mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-04 09:09:56 +00:00
774 lines
16 KiB
C
774 lines
16 KiB
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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char rcsid[] = "$Id: fsm.c,v 1.2 1994/09/25 02:31:57 wollman Exp $";
|
|
#endif
|
|
|
|
/*
|
|
* TODO:
|
|
* Randomize fsm id on link/init.
|
|
* Deal with variable outgoing MTU.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <syslog.h>
|
|
|
|
#include "ppp.h"
|
|
#include "pppd.h"
|
|
#include "fsm.h"
|
|
|
|
extern char *proto_name();
|
|
|
|
static void fsm_timeout __ARGS((caddr_t));
|
|
static void fsm_rconfreq __ARGS((fsm *, int, u_char *, int));
|
|
static void fsm_rconfack __ARGS((fsm *, int, u_char *, int));
|
|
static void fsm_rconfnakrej __ARGS((fsm *, int, int, u_char *, int));
|
|
static void fsm_rtermreq __ARGS((fsm *, int));
|
|
static void fsm_rtermack __ARGS((fsm *));
|
|
static void fsm_rcoderej __ARGS((fsm *, u_char *, int));
|
|
static void fsm_sconfreq __ARGS((fsm *, int));
|
|
|
|
#define PROTO_NAME(f) ((f)->callbacks->proto_name)
|
|
|
|
int peer_mru[NPPP];
|
|
|
|
|
|
/*
|
|
* fsm_init - Initialize fsm.
|
|
*
|
|
* Initialize fsm state.
|
|
*/
|
|
void
|
|
fsm_init(f)
|
|
fsm *f;
|
|
{
|
|
f->state = INITIAL;
|
|
f->flags = 0;
|
|
f->id = 0; /* XXX Start with random id? */
|
|
f->timeouttime = DEFTIMEOUT;
|
|
f->maxconfreqtransmits = DEFMAXCONFREQS;
|
|
f->maxtermtransmits = DEFMAXTERMREQS;
|
|
f->maxnakloops = DEFMAXNAKLOOPS;
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_lowerup - The lower layer is up.
|
|
*/
|
|
void
|
|
fsm_lowerup(f)
|
|
fsm *f;
|
|
{
|
|
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!",
|
|
PROTO_NAME(f), f->state));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_lowerdown - The lower layer is down.
|
|
*
|
|
* Cancel all timeouts and inform upper layers.
|
|
*/
|
|
void
|
|
fsm_lowerdown(f)
|
|
fsm *f;
|
|
{
|
|
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, (caddr_t) f); /* Cancel timeout */
|
|
break;
|
|
|
|
case STOPPING:
|
|
case REQSENT:
|
|
case ACKRCVD:
|
|
case ACKSENT:
|
|
f->state = STARTING;
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) 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!",
|
|
PROTO_NAME(f), f->state));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_open - Link is allowed to come up.
|
|
*/
|
|
void
|
|
fsm_open(f)
|
|
fsm *f;
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_close - Start closing connection.
|
|
*
|
|
* Cancel timeouts and either initiate close or possibly go directly to
|
|
* the CLOSED state.
|
|
*/
|
|
void
|
|
fsm_close(f)
|
|
fsm *f;
|
|
{
|
|
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, (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, NULL, 0);
|
|
TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
|
|
--f->retransmits;
|
|
|
|
f->state = CLOSING;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_timeout - Timeout expired.
|
|
*/
|
|
static void
|
|
fsm_timeout(arg)
|
|
caddr_t arg;
|
|
{
|
|
fsm *f = (fsm *) arg;
|
|
|
|
switch (f->state) {
|
|
case CLOSING:
|
|
case STOPPING:
|
|
if( f->retransmits <= 0 ){
|
|
/*
|
|
* 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 {
|
|
/* Send Terminate-Request */
|
|
fsm_sdata(f, TERMREQ, f->reqid = ++f->id, NULL, 0);
|
|
TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
|
|
--f->retransmits;
|
|
}
|
|
break;
|
|
|
|
case REQSENT:
|
|
case ACKRCVD:
|
|
case ACKSENT:
|
|
if (f->retransmits <= 0) {
|
|
syslog(LOG_WARNING, "%s: timeout sending Config-Requests",
|
|
PROTO_NAME(f));
|
|
f->state = STOPPED;
|
|
if( (f->flags & OPT_PASSIVE) == 0 && f->callbacks->finished )
|
|
(*f->callbacks->finished)(f);
|
|
|
|
} else {
|
|
/* 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!",
|
|
PROTO_NAME(f), f->state));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_input - Input packet.
|
|
*/
|
|
void
|
|
fsm_input(f, inpacket, l)
|
|
fsm *f;
|
|
u_char *inpacket;
|
|
int l;
|
|
{
|
|
u_char *inp, *outp;
|
|
u_char code, id;
|
|
int len;
|
|
|
|
/*
|
|
* Parse header (code, id and length).
|
|
* If packet too short, drop it.
|
|
*/
|
|
inp = inpacket;
|
|
if (l < HEADERLEN) {
|
|
FSMDEBUG((LOG_WARNING, "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));
|
|
return;
|
|
}
|
|
if (len > l) {
|
|
FSMDEBUG((LOG_INFO, "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.",
|
|
f->protocol, f->state));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
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_rconfreq - Receive Configure-Request.
|
|
*/
|
|
static void
|
|
fsm_rconfreq(f, id, inp, len)
|
|
fsm *f;
|
|
u_char id;
|
|
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 */
|
|
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, code, id, inp, len);
|
|
|
|
if (code == CONFACK) {
|
|
if (f->state == ACKRCVD) {
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) 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(f, id, inp, len)
|
|
fsm *f;
|
|
int id;
|
|
u_char *inp;
|
|
int len;
|
|
{
|
|
FSMDEBUG((LOG_INFO, "fsm_rconfack(%s): Rcvd id %d.",
|
|
PROTO_NAME(f), id));
|
|
|
|
if (id != f->reqid) /* 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));
|
|
return;
|
|
}
|
|
f->reqid = -1;
|
|
|
|
switch (f->state) {
|
|
case CLOSED:
|
|
case STOPPED:
|
|
fsm_sdata(f, TERMACK, id, NULL, 0);
|
|
break;
|
|
|
|
case REQSENT:
|
|
f->state = ACKRCVD;
|
|
f->retransmits = f->maxconfreqtransmits;
|
|
break;
|
|
|
|
case ACKRCVD:
|
|
/* Huh? an extra Ack? oh well... */
|
|
fsm_sconfreq(f, 0);
|
|
f->state = REQSENT;
|
|
break;
|
|
|
|
case ACKSENT:
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) 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(f, code, id, inp, len)
|
|
fsm *f;
|
|
int code, id;
|
|
u_char *inp;
|
|
int len;
|
|
{
|
|
int (*proc)();
|
|
|
|
FSMDEBUG((LOG_INFO, "fsm_rconfnakrej(%s): Rcvd id %d.",
|
|
PROTO_NAME(f), id));
|
|
|
|
if (id != f->reqid) /* Expected id? */
|
|
return; /* Nope, toss... */
|
|
proc = (code == CONFNAK)? f->callbacks->nakci: f->callbacks->rejci;
|
|
if( !proc || !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;
|
|
}
|
|
f->reqid = -1;
|
|
|
|
switch (f->state) {
|
|
case CLOSED:
|
|
case STOPPED:
|
|
fsm_sdata(f, TERMACK, id, NULL, 0);
|
|
break;
|
|
|
|
case REQSENT:
|
|
case ACKSENT:
|
|
/* They didn't agree to what we wanted - try another request */
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) f); /* Cancel timeout */
|
|
fsm_sconfreq(f, 0); /* Send Configure-Request */
|
|
break;
|
|
|
|
case ACKRCVD:
|
|
/* Got a Nak/reject when we had already had an Ack?? oh well... */
|
|
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(f, id)
|
|
fsm *f;
|
|
int id;
|
|
{
|
|
FSMDEBUG((LOG_INFO, "fsm_rtermreq(%s): Rcvd id %d.",
|
|
PROTO_NAME(f), id));
|
|
|
|
switch (f->state) {
|
|
case ACKRCVD:
|
|
case ACKSENT:
|
|
f->state = REQSENT; /* Start over but keep trying */
|
|
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 */
|
|
f->retransmits = 0;
|
|
f->state = STOPPING;
|
|
TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
|
|
break;
|
|
}
|
|
|
|
fsm_sdata(f, TERMACK, id, NULL, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_rtermack - Receive Terminate-Ack.
|
|
*/
|
|
static void
|
|
fsm_rtermack(f)
|
|
fsm *f;
|
|
{
|
|
FSMDEBUG((LOG_INFO, "fsm_rtermack(%s).", PROTO_NAME(f)));
|
|
|
|
switch (f->state) {
|
|
case CLOSING:
|
|
f->state = CLOSED;
|
|
if( f->callbacks->finished )
|
|
(*f->callbacks->finished)(f);
|
|
break;
|
|
case STOPPING:
|
|
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(f, inp, len)
|
|
fsm *f;
|
|
u_char *inp;
|
|
int len;
|
|
{
|
|
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!"));
|
|
return;
|
|
}
|
|
GETCHAR(code, inp);
|
|
GETCHAR(id, inp);
|
|
syslog(LOG_WARNING, "%s: Rcvd Code-Reject for code %d, id %d",
|
|
PROTO_NAME(f), code, id);
|
|
|
|
if( f->state == ACKRCVD )
|
|
f->state = REQSENT;
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_protreject - Peer doesn't speak this protocol.
|
|
*
|
|
* Treat this as a catastrophic error (RXJ-).
|
|
*/
|
|
void
|
|
fsm_protreject(f)
|
|
fsm *f;
|
|
{
|
|
switch( f->state ){
|
|
case CLOSING:
|
|
UNTIMEOUT(fsm_timeout, (caddr_t) 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, (caddr_t) 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, NULL, 0);
|
|
TIMEOUT(fsm_timeout, (caddr_t) f, f->timeouttime);
|
|
--f->retransmits;
|
|
|
|
f->state = STOPPING;
|
|
break;
|
|
|
|
default:
|
|
FSMDEBUG((LOG_INFO, "%s: Protocol-reject event in state %d!",
|
|
PROTO_NAME(f), f->state));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_sconfreq - Send a Configure-Request.
|
|
*/
|
|
static void
|
|
fsm_sconfreq(f, retransmit)
|
|
fsm *f;
|
|
int retransmit;
|
|
{
|
|
u_char *outp;
|
|
int outlen, 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;
|
|
}
|
|
|
|
/*
|
|
* Make up the request packet
|
|
*/
|
|
outp = outpacket_buf + DLLHEADERLEN + HEADERLEN;
|
|
if( f->callbacks->cilen && f->callbacks->addci ){
|
|
cilen = (*f->callbacks->cilen)(f);
|
|
if( cilen > peer_mru[f->unit] - 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, (caddr_t) f, f->timeouttime);
|
|
|
|
FSMDEBUG((LOG_INFO, "%s: sending Configure-Request, id %d",
|
|
PROTO_NAME(f), f->reqid));
|
|
}
|
|
|
|
|
|
/*
|
|
* fsm_sdata - Send some data.
|
|
*
|
|
* 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;
|
|
{
|
|
u_char *outp;
|
|
int outlen;
|
|
|
|
/* Adjust length to be smaller than MTU */
|
|
outp = outpacket_buf;
|
|
if (datalen > peer_mru[f->unit] - HEADERLEN)
|
|
datalen = peer_mru[f->unit] - HEADERLEN;
|
|
if (datalen && data != outp + DLLHEADERLEN + HEADERLEN)
|
|
BCOPY(data, outp + DLLHEADERLEN + HEADERLEN, datalen);
|
|
outlen = datalen + HEADERLEN;
|
|
MAKEHEADER(outp, f->protocol);
|
|
PUTCHAR(code, outp);
|
|
PUTCHAR(id, outp);
|
|
PUTSHORT(outlen, outp);
|
|
output(f->unit, outpacket_buf, outlen + DLLHEADERLEN);
|
|
|
|
FSMDEBUG((LOG_INFO, "fsm_sdata(%s): Sent code %d, id %d.",
|
|
PROTO_NAME(f), code, id));
|
|
}
|