1*b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2224cf5adSJeff Kirsher #define MPPE_PAD 4 /* MPPE growth per frame */ 3224cf5adSJeff Kirsher #define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */ 4224cf5adSJeff Kirsher 5224cf5adSJeff Kirsher /* option bits for ccp_options.mppe */ 6224cf5adSJeff Kirsher #define MPPE_OPT_40 0x01 /* 40 bit */ 7224cf5adSJeff Kirsher #define MPPE_OPT_128 0x02 /* 128 bit */ 8224cf5adSJeff Kirsher #define MPPE_OPT_STATEFUL 0x04 /* stateful mode */ 9224cf5adSJeff Kirsher /* unsupported opts */ 10224cf5adSJeff Kirsher #define MPPE_OPT_56 0x08 /* 56 bit */ 11224cf5adSJeff Kirsher #define MPPE_OPT_MPPC 0x10 /* MPPC compression */ 12224cf5adSJeff Kirsher #define MPPE_OPT_D 0x20 /* Unknown */ 13224cf5adSJeff Kirsher #define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D) 14224cf5adSJeff Kirsher #define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */ 15224cf5adSJeff Kirsher 16224cf5adSJeff Kirsher /* 17224cf5adSJeff Kirsher * This is not nice ... the alternative is a bitfield struct though. 18224cf5adSJeff Kirsher * And unfortunately, we cannot share the same bits for the option 19224cf5adSJeff Kirsher * names above since C and H are the same bit. We could do a u_int32 20224cf5adSJeff Kirsher * but then we have to do a htonl() all the time and/or we still need 21224cf5adSJeff Kirsher * to know which octet is which. 22224cf5adSJeff Kirsher */ 23224cf5adSJeff Kirsher #define MPPE_C_BIT 0x01 /* MPPC */ 24224cf5adSJeff Kirsher #define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */ 25224cf5adSJeff Kirsher #define MPPE_L_BIT 0x20 /* 40-bit */ 26224cf5adSJeff Kirsher #define MPPE_S_BIT 0x40 /* 128-bit */ 27224cf5adSJeff Kirsher #define MPPE_M_BIT 0x80 /* 56-bit, not supported */ 28224cf5adSJeff Kirsher #define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */ 29224cf5adSJeff Kirsher 30224cf5adSJeff Kirsher /* Does not include H bit; used for least significant octet only. */ 31224cf5adSJeff Kirsher #define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT) 32224cf5adSJeff Kirsher 33224cf5adSJeff Kirsher /* Build a CI from mppe opts (see RFC 3078) */ 34224cf5adSJeff Kirsher #define MPPE_OPTS_TO_CI(opts, ci) \ 35224cf5adSJeff Kirsher do { \ 36224cf5adSJeff Kirsher u_char *ptr = ci; /* u_char[4] */ \ 37224cf5adSJeff Kirsher \ 38224cf5adSJeff Kirsher /* H bit */ \ 39224cf5adSJeff Kirsher if (opts & MPPE_OPT_STATEFUL) \ 40224cf5adSJeff Kirsher *ptr++ = 0x0; \ 41224cf5adSJeff Kirsher else \ 42224cf5adSJeff Kirsher *ptr++ = MPPE_H_BIT; \ 43224cf5adSJeff Kirsher *ptr++ = 0; \ 44224cf5adSJeff Kirsher *ptr++ = 0; \ 45224cf5adSJeff Kirsher \ 46224cf5adSJeff Kirsher /* S,L bits */ \ 47224cf5adSJeff Kirsher *ptr = 0; \ 48224cf5adSJeff Kirsher if (opts & MPPE_OPT_128) \ 49224cf5adSJeff Kirsher *ptr |= MPPE_S_BIT; \ 50224cf5adSJeff Kirsher if (opts & MPPE_OPT_40) \ 51224cf5adSJeff Kirsher *ptr |= MPPE_L_BIT; \ 52224cf5adSJeff Kirsher /* M,D,C bits not supported */ \ 53224cf5adSJeff Kirsher } while (/* CONSTCOND */ 0) 54224cf5adSJeff Kirsher 55224cf5adSJeff Kirsher /* The reverse of the above */ 56224cf5adSJeff Kirsher #define MPPE_CI_TO_OPTS(ci, opts) \ 57224cf5adSJeff Kirsher do { \ 58224cf5adSJeff Kirsher u_char *ptr = ci; /* u_char[4] */ \ 59224cf5adSJeff Kirsher \ 60224cf5adSJeff Kirsher opts = 0; \ 61224cf5adSJeff Kirsher \ 62224cf5adSJeff Kirsher /* H bit */ \ 63224cf5adSJeff Kirsher if (!(ptr[0] & MPPE_H_BIT)) \ 64224cf5adSJeff Kirsher opts |= MPPE_OPT_STATEFUL; \ 65224cf5adSJeff Kirsher \ 66224cf5adSJeff Kirsher /* S,L bits */ \ 67224cf5adSJeff Kirsher if (ptr[3] & MPPE_S_BIT) \ 68224cf5adSJeff Kirsher opts |= MPPE_OPT_128; \ 69224cf5adSJeff Kirsher if (ptr[3] & MPPE_L_BIT) \ 70224cf5adSJeff Kirsher opts |= MPPE_OPT_40; \ 71224cf5adSJeff Kirsher \ 72224cf5adSJeff Kirsher /* M,D,C bits */ \ 73224cf5adSJeff Kirsher if (ptr[3] & MPPE_M_BIT) \ 74224cf5adSJeff Kirsher opts |= MPPE_OPT_56; \ 75224cf5adSJeff Kirsher if (ptr[3] & MPPE_D_BIT) \ 76224cf5adSJeff Kirsher opts |= MPPE_OPT_D; \ 77224cf5adSJeff Kirsher if (ptr[3] & MPPE_C_BIT) \ 78224cf5adSJeff Kirsher opts |= MPPE_OPT_MPPC; \ 79224cf5adSJeff Kirsher \ 80224cf5adSJeff Kirsher /* Other bits */ \ 81224cf5adSJeff Kirsher if (ptr[0] & ~MPPE_H_BIT) \ 82224cf5adSJeff Kirsher opts |= MPPE_OPT_UNKNOWN; \ 83224cf5adSJeff Kirsher if (ptr[1] || ptr[2]) \ 84224cf5adSJeff Kirsher opts |= MPPE_OPT_UNKNOWN; \ 85224cf5adSJeff Kirsher if (ptr[3] & ~MPPE_ALL_BITS) \ 86224cf5adSJeff Kirsher opts |= MPPE_OPT_UNKNOWN; \ 87224cf5adSJeff Kirsher } while (/* CONSTCOND */ 0) 88