897f9429f9
open capable of re-negotiatiating the various layers. It is now possible to change various link options and then re-open the relevant layer, making the changes effective - for example, switching off VJ compression or starting ECHO LQRs on-the-fly.
160 lines
5.3 KiB
C
160 lines
5.3 KiB
C
/*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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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 the Internet Initiative Japan. The name of the
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* IIJ 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 1.18 1998/06/20 00:19:38 brian Exp $
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*
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* TODO:
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*/
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/*
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* State of machine
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*/
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#define ST_INITIAL 0
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#define ST_STARTING 1
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#define ST_CLOSED 2
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#define ST_STOPPED 3
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#define ST_CLOSING 4
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#define ST_STOPPING 5
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#define ST_REQSENT 6
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#define ST_ACKRCVD 7
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#define ST_ACKSENT 8
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#define ST_OPENED 9
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#define ST_MAX 10
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#define ST_UNDEF -1
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#define MODE_REQ 0
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#define MODE_NAK 1
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#define MODE_REJ 2
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#define MODE_NOP 3
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#define MODE_ACK 4 /* pseudo mode for ccp negotiations */
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#define OPEN_PASSIVE -1
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struct fsm;
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struct fsm_decode {
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u_char ack[100], *ackend;
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u_char nak[100], *nakend;
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u_char rej[100], *rejend;
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};
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struct fsm_callbacks {
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int (*LayerUp) (struct fsm *); /* Layer is now up (tlu) */
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void (*LayerDown) (struct fsm *); /* About to come down (tld) */
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void (*LayerStart) (struct fsm *); /* Layer about to start up (tls) */
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void (*LayerFinish) (struct fsm *); /* Layer now down (tlf) */
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void (*InitRestartCounter) (struct fsm *); /* Set fsm timer load */
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void (*SendConfigReq) (struct fsm *); /* Send REQ please */
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void (*SentTerminateReq) (struct fsm *); /* Term REQ just sent */
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void (*SendTerminateAck) (struct fsm *, u_char); /* Send Term ACK please */
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void (*DecodeConfig) (struct fsm *, u_char *, int, int, struct fsm_decode *);
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/* Deal with incoming data */
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void (*RecvResetReq) (struct fsm *fp); /* Reset output */
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void (*RecvResetAck) (struct fsm *fp, u_char); /* Reset input */
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};
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struct fsm_parent {
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void (*LayerStart) (void *, struct fsm *); /* tls */
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void (*LayerUp) (void *, struct fsm *); /* tlu */
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void (*LayerDown) (void *, struct fsm *); /* tld */
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void (*LayerFinish) (void *, struct fsm *); /* tlf */
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void *object;
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};
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struct link;
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struct bundle;
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struct fsm {
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const char *name; /* Name of protocol */
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u_short proto; /* Protocol number */
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u_short min_code;
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u_short max_code;
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int open_mode; /* Delay before config REQ (-1 forever) */
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int state; /* State of the machine */
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u_char reqid; /* Next request id */
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int restart; /* Restart counter value */
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int maxconfig; /* Max config REQ before a close() */
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struct pppTimer FsmTimer; /* Restart Timer */
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struct pppTimer OpenTimer; /* Delay before opening */
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/*
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* This timer times the ST_STOPPED state out after the given value
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* (specified via "set stopped ..."). Although this isn't specified in the
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* rfc, the rfc *does* say that "the application may use higher level
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* timers to avoid deadlock". The StoppedTimer takes effect when the other
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* side ABENDs rather than going into ST_ACKSENT (and sending the ACK),
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* causing ppp to time out and drop into ST_STOPPED. At this point,
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* nothing will change this state :-(
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*/
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struct pppTimer StoppedTimer;
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int LogLevel;
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/* The link layer active with this FSM (may be our bundle below) */
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struct link *link;
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/* Our high-level link */
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struct bundle *bundle;
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const struct fsm_parent *parent;
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const struct fsm_callbacks *fn;
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};
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struct fsmheader {
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u_char code; /* Request code */
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u_char id; /* Identification */
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u_short length; /* Length of packet */
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};
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#define CODE_CONFIGREQ 1
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#define CODE_CONFIGACK 2
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#define CODE_CONFIGNAK 3
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#define CODE_CONFIGREJ 4
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#define CODE_TERMREQ 5
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#define CODE_TERMACK 6
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#define CODE_CODEREJ 7
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#define CODE_PROTOREJ 8
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#define CODE_ECHOREQ 9 /* Used in LCP */
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#define CODE_ECHOREP 10 /* Used in LCP */
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#define CODE_DISCREQ 11
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#define CODE_IDENT 12 /* Used in LCP Extension */
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#define CODE_TIMEREM 13 /* Used in LCP Extension */
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#define CODE_RESETREQ 14 /* Used in CCP */
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#define CODE_RESETACK 15 /* Used in CCP */
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/* Minimum config req size. This struct is *only* used for it's size */
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struct fsmconfig {
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u_char type;
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u_char length;
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};
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extern void fsm_Init(struct fsm *, const char *, u_short, int, int, int, int,
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struct bundle *, struct link *, const struct fsm_parent *,
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struct fsm_callbacks *, const char *[3]);
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extern void fsm_Output(struct fsm *, u_int, u_int, u_char *, int);
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extern void fsm_Open(struct fsm *);
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extern void fsm_Up(struct fsm *);
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extern void fsm_Down(struct fsm *);
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extern void fsm_Input(struct fsm *, struct mbuf *);
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extern void fsm_Close(struct fsm *);
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extern void fsm_NullRecvResetReq(struct fsm *);
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extern void fsm_NullRecvResetAck(struct fsm *, u_char);
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extern void fsm_Reopen(struct fsm *);
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extern void fsm2initial(struct fsm *);
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extern const char *State2Nam(u_int);
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