1/*
2 * lcp.h - Link Control Protocol definitions.
3 *
4 * Copyright (c) 1989 Carnegie Mellon University.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University.  The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * $Id$
20 */
21
22/*
23 * Options.
24 */
25#define CI_MRU		1	/* Maximum Receive Unit */
26#define CI_ASYNCMAP	2	/* Async Control Character Map */
27#define CI_AUTHTYPE	3	/* Authentication Type */
28#define CI_QUALITY	4	/* Quality Protocol */
29#define CI_MAGICNUMBER	5	/* Magic Number */
30#define CI_PCOMPRESSION	7	/* Protocol Field Compression */
31#define CI_ACCOMPRESSION 8	/* Address/Control Field Compression */
32#define CI_CALLBACK	13	/* callback */
33#define CI_MRRU		17	/* max reconstructed receive unit; multilink */
34#define CI_SSNHF	18	/* short sequence numbers for multilink */
35#define CI_EPDISC	19	/* endpoint discriminator */
36
37/*
38 * LCP-specific packet types.
39 */
40#define PROTREJ		8	/* Protocol Reject */
41#define ECHOREQ		9	/* Echo Request */
42#define ECHOREP		10	/* Echo Reply */
43#define DISCREQ		11	/* Discard Request */
44#define CBCP_OPT	6	/* Use callback control protocol */
45
46/*
47 * The state of options is described by an lcp_options structure.
48 */
49typedef struct lcp_options {
50    bool passive;		/* Don't die if we don't get a response */
51    bool silent;		/* Wait for the other end to start first */
52    bool restart;		/* Restart vs. exit after close */
53    bool neg_mru;		/* Negotiate the MRU? */
54    bool neg_asyncmap;		/* Negotiate the async map? */
55    bool neg_upap;		/* Ask for UPAP authentication? */
56    bool neg_chap;		/* Ask for CHAP authentication? */
57    bool neg_magicnumber;	/* Ask for magic number? */
58    bool neg_pcompression;	/* HDLC Protocol Field Compression? */
59    bool neg_accompression;	/* HDLC Address/Control Field Compression? */
60    bool neg_lqr;		/* Negotiate use of Link Quality Reports */
61    bool neg_cbcp;		/* Negotiate use of CBCP */
62    bool neg_mrru;		/* negotiate multilink MRRU */
63    bool neg_ssnhf;		/* negotiate short sequence numbers */
64    bool neg_endpoint;		/* negotiate endpoint discriminator */
65    int  mru;			/* Value of MRU */
66    int	 mrru;			/* Value of MRRU, and multilink enable */
67    u_char chap_mdtype;		/* which MD type (hashing algorithm) */
68    u_int32_t asyncmap;		/* Value of async map */
69    u_int32_t magicnumber;
70    int  numloops;		/* Number of loops during magic number neg. */
71    u_int32_t lqr_period;	/* Reporting period for LQR 1/100ths second */
72    struct epdisc endpoint;	/* endpoint discriminator */
73} lcp_options;
74
75extern fsm lcp_fsm[];
76extern lcp_options lcp_wantoptions[];
77extern lcp_options lcp_gotoptions[];
78extern lcp_options lcp_allowoptions[];
79extern lcp_options lcp_hisoptions[];
80
81#define DEFMRU	1500		/* Try for this */
82#define MINMRU	128		/* No MRUs below this */
83#define MAXMRU	16384		/* Normally limit MRU to this */
84
85void lcp_open __P((int));
86void lcp_close __P((int, char *));
87void lcp_lowerup __P((int));
88void lcp_lowerdown __P((int));
89void lcp_sprotrej __P((int, u_char *, int));	/* send protocol reject */
90
91extern struct protent lcp_protent;
92
93/* Default number of times we receive our magic number from the peer
94   before deciding the link is looped-back. */
95#define DEFLOOPBACKFAIL	10
96