1 /* $NetBSD: mppe.h,v 1.2 2013/11/28 22:33:42 christos Exp $ */ 2 3 /* 4 * mppe.h - Definitions for MPPE 5 * 6 * Copyright (c) 2008 Paul Mackerras. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. The name(s) of the authors of this software must not be used to 21 * endorse or promote products derived from this software without 22 * prior written permission. 23 * 24 * 4. Redistributions of any form whatsoever must retain the following 25 * acknowledgment: 26 * "This product includes software developed by Paul Mackerras 27 * <paulus@samba.org>". 28 * 29 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO 30 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 31 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY 32 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 33 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 34 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 35 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 36 */ 37 38 #define MPPE_PAD 4 /* MPPE growth per frame */ 39 #define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */ 40 41 /* option bits for ccp_options.mppe */ 42 #define MPPE_OPT_40 0x01 /* 40 bit */ 43 #define MPPE_OPT_128 0x02 /* 128 bit */ 44 #define MPPE_OPT_STATEFUL 0x04 /* stateful mode */ 45 /* unsupported opts */ 46 #define MPPE_OPT_56 0x08 /* 56 bit */ 47 #define MPPE_OPT_MPPC 0x10 /* MPPC compression */ 48 #define MPPE_OPT_D 0x20 /* Unknown */ 49 #define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D) 50 #define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */ 51 52 /* 53 * This is not nice ... the alternative is a bitfield struct though. 54 * And unfortunately, we cannot share the same bits for the option 55 * names above since C and H are the same bit. We could do a u_int32 56 * but then we have to do a htonl() all the time and/or we still need 57 * to know which octet is which. 58 */ 59 #define MPPE_C_BIT 0x01 /* MPPC */ 60 #define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */ 61 #define MPPE_L_BIT 0x20 /* 40-bit */ 62 #define MPPE_S_BIT 0x40 /* 128-bit */ 63 #define MPPE_M_BIT 0x80 /* 56-bit, not supported */ 64 #define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */ 65 66 /* Does not include H bit; used for least significant octet only. */ 67 #define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT) 68 69 /* Build a CI from mppe opts (see RFC 3078) */ 70 #define MPPE_OPTS_TO_CI(opts, ci) \ 71 do { \ 72 u_char *ptr = ci; /* u_char[4] */ \ 73 \ 74 /* H bit */ \ 75 if (opts & MPPE_OPT_STATEFUL) \ 76 *ptr++ = 0x0; \ 77 else \ 78 *ptr++ = MPPE_H_BIT; \ 79 *ptr++ = 0; \ 80 *ptr++ = 0; \ 81 \ 82 /* S,L bits */ \ 83 *ptr = 0; \ 84 if (opts & MPPE_OPT_128) \ 85 *ptr |= MPPE_S_BIT; \ 86 if (opts & MPPE_OPT_40) \ 87 *ptr |= MPPE_L_BIT; \ 88 /* M,D,C bits not supported */ \ 89 } while (/* CONSTCOND */ 0) 90 91 /* The reverse of the above */ 92 #define MPPE_CI_TO_OPTS(ci, opts) \ 93 do { \ 94 u_char *ptr = ci; /* u_char[4] */ \ 95 \ 96 opts = 0; \ 97 \ 98 /* H bit */ \ 99 if (!(ptr[0] & MPPE_H_BIT)) \ 100 opts |= MPPE_OPT_STATEFUL; \ 101 \ 102 /* S,L bits */ \ 103 if (ptr[3] & MPPE_S_BIT) \ 104 opts |= MPPE_OPT_128; \ 105 if (ptr[3] & MPPE_L_BIT) \ 106 opts |= MPPE_OPT_40; \ 107 \ 108 /* M,D,C bits */ \ 109 if (ptr[3] & MPPE_M_BIT) \ 110 opts |= MPPE_OPT_56; \ 111 if (ptr[3] & MPPE_D_BIT) \ 112 opts |= MPPE_OPT_D; \ 113 if (ptr[3] & MPPE_C_BIT) \ 114 opts |= MPPE_OPT_MPPC; \ 115 \ 116 /* Other bits */ \ 117 if (ptr[0] & ~MPPE_H_BIT) \ 118 opts |= MPPE_OPT_UNKNOWN; \ 119 if (ptr[1] || ptr[2]) \ 120 opts |= MPPE_OPT_UNKNOWN; \ 121 if (ptr[3] & ~MPPE_ALL_BITS) \ 122 opts |= MPPE_OPT_UNKNOWN; \ 123 } while (/* CONSTCOND */ 0) 124