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|
/*
* PPP Finite State Machine for LCP/IPCP
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* 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 the Internet Initiative Japan, Inc. The name of the
* IIJ 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.
*
* $Id: fsm.c,v 1.22 1997/11/22 03:37:31 brian Exp $
*
* TODO:
* o Refer loglevel for log output
* o Better option log display
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "hdlc.h"
#include "lqr.h"
#include "lcpproto.h"
#include "lcp.h"
#include "ccp.h"
#include "modem.h"
#include "loadalias.h"
#include "vars.h"
u_char AckBuff[200];
u_char NakBuff[200];
u_char RejBuff[100];
u_char ReqBuff[200];
u_char *ackp = NULL;
u_char *nakp = NULL;
u_char *rejp = NULL;
static void FsmSendConfigReq(struct fsm *);
static void FsmSendTerminateReq(struct fsm *);
static void FsmInitRestartCounter(struct fsm *);
char const *StateNames[] = {
"Initial", "Starting", "Closed", "Stopped", "Closing", "Stopping",
"Req-Sent", "Ack-Rcvd", "Ack-Sent", "Opened",
};
static void
StoppedTimeout(void *v)
{
struct fsm *fp = (struct fsm *)v;
LogPrintf(fp->LogLevel, "Stopped timer expired\n");
if (modem != -1)
DownConnection();
else
FsmDown(fp);
}
void
FsmInit(struct fsm * fp)
{
LogPrintf(LogDEBUG, "FsmInit\n");
fp->state = ST_INITIAL;
fp->reqid = 1;
fp->restart = 1;
fp->maxconfig = 3;
}
static void
NewState(struct fsm * fp, int new)
{
LogPrintf(fp->LogLevel, "State change %s --> %s\n",
StateNames[fp->state], StateNames[new]);
if (fp->state == ST_STOPPED && fp->StoppedTimer.state == TIMER_RUNNING)
StopTimer(&fp->StoppedTimer);
fp->state = new;
if ((new >= ST_INITIAL && new <= ST_STOPPED) || (new == ST_OPENED)) {
StopTimer(&fp->FsmTimer);
if (new == ST_STOPPED && fp->StoppedTimer.load) {
fp->StoppedTimer.state = TIMER_STOPPED;
fp->StoppedTimer.func = StoppedTimeout;
fp->StoppedTimer.arg = (void *) fp;
StartTimer(&fp->StoppedTimer);
}
}
}
void
FsmOutput(struct fsm * fp, u_int code, u_int id, u_char * ptr, int count)
{
int plen;
struct fsmheader lh;
struct mbuf *bp;
plen = sizeof(struct fsmheader) + count;
lh.code = code;
lh.id = id;
lh.length = htons(plen);
bp = mballoc(plen, MB_FSM);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
if (count)
memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count);
LogDumpBp(LogDEBUG, "FsmOutput", bp);
HdlcOutput(PRI_LINK, fp->proto, bp);
}
void
FsmOpen(struct fsm * fp)
{
switch (fp->state) {
case ST_INITIAL:
(fp->LayerStart) (fp);
NewState(fp, ST_STARTING);
break;
case ST_STARTING:
break;
case ST_CLOSED:
if (fp->open_mode == OPEN_PASSIVE) {
NewState(fp, ST_STOPPED);
} else {
FsmInitRestartCounter(fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
}
break;
case ST_STOPPED: /* XXX: restart option */
case ST_REQSENT:
case ST_ACKRCVD:
case ST_ACKSENT:
case ST_OPENED: /* XXX: restart option */
break;
case ST_CLOSING: /* XXX: restart option */
case ST_STOPPING: /* XXX: restart option */
NewState(fp, ST_STOPPING);
break;
}
}
void
FsmUp(struct fsm * fp)
{
switch (fp->state) {
case ST_INITIAL:
NewState(fp, ST_CLOSED);
break;
case ST_STARTING:
FsmInitRestartCounter(fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
default:
LogPrintf(fp->LogLevel, "Oops, Up at %s\n", StateNames[fp->state]);
break;
}
}
void
FsmDown(struct fsm * fp)
{
switch (fp->state) {
case ST_CLOSED:
case ST_CLOSING:
NewState(fp, ST_INITIAL);
break;
case ST_STOPPED:
(fp->LayerStart) (fp);
/* Fall into.. */
case ST_STOPPING:
case ST_REQSENT:
case ST_ACKRCVD:
case ST_ACKSENT:
NewState(fp, ST_STARTING);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
NewState(fp, ST_STARTING);
break;
}
}
void
FsmClose(struct fsm * fp)
{
switch (fp->state) {
case ST_STARTING:
NewState(fp, ST_INITIAL);
break;
case ST_STOPPED:
NewState(fp, ST_CLOSED);
break;
case ST_STOPPING:
NewState(fp, ST_CLOSING);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
/* Fall down */
case ST_REQSENT:
case ST_ACKRCVD:
case ST_ACKSENT:
FsmInitRestartCounter(fp);
FsmSendTerminateReq(fp);
NewState(fp, ST_CLOSING);
break;
}
}
/*
* Send functions
*/
static void
FsmSendConfigReq(struct fsm * fp)
{
if (--fp->maxconfig > 0) {
(fp->SendConfigReq) (fp);
StartTimer(&fp->FsmTimer); /* Start restart timer */
fp->restart--; /* Decrement restart counter */
} else {
FsmClose(fp);
}
}
static void
FsmSendTerminateReq(struct fsm * fp)
{
LogPrintf(fp->LogLevel, "SendTerminateReq.\n");
FsmOutput(fp, CODE_TERMREQ, fp->reqid++, NULL, 0);
(fp->SendTerminateReq) (fp);
StartTimer(&fp->FsmTimer); /* Start restart timer */
fp->restart--; /* Decrement restart counter */
}
static void
FsmSendConfigAck(struct fsm * fp,
struct fsmheader * lhp,
u_char * option,
int count)
{
LogPrintf(fp->LogLevel, "SendConfigAck(%s)\n", StateNames[fp->state]);
(fp->DecodeConfig) (option, count, MODE_NOP);
FsmOutput(fp, CODE_CONFIGACK, lhp->id, option, count);
}
static void
FsmSendConfigRej(struct fsm * fp,
struct fsmheader * lhp,
u_char * option,
int count)
{
LogPrintf(fp->LogLevel, "SendConfigRej(%s)\n", StateNames[fp->state]);
(fp->DecodeConfig) (option, count, MODE_NOP);
FsmOutput(fp, CODE_CONFIGREJ, lhp->id, option, count);
}
static void
FsmSendConfigNak(struct fsm * fp,
struct fsmheader * lhp,
u_char * option,
int count)
{
LogPrintf(fp->LogLevel, "SendConfigNak(%s)\n", StateNames[fp->state]);
(fp->DecodeConfig) (option, count, MODE_NOP);
FsmOutput(fp, CODE_CONFIGNAK, lhp->id, option, count);
}
/*
* Timeout actions
*/
static void
FsmTimeout(void *v)
{
struct fsm *fp = (struct fsm *)v;
if (fp->restart) {
switch (fp->state) {
case ST_CLOSING:
case ST_STOPPING:
FsmSendTerminateReq(fp);
break;
case ST_REQSENT:
case ST_ACKSENT:
FsmSendConfigReq(fp);
break;
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
StartTimer(&fp->FsmTimer);
} else {
switch (fp->state) {
case ST_CLOSING:
NewState(fp, ST_CLOSED);
(fp->LayerFinish) (fp);
break;
case ST_STOPPING:
NewState(fp, ST_STOPPED);
(fp->LayerFinish) (fp);
break;
case ST_REQSENT: /* XXX: 3p */
case ST_ACKSENT:
case ST_ACKRCVD:
NewState(fp, ST_STOPPED);
(fp->LayerFinish) (fp);
break;
}
}
}
static void
FsmInitRestartCounter(struct fsm * fp)
{
StopTimer(&fp->FsmTimer);
fp->FsmTimer.state = TIMER_STOPPED;
fp->FsmTimer.func = FsmTimeout;
fp->FsmTimer.arg = (void *) fp;
(fp->InitRestartCounter) (fp);
}
/*
* Actions when receive packets
*/
static void
FsmRecvConfigReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RCR */
{
int plen, flen;
int ackaction = 0;
plen = plength(bp);
flen = ntohs(lhp->length) - sizeof(*lhp);
if (plen < flen) {
LogPrintf(LogERROR, "FsmRecvConfigReq: plen (%d) < flen (%d)\n",
plen, flen);
pfree(bp);
return;
}
/*
* Check and process easy case
*/
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
LogPrintf(fp->LogLevel, "Oops, RCR in %s.\n", StateNames[fp->state]);
pfree(bp);
return;
case ST_CLOSED:
(fp->SendTerminateAck) (fp);
pfree(bp);
return;
case ST_CLOSING:
LogPrintf(LogERROR, "Got ConfigReq while state = %d\n", fp->state);
case ST_STOPPING:
pfree(bp);
return;
}
(fp->DecodeConfig) (MBUF_CTOP(bp), flen, MODE_REQ);
if (nakp == NakBuff && rejp == RejBuff)
ackaction = 1;
switch (fp->state) {
case ST_OPENED:
(fp->LayerDown) (fp);
FsmSendConfigReq(fp);
break;
case ST_STOPPED:
FsmInitRestartCounter(fp);
FsmSendConfigReq(fp);
break;
}
if (rejp != RejBuff)
FsmSendConfigRej(fp, lhp, RejBuff, rejp - RejBuff);
if (nakp != NakBuff)
FsmSendConfigNak(fp, lhp, NakBuff, nakp - NakBuff);
if (ackaction)
FsmSendConfigAck(fp, lhp, AckBuff, ackp - AckBuff);
switch (fp->state) {
case ST_STOPPED:
case ST_OPENED:
if (ackaction)
NewState(fp, ST_ACKSENT);
else
NewState(fp, ST_REQSENT);
break;
case ST_REQSENT:
if (ackaction)
NewState(fp, ST_ACKSENT);
break;
case ST_ACKRCVD:
if (ackaction) {
NewState(fp, ST_OPENED);
(fp->LayerUp) (fp);
}
break;
case ST_ACKSENT:
if (!ackaction)
NewState(fp, ST_REQSENT);
break;
}
pfree(bp);
}
static void
FsmRecvConfigAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RCA */
{
switch (fp->state) {
case ST_CLOSED:
case ST_STOPPED:
(fp->SendTerminateAck) (fp);
break;
case ST_CLOSING:
case ST_STOPPING:
break;
case ST_REQSENT:
FsmInitRestartCounter(fp);
NewState(fp, ST_ACKRCVD);
break;
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
case ST_ACKSENT:
FsmInitRestartCounter(fp);
NewState(fp, ST_OPENED);
(fp->LayerUp) (fp);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
pfree(bp);
}
static void
FsmRecvConfigNak(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RCN */
{
int plen, flen;
plen = plength(bp);
flen = ntohs(lhp->length) - sizeof(*lhp);
if (plen < flen) {
pfree(bp);
return;
}
/*
* Check and process easy case
*/
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
LogPrintf(fp->LogLevel, "Oops, RCN in %s.\n", StateNames[fp->state]);
pfree(bp);
return;
case ST_CLOSED:
case ST_STOPPED:
(fp->SendTerminateAck) (fp);
pfree(bp);
return;
case ST_CLOSING:
case ST_STOPPING:
pfree(bp);
return;
}
(fp->DecodeConfig) (MBUF_CTOP(bp), flen, MODE_NAK);
switch (fp->state) {
case ST_REQSENT:
case ST_ACKSENT:
FsmInitRestartCounter(fp);
FsmSendConfigReq(fp);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
/* Fall down */
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
pfree(bp);
}
static void
FsmRecvTermReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RTR */
{
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
LogPrintf(fp->LogLevel, "Oops, RTR in %s\n", StateNames[fp->state]);
break;
case ST_CLOSED:
case ST_STOPPED:
case ST_CLOSING:
case ST_STOPPING:
case ST_REQSENT:
(fp->SendTerminateAck) (fp);
break;
case ST_ACKRCVD:
case ST_ACKSENT:
(fp->SendTerminateAck) (fp);
NewState(fp, ST_REQSENT);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
(fp->SendTerminateAck) (fp);
StartTimer(&fp->FsmTimer); /* Start restart timer */
fp->restart = 0;
NewState(fp, ST_STOPPING);
break;
}
pfree(bp);
}
static void
FsmRecvTermAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RTA */
{
switch (fp->state) {
case ST_CLOSING:
NewState(fp, ST_CLOSED);
(fp->LayerFinish) (fp);
break;
case ST_STOPPING:
NewState(fp, ST_STOPPED);
(fp->LayerFinish) (fp);
break;
case ST_ACKRCVD:
NewState(fp, ST_REQSENT);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
pfree(bp);
}
static void
FsmRecvConfigRej(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RCJ */
{
int plen, flen;
plen = plength(bp);
flen = ntohs(lhp->length) - sizeof(*lhp);
if (plen < flen) {
pfree(bp);
return;
}
LogPrintf(fp->LogLevel, "RecvConfigRej.\n");
/*
* Check and process easy case
*/
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
LogPrintf(fp->LogLevel, "Oops, RCJ in %s.\n", StateNames[fp->state]);
pfree(bp);
return;
case ST_CLOSED:
case ST_STOPPED:
(fp->SendTerminateAck) (fp);
pfree(bp);
return;
case ST_CLOSING:
case ST_STOPPING:
pfree(bp);
return;
}
(fp->DecodeConfig) (MBUF_CTOP(bp), flen, MODE_REJ);
switch (fp->state) {
case ST_REQSENT:
case ST_ACKSENT:
FsmInitRestartCounter(fp);
FsmSendConfigReq(fp);
break;
case ST_OPENED:
(fp->LayerDown) (fp);
/* Fall down */
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
pfree(bp);
}
static void
FsmRecvCodeRej(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
LogPrintf(fp->LogLevel, "RecvCodeRej\n");
pfree(bp);
}
static void
FsmRecvProtoRej(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
u_short *sp, proto;
sp = (u_short *) MBUF_CTOP(bp);
proto = ntohs(*sp);
LogPrintf(fp->LogLevel, "-- Protocol (%04x) was rejected.\n", proto);
switch (proto) {
case PROTO_LQR:
StopLqr(LQM_LQR);
break;
case PROTO_CCP:
fp = &CcpFsm;
(fp->LayerFinish) (fp);
switch (fp->state) {
case ST_CLOSED:
case ST_CLOSING:
NewState(fp, ST_CLOSED);
default:
NewState(fp, ST_STOPPED);
break;
}
break;
}
pfree(bp);
}
static void
FsmRecvEchoReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
u_char *cp;
u_long *lp, magic;
cp = MBUF_CTOP(bp);
lp = (u_long *) cp;
magic = ntohl(*lp);
if (magic != LcpInfo.his_magic) {
LogPrintf(LogERROR, "RecvEchoReq: his magic is bad!!\n");
/* XXX: We should send terminate request */
}
if (fp->state == ST_OPENED) {
*lp = htonl(LcpInfo.want_magic); /* Insert local magic number */
LogPrintf(fp->LogLevel, "SendEchoRep(%s)\n", StateNames[fp->state]);
FsmOutput(fp, CODE_ECHOREP, lhp->id, cp, plength(bp));
}
pfree(bp);
}
static void
FsmRecvEchoRep(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
u_long *lp, magic;
lp = (u_long *) MBUF_CTOP(bp);
magic = ntohl(*lp);
/*
* Tolerate echo replies with either magic number
*/
if (magic != 0 && magic != LcpInfo.his_magic && magic != LcpInfo.want_magic) {
LogPrintf(LogERROR, "RecvEchoRep: his magic is wrong! expect: %x got: %x\n",
LcpInfo.his_magic, magic);
/*
* XXX: We should send terminate request. But poor implementation may die
* as a result.
*/
}
RecvEchoLqr(bp);
pfree(bp);
}
static void
FsmRecvDiscReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
LogPrintf(fp->LogLevel, "RecvDiscReq\n");
pfree(bp);
}
static void
FsmRecvIdent(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
LogPrintf(fp->LogLevel, "RecvIdent\n");
pfree(bp);
}
static void
FsmRecvTimeRemain(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
LogPrintf(fp->LogLevel, "RecvTimeRemain\n");
pfree(bp);
}
static void
FsmRecvResetReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
LogPrintf(fp->LogLevel, "RecvResetReq\n");
CcpRecvResetReq(fp);
LogPrintf(fp->LogLevel, "SendResetAck\n");
FsmOutput(fp, CODE_RESETACK, fp->reqid, NULL, 0);
pfree(bp);
}
static void
FsmRecvResetAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
LogPrintf(fp->LogLevel, "RecvResetAck\n");
CcpResetInput();
fp->reqid++;
pfree(bp);
}
static const struct fsmcodedesc FsmCodes[] = {
{FsmRecvConfigReq, "Configure Request",},
{FsmRecvConfigAck, "Configure Ack",},
{FsmRecvConfigNak, "Configure Nak",},
{FsmRecvConfigRej, "Configure Reject",},
{FsmRecvTermReq, "Terminate Request",},
{FsmRecvTermAck, "Terminate Ack",},
{FsmRecvCodeRej, "Code Reject",},
{FsmRecvProtoRej, "Protocol Reject",},
{FsmRecvEchoReq, "Echo Request",},
{FsmRecvEchoRep, "Echo Reply",},
{FsmRecvDiscReq, "Discard Request",},
{FsmRecvIdent, "Ident",},
{FsmRecvTimeRemain, "Time Remain",},
{FsmRecvResetReq, "Reset Request",},
{FsmRecvResetAck, "Reset Ack",},
};
void
FsmInput(struct fsm * fp, struct mbuf * bp)
{
int len;
struct fsmheader *lhp;
const struct fsmcodedesc *codep;
len = plength(bp);
if (len < sizeof(struct fsmheader)) {
pfree(bp);
return;
}
lhp = (struct fsmheader *) MBUF_CTOP(bp);
if (lhp->code == 0 || lhp->code > fp->max_code) {
pfree(bp); /* XXX: Should send code reject */
return;
}
bp->offset += sizeof(struct fsmheader);
bp->cnt -= sizeof(struct fsmheader);
codep = FsmCodes + lhp->code - 1;
LogPrintf(fp->LogLevel, "Received %s (%d) state = %s (%d)\n",
codep->name, lhp->id, StateNames[fp->state], fp->state);
if (LogIsKept(LogDEBUG))
LogMemory();
(codep->action) (fp, lhp, bp);
if (LogIsKept(LogDEBUG))
LogMemory();
}
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