/* fsm.h - {Link, IP} Control Protocol Finite State Machine header *//* Copyright 1995 Wind River Systems, Inc. *//* * 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. *//*modification history--------------------01a,16jan95,dzb  WRS-ize.*/#ifndef __INCfsmh#define __INCfsmh#ifdef  __cplusplusextern "C" {#endif/* * Packet header = Code, id, length. */#define HEADERLEN	(sizeof (u_char) + sizeof (u_char) + sizeof (u_short))/* *  CP (LCP, IPCP, etc.) codes. */#define CONFREQ		1	/* Configuration Request */#define CONFACK		2	/* Configuration Ack */#define CONFNAK		3	/* Configuration Nak */#define CONFREJ		4	/* Configuration Reject */#define TERMREQ		5	/* Termination Request */#define TERMACK		6	/* Termination Ack */#define CODEREJ		7	/* Code Reject *//* * Each FSM is described by a fsm_callbacks and a fsm structure. */typedef struct fsm_callbacks {    void (*resetci)();		/* Reset our Configuration Information */    int  (*cilen)();		/* Length of our Configuration Information */    void (*addci)();		/* Add our Configuration Information */    int  (*ackci)();		/* ACK our Configuration Information */    int  (*nakci)();		/* NAK our Configuration Information */    int  (*rejci)();		/* Reject our Configuration Information */    int  (*reqci)();		/* Request peer's Configuration Information */    void (*up)();		/* Called when fsm reaches OPENED state */    void (*down)();		/* Called when fsm leaves OPENED state */    void (*starting)();		/* Called when we want the lower layer */    void (*finished)();		/* Called when we don't want the lower layer */    void (*protreject)();	/* Called when Protocol-Reject received */    void (*retransmit)();	/* Retransmission is necessary */    int  (*extcode)();		/* Called when unknown code received */    char *proto_name;		/* String name for protocol (for messages) */} fsm_callbacks;typedef struct fsm {    int unit;			/* Interface unit number */    int protocol;		/* Data Link Layer Protocol field value */    int state;			/* State */    int flags;			/* Contains option bits */    u_char id;			/* Current id */    u_char reqid;		/* Current request id */    int timeouttime;		/* Timeout time in milliseconds */    int maxconfreqtransmits;	/* Maximum Configure-Request transmissions */    int retransmits;		/* Number of retransmissions left */    int maxtermtransmits;	/* Maximum Terminate-Request transmissions */    int nakloops;		/* Number of nak loops since last ack */    int maxnakloops;		/* Maximum number of nak loops tolerated */    fsm_callbacks *callbacks;	/* Callback routines */} fsm;/* * Link states. */#define INITIAL		0	/* Down, hasn't been opened */#define STARTING	1	/* Down, been opened */#define CLOSED		2	/* Up, hasn't been opened */#define STOPPED		3	/* Open, waiting for down event */#define CLOSING		4	/* Terminating the connection, not open */#define STOPPING	5	/* Terminating, but open */#define REQSENT		6	/* We've sent a Config Request */#define ACKRCVD		7	/* We've received a Config Ack */#define ACKSENT		8	/* We've sent a Config Ack */#define OPENED		9	/* Connection available *//* * Flags - indicate options controlling FSM operation */#define OPT_PASSIVE	1	/* Don't die if we don't get a response */#define OPT_RESTART	2	/* Treat 2nd OPEN as DOWN, UP */#define OPT_SILENT	4	/* Wait for peer to speak first *//* * Timeouts. */#define DEFTIMEOUT	3	/* Timeout time in seconds */#define DEFMAXTERMREQS	2	/* Maximum Terminate-Request transmissions */#define DEFMAXCONFREQS	10	/* Maximum Configure-Request transmissions */#define DEFMAXNAKLOOPS	10	/* Maximum number of nak loops *//* * Prototypes */extern void fsm_init __ARGS((fsm *));extern void fsm_lowerup __ARGS((fsm *));extern void fsm_lowerdown __ARGS((fsm *));extern void fsm_open __ARGS((fsm *));extern void fsm_close __ARGS((fsm *));extern void fsm_input __ARGS((fsm *, u_char *, int));extern void fsm_protreject __ARGS((fsm *));extern void fsm_sdata __ARGS((fsm *, int, int, u_char *, int));#ifdef  __cplusplus}#endif#endif /* __INCfsmh */