freebsd-dev/usr.sbin/ppp/fsm.h

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/*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
*
* 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 the Internet Initiative Japan. The name of the
* IIJ 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.
*
* $Id: fsm.h,v 1.19 1998/06/25 22:33:24 brian Exp $
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*
* TODO:
*/
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/*
* 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 */
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#define OPEN_PASSIVE -1
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#define FSM_REQ_TIMER 1
#define FSM_TRM_TIMER 2
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 */
};
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struct fsm_decode {
u_char ack[100], *ackend;
u_char nak[100], *nakend;
u_char rej[100], *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 up (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 */
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void (*DecodeConfig) (struct fsm *, u_char *, int, int, struct fsm_decode *);
/* Deal with incoming data */
void (*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;
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struct fsm {
const char *name; /* Name of protocol */
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u_short proto; /* Protocol number */
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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u_short min_code;
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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;
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struct pppTimer FsmTimer; /* Restart Timer */
struct pppTimer OpenTimer; /* Delay before opening */
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/*
* 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;
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};
struct fsmheader {
u_char code; /* Request code */
u_char id; /* Identification */
u_short length; /* Length of packet */
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};
#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 */
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#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 */
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/* Minimum config req size. This struct is *only* used for it's size */
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struct fsmconfig {
u_char type;
u_char length;
};
extern void fsm_Init(struct fsm *, const char *, u_short, int, int, int,
struct bundle *, struct link *, const struct fsm_parent *,
o Move struct lcp and struct ccp into struct link. o Remove bundle2lcp(), bundle2ccp() and bundle2link(). They're too resource-hungry and we have `owner pointers' to do their job. o Make our FSM understand LCPs that are always ST_OPENED (with a minimum code that != 1). o Send FSM code rejects for invalid codes. o Make our bundle fsm_parent deal with multiple links. o Make timer diagnostics pretty and allow access via ~t in `term' mode (not just when logging debug) and `show timers'. Only show timers every second in debug mode, otherwise we get too many diagnostics to be useful (we probably still do). Also, don't restrict ~m in term mode to depend on debug logging. o Rationalise our bundles' phases. o Create struct mp (multilink protocol). This is both an NCP and a type of struct link. It feeds off other NCPs for output, passing fragmented packets into the queues of available datalinks. It also gets PROTO_MP input, reassembles the fragments into ppp frames, and passes them back to the HDLC layer that the fragments were passed from. ** It's not yet possible to enter multilink mode :-( ** o Add `set weight' (requires context) for deciding on a links weighting in multilink mode. Weighting is simplistic (and probably badly implemented) for now. o Remove the function pointers in struct link. They ended up only applying to physical links. o Configure our tun device with an MTU equal to the MRU from struct mp's LCP and a speed equal to the sum of our link speeds. o `show {lcp,ccp,proto}' and `set deflate' now have optional context and use ChooseLink() to decide on which `struct link' to use. This allows behaviour as before when in non-multilink mode, and allows access to the MP logical link in multilink mode. o Ignore reconnect and redial values when in -direct mode and when cleaning up. Always redial when in -ddial or -dedicated mode (unless cleaning up). o Tell our links to `staydown' when we close them due to a signal. o Remove remaining `#ifdef SIGALRM's (ppp doesn't function without alarms). o Don't bother strdup()ing our physical link name. o Various other cosmetic changes.
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struct fsm_callbacks *, const char *[3]);
extern void fsm_Output(struct fsm *, u_int, u_int, u_char *, 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 void 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);