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129 lines
4.6 KiB
C
129 lines
4.6 KiB
C
/*
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* fsm.h - {Link, IP} Control Protocol Finite State Machine definitions.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: fsm.h,v 1.5 1995/05/19 03:17:35 paulus Exp $
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*/
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/*
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* Packet header = Code, id, length.
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*/
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#define HEADERLEN (sizeof (u_char) + sizeof (u_char) + sizeof (u_short))
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/*
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* CP (LCP, IPCP, etc.) codes.
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*/
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#define CONFREQ 1 /* Configuration Request */
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#define CONFACK 2 /* Configuration Ack */
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#define CONFNAK 3 /* Configuration Nak */
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#define CONFREJ 4 /* Configuration Reject */
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#define TERMREQ 5 /* Termination Request */
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#define TERMACK 6 /* Termination Ack */
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#define CODEREJ 7 /* Code Reject */
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/*
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* Each FSM is described by a fsm_callbacks and a fsm structure.
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*/
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typedef struct fsm_callbacks {
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void (*resetci)(); /* Reset our Configuration Information */
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int (*cilen)(); /* Length of our Configuration Information */
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void (*addci)(); /* Add our Configuration Information */
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int (*ackci)(); /* ACK our Configuration Information */
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int (*nakci)(); /* NAK our Configuration Information */
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int (*rejci)(); /* Reject our Configuration Information */
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int (*reqci)(); /* Request peer's Configuration Information */
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void (*up)(); /* Called when fsm reaches OPENED state */
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void (*down)(); /* Called when fsm leaves OPENED state */
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void (*starting)(); /* Called when we want the lower layer */
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void (*finished)(); /* Called when we don't want the lower layer */
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void (*protreject)(); /* Called when Protocol-Reject received */
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void (*retransmit)(); /* Retransmission is necessary */
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int (*extcode)(); /* Called when unknown code received */
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char *proto_name; /* String name for protocol (for messages) */
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} fsm_callbacks;
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typedef struct fsm {
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int unit; /* Interface unit number */
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int protocol; /* Data Link Layer Protocol field value */
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int state; /* State */
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int flags; /* Contains option bits */
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u_char id; /* Current id */
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u_char reqid; /* Current request id */
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u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
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int timeouttime; /* Timeout time in milliseconds */
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int maxconfreqtransmits; /* Maximum Configure-Request transmissions */
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int retransmits; /* Number of retransmissions left */
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int maxtermtransmits; /* Maximum Terminate-Request transmissions */
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int nakloops; /* Number of nak loops since last ack */
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int maxnakloops; /* Maximum number of nak loops tolerated */
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fsm_callbacks *callbacks; /* Callback routines */
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} fsm;
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/*
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* Link states.
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*/
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#define INITIAL 0 /* Down, hasn't been opened */
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#define STARTING 1 /* Down, been opened */
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#define CLOSED 2 /* Up, hasn't been opened */
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#define STOPPED 3 /* Open, waiting for down event */
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#define CLOSING 4 /* Terminating the connection, not open */
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#define STOPPING 5 /* Terminating, but open */
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#define REQSENT 6 /* We've sent a Config Request */
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#define ACKRCVD 7 /* We've received a Config Ack */
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#define ACKSENT 8 /* We've sent a Config Ack */
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#define OPENED 9 /* Connection available */
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/*
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* Flags - indicate options controlling FSM operation
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*/
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#define OPT_PASSIVE 1 /* Don't die if we don't get a response */
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#define OPT_RESTART 2 /* Treat 2nd OPEN as DOWN, UP */
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#define OPT_SILENT 4 /* Wait for peer to speak first */
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/*
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* Timeouts.
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*/
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#define DEFTIMEOUT 3 /* Timeout time in seconds */
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#define DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
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#define DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
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#define DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
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/*
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* Prototypes
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*/
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void fsm_init __P((fsm *));
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void fsm_lowerup __P((fsm *));
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void fsm_lowerdown __P((fsm *));
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void fsm_open __P((fsm *));
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void fsm_close __P((fsm *));
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void fsm_input __P((fsm *, u_char *, int));
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void fsm_protreject __P((fsm *));
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void fsm_sdata __P((fsm *, int, int, u_char *, int));
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/*
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* Variables
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*/
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extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
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