#define MPPE_PAD 4 /* MPPE growth per frame */ #define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */ /* option bits for ccp_options.mppe */ #define MPPE_OPT_40 0x01 /* 40 bit */ #define MPPE_OPT_128 0x02 /* 128 bit */ #define MPPE_OPT_STATEFUL 0x04 /* stateful mode */ /* unsupported opts */ #define MPPE_OPT_56 0x08 /* 56 bit */ #define MPPE_OPT_MPPC 0x10 /* MPPC compression */ #define MPPE_OPT_D 0x20 /* Unknown */ #define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D) #define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */ /* * This is not nice ... the alternative is a bitfield struct though. * And unfortunately, we cannot share the same bits for the option * names above since C and H are the same bit. We could do a u_int32 * but then we have to do a htonl() all the time and/or we still need * to know which octet is which. */ #define MPPE_C_BIT 0x01 /* MPPC */ #define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */ #define MPPE_L_BIT 0x20 /* 40-bit */ #define MPPE_S_BIT 0x40 /* 128-bit */ #define MPPE_M_BIT 0x80 /* 56-bit, not supported */ #define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */ /* Does not include H bit; used for least significant octet only. */ #define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT) /* Build a CI from mppe opts (see RFC 3078) */ #define MPPE_OPTS_TO_CI(opts, ci) \ do { \ u_char *ptr = ci; /* u_char[4] */ \ \ /* H bit */ \ if (opts & MPPE_OPT_STATEFUL) \ *ptr++ = 0x0; \ else \ *ptr++ = MPPE_H_BIT; \ *ptr++ = 0; \ *ptr++ = 0; \ \ /* S,L bits */ \ *ptr = 0; \ if (opts & MPPE_OPT_128) \ *ptr |= MPPE_S_BIT; \ if (opts & MPPE_OPT_40) \ *ptr |= MPPE_L_BIT; \ /* M,D,C bits not supported */ \ } while (/* CONSTCOND */ 0) /* The reverse of the above */ #define MPPE_CI_TO_OPTS(ci, opts) \ do { \ u_char *ptr = ci; /* u_char[4] */ \ \ opts = 0; \ \ /* H bit */ \ if (!(ptr[0] & MPPE_H_BIT)) \ opts |= MPPE_OPT_STATEFUL; \ \ /* S,L bits */ \ if (ptr[3] & MPPE_S_BIT) \ opts |= MPPE_OPT_128; \ if (ptr[3] & MPPE_L_BIT) \ opts |= MPPE_OPT_40; \ \ /* M,D,C bits */ \ if (ptr[3] & MPPE_M_BIT) \ opts |= MPPE_OPT_56; \ if (ptr[3] & MPPE_D_BIT) \ opts |= MPPE_OPT_D; \ if (ptr[3] & MPPE_C_BIT) \ opts |= MPPE_OPT_MPPC; \ \ /* Other bits */ \ if (ptr[0] & ~MPPE_H_BIT) \ opts |= MPPE_OPT_UNKNOWN; \ if (ptr[1] || ptr[2]) \ opts |= MPPE_OPT_UNKNOWN; \ if (ptr[3] & ~MPPE_ALL_BITS) \ opts |= MPPE_OPT_UNKNOWN; \ } while (/* CONSTCOND */ 0)