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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();
-