1 #define MPPE_PAD 4 /* MPPE growth per frame */ 2 #define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */ 3 4 /* option bits for ccp_options.mppe */ 5 #define MPPE_OPT_40 0x01 /* 40 bit */ 6 #define MPPE_OPT_128 0x02 /* 128 bit */ 7 #define MPPE_OPT_STATEFUL 0x04 /* stateful mode */ 8 /* unsupported opts */ 9 #define MPPE_OPT_56 0x08 /* 56 bit */ 10 #define MPPE_OPT_MPPC 0x10 /* MPPC compression */ 11 #define MPPE_OPT_D 0x20 /* Unknown */ 12 #define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D) 13 #define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */ 14 15 /* 16 * This is not nice ... the alternative is a bitfield struct though. 17 * And unfortunately, we cannot share the same bits for the option 18 * names above since C and H are the same bit. We could do a u_int32 19 * but then we have to do a htonl() all the time and/or we still need 20 * to know which octet is which. 21 */ 22 #define MPPE_C_BIT 0x01 /* MPPC */ 23 #define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */ 24 #define MPPE_L_BIT 0x20 /* 40-bit */ 25 #define MPPE_S_BIT 0x40 /* 128-bit */ 26 #define MPPE_M_BIT 0x80 /* 56-bit, not supported */ 27 #define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */ 28 29 /* Does not include H bit; used for least significant octet only. */ 30 #define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT) 31 32 /* Build a CI from mppe opts (see RFC 3078) */ 33 #define MPPE_OPTS_TO_CI(opts, ci) \ 34 do { \ 35 u_char *ptr = ci; /* u_char[4] */ \ 36 \ 37 /* H bit */ \ 38 if (opts & MPPE_OPT_STATEFUL) \ 39 *ptr++ = 0x0; \ 40 else \ 41 *ptr++ = MPPE_H_BIT; \ 42 *ptr++ = 0; \ 43 *ptr++ = 0; \ 44 \ 45 /* S,L bits */ \ 46 *ptr = 0; \ 47 if (opts & MPPE_OPT_128) \ 48 *ptr |= MPPE_S_BIT; \ 49 if (opts & MPPE_OPT_40) \ 50 *ptr |= MPPE_L_BIT; \ 51 /* M,D,C bits not supported */ \ 52 } while (/* CONSTCOND */ 0) 53 54 /* The reverse of the above */ 55 #define MPPE_CI_TO_OPTS(ci, opts) \ 56 do { \ 57 u_char *ptr = ci; /* u_char[4] */ \ 58 \ 59 opts = 0; \ 60 \ 61 /* H bit */ \ 62 if (!(ptr[0] & MPPE_H_BIT)) \ 63 opts |= MPPE_OPT_STATEFUL; \ 64 \ 65 /* S,L bits */ \ 66 if (ptr[3] & MPPE_S_BIT) \ 67 opts |= MPPE_OPT_128; \ 68 if (ptr[3] & MPPE_L_BIT) \ 69 opts |= MPPE_OPT_40; \ 70 \ 71 /* M,D,C bits */ \ 72 if (ptr[3] & MPPE_M_BIT) \ 73 opts |= MPPE_OPT_56; \ 74 if (ptr[3] & MPPE_D_BIT) \ 75 opts |= MPPE_OPT_D; \ 76 if (ptr[3] & MPPE_C_BIT) \ 77 opts |= MPPE_OPT_MPPC; \ 78 \ 79 /* Other bits */ \ 80 if (ptr[0] & ~MPPE_H_BIT) \ 81 opts |= MPPE_OPT_UNKNOWN; \ 82 if (ptr[1] || ptr[2]) \ 83 opts |= MPPE_OPT_UNKNOWN; \ 84 if (ptr[3] & ~MPPE_ALL_BITS) \ 85 opts |= MPPE_OPT_UNKNOWN; \ 86 } while (/* CONSTCOND */ 0) 87