Oberon/ETH Oberon/2.3.7/PPPLCP.Mod
< Oberon | ETH Oberon
(* ETH Oberon, Copyright 1990-2003 Computer Systems Institute, ETH Zurich, CH-8092 Zurich.
Refer to the license.txt file provided with this distribution. *)
MODULE PPPLCP; (** non-portable *)
(* $VCS 4, Edgar@EdgarSchwarz.de, 9 May :0, 1:20:35 $
$Log$
$ 4, Edgar@EdgarSchwarz.de, 9 May :0, 1:20:35
more debug info with auth stuff
$ 3, Edgar@EdgarSchwarz.de, 25 Apr :0, 10:47:30
more debug info, drop Identification code
$ 2, Edgar.Schwarz@z.zgs.de, 5 Sep 99, 13:49:32
minimal length for echo request set to 4 bytes
$ 1, Edgar.Schwarz@z.zgs.de, 28 Feb 99, 22:19:22
version for PPP 1.0.0
*)
IMPORT
FSM := PPPFSM, PAP := PPPPAP, HDLC := PPPHDLC, T := PPPTools,
Debug := PPPDebug, SYSTEM;
CONST
(* Protocol Constants *)
DefMRU = HDLC.MTU; MinMRU = 128; MaxMRU = HDLC.MTU;
WarnLoops = 10; (* Warn about loop-backs this often *)
LCP*=-03FDFH; (* =0C021H *)
(* Configure Information Options *)
Illegal0 = 0; (*es some PPP implementations send that *)
MRU = 1; (* Maximum Receive Unit *)
AsyncMap = 2; (* Async Control Character Map *)
AuthType = 3; (* Authentication Protocol *)
Quality = 4; (* Quality Protocol *)
MagicNumber = 5;
(* = 6; *) (*es RESERVED*)
PCompression = 7; (* Protocol Field Compression *)
ACCompression = 8; (* Address And Control Field Compression *)
(*es extensions from RFC1570 Jan 1994 *)
(* = 9; *) (*es FCSAlternatives *)
(* = 10; *) (*es Self Describing Padding *)
(* = 13; *) (*es Callback *)
(* = 15; *) (*es Compound Frames *)
LCPConf17 = 17; (*es* ? *)
LCPConf19 = 19; (*es* ? *)
(* LCP codes *)
ProtocolRej = 8; EchoReq = 9; EchoReply = 10; DiscardReq = 11;
(*es*)Identification = 12; TimeRemaining = 13; (**)
(* Options Index *)
Passive* = FSM.Passive; (* Don't die if we get no response *)
Silent* = FSM.Silent; (* Wait for the other end to start first *)
NegMRU* = 8; NegAsyncMap* = 9; NegUPap* = 10;
(* Negotiate MRU, Async Map, User/Password *)
NegChap = 11; NegMagicNumber* = 12; NegPComp = 13;
(* Crypt-Auth, MagicNumber, PCompression *)
NegACComp = 14; NegLqr = 15;
(* AC-Compr., Link Quality Reports *)
(* Length of the Configuration Options *)
VoidLen = 2; ShortLen = 4; ChapLen = 5; LongLen = 6; LqrLen = 8;
(* = Type (1 Byte) + Length (1 Byte) + Data *)
TYPE
Options*=RECORD
O*: SET (* Bits defined by Options Index *);
MRU*:INTEGER; (* Max. Receive Unit *)
MagicNumb*:LONGINT; NumLoops*:INTEGER; (* Magic Number Stuff *)
AsyncMap*:SET;
END;
LCPfsm*=POINTER TO LCPfsmDesc;
LCPfsmDesc=RECORD (FSM.FSMDesc)
wo*, go(*es*)*(*-*),ao*, ho(*es*)*(*-*): Options;
(* WantOptions, GotOptions, AllowOptions, HisOptions *)
END;
VAR
(* Upcalls to PPP *)
PPPHandleLCPUp*: PROCEDURE (U:HDLC.PPPUnit);
PPPHandleLCPDown*: PROCEDURE (U:HDLC.PPPUnit);
PPPHandleProtRej*: PROCEDURE (U:HDLC.PPPUnit; prot:INTEGER);
(* Open - LCP can come up *)
PROCEDURE Open* (f: LCPfsm);
BEGIN f.Flags:=f.wo.O*{Passive, Silent};
FSM.Open(f);
END Open;
(* Close - Take LCP down *)
PROCEDURE Close* (f: LCPfsm);
BEGIN
IF (f.State=FSM.Stopped) & (f.Flags*{Passive, Silent} # {}) THEN f.State:=FSM.Closed
ELSE FSM.Close(f)
END
END Close;
(* LowerUp - The Lower Layer is Up *)
PROCEDURE LowerUp* (f: LCPfsm);
BEGIN
f.HDLCConfig.MTU:=DefMRU; f.HDLCConfig.SendAsyncMap:={0..31};
(* Send Configuration *)
f.HDLCConfig.MRU:=DefMRU; (* Receive Configuration *)
f.ao.AsyncMap:={};
FSM.LowerUp(f)
END LowerUp;
(* LowerDown - The Lower Layer is Down *)
PROCEDURE LowerDown* (f: LCPfsm);
BEGIN FSM.LowerDown(f) END LowerDown;
(* Input - New LCP Packet *)
PROCEDURE Input* (f: LCPfsm; VAR p: ARRAY OF CHAR; pos, len:INTEGER);
BEGIN FSM.Input(f, p, pos, len); END Input;
(* SendProtRej - Send a Protocol Reject *)
PROCEDURE SendProtRej* (f: LCPfsm; VAR p: ARRAY OF CHAR; pos, len:INTEGER);
BEGIN
INC(f.ID); FSM.SendData(f, ProtocolRej, f.ID, p, pos+2, len-2);
END SendProtRej;
(* ResetCI - Reset The Configuration Information *)
PROCEDURE *ResetCI (f: FSM.FSM);
BEGIN
IF HDLC.debug THEN Debug.String("reset CI"); Debug.Ln; END;
WITH f:LCPfsm DO
f.wo.MagicNumb:=T.Magic(); f.wo.NumLoops:=0; (* WantOptions *)
f.go:=f.wo; (* GotOptions := WantOptions *)
f.HDLCConfig.MTU:=HDLC.MTU (* Max. Transmit Unit *)
END
END ResetCI;
(* CILen - Returns Length of the Conf. Inf. *)
PROCEDURE *CILen (f: FSM.FSM): INTEGER;
VAR i: INTEGER;
BEGIN i:=0;
WITH f:LCPfsm DO
IF (NegMRU IN f.go.O) THEN INC(i, ShortLen); END;
IF (NegAsyncMap IN f.go.O) THEN INC(i, LongLen); END;
IF (NegMagicNumber IN f.go.O) THEN INC(i, LongLen); END;
(* To update if more Options supported *)
END;
RETURN i
END CILen;
(* AddCI - Add our desired Conf. Inf. to a packet (at pos) *)
PROCEDURE *AddCI (f: FSM.FSM; VAR p: ARRAY OF CHAR; pos: INTEGER; VAR len: INTEGER);
BEGIN len:=0;
IF HDLC.debug THEN FSM.OutLog("LCP.AddCI", "", f); END;
WITH f:LCPfsm DO
IF (NegMRU IN f.go.O) THEN INC(len, ShortLen); IF HDLC.debug THEN Debug.String("MRU "); END;
p[pos]:=CHR(MRU); p[pos+1]:=CHR(ShortLen); T.PutInt(f.go.MRU, p, pos+2); INC(pos, ShortLen);
END;
IF (NegAsyncMap IN f.go.O) THEN INC(len, LongLen); IF HDLC.debug THEN Debug.String("AsyncMap "); END;
p[pos]:=CHR(AsyncMap); p[pos+1]:=CHR(LongLen); T.PutSet(f.go.AsyncMap, p, pos+2); INC(pos, LongLen);
END;
IF (NegMagicNumber IN f.go.O) THEN INC(len, LongLen); IF HDLC.debug THEN Debug.String("MagicNumber "); END;
p[pos]:=CHR(MagicNumber); p[pos+1]:=CHR(LongLen);
T.PutLong(f.go.MagicNumb, p, pos+2); INC(pos, LongLen)
END
END; (* To update if more Options supported *)
IF HDLC.debug THEN Debug.Ln; Debug.Ln; END
END AddCI;
(* AckCI - An Ack Packet has been received as answer to our req *)
PROCEDURE *AckCI (f: FSM.FSM; VAR p: ARRAY OF CHAR; pos, len: INTEGER): BOOLEAN;
VAR b:BOOLEAN;
BEGIN b:=TRUE;
WITH f:LCPfsm DO (* No changes to our former req are allowed, otherwise the ack is bad *)
IF (NegMRU IN f.go.O) THEN
b:= b & (len>=ShortLen) & (ORD(p[pos])=MRU) & (ORD(p[pos+1])=ShortLen) & (T.GetInt(p, pos+2)=f.go.MRU);
DEC(len, ShortLen); INC(pos, ShortLen);
END;
IF (NegAsyncMap IN f.go.O) THEN
b:=b & (len>=LongLen) & (ORD(p[pos])=AsyncMap) & (ORD(p[pos+1])=LongLen)
& (T.GetSet(p, pos+2)=f.go.AsyncMap);
DEC(len, LongLen); INC(pos, LongLen);
END;
IF (NegMagicNumber IN f.go.O) THEN
b:=b & (len>=LongLen) & (ORD(p[pos])=MagicNumber) & (ORD(p[pos+1])=LongLen)
& (T.GetLong(p, pos+2)=f.go.MagicNumb);
DEC(len, LongLen); INC(pos, LongLen);
END;
(* To update if more Options supported *)
b:=b & (len=0);
IF HDLC.debug & ~b THEN Debug.String("Received bad Ack!!"); Debug.Ln END;
RETURN b
END
END AckCI;
(* NakCI - A Nak Packet has been received as answer to our req *)
PROCEDURE *NakCI (f: FSM.FSM; VAR p: ARRAY OF CHAR; pos, len: INTEGER): BOOLEAN;
VAR no, try: Options; (* no: Options with Naks, try: Options we try next time *)
x, type, size:INTEGER; loopedback, b:BOOLEAN;
BEGIN
WITH f:LCPfsm DO (* same order as we sent it, but only the nak'd ones *)
no.O:={}; try.O:=f.go.O;
IF (NegMRU IN f.go.O) & (len>=ShortLen) & (ORD(p[pos])=MRU) & (ORD(p[pos+1])=ShortLen) THEN
x:=T.GetInt(p, pos+2); IF (x<DefMRU) THEN no.MRU:=x; try.MRU:=x; END; (* Accept New Option *)
INCL(no.O, NegMRU); DEC(len, ShortLen); INC(pos, ShortLen);
END;
IF (NegAsyncMap IN f.go.O) & (len>=LongLen) & (ORD(p[pos])=AsyncMap) & (ORD(p[pos+1])=LongLen) THEN
INCL(no.O, NegAsyncMap); try.AsyncMap:=try.AsyncMap + T.GetSet(p, pos+2);
DEC(len, LongLen); INC(pos, LongLen); (* Include New Chars (our receive side)*)
END;
IF (NegMagicNumber IN f.go.O) & (len>=LongLen) & (ORD(p[pos])=MagicNumber) & (ORD(p[pos+1])=LongLen) THEN
INCL(no.O, NegMagicNumber); try.MagicNumb:=T.Magic(); INC(try.NumLoops); loopedback:=TRUE;
DEC(len, LongLen); INC(pos, LongLen);
END;
b:=TRUE; (* there may be remaining options , but no changes possible ! (Just checking if Nak is ok) *)
WHILE b & (len>VoidLen) DO
type:=ORD(p[pos]); size:=ORD(p[pos+1]);
CASE type OF
MRU: b:=((size=ShortLen) & ~(NegMRU IN f.go.O) & ~(NegMRU IN no.O));
| AsyncMap: b:=((size=LongLen) & ~(NegAsyncMap IN f.go.O) & ~(NegAsyncMap IN no.O));
| MagicNumber: b:=((size=LongLen) & ~(NegMagicNumber IN f.go.O) & ~(NegMagicNumber IN no.O));
| PCompression, ACCompression: b:=(size=VoidLen);
| Quality: b:=(size=LqrLen);
| AuthType: b:=((size=ChapLen) OR (size=ShortLen));
ELSE (* probably an unknown Configuration Option *)
END;
INC(pos, size);
END;
b:=b & (len=0);
IF b & (f.State#FSM.Opened) THEN f.go:=try; (* Update State *)
IF loopedback & ((try.NumLoops MOD WarnLoops) = 0) THEN
Debug.String("This line could be looped back!!"); Debug.Ln;
END;
END;
RETURN b
END
END NakCI;
(* RejCI - A Reject Packet has been received as answer to our req*)
PROCEDURE *RejCI (f: FSM.FSM; VAR p: ARRAY OF CHAR; pos, len: INTEGER): BOOLEAN;
VAR try: Options; (* try: Option to request next time *)
BEGIN
WITH f:LCPfsm DO (* Look which options were rejected. Same order and same value! Otherwise a bad packet. *)
try:=f.go;
IF (NegMRU IN f.go.O) & (len>=ShortLen) & (ORD(p[pos])=MRU) & (ORD(p[pos+1])=ShortLen)
& (T.GetInt(p, pos+2)=f.go.MRU) THEN
DEC(len, ShortLen); INC(pos, ShortLen); EXCL(try.O, NegMRU);
END;
IF (NegAsyncMap IN f.go.O) & (len>=LongLen) & (ORD(p[pos])=AsyncMap) & (ORD(p[pos+1])=LongLen)
& (T.GetSet(p, pos+2)=f.go.AsyncMap) THEN
DEC(len, LongLen); INC(pos, LongLen); EXCL(try.O, NegAsyncMap);
END;
IF (NegMagicNumber IN f.go.O) & (len>=LongLen) & (ORD(p[pos])=MagicNumber) & (ORD(p[pos+1])=LongLen)
& (T.GetLong(p, pos+2)=f.go.MagicNumb) THEN
DEC(len, LongLen); INC(pos, LongLen); EXCL(try.O, NegMagicNumber);
END;
IF len#0 THEN IF HDLC.debug THEN Debug.String("Received bad Reject !"); END; RETURN FALSE
ELSE IF f.State#FSM.Opened THEN f.go:=try; END; (* Update the Options *)
RETURN TRUE
END
END
END RejCI;
(* ReqCI - Conf. Request has arrived: Check the requested CIs and send
appropriate response
Returns: ConfigureAck, ConfigureNak or ConfigureReject and modified
packet (p, pos, length in len)
If Mode is true, always send Reject, never Nak *)
PROCEDURE ReqCI (f: FSM.FSM; VAR p: ARRAY OF CHAR;
VAR pos, len: INTEGER; Mode: BOOLEAN): SHORTINT;
CONST Ack=0; Nak=1; Rej=2; RejAll=3;
VAR type, size, posp, posw, lenp, x: INTEGER;
y: LONGINT; eo, s: SET; (* eo: Error-Options: Options to Nak/Rej *)
status: SHORTINT; (* Ack: Can Ack, Nak: Should Nak, Rej: reject of
some options needed, RejAll: serious reject: rej whole packet *)
BEGIN eo:={};
(* Two steps:
First find out if packet can be accepted, or have to be naked or rejected
Second step: If nak, then modify (better proposals),
if rej then send back same packet *)
WITH f:LCPfsm DO
lenp:=len; posp:=pos; status:=Ack; f.ho.O:={};
WHILE (status#RejAll) & (lenp>=VoidLen) DO
size:=ORD(p[posp+1]);
IF (size<VoidLen) OR (size>lenp) THEN
ELSE type:=ORD(p[posp]);
CASE type OF
(*es reject 0 if a bad peer sends it *)
Illegal0: status:=Rej; INCL(eo, Illegal0);
IF HDLC.debug THEN Debug.String("RejIllegal0"); END;
| (**) MRU: INCL(f.ho.O, NegMRU);
IF (NegMRU IN f.ao.O) & (size=ShortLen) THEN
x:=T.GetInt(p, posp+2); f.ho.MRU:=x;
IF (x<MinMRU) THEN
(* Minimal size needed: we have to change ->NAK *)
INCL(eo, MRU);
IF status=Ack THEN status:=Nak; END;
END;
ELSE
IF HDLC.debug THEN Debug.String("RejMRU"); END;
status:=Rej; INCL(eo, MRU);
END;
| AsyncMap: INCL(f.ho.O, NegAsyncMap);
IF (NegAsyncMap IN f.ao.O) & (size=LongLen) THEN
s:=T.GetSet(p, posp+2); f.ho.AsyncMap:=s;
IF (f.ao.AsyncMap * (s/{0..31} (* = ~s *)) # {} ) THEN
(* at least our options needed *)
INCL(eo, AsyncMap);
IF status=Ack THEN status:=Nak; END;
END;
ELSE
IF HDLC.debug THEN Debug.String("RejAsyncMap"); END;
status:=Rej; INCL(eo, AsyncMap);
END;
| MagicNumber: INCL(f.ho.O, NegMagicNumber);
IF (NegMagicNumber IN f.ao.O) & (size=LongLen) THEN
y:=T.GetLong(p, posp+2); f.ho.MagicNumb:=y;
IF(NegMagicNumber IN f.go.O)&(y=f.go.MagicNumb)THEN
(* MagicNumber MUST be different *)
INCL(eo, MagicNumber);
IF status=Ack THEN status:=Nak; END;
END;
ELSE
IF HDLC.debug THEN Debug.String("RejMagic"); END;
status:=Rej; INCL(eo, MagicNumber);
END;
| AuthType:
(*es*) IF HDLC.debug THEN
Debug.String("LCP.ReCI: AuthType"); Debug.Ln;
(**) END;
IF size>=ShortLen THEN x := T.GetInt(p, posp+2);
(*es*) IF HDLC.debug THEN
Debug.String("x ="); Debug.Int(x, 3); Debug.Ln;
(**) END;
IF x = PAP.PAPProt THEN (*UPap *)
IF (NegUPap IN f.ao.O) & (size >= ShortLen) THEN
(* dm:1.10.96: size = ShortLen *)
INCL(f.ho.O, NegUPap);
(*es*) IF HDLC.debug THEN
Debug.String("LCP.ReCI: NegUPap added to his options"); Debug.Ln;
(**) END;
ELSE
(*es*) IF HDLC.debug THEN
Debug.String("Rej: NegUPap"); Debug.Int(size,5); Debug.Int(ShortLen,5); Debug.Ln;
(**) END;
status := Rej; INCL(eo, AuthType);
END
ELSE
(*es*) Debug.String("LCP.ReCI: AuthType CHAP not supported"); Debug.Ln;
INCL(f.ho.O, NegChap); INCL(eo, AuthType);
IF status = Ack THEN status := Nak END;
END
ELSE
IF HDLC.debug THEN Debug.String("RejAuth"); END;
status := Rej; INCL(eo, AuthType);
END;
Debug.Ln
| PCompression: INCL(f.ho.O, NegPComp); status:=Rej;
IF HDLC.debug THEN Debug.String("RejPCComp"); END;
INCL(eo, PCompression); (* not supported *)
| ACCompression: INCL(f.ho.O, NegACComp); status:=Rej;
IF HDLC.debug THEN Debug.String("RejACComp"); END;
INCL(eo, ACCompression); (* not supported *)
| Quality: INCL(f.ho.O, NegLqr); status:=Rej;
IF HDLC.debug THEN Debug.String("RejQuality"); END;
INCL(eo, Quality); (* not supported *)
(*es es fehlt weitere Info, einfach mal ablehnen *)
| LCPConf17: status:=Rej;
INCL(eo, LCPConf17); (* not supported *)
IF HDLC.debug THEN Debug.String("RejLCPConf17"); END;
| LCPConf19: status:=Rej;
IF HDLC.debug THEN Debug.String("RejLCPConf19"); END;
INCL(eo, LCPConf19); (* not supported *)
(**)
ELSE
status:=Rej; (* unknown Type ->reject *)
Debug.String("unknown type");
(*es*)Debug.Int(type, 5); (**) Debug.Ln;
END;
DEC(lenp, size); INC(posp, size);
END;
END;
IF lenp # 0 THEN status:=RejAll; END;
IF (status=RejAll) THEN RETURN FSM.ConfRej;(* len, pos are ok *)
ELSIF (status=Ack) THEN RETURN FSM.ConfAck; (* len, pos are ok *)
ELSE IF Mode THEN status:=Rej; END;
(* little hack *)
IF status = Rej THEN EXCL(eo, AuthType) END;
lenp:=len; posp:=pos; posw:=pos;
WHILE lenp#0 DO
type:=ORD(p[posp]); size:=ORD(p[posp+1]);
IF (type IN eo) THEN
IF status=Nak THEN (* make better proposals *)
CASE type OF
MRU: T.PutInt(MinMRU, p, posp+2);
(* write over old values *)
| AsyncMap:
T.PutSet(f.ao.AsyncMap+ f.ho.AsyncMap, p, posp+2);
| MagicNumber: T.PutLong(T.Magic(), p, posp+2);
|AuthType: T.PutInt(PAP.PAPProt, p, posp+2);
ELSE
END
END;
IF posw # posp THEN T.CopyString(p, posp, posw, size); END;
INC(posw,size); (* 'shift' it together *)
END;
INC(posp, size); DEC(lenp, size);
END;
len:=posw-pos;
IF status=Rej
THEN RETURN FSM.ConfRej;
ELSE RETURN FSM.ConfNak; END;
END
END;
END ReqCI;
(* Up - LCP is ready *)
PROCEDURE *Up (f: FSM.FSM);
VAR x:INTEGER; s:SET;
BEGIN
WITH f: LCPfsm DO
(* Configure our HDLC: Receive: MTU: Take WantOption, but not bigger than our Allow Option! *)
IF (NegMRU IN f.ho.O) THEN x:=f.ho.MRU; ELSE x:=HDLC.MTU; END;
IF x>f.ao.MRU THEN x:=f.ao.MRU; END;
f.HDLCConfig.MTU:=x;
IF (NegAsyncMap IN f.ho.O) THEN s:=f.ho.AsyncMap; ELSE s:={0..31}; END;
f.HDLCConfig.SendAsyncMap:=s;
(* Receive Config *)
IF (NegMRU IN f.wo.O) THEN x:=f.go.MRU ELSE x:=HDLC.MTU; END;
f.HDLCConfig.MRU:=x;
PPPHandleLCPUp(f.HDLCConfig); (* PPP will inform other protocols *)
END;
END Up;
(* Down - LCP has to close *)
PROCEDURE *Down (f: FSM.FSM);
BEGIN
PPPHandleLCPDown(f.HDLCConfig); (* PPP will inform other protocols *)
f.HDLCConfig.MTU:=HDLC.MTU; f.HDLCConfig.SendAsyncMap:={0..31};
f.HDLCConfig.MRU:=HDLC.MTU;
END Down;
(* RecProtRej - Protocol Reject received *)
PROCEDURE *RecProtRej(f: FSM.FSM; VAR p: ARRAY OF CHAR; pos, len:INTEGER);
VAR prot:INTEGER;
BEGIN
IF len>1 THEN
prot:=T.GetInt(p, pos); Debug.String(" Protocol rejected: "); Debug.Int(prot, 10); Debug.Ln;
IF f.State#FSM.Opened THEN Debug.String(" Protocol reject discarded "); Debug.Ln;
ELSE PPPHandleProtRej(f.HDLCConfig, prot); (* PPP will inform protocols *)
END
ELSE Debug.String("Short ProtReject received"); Debug.Ln
END
END RecProtRej;
(* To implement if we intend to send Echo-Requests
PROCEDURE RecEchoReply(f:FSM.FSM; id:SHORTINT; VAR p:ARRAY OF CHAR; pos, len:LONGINT); BEGIN END RecEchoReply;
*)
(* ExtCode - Handle LCP-Codes *)
PROCEDURE *ExtCode(f: FSM.FSM; code, id: SHORTINT; VAR p: ARRAY OF CHAR; pos, len:INTEGER): BOOLEAN;
BEGIN
WITH f:LCPfsm DO
CASE code OF
ProtocolRej: RecProtRej(f, p, pos, len); RETURN TRUE
(** es, 4 Bytes should be enough for a echo request without data (magic only) *)
| EchoReq: IF len<4 THEN len:=4; END; T.PutLong(f.go.MagicNumb, p, pos);
(** | EchoReq: IF len<6 THEN len:=6; END; T.PutLong(f.go.MagicNumb, p, pos); **)
FSM.SendData(f, EchoReply, id, p, pos, len); RETURN TRUE
| EchoReply: (* RecEchoReply(f, id, p, pos, len); To implement if we intend to send Echo-Requests *) RETURN TRUE
| DiscardReq: RETURN TRUE
(* test code for a problem of Jose Francisco <jfglez@teleline.es>, 05.10.1999, es *)
| Identification: (* a peer seems to choke on CodeRej, so just try to drop it. *) RETURN TRUE
ELSE RETURN FALSE
END
END
END ExtCode;
(* Initialisation LCP*)
PROCEDURE Init* (VAR f:LCPfsm; wo, ao:Options; C:HDLC.PPPUnit);
BEGIN
NEW(f); f.Protocol:=LCP; f.ProtoName:="LCP"; (* LCP Protocol *)
f.ResetCI:=ResetCI; f.CILen:=CILen; f.AddCI:=AddCI; f.AckCI:=AckCI; f.NakCI:=NakCI; f.RejCI:=RejCI;
f.ReqCI:=ReqCI; f.Up:=Up; f.Down:=Down; f.ExtCode:=ExtCode; f.HDLCConfig:=C;
FSM.Init(f);
f.wo:=wo; f.ao:=ao
END Init;
END PPPLCP.