* 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.
* $Id: fsm.h,v 1.1 1993/11/11 03:54:25 paulus Exp $
* 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 */
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) */
int unit
; /* Interface unit number */
int protocol
; /* Data Link Layer Protocol field value */
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 */
#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 */
#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 */
void fsm_init
__ARGS((fsm
*));
void fsm_lowerup
__ARGS((fsm
*));
void fsm_lowerdown
__ARGS((fsm
*));
void fsm_open
__ARGS((fsm
*));
void fsm_close
__ARGS((fsm
*));
void fsm_input
__ARGS((fsm
*, u_char
*, int));
void fsm_protreject
__ARGS((fsm
*));
void fsm_sdata
__ARGS((fsm
*, int, int, u_char
*, int));
extern int peer_mru
[]; /* currently negotiated peer MRU (per unit) */