ccp.h

00001 /*
00002  * ccp.h - Definitions for PPP Compression Control Protocol.
00003  *
00004  * Copyright (c) 1994-2002 Paul Mackerras. All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  *
00010  * 1. Redistributions of source code must retain the above copyright
00011  *    notice, this list of conditions and the following disclaimer.
00012  *
00013  * 2. The name(s) of the authors of this software must not be used to
00014  *    endorse or promote products derived from this software without
00015  *    prior written permission.
00016  *
00017  * 3. Redistributions of any form whatsoever must retain the following
00018  *    acknowledgment:
00019  *    "This product includes software developed by Paul Mackerras
00020  *     <paulus@samba.org>".
00021  *
00022  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
00023  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
00024  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
00025  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00026  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
00027  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
00028  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00029  *
00030  * $Id: ccp.h,v 1.12 2004/11/04 10:02:26 paulus Exp $
00031  */
00032 
00033 #include "ppp_opts.h"
00034 #if PPP_SUPPORT && CCP_SUPPORT  /* don't build if not configured for use in ppp_opts.h */
00035 
00036 #ifndef CCP_H
00037 #define CCP_H
00038 
00039 #ifdef __cplusplus
00040 extern "C" {
00041 #endif
00042 
00043 /*
00044  * CCP codes.
00045  */
00046 
00047 #define CCP_CONFREQ 1
00048 #define CCP_CONFACK 2
00049 #define CCP_TERMREQ 5
00050 #define CCP_TERMACK 6
00051 #define CCP_RESETREQ    14
00052 #define CCP_RESETACK    15
00053 
00054 /*
00055  * Max # bytes for a CCP option
00056  */
00057 
00058 #define CCP_MAX_OPTION_LENGTH   32
00059 
00060 /*
00061  * Parts of a CCP packet.
00062  */
00063 
00064 #define CCP_CODE(dp)        ((dp)[0])
00065 #define CCP_ID(dp)      ((dp)[1])
00066 #define CCP_LENGTH(dp)      (((dp)[2] << 8) + (dp)[3])
00067 #define CCP_HDRLEN      4
00068 
00069 #define CCP_OPT_CODE(dp)    ((dp)[0])
00070 #define CCP_OPT_LENGTH(dp)  ((dp)[1])
00071 #define CCP_OPT_MINLEN      2
00072 
00073 #if BSDCOMPRESS_SUPPORT
00074 /*
00075  * Definitions for BSD-Compress.
00076  */
00077 
00078 #define CI_BSD_COMPRESS     21  /* config. option for BSD-Compress */
00079 #define CILEN_BSD_COMPRESS  3   /* length of config. option */
00080 
00081 /* Macros for handling the 3rd byte of the BSD-Compress config option. */
00082 #define BSD_NBITS(x)        ((x) & 0x1F)    /* number of bits requested */
00083 #define BSD_VERSION(x)      ((x) >> 5)  /* version of option format */
00084 #define BSD_CURRENT_VERSION 1       /* current version number */
00085 #define BSD_MAKE_OPT(v, n)  (((v) << 5) | (n))
00086 
00087 #define BSD_MIN_BITS        9   /* smallest code size supported */
00088 #define BSD_MAX_BITS        15  /* largest code size supported */
00089 #endif /* BSDCOMPRESS_SUPPORT */
00090 
00091 #if DEFLATE_SUPPORT
00092 /*
00093  * Definitions for Deflate.
00094  */
00095 
00096 #define CI_DEFLATE      26  /* config option for Deflate */
00097 #define CI_DEFLATE_DRAFT    24  /* value used in original draft RFC */
00098 #define CILEN_DEFLATE       4   /* length of its config option */
00099 
00100 #define DEFLATE_MIN_SIZE    9
00101 #define DEFLATE_MAX_SIZE    15
00102 #define DEFLATE_METHOD_VAL  8
00103 #define DEFLATE_SIZE(x)     (((x) >> 4) + 8)
00104 #define DEFLATE_METHOD(x)   ((x) & 0x0F)
00105 #define DEFLATE_MAKE_OPT(w) ((((w) - 8) << 4) + DEFLATE_METHOD_VAL)
00106 #define DEFLATE_CHK_SEQUENCE    0
00107 #endif /* DEFLATE_SUPPORT */
00108 
00109 #if MPPE_SUPPORT
00110 /*
00111  * Definitions for MPPE.
00112  */
00113 
00114 #define CI_MPPE                18      /* config option for MPPE */
00115 #define CILEN_MPPE              6      /* length of config option */
00116 #endif /* MPPE_SUPPORT */
00117 
00118 #if PREDICTOR_SUPPORT
00119 /*
00120  * Definitions for other, as yet unsupported, compression methods.
00121  */
00122 
00123 #define CI_PREDICTOR_1      1   /* config option for Predictor-1 */
00124 #define CILEN_PREDICTOR_1   2   /* length of its config option */
00125 #define CI_PREDICTOR_2      2   /* config option for Predictor-2 */
00126 #define CILEN_PREDICTOR_2   2   /* length of its config option */
00127 #endif /* PREDICTOR_SUPPORT */
00128 
00129 typedef struct ccp_options {
00130 #if DEFLATE_SUPPORT
00131     unsigned int deflate          :1; /* do Deflate? */
00132     unsigned int deflate_correct  :1; /* use correct code for deflate? */
00133     unsigned int deflate_draft    :1; /* use draft RFC code for deflate? */
00134 #endif /* DEFLATE_SUPPORT */
00135 #if BSDCOMPRESS_SUPPORT
00136     unsigned int bsd_compress     :1; /* do BSD Compress? */
00137 #endif /* BSDCOMPRESS_SUPPORT */
00138 #if PREDICTOR_SUPPORT
00139     unsigned int predictor_1      :1; /* do Predictor-1? */
00140     unsigned int predictor_2      :1; /* do Predictor-2? */
00141 #endif /* PREDICTOR_SUPPORT */
00142 
00143 #if MPPE_SUPPORT
00144     u8_t mppe;          /* MPPE bitfield */
00145 #endif /* MPPE_SUPPORT */
00146 #if BSDCOMPRESS_SUPPORT
00147     u_short bsd_bits;       /* # bits/code for BSD Compress */
00148 #endif /* BSDCOMPRESS_SUPPORT */
00149 #if DEFLATE_SUPPORT
00150     u_short deflate_size;   /* lg(window size) for Deflate */
00151 #endif /* DEFLATE_SUPPORT */
00152     u8_t method;        /* code for chosen compression method */
00153 } ccp_options;
00154 
00155 extern const struct protent ccp_protent;
00156 
00157 void ccp_resetrequest(ppp_pcb *pcb);  /* Issue a reset-request. */
00158 
00159 #ifdef __cplusplus
00160 }
00161 #endif
00162 
00163 #endif /* CCP_H */
00164 #endif /* PPP_SUPPORT && CCP_SUPPORT */