lcp.h

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/*
 * lcp.h - Link Control Protocol 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.
 *
 * $Id$
 */

/*
 * Options.
 */
#define CI_MRU          1       /* Maximum Receive Unit */
#define CI_ASYNCMAP     2       /* Async Control Character Map */
#define CI_AUTHTYPE     3       /* Authentication Type */
#define CI_QUALITY      4       /* Quality Protocol */
#define CI_MAGICNUMBER  5       /* Magic Number */
#define CI_PCOMPRESSION 7       /* Protocol Field Compression */
#define CI_ACCOMPRESSION 8      /* Address/Control Field Compression */
#define CI_CALLBACK     13      /* callback */

/*
 * LCP-specific packet types.
 */
#define PROTREJ         8       /* Protocol Reject */
#define ECHOREQ         9       /* Echo Request */
#define ECHOREP         10      /* Echo Reply */
#define DISCREQ         11      /* Discard Request */
#define CBCP_OPT        6       /* Use callback control protocol */

/*
 * The state of options is described by an lcp_options structure.
 */
typedef struct lcp_options {
    bool passive;               /* Don't die if we don't get a response */
    bool silent;                /* Wait for the other end to start first */
    bool restart;               /* Restart vs. exit after close */
    bool neg_mru;               /* Negotiate the MRU? */
    bool neg_asyncmap;          /* Negotiate the async map? */
    bool neg_upap;              /* Ask for UPAP authentication? */
    bool neg_chap;              /* Ask for CHAP authentication? */
    bool neg_magicnumber;       /* Ask for magic number? */
    bool neg_pcompression;      /* HDLC Protocol Field Compression? */
    bool neg_accompression;     /* HDLC Address/Control Field Compression? */
    bool neg_lqr;               /* Negotiate use of Link Quality Reports */
    bool neg_cbcp;              /* Negotiate use of CBCP */
    int  mru;                   /* Value of MRU */
    u_char chap_mdtype;         /* which MD type (hashing algorithm) */
    uint32_t asyncmap;          /* Value of async map */
    uint32_t magicnumber;
    int numloops;               /* Number of loops during magic number neg. */
    uint32_t lqr_period;        /* Reporting period for LQR 1/100ths second */
} lcp_options;

extern fsm lcp_fsm[];
extern lcp_options lcp_wantoptions[];
extern lcp_options lcp_gotoptions[];
extern lcp_options lcp_allowoptions[];
extern lcp_options lcp_hisoptions[];
extern uint32_t xmit_accm[][8];

#define DEFMRU  1500            /* Try for this */
#define MINMRU  128             /* No MRUs below this */
#define MAXMRU  16384           /* Normally limit MRU to this */

void lcp_open(int);
void lcp_close(int, char *);
void lcp_lowerup(int);
void lcp_lowerdown(int);
void lcp_sprotrej(int, u_char *, int);  /* send protocol reject */

extern struct protent lcp_protent;

/* Default number of times we receive our magic number from the peer
   before deciding the link is looped-back. */
#define DEFLOOPBACKFAIL 10