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/*
* fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
*
* 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.
*/
/*
* 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 */
#define PROTREJ 8 /* Protocol Reject */
#define ECHOREQ 9 /* Echo Request */
#define ECHOREP 10 /* Echo Reply */
#define DISCREQ 11 /* Discard Request */
#define KEEPALIVE 12 /* Keepalive */
/*
* 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 */
void (*nakci)(); /* NAK our Configuration Information */
void (*rejci)(); /* Reject our Configuration Information */
u_char (*reqci)(); /* Request peer's Configuration Information */
void (*up)(); /* Called when fsm reaches OPEN state */
void (*down)(); /* Called when fsm leaves OPEN state */
void (*closed)(); /* Called when fsm reaches CLOSED state */
void (*protreject)(); /* Called when Protocol-Reject received */
void (*retransmit)(); /* Retransmission is necessary */
} fsm_callbacks;
typedef struct fsm {
int unit; /* Interface unit number */
u_short protocol; /* Data Link Layer Protocol field value */
int state; /* State */
int flags; /* Flags */
u_char id; /* Current id */
u_char reqid; /* Current request id */
int timeouttime; /* Timeout time in milliseconds */
int retransmits; /* Number of retransmissions */
int maxtermtransmits; /* Maximum Terminate-Request transmissions */
int nakloops; /* Number of nak loops since last timeout */
int maxnakloops; /* Maximum number of nak loops tolerated */
fsm_callbacks *callbacks; /* Callback routines */
} fsm;
/*
* Link states.
*/
#define CLOSED 1 /* Connection closed */
#define LISTEN 2 /* Listening for a Config Request */
#define REQSENT 3 /* We've sent a Config Request */
#define ACKSENT 4 /* We've sent a Config Ack */
#define ACKRCVD 5 /* We've received a Config Ack */
#define OPEN 6 /* Connection open */
#define TERMSENT 7 /* We've sent a Terminate Request */
/*
* Flags.
*/
#define LOWERUP 1 /* The lower level is UP */
#define AOPENDING 2 /* Active Open pending timeout of request */
#define POPENDING 4 /* Passive Open pending timeout of request */
/*
* Timeouts.
*/
#define DEFTIMEOUT 3 /* Timeout time in seconds */
#define DEFMAXTERMTRANSMITS 10 /* Maximum Terminate-Request transmissions */
#define DEFMAXNAKLOOPS 10 /* Maximum number of nak loops */
void fsm_init();
void fsm_activeopen();
void fsm_passiveopen();
void fsm_close();
void fsm_lowerup();
void fsm_lowerdown();
void fsm_protreject();
void fsm_input();
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.