/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* State of machine
*/
#define ST_INITIAL 0
#define ST_STARTING 1
#define ST_CLOSED 2
#define ST_STOPPED 3
#define ST_CLOSING 4
#define ST_STOPPING 5
#define ST_REQSENT 6
#define ST_ACKRCVD 7
#define ST_ACKSENT 8
#define ST_OPENED 9
#define ST_MAX 10
#define ST_UNDEF -1
#define MODE_REQ 0
#define MODE_NAK 1
#define MODE_REJ 2
#define MODE_NOP 3
#define MODE_ACK 4 /* pseudo mode for ccp negotiations */
#define OPEN_PASSIVE -1
#define FSM_REQ_TIMER 1
#define FSM_TRM_TIMER 2
#define FSM_OPTLEN 100
struct fsm;
struct fsm_retry {
u_int timeout; /* FSM retry frequency */
u_int maxreq; /* Max Config REQ retries */
u_int maxtrm; /* Max Term REQ retries */
};
struct fsm_decode {
u_char ack[FSM_OPTLEN], *ackend;
u_char nak[FSM_OPTLEN], *nakend;
u_char rej[FSM_OPTLEN], *rejend;
};
struct fsm_callbacks {
int (*LayerUp)(struct fsm *); /* Layer is now up (tlu) */
void (*LayerDown)(struct fsm *); /* About to come down (tld) */
void (*LayerStart)(struct fsm *); /* Layer about to start (tls) */
void (*LayerFinish)(struct fsm *); /* Layer now down (tlf) */
void (*InitRestartCounter)(struct fsm *, int);/* Set fsm timer load */
void (*SendConfigReq)(struct fsm *); /* Send REQ please */
void (*SentTerminateReq)(struct fsm *); /* Term REQ just sent */
void (*SendTerminateAck)(struct fsm *, u_char); /* Send Term ACK please */
void (*DecodeConfig)(struct fsm *, u_char *, u_char *, int,
struct fsm_decode *); /* Deal with incoming data */
int (*RecvResetReq)(struct fsm *fp); /* Reset output */
void (*RecvResetAck)(struct fsm *fp, u_char); /* Reset input */
};
struct fsm_parent {
void (*LayerStart) (void *, struct fsm *); /* tls */
void (*LayerUp) (void *, struct fsm *); /* tlu */
void (*LayerDown) (void *, struct fsm *); /* tld */
void (*LayerFinish) (void *, struct fsm *); /* tlf */
void *object;
};
struct link;
struct bundle;
struct fsm {
const char *name; /* Name of protocol */
u_short proto; /* Protocol number */
u_short min_code;
u_short max_code;
int open_mode; /* Delay before config REQ (-1 forever) */
unsigned state; /* State of the machine */
u_char reqid; /* Next request id */
int restart; /* Restart counter value */
struct {
int reqs; /* Max config REQs before a close() */
int naks; /* Max config NAKs before a close() */
int rejs; /* Max config REJs before a close() */
} more;
struct pppTimer FsmTimer; /* Restart Timer */
struct pppTimer OpenTimer; /* Delay before opening */
/*
* This timer times the ST_STOPPED state out after the given value
* (specified via "set stopped ..."). Although this isn't specified in the
* rfc, the rfc *does* say that "the application may use higher level
* timers to avoid deadlock". The StoppedTimer takes effect when the other
* side ABENDs rather than going into ST_ACKSENT (and sending the ACK),
* causing ppp to time out and drop into ST_STOPPED. At this point,
* nothing will change this state :-(
*/
struct pppTimer StoppedTimer;
int LogLevel;
/* The link layer active with this FSM (may be our bundle below) */
struct link *link;
/* Our high-level link */
struct bundle *bundle;
const struct fsm_parent *parent;
const struct fsm_callbacks *fn;
};
struct fsmheader {
u_char code; /* Request code */
u_char id; /* Identification */
u_short length; /* Length of packet */
};
#define CODE_CONFIGREQ 1
#define CODE_CONFIGACK 2
#define CODE_CONFIGNAK 3
#define CODE_CONFIGREJ 4
#define CODE_TERMREQ 5
#define CODE_TERMACK 6
#define CODE_CODEREJ 7
#define CODE_PROTOREJ 8
#define CODE_ECHOREQ 9 /* Used in LCP */
#define CODE_ECHOREP 10 /* Used in LCP */
#define CODE_DISCREQ 11
#define CODE_IDENT 12 /* Used in LCP Extension */
#define CODE_TIMEREM 13 /* Used in LCP Extension */
#define CODE_RESETREQ 14 /* Used in CCP */
#define CODE_RESETACK 15 /* Used in CCP */
struct fsm_opt_hdr {
u_char id;
u_char len;
} __packed;
#define MAX_FSM_OPT_LEN 52
struct fsm_opt {
struct fsm_opt_hdr hdr;
u_char data[MAX_FSM_OPT_LEN-2];
};
#define INC_FSM_OPT(ty, length, o) \
do { \
(o)->hdr.id = (ty); \
(o)->hdr.len = (length); \
(o) = (struct fsm_opt *)((u_char *)(o) + (length)); \
} while (0)
extern void fsm_Init(struct fsm *, const char *, u_short, int, int, int,
struct bundle *, struct link *, const struct fsm_parent *,
struct fsm_callbacks *, const char * const [3]);
extern void fsm_Output(struct fsm *, u_int, u_int, u_char *, unsigned, int);
extern void fsm_Open(struct fsm *);
extern void fsm_Up(struct fsm *);
extern void fsm_Down(struct fsm *);
extern void fsm_Input(struct fsm *, struct mbuf *);
extern void fsm_Close(struct fsm *);
extern int fsm_NullRecvResetReq(struct fsm *);
extern void fsm_NullRecvResetAck(struct fsm *, u_char);
extern void fsm_Reopen(struct fsm *);
extern void fsm2initial(struct fsm *);
extern const char *State2Nam(u_int);
extern struct fsm_opt *fsm_readopt(u_char **);
extern void fsm_rej(struct fsm_decode *, const struct fsm_opt *);
extern void fsm_ack(struct fsm_decode *, const struct fsm_opt *);
extern void fsm_nak(struct fsm_decode *, const struct fsm_opt *);
extern void fsm_opt_normalise(struct fsm_decode *);
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