* fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
* Copyright (c) 1989 Carnegie Mellon University.
* 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 */
int unit
; /* Interface unit number */
u_short protocol
; /* Data Link Layer Protocol field value */
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 */
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 */
#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 */
#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 */
#define DEFTIMEOUT 3 /* Timeout time in seconds */
#define DEFMAXTERMTRANSMITS 10 /* Maximum Terminate-Request transmissions */
#define DEFMAXCONFIGREQS 10 /* Maximum Configure-Request transmissions */
#define DEFMAXNAKLOOPS 10 /* Maximum number of nak loops */
void fsm_init
__ARGS((fsm
*));
void fsm_activeopen
__ARGS((fsm
*));
void fsm_passiveopen
__ARGS((fsm
*));
void fsm_close
__ARGS((fsm
*));
void fsm_lowerup
__ARGS((fsm
*));
void fsm_lowerdown
__ARGS((fsm
*));
void fsm_protreject
__ARGS((fsm
*));
void fsm_input
__ARGS((fsm
*, u_char
*, int));
void fsm_sdata
__ARGS((fsm
*, int, int, u_char
*, int));