145 lines
4.9 KiB
C
145 lines
4.9 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
|
|
/*
|
|
* Each FSM is described by an fsm structure and fsm callbacks.
|
|
*/
|
|
typedef struct fsm {
|
|
int unit; /* Interface unit number */
|
|
int protocol; /* Data Link Layer Protocol field value */
|
|
int state; /* State */
|
|
int flags; /* Contains option bits */
|
|
u_char id; /* Current id */
|
|
u_char reqid; /* Current request id */
|
|
u_char seen_ack; /* Have received valid Ack/Nak/Rej to Req */
|
|
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 */
|
|
struct fsm_callbacks *callbacks; /* Callback routines */
|
|
char *term_reason; /* Reason for closing protocol */
|
|
int term_reason_len; /* Length of term_reason */
|
|
} fsm;
|
|
|
|
|
|
typedef struct fsm_callbacks {
|
|
void (*resetci) /* Reset our Configuration Information */
|
|
(fsm *);
|
|
int (*cilen) /* Length of our Configuration Information */
|
|
(fsm *);
|
|
void (*addci) /* Add our Configuration Information */
|
|
(fsm *, u_char *, int *);
|
|
int (*ackci) /* ACK our Configuration Information */
|
|
(fsm *, u_char *, int);
|
|
int (*nakci) /* NAK our Configuration Information */
|
|
(fsm *, u_char *, int);
|
|
int (*rejci) /* Reject our Configuration Information */
|
|
(fsm *, u_char *, int);
|
|
int (*reqci) /* Request peer's Configuration Information */
|
|
(fsm *, u_char *, int *, int);
|
|
void (*up) /* Called when fsm reaches OPENED state */
|
|
(fsm *);
|
|
void (*down) /* Called when fsm leaves OPENED state */
|
|
(fsm *);
|
|
void (*starting) /* Called when we want the lower layer */
|
|
(fsm *);
|
|
void (*finished) /* Called when we don't want the lower layer */
|
|
(fsm *);
|
|
void (*protreject) /* Called when Protocol-Reject received */
|
|
(int);
|
|
void (*retransmit) /* Retransmission is necessary */
|
|
(fsm *);
|
|
int (*extcode) /* Called when unknown code received */
|
|
(fsm *, int, int, u_char *, int);
|
|
char *proto_name; /* String name for protocol (for messages) */
|
|
} fsm_callbacks;
|
|
|
|
|
|
/*
|
|
* Link states.
|
|
*/
|
|
#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 */
|
|
|
|
|
|
/*
|
|
* Timeouts.
|
|
*/
|
|
#define DEFTIMEOUT 3 /* Timeout time in seconds */
|
|
#define DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
|
|
#define DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
|
|
#define DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
|
|
|
|
|
|
/*
|
|
* Prototypes
|
|
*/
|
|
void fsm_init(fsm *);
|
|
void fsm_lowerup(fsm *);
|
|
void fsm_lowerdown(fsm *);
|
|
void fsm_open(fsm *);
|
|
void fsm_close(fsm *, char *);
|
|
void fsm_input(fsm *, u_char *, int);
|
|
void fsm_protreject(fsm *);
|
|
void fsm_sdata(fsm *, int, int, u_char *, int);
|
|
|
|
|
|
/*
|
|
* Variables
|
|
*/
|
|
extern int peer_mru[]; /* currently negotiated peer MRU (per unit) */
|