202 lines
7.0 KiB
C
202 lines
7.0 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* 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) */
|
|
int 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;
|
|
};
|
|
|
|
#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 *, int, 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 *);
|