests state=%d (%s)\n",
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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f->state = LS_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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}
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} else {
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FSMDEBUG(LOG_WARNING, ("%s: timeout resending Config-Request state=%d (%s)\n",
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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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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}
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fsm_sconfreq(f, 1); /* Re-send Configure-Request */
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if( f->state == LS_ACKRCVD ) {
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f->state = LS_REQSENT;
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}
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}
|
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break;
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default:
|
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FSMDEBUG(LOG_INFO, ("%s: UNHANDLED timeout event in state %d (%s)!\n",
|
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PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
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}
|
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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
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fsm_input(fsm *f, u_char *inpacket, int l)
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|
{
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u_char *inp = inpacket;
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u_char code, id;
|
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int len;
|
|
|
|
/*
|
|
* Parse header (code, id and length).
|
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* If packet too short, drop it.
|
|
*/
|
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if (l < HEADERLEN) {
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FSMDEBUG(LOG_WARNING, ("fsm_input(%x): Rcvd short header.\n",
|
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f->protocol));
|
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return;
|
|
}
|
|
GETCHAR(code, inp);
|
|
GETCHAR(id, inp);
|
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GETSHORT(len, inp);
|
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if (len < HEADERLEN) {
|
|
FSMDEBUG(LOG_INFO, ("fsm_input(%x): Rcvd illegal length.\n",
|
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f->protocol));
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return;
|
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}
|
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if (len > l) {
|
|
FSMDEBUG(LOG_INFO, ("fsm_input(%x): Rcvd short packet.\n",
|
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f->protocol));
|
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return;
|
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}
|
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len -= HEADERLEN; /* subtract header length */
|
|
|
|
if( f->state == LS_INITIAL || f->state == LS_STARTING ) {
|
|
FSMDEBUG(LOG_INFO, ("fsm_input(%x): Rcvd packet in state %d (%s).\n",
|
|
f->protocol, f->state, ppperr_strerr[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:
|
|
FSMDEBUG(LOG_INFO, ("fsm_input(%s): default: \n", PROTO_NAME(f)));
|
|
if( !f->callbacks->extcode ||
|
|
!(*f->callbacks->extcode)(f, code, id, inp, len) ) {
|
|
fsm_sdata(f, CODEREJ, ++f->id, inpacket, len + HEADERLEN);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 (%s)\n",
|
|
PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
|
|
switch( f->state ) {
|
|
case LS_CLOSED:
|
|
/* Go away, we're closed */
|
|
fsm_sdata(f, TERMACK, id, NULL, 0);
|
|
return;
|
|
case LS_CLOSING:
|
|
case LS_STOPPING:
|
|
return;
|
|
|
|
case LS_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 LS_STOPPED:
|
|
/* Negotiation started by our peer */
|
|
fsm_sconfreq(f, 0); /* Send initial Configure-Request */
|
|
f->state = LS_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 == LS_ACKRCVD) {
|
|
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
|
f->state = LS_OPENED;
|
|
if (f->callbacks->up) {
|
|
(*f->callbacks->up)(f); /* Inform upper layers */
|
|
}
|
|
} else {
|
|
f->state = LS_ACKSENT;
|
|
}
|
|
f->nakloops = 0;
|
|
} else {
|
|
/* we sent CONFACK or CONFREJ */
|
|
if (f->state != LS_ACKRCVD) {
|
|
f->state = LS_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 (%s)\n",
|
|
PROTO_NAME(f), id, f->state, ppperr_strerr[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 LS_CLOSED:
|
|
case LS_STOPPED:
|
|
fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
|
|
break;
|
|
|
|
case LS_REQSENT:
|
|
f->state = LS_ACKRCVD;
|
|
f->retransmits = f->maxconfreqtransmits;
|
|
break;
|
|
|
|
case LS_ACKRCVD:
|
|
/* Huh? an extra valid Ack? oh well... */
|
|
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
|
fsm_sconfreq(f, 0);
|
|
f->state = LS_REQSENT;
|
|
break;
|
|
|
|
case LS_ACKSENT:
|
|
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
|
f->state = LS_OPENED;
|
|
f->retransmits = f->maxconfreqtransmits;
|
|
if (f->callbacks->up) {
|
|
(*f->callbacks->up)(f); /* Inform upper layers */
|
|
}
|
|
break;
|
|
|
|
case LS_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 = LS_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 (%s)\n",
|
|
PROTO_NAME(f), id, f->state, ppperr_strerr[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 LS_CLOSED:
|
|
case LS_STOPPED:
|
|
fsm_sdata(f, TERMACK, (u_char)id, NULL, 0);
|
|
break;
|
|
|
|
case LS_REQSENT:
|
|
case LS_ACKSENT:
|
|
/* They didn't agree to what we wanted - try another request */
|
|
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
|
if (ret < 0) {
|
|
f->state = LS_STOPPED; /* kludge for stopping CCP */
|
|
} else {
|
|
fsm_sconfreq(f, 0); /* Send Configure-Request */
|
|
}
|
|
break;
|
|
|
|
case LS_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 = LS_REQSENT;
|
|
break;
|
|
|
|
case LS_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 = LS_REQSENT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_rtermreq - Receive Terminate-Req.
|
|
*/
|
|
static void
|
|
fsm_rtermreq(fsm *f, int id, u_char *p, int len)
|
|
{
|
|
LWIP_UNUSED_ARG(p);
|
|
|
|
FSMDEBUG(LOG_INFO, ("fsm_rtermreq(%s): Rcvd id %d state=%d (%s)\n",
|
|
PROTO_NAME(f), id, f->state, ppperr_strerr[f->state]));
|
|
|
|
switch (f->state) {
|
|
case LS_ACKRCVD:
|
|
case LS_ACKSENT:
|
|
f->state = LS_REQSENT; /* Start over but keep trying */
|
|
break;
|
|
|
|
case LS_OPENED:
|
|
if (len > 0) {
|
|
FSMDEBUG(LOG_INFO, ("%s terminated by peer (%p)\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 = LS_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 (%s)\n",
|
|
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
|
|
|
switch (f->state) {
|
|
case LS_CLOSING:
|
|
UNTIMEOUT(fsm_timeout, f);
|
|
f->state = LS_CLOSED;
|
|
if( f->callbacks->finished ) {
|
|
(*f->callbacks->finished)(f);
|
|
}
|
|
break;
|
|
|
|
case LS_STOPPING:
|
|
UNTIMEOUT(fsm_timeout, f);
|
|
f->state = LS_STOPPED;
|
|
if( f->callbacks->finished ) {
|
|
(*f->callbacks->finished)(f);
|
|
}
|
|
break;
|
|
|
|
case LS_ACKRCVD:
|
|
f->state = LS_REQSENT;
|
|
break;
|
|
|
|
case LS_OPENED:
|
|
if (f->callbacks->down) {
|
|
(*f->callbacks->down)(f); /* Inform upper layers */
|
|
}
|
|
fsm_sconfreq(f, 0);
|
|
break;
|
|
default:
|
|
FSMDEBUG(LOG_INFO, ("fsm_rtermack(%s): UNHANDLED state=%d (%s)!!!\n",
|
|
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 (%s)\n",
|
|
PROTO_NAME(f), f->state, ppperr_strerr[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 == LS_ACKRCVD ) {
|
|
f->state = LS_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 LS_CLOSING:
|
|
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
|
/* fall through */
|
|
case LS_CLOSED:
|
|
f->state = LS_CLOSED;
|
|
if( f->callbacks->finished ) {
|
|
(*f->callbacks->finished)(f);
|
|
}
|
|
break;
|
|
|
|
case LS_STOPPING:
|
|
case LS_REQSENT:
|
|
case LS_ACKRCVD:
|
|
case LS_ACKSENT:
|
|
UNTIMEOUT(fsm_timeout, f); /* Cancel timeout */
|
|
/* fall through */
|
|
case LS_STOPPED:
|
|
f->state = LS_STOPPED;
|
|
if( f->callbacks->finished ) {
|
|
(*f->callbacks->finished)(f);
|
|
}
|
|
break;
|
|
|
|
case LS_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 = LS_STOPPING;
|
|
break;
|
|
|
|
default:
|
|
FSMDEBUG(LOG_INFO, ("%s: Protocol-reject event in state %d (%s)!\n",
|
|
PROTO_NAME(f), f->state, ppperr_strerr[f->state]));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_sconfreq - Send a Configure-Request.
|
|
*/
|
|
static void
|
|
fsm_sconfreq(fsm *f, int retransmit)
|
|
{
|
|
u_char *outp;
|
|
int cilen;
|
|
|
|
if( f->state != LS_REQSENT && f->state != LS_ACKRCVD && f->state != LS_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));
|
|
}
|
|
|
|
|
|
/*
|
|
* 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));
|
|
}
|
|
|
|
#endif /* PPP_SUPPORT */
|