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479508cf28
freebsd-dev/usr.sbin/ppp/fsm.c
Brian Somers 479508cf28 Allow control over the number of ConfigREQ & TermREQ attempts 
that are made in each of the FSMs (LCP, CCP & IPCP) and the
number of REQs/Challenges for PAP/CHAP by accepting more arguments
in the ``set {c,ip,l}cpretry'' and ``set {ch,p}apretry'' commands.

Change the non-convergence thresholds to 3 times the number of configured
REQ tries (rather than the previous fixed ``10'').  We now notice
repeated NAKs and REJs rather than just REQs.

Don't suggest that CHAP 0x05 isn't supported when it's not configured.

Fix some bugs that expose themselves with smaller numbers of retries:
o Handle instantaneous disconnects (set device /dev/null) correctly
  by stopping all fsm timers in fsm2initial.
o Don't forget to uu_unlock() devices that are files but are not
  ttys (set device /dev/zero).

Fix a *HORRENDOUS* bug in RFC1661 (already fixed for an Open event in state
``Closed''):
  According to the state transition table, a RCR+ or RCR- received in
  the ``Stopped'' state are supposed to InitRestartCounter, SendConfigReq
  and SendConfig{Ack,Nak}.  However, in ``Stopped'', we haven't yet
  done a TLS (or the last thing we did is a TLF).  We must therefore
  do the TLS at this point !

  This was never noticed before because LCP and CCP used not use
  LayerStart() for anything interesting, and IPCP tends to go into
  Stopped then get a Down because of an LCP RTR rather than getting a
  RCR again.
1999-02-26 21:28:14 +00:00

1047 lines
26 KiB
C
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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 1.38 1999/01/28 01:56:31 brian Exp $
*
* TODO:
*/
#include <sys/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/un.h>
#include <string.h>
#include <termios.h>
#include "ua.h"
#include "mbuf.h"
#include "log.h"
#include "defs.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "slcompress.h"
#include "ipcp.h"
#include "filter.h"
#include "descriptor.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "bundle.h"
#include "async.h"
#include "physical.h"
#include "lcpproto.h"
static void FsmSendConfigReq(struct fsm *);
static void FsmSendTerminateReq(struct fsm *);
static void FsmInitRestartCounter(struct fsm *, int);
typedef void (recvfn)(struct fsm *, struct fsmheader *, struct mbuf *);
static recvfn FsmRecvConfigReq, FsmRecvConfigAck, FsmRecvConfigNak,
FsmRecvConfigRej, FsmRecvTermReq, FsmRecvTermAck,
FsmRecvCodeRej, FsmRecvProtoRej, FsmRecvEchoReq,
FsmRecvEchoRep, FsmRecvDiscReq, FsmRecvIdent,
FsmRecvTimeRemain, FsmRecvResetReq, FsmRecvResetAck;
static const struct fsmcodedesc {
recvfn *recv;
unsigned check_reqid : 1;
unsigned inc_reqid : 1;
const char *name;
} FsmCodes[] = {
{ FsmRecvConfigReq, 0, 0, "ConfigReq" },
{ FsmRecvConfigAck, 1, 1, "ConfigAck" },
{ FsmRecvConfigNak, 1, 1, "ConfigNak" },
{ FsmRecvConfigRej, 1, 1, "ConfigRej" },
{ FsmRecvTermReq, 0, 0, "TerminateReq" },
{ FsmRecvTermAck, 1, 1, "TerminateAck" },
{ FsmRecvCodeRej, 0, 0, "CodeRej" },
{ FsmRecvProtoRej, 0, 0, "ProtocolRej" },
{ FsmRecvEchoReq, 0, 0, "EchoRequest" },
{ FsmRecvEchoRep, 0, 0, "EchoReply" },
{ FsmRecvDiscReq, 0, 0, "DiscardReq" },
{ FsmRecvIdent, 0, 0, "Ident" },
{ FsmRecvTimeRemain,0, 0, "TimeRemain" },
{ FsmRecvResetReq, 0, 0, "ResetReqt" },
{ FsmRecvResetAck, 0, 1, "ResetAck" }
};
static const char *
Code2Nam(u_int code)
{
if (code == 0 || code > sizeof FsmCodes / sizeof FsmCodes[0])
return "Unknown";
return FsmCodes[code-1].name;
}
const char *
State2Nam(u_int state)
{
static const char *StateNames[] = {
"Initial", "Starting", "Closed", "Stopped", "Closing", "Stopping",
"Req-Sent", "Ack-Rcvd", "Ack-Sent", "Opened",
};
if (state >= sizeof StateNames / sizeof StateNames[0])
return "unknown";
return StateNames[state];
}
static void
StoppedTimeout(void *v)
{
struct fsm *fp = (struct fsm *)v;
log_Printf(fp->LogLevel, "%s: Stopped timer expired\n", fp->link->name);
if (fp->OpenTimer.state == TIMER_RUNNING) {
log_Printf(LogWARN, "%s: %s: aborting open delay due to stopped timer\n",
fp->link->name, fp->name);
timer_Stop(&fp->OpenTimer);
}
if (fp->state == ST_STOPPED)
fsm2initial(fp);
}
void
fsm_Init(struct fsm *fp, const char *name, u_short proto, int mincode,
int maxcode, int LogLevel, struct bundle *bundle,
struct link *l, const struct fsm_parent *parent,
struct fsm_callbacks *fn, const char *timer_names[3])
{
fp->name = name;
fp->proto = proto;
fp->min_code = mincode;
fp->max_code = maxcode;
fp->state = fp->min_code > CODE_TERMACK ? ST_OPENED : ST_INITIAL;
fp->reqid = 1;
fp->restart = 1;
fp->more.reqs = fp->more.naks = fp->more.rejs = 1;
memset(&fp->FsmTimer, '\0', sizeof fp->FsmTimer);
memset(&fp->OpenTimer, '\0', sizeof fp->OpenTimer);
memset(&fp->StoppedTimer, '\0', sizeof fp->StoppedTimer);
fp->LogLevel = LogLevel;
fp->link = l;
fp->bundle = bundle;
fp->parent = parent;
fp->fn = fn;
fp->FsmTimer.name = timer_names[0];
fp->OpenTimer.name = timer_names[1];
fp->StoppedTimer.name = timer_names[2];
}
static void
NewState(struct fsm * fp, int new)
{
log_Printf(fp->LogLevel, "%s: State change %s --> %s\n",
fp->link->name, State2Nam(fp->state), State2Nam(new));
if (fp->state == ST_STOPPED && fp->StoppedTimer.state == TIMER_RUNNING)
timer_Stop(&fp->StoppedTimer);
fp->state = new;
if ((new >= ST_INITIAL && new <= ST_STOPPED) || (new == ST_OPENED)) {
timer_Stop(&fp->FsmTimer);
if (new == ST_STOPPED && fp->StoppedTimer.load) {
timer_Stop(&fp->StoppedTimer);
fp->StoppedTimer.func = StoppedTimeout;
fp->StoppedTimer.arg = (void *) fp;
timer_Start(&fp->StoppedTimer);
}
}
}
void
fsm_Output(struct fsm *fp, u_int code, u_int id, u_char *ptr, int count)
{
int plen;
struct fsmheader lh;
struct mbuf *bp;
if (log_IsKept(fp->LogLevel)) {
log_Printf(fp->LogLevel, "%s: Send%s(%d) state = %s\n",
fp->link->name, Code2Nam(code), id, State2Nam(fp->state));
switch (code) {
case CODE_CONFIGREQ:
case CODE_CONFIGACK:
case CODE_CONFIGREJ:
case CODE_CONFIGNAK:
(*fp->fn->DecodeConfig)(fp, ptr, count, MODE_NOP, NULL);
if (count < sizeof(struct fsmconfig))
log_Printf(fp->LogLevel, " [EMPTY]\n");
break;
}
}
plen = sizeof(struct fsmheader) + count;
lh.code = code;
lh.id = id;
lh.length = htons(plen);
bp = mbuf_Alloc(plen, MB_FSM);
memcpy(MBUF_CTOP(bp), &lh, sizeof(struct fsmheader));
if (count)
memcpy(MBUF_CTOP(bp) + sizeof(struct fsmheader), ptr, count);
log_DumpBp(LogDEBUG, "fsm_Output", bp);
hdlc_Output(fp->link, PRI_LINK, fp->proto, bp);
}
static void
FsmOpenNow(void *v)
{
struct fsm *fp = (struct fsm *)v;
timer_Stop(&fp->OpenTimer);
if (fp->state <= ST_STOPPED) {
if (fp->state != ST_STARTING) {
/*
* In practice, we're only here in ST_STOPPED (when delaying the
* first config request) or ST_CLOSED (when openmode == 0).
*
* The ST_STOPPED bit is breaking the RFC already :-(
*
* According to the RFC (1661) state transition table, a TLS isn't
* required for an Open event when state == Closed, but the RFC
* must be wrong as TLS hasn't yet been called (since the last TLF)
* ie, Initial gets an `Up' event, Closing gets a RTA etc.
*/
(*fp->fn->LayerStart)(fp);
(*fp->parent->LayerStart)(fp->parent->object, fp);
}
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
}
}
void
fsm_Open(struct fsm * fp)
{
switch (fp->state) {
case ST_INITIAL:
NewState(fp, ST_STARTING);
(*fp->fn->LayerStart)(fp);
(*fp->parent->LayerStart)(fp->parent->object, fp);
break;
case ST_CLOSED:
if (fp->open_mode == OPEN_PASSIVE) {
NewState(fp, ST_STOPPED); /* XXX: This is a hack ! */
} else if (fp->open_mode > 0) {
if (fp->open_mode > 1)
log_Printf(LogPHASE, "%s: Entering STOPPED state for %d seconds\n",
fp->link->name, fp->open_mode);
NewState(fp, ST_STOPPED); /* XXX: This is a not-so-bad hack ! */
timer_Stop(&fp->OpenTimer);
fp->OpenTimer.load = fp->open_mode * SECTICKS;
fp->OpenTimer.func = FsmOpenNow;
fp->OpenTimer.arg = (void *)fp;
timer_Start(&fp->OpenTimer);
} else
FsmOpenNow(fp);
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
fsm_Up(struct fsm * fp)
{
switch (fp->state) {
case ST_INITIAL:
log_Printf(fp->LogLevel, "FSM: Using \"%s\" as a transport\n",
fp->link->name);
NewState(fp, ST_CLOSED);
break;
case ST_STARTING:
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
default:
log_Printf(fp->LogLevel, "%s: Oops, Up at %s\n",
fp->link->name, State2Nam(fp->state));
break;
}
}
void
fsm_Down(struct fsm *fp)
{
switch (fp->state) {
case ST_CLOSED:
NewState(fp, ST_INITIAL);
break;
case ST_CLOSING:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_INITIAL);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
case ST_STOPPED:
NewState(fp, ST_STARTING);
(*fp->fn->LayerStart)(fp);
(*fp->parent->LayerStart)(fp->parent->object, fp);
break;
case ST_STOPPING:
case ST_REQSENT:
case ST_ACKRCVD:
case ST_ACKSENT:
NewState(fp, ST_STARTING);
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
NewState(fp, ST_STARTING);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
}
}
void
fsm_Close(struct fsm *fp)
{
switch (fp->state) {
case ST_STARTING:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_INITIAL);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
case ST_STOPPED:
NewState(fp, ST_CLOSED);
break;
case ST_STOPPING:
NewState(fp, ST_CLOSING);
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
FsmSendTerminateReq(fp);
NewState(fp, ST_CLOSING);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
case ST_REQSENT:
case ST_ACKRCVD:
case ST_ACKSENT:
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
FsmSendTerminateReq(fp);
NewState(fp, ST_CLOSING);
break;
}
}
/*
* Send functions
*/
static void
FsmSendConfigReq(struct fsm * fp)
{
if (fp->more.reqs-- > 0 && fp->restart-- > 0) {
(*fp->fn->SendConfigReq)(fp);
timer_Start(&fp->FsmTimer); /* Start restart timer */
} else {
if (fp->more.reqs < 0)
log_Printf(LogPHASE, "%s: Too many %s REQs sent - abandoning "
"negotiation\n", fp->link->name, fp->name);
fsm_Close(fp);
}
}
static void
FsmSendTerminateReq(struct fsm *fp)
{
fsm_Output(fp, CODE_TERMREQ, fp->reqid, NULL, 0);
(*fp->fn->SentTerminateReq)(fp);
timer_Start(&fp->FsmTimer); /* Start restart timer */
fp->restart--; /* Decrement restart counter */
}
/*
* 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;
}
timer_Start(&fp->FsmTimer);
} else {
switch (fp->state) {
case ST_CLOSING:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_CLOSED);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
case ST_STOPPING:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_STOPPED);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
case ST_REQSENT: /* XXX: 3p */
case ST_ACKSENT:
case ST_ACKRCVD:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_STOPPED);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
}
}
}
static void
FsmInitRestartCounter(struct fsm *fp, int what)
{
timer_Stop(&fp->FsmTimer);
fp->FsmTimer.func = FsmTimeout;
fp->FsmTimer.arg = (void *)fp;
(*fp->fn->InitRestartCounter)(fp, what);
}
/*
* Actions when receive packets
*/
static void
FsmRecvConfigReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
/* RCR */
{
struct fsm_decode dec;
int plen, flen;
int ackaction = 0;
plen = mbuf_Length(bp);
flen = ntohs(lhp->length) - sizeof *lhp;
if (plen < flen) {
log_Printf(LogWARN, "%s: FsmRecvConfigReq: plen (%d) < flen (%d)\n",
fp->link->name, plen, flen);
mbuf_Free(bp);
return;
}
/*
* Check and process easy case
*/
switch (fp->state) {
case ST_INITIAL:
if (fp->proto == PROTO_CCP && fp->link->lcp.fsm.state == ST_OPENED) {
/*
* ccp_SetOpenMode() leaves us in initial if we're disabling
* & denying everything. This is a bit smelly, we know that
* ``bp'' really has ``fsmheader'' in front of it, and CCP_PROTO
* in front of that. CCP_PROTO isn't compressed either 'cos it
* doesn't begin with 0x00....
*/
bp->offset -= sizeof(struct fsmheader) + 2;
bp->cnt += sizeof(struct fsmheader) + 2;
lcp_SendProtoRej(&fp->link->lcp, MBUF_CTOP(bp), bp->cnt);
mbuf_Free(bp);
return;
}
/* Drop through */
case ST_STARTING:
log_Printf(fp->LogLevel, "%s: Oops, RCR in %s.\n",
fp->link->name, State2Nam(fp->state));
mbuf_Free(bp);
return;
case ST_CLOSED:
(*fp->fn->SendTerminateAck)(fp, lhp->id);
mbuf_Free(bp);
return;
case ST_CLOSING:
log_Printf(fp->LogLevel, "%s: Error: Got ConfigReq while state = %s\n",
fp->link->name, State2Nam(fp->state));
case ST_STOPPING:
mbuf_Free(bp);
return;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
}
dec.ackend = dec.ack;
dec.nakend = dec.nak;
dec.rejend = dec.rej;
(*fp->fn->DecodeConfig)(fp, MBUF_CTOP(bp), flen, MODE_REQ, &dec);
if (flen < sizeof(struct fsmconfig))
log_Printf(fp->LogLevel, " [EMPTY]\n");
if (dec.nakend == dec.nak && dec.rejend == dec.rej)
ackaction = 1;
switch (fp->state) {
case ST_STOPPED:
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
/* Fall through */
case ST_OPENED:
FsmSendConfigReq(fp);
break;
}
if (dec.rejend != dec.rej)
fsm_Output(fp, CODE_CONFIGREJ, lhp->id, dec.rej, dec.rejend - dec.rej);
if (dec.nakend != dec.nak)
fsm_Output(fp, CODE_CONFIGNAK, lhp->id, dec.nak, dec.nakend - dec.nak);
if (ackaction)
fsm_Output(fp, CODE_CONFIGACK, lhp->id, dec.ack, dec.ackend - dec.ack);
switch (fp->state) {
case ST_STOPPED:
/*
* According to the RFC (1661) state transition table, a TLS isn't
* required for a RCR when state == ST_STOPPED, but the RFC
* must be wrong as TLS hasn't yet been called (since the last TLF)
*/
(*fp->fn->LayerStart)(fp);
(*fp->parent->LayerStart)(fp->parent->object, fp);
/* Fall through */
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);
if ((*fp->fn->LayerUp)(fp))
(*fp->parent->LayerUp)(fp->parent->object, fp);
else {
(*fp->fn->LayerDown)(fp);
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
FsmSendTerminateReq(fp);
NewState(fp, ST_CLOSING);
}
}
break;
case ST_ACKSENT:
if (!ackaction)
NewState(fp, ST_REQSENT);
break;
}
mbuf_Free(bp);
if (dec.rejend != dec.rej && --fp->more.rejs <= 0) {
log_Printf(LogPHASE, "%s: Too many %s REJs sent - abandoning negotiation\n",
fp->link->name, fp->name);
fsm_Close(fp);
}
if (dec.nakend != dec.nak && --fp->more.naks <= 0) {
fsm_Close(fp);
log_Printf(LogPHASE, "%s: Too many %s NAKs sent - abandoning negotiation\n",
fp->link->name, fp->name);
fsm_Close(fp);
}
}
static void
FsmRecvConfigAck(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
/* RCA */
{
switch (fp->state) {
case ST_CLOSED:
case ST_STOPPED:
(*fp->fn->SendTerminateAck)(fp, lhp->id);
break;
case ST_CLOSING:
case ST_STOPPING:
break;
case ST_REQSENT:
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
NewState(fp, ST_ACKRCVD);
break;
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
case ST_ACKSENT:
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
NewState(fp, ST_OPENED);
if ((*fp->fn->LayerUp)(fp))
(*fp->parent->LayerUp)(fp->parent->object, fp);
else {
(*fp->fn->LayerDown)(fp);
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
FsmSendTerminateReq(fp);
NewState(fp, ST_CLOSING);
}
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
}
mbuf_Free(bp);
}
static void
FsmRecvConfigNak(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
/* RCN */
{
struct fsm_decode dec;
int plen, flen;
plen = mbuf_Length(bp);
flen = ntohs(lhp->length) - sizeof *lhp;
if (plen < flen) {
mbuf_Free(bp);
return;
}
/*
* Check and process easy case
*/
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
log_Printf(fp->LogLevel, "%s: Oops, RCN in %s.\n",
fp->link->name, State2Nam(fp->state));
mbuf_Free(bp);
return;
case ST_CLOSED:
case ST_STOPPED:
(*fp->fn->SendTerminateAck)(fp, lhp->id);
mbuf_Free(bp);
return;
case ST_CLOSING:
case ST_STOPPING:
mbuf_Free(bp);
return;
}
dec.ackend = dec.ack;
dec.nakend = dec.nak;
dec.rejend = dec.rej;
(*fp->fn->DecodeConfig)(fp, MBUF_CTOP(bp), flen, MODE_NAK, &dec);
if (flen < sizeof(struct fsmconfig))
log_Printf(fp->LogLevel, " [EMPTY]\n");
switch (fp->state) {
case ST_REQSENT:
case ST_ACKSENT:
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
FsmSendConfigReq(fp);
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
mbuf_Free(bp);
}
static void
FsmRecvTermReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
/* RTR */
{
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
log_Printf(fp->LogLevel, "%s: Oops, RTR in %s\n",
fp->link->name, State2Nam(fp->state));
break;
case ST_CLOSED:
case ST_STOPPED:
case ST_CLOSING:
case ST_STOPPING:
case ST_REQSENT:
(*fp->fn->SendTerminateAck)(fp, lhp->id);
break;
case ST_ACKRCVD:
case ST_ACKSENT:
(*fp->fn->SendTerminateAck)(fp, lhp->id);
NewState(fp, ST_REQSENT);
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
(*fp->fn->SendTerminateAck)(fp, lhp->id);
FsmInitRestartCounter(fp, FSM_TRM_TIMER);
timer_Start(&fp->FsmTimer); /* Start restart timer */
fp->restart = 0;
NewState(fp, ST_STOPPING);
(*fp->parent->LayerDown)(fp->parent->object, fp);
/* A delayed ST_STOPPED is now scheduled */
break;
}
mbuf_Free(bp);
}
static void
FsmRecvTermAck(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
/* RTA */
{
switch (fp->state) {
case ST_CLOSING:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_CLOSED);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
case ST_STOPPING:
(*fp->fn->LayerFinish)(fp);
NewState(fp, ST_STOPPED);
(*fp->parent->LayerFinish)(fp->parent->object, fp);
break;
case ST_ACKRCVD:
NewState(fp, ST_REQSENT);
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
}
mbuf_Free(bp);
}
static void
FsmRecvConfigRej(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
/* RCJ */
{
struct fsm_decode dec;
int plen, flen;
plen = mbuf_Length(bp);
flen = ntohs(lhp->length) - sizeof *lhp;
if (plen < flen) {
mbuf_Free(bp);
return;
}
/*
* Check and process easy case
*/
switch (fp->state) {
case ST_INITIAL:
case ST_STARTING:
log_Printf(fp->LogLevel, "%s: Oops, RCJ in %s.\n",
fp->link->name, State2Nam(fp->state));
mbuf_Free(bp);
return;
case ST_CLOSED:
case ST_STOPPED:
(*fp->fn->SendTerminateAck)(fp, lhp->id);
mbuf_Free(bp);
return;
case ST_CLOSING:
case ST_STOPPING:
mbuf_Free(bp);
return;
}
dec.ackend = dec.ack;
dec.nakend = dec.nak;
dec.rejend = dec.rej;
(*fp->fn->DecodeConfig)(fp, MBUF_CTOP(bp), flen, MODE_REJ, &dec);
if (flen < sizeof(struct fsmconfig))
log_Printf(fp->LogLevel, " [EMPTY]\n");
switch (fp->state) {
case ST_REQSENT:
case ST_ACKSENT:
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
FsmSendConfigReq(fp);
break;
case ST_OPENED:
(*fp->fn->LayerDown)(fp);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
(*fp->parent->LayerDown)(fp->parent->object, fp);
break;
case ST_ACKRCVD:
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
break;
}
mbuf_Free(bp);
}
static void
FsmRecvCodeRej(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
{
mbuf_Free(bp);
}
static void
FsmRecvProtoRej(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
{
struct physical *p = link2physical(fp->link);
u_short *sp, proto;
sp = (u_short *)MBUF_CTOP(bp);
proto = ntohs(*sp);
log_Printf(fp->LogLevel, "%s: -- Protocol 0x%04x (%s) was rejected!\n",
fp->link->name, proto, hdlc_Protocol2Nam(proto));
switch (proto) {
case PROTO_LQR:
if (p)
lqr_Stop(p, LQM_LQR);
else
log_Printf(LogERROR, "%s: FsmRecvProtoRej: Not a physical link !\n",
fp->link->name);
break;
case PROTO_CCP:
if (fp->proto == PROTO_LCP) {
fp = &fp->link->ccp.fsm;
(*fp->fn->LayerFinish)(fp);
switch (fp->state) {
case ST_CLOSED:
case ST_CLOSING:
NewState(fp, ST_CLOSED);
default:
NewState(fp, ST_STOPPED);
break;
}
(*fp->parent->LayerFinish)(fp->parent->object, fp);
}
break;
case PROTO_MP:
if (fp->proto == PROTO_LCP) {
struct lcp *lcp = fsm2lcp(fp);
if (lcp->want_mrru && lcp->his_mrru) {
log_Printf(LogPHASE, "%s: MP protocol reject is fatal !\n",
fp->link->name);
fsm_Close(fp);
}
}
break;
}
mbuf_Free(bp);
}
static void
FsmRecvEchoReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
{
struct lcp *lcp = fsm2lcp(fp);
u_char *cp;
u_int32_t magic;
if (lcp) {
cp = MBUF_CTOP(bp);
ua_ntohl(cp, &magic);
if (magic != lcp->his_magic) {
log_Printf(fp->LogLevel, "%s: RecvEchoReq: Error: His magic is bad!!\n",
fp->link->name);
/* XXX: We should send terminate request */
}
if (fp->state == ST_OPENED) {
ua_htonl(&lcp->want_magic, cp); /* local magic */
fsm_Output(fp, CODE_ECHOREP, lhp->id, cp, mbuf_Length(bp));
}
}
mbuf_Free(bp);
}
static void
FsmRecvEchoRep(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
{
struct lcp *lcp = fsm2lcp(fp);
u_int32_t magic;
if (lcp) {
ua_ntohl(MBUF_CTOP(bp), &magic);
/* Tolerate echo replies with either magic number */
if (magic != 0 && magic != lcp->his_magic && magic != lcp->want_magic) {
log_Printf(LogWARN,
"%s: RecvEchoRep: Bad magic: expected 0x%08x, got: 0x%08x\n",
fp->link->name, lcp->his_magic, magic);
/*
* XXX: We should send terminate request. But poor implementations may
* die as a result.
*/
}
lqr_RecvEcho(fp, bp);
}
mbuf_Free(bp);
}
static void
FsmRecvDiscReq(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
mbuf_Free(bp);
}
static void
FsmRecvIdent(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
mbuf_Free(bp);
}
static void
FsmRecvTimeRemain(struct fsm * fp, struct fsmheader * lhp, struct mbuf * bp)
{
mbuf_Free(bp);
}
static void
FsmRecvResetReq(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
{
(*fp->fn->RecvResetReq)(fp);
/*
* All sendable compressed packets are queued in the PRI_NORMAL modem
* output queue.... dump 'em to the priority queue so that they arrive
* at the peer before our ResetAck.
*/
link_SequenceQueue(fp->link);
fsm_Output(fp, CODE_RESETACK, lhp->id, NULL, 0);
mbuf_Free(bp);
}
static void
FsmRecvResetAck(struct fsm *fp, struct fsmheader *lhp, struct mbuf *bp)
{
(*fp->fn->RecvResetAck)(fp, lhp->id);
mbuf_Free(bp);
}
void
fsm_Input(struct fsm *fp, struct mbuf *bp)
{
int len;
struct fsmheader *lhp;
const struct fsmcodedesc *codep;
len = mbuf_Length(bp);
if (len < sizeof(struct fsmheader)) {
mbuf_Free(bp);
return;
}
lhp = (struct fsmheader *) MBUF_CTOP(bp);
if (lhp->code < fp->min_code || lhp->code > fp->max_code ||
lhp->code > sizeof FsmCodes / sizeof *FsmCodes) {
/*
* Use a private id. This is really a response-type packet, but we
* MUST send a unique id for each REQ....
*/
static u_char id;
fsm_Output(fp, CODE_CODEREJ, id++, MBUF_CTOP(bp), bp->cnt);
mbuf_Free(bp);
return;
}
bp->offset += sizeof(struct fsmheader);
bp->cnt -= sizeof(struct fsmheader);
codep = FsmCodes + lhp->code - 1;
if (lhp->id != fp->reqid && codep->check_reqid &&
Enabled(fp->bundle, OPT_IDCHECK)) {
log_Printf(fp->LogLevel, "%s: Recv%s(%d), dropped (expected %d)\n",
fp->link->name, codep->name, lhp->id, fp->reqid);
return;
}
log_Printf(fp->LogLevel, "%s: Recv%s(%d) state = %s\n",
fp->link->name, codep->name, lhp->id, State2Nam(fp->state));
if (log_IsKept(LogDEBUG))
mbuf_Log();
if (codep->inc_reqid && (lhp->id == fp->reqid ||
(!Enabled(fp->bundle, OPT_IDCHECK) && codep->check_reqid)))
fp->reqid++; /* That's the end of that ``exchange''.... */
(*codep->recv)(fp, lhp, bp);
if (log_IsKept(LogDEBUG))
mbuf_Log();
}
void
fsm_NullRecvResetReq(struct fsm *fp)
{
log_Printf(fp->LogLevel, "%s: Oops - received unexpected reset req\n",
fp->link->name);
}
void
fsm_NullRecvResetAck(struct fsm *fp, u_char id)
{
log_Printf(fp->LogLevel, "%s: Oops - received unexpected reset ack\n",
fp->link->name);
}
void
fsm_Reopen(struct fsm *fp)
{
if (fp->state == ST_OPENED) {
(*fp->fn->LayerDown)(fp);
FsmInitRestartCounter(fp, FSM_REQ_TIMER);
FsmSendConfigReq(fp);
NewState(fp, ST_REQSENT);
(*fp->parent->LayerDown)(fp->parent->object, fp);
}
}
void
fsm2initial(struct fsm *fp)
{
timer_Stop(&fp->FsmTimer);
timer_Stop(&fp->OpenTimer);
timer_Stop(&fp->StoppedTimer);
if (fp->state == ST_STOPPED)
fsm_Close(fp);
if (fp->state > ST_INITIAL)
fsm_Down(fp);
if (fp->state > ST_INITIAL)
fsm_Close(fp);
}
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