eui64.h

00001 /*
00002  * eui64.h - EUI64 routines for IPv6CP.
00003  *
00004  * Copyright (c) 1999 Tommi Komulainen.  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. Redistributions in binary form must reproduce the above copyright
00014  *    notice, this list of conditions and the following disclaimer in
00015  *    the documentation and/or other materials provided with the
00016  *    distribution.
00017  *
00018  * 3. The name(s) of the authors of this software must not be used to
00019  *    endorse or promote products derived from this software without
00020  *    prior written permission.
00021  *
00022  * 4. Redistributions of any form whatsoever must retain the following
00023  *    acknowledgment:
00024  *    "This product includes software developed by Tommi Komulainen
00025  *     <Tommi.Komulainen@iki.fi>".
00026  *
00027  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
00028  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
00029  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
00030  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
00031  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
00032  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
00033  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
00034  *
00035  * $Id: eui64.h,v 1.6 2002/12/04 23:03:32 paulus Exp $
00036 */
00037 
00038 #include "netif/ppp/ppp_opts.h"
00039 #if PPP_SUPPORT && PPP_IPV6_SUPPORT  /* don't build if not configured for use in lwipopts.h */
00040 
00041 #ifndef EUI64_H
00042 #define EUI64_H
00043 
00044 /*
00045  * @todo:
00046  *
00047  * Maybe this should be done by processing struct in6_addr directly...
00048  */
00049 typedef union
00050 {
00051     u8_t e8[8];
00052     u16_t e16[4];
00053     u32_t e32[2];
00054 } eui64_t;
00055 
00056 #define eui64_iszero(e)     (((e).e32[0] | (e).e32[1]) == 0)
00057 #define eui64_equals(e, o)  (((e).e32[0] == (o).e32[0]) && \
00058                 ((e).e32[1] == (o).e32[1]))
00059 #define eui64_zero(e)       (e).e32[0] = (e).e32[1] = 0;
00060 
00061 #define eui64_copy(s, d)    memcpy(&(d), &(s), sizeof(eui64_t))
00062 
00063 #define eui64_magic(e)      do {            \
00064                 (e).e32[0] = magic();   \
00065                 (e).e32[1] = magic();   \
00066                 (e).e8[0] &= ~2;    \
00067                 } while (0)
00068 #define eui64_magic_nz(x)   do {                \
00069                 eui64_magic(x);         \
00070                 } while (eui64_iszero(x))
00071 #define eui64_magic_ne(x, y)    do {                \
00072                 eui64_magic(x);         \
00073                 } while (eui64_equals(x, y))
00074 
00075 #define eui64_get(ll, cp)   do {                \
00076                 eui64_copy((*cp), (ll));    \
00077                 (cp) += sizeof(eui64_t);    \
00078                 } while (0)
00079 
00080 #define eui64_put(ll, cp)   do {                \
00081                 eui64_copy((ll), (*cp));    \
00082                 (cp) += sizeof(eui64_t);    \
00083                 } while (0)
00084 
00085 #define eui64_set32(e, l)   do {            \
00086                 (e).e32[0] = 0;     \
00087                 (e).e32[1] = lwip_htonl(l); \
00088                 } while (0)
00089 #define eui64_setlo32(e, l) eui64_set32(e, l)
00090 
00091 char *eui64_ntoa(eui64_t);  /* Returns ascii representation of id */
00092 
00093 #endif /* EUI64_H */
00094 #endif /* PPP_SUPPORT && PPP_IPV6_SUPPORT */