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      1 /*	$NetBSD: eui64.h,v 1.6 2025/01/08 19:59:39 christos Exp $	*/
      2 
      3 /*
      4  * eui64.h - EUI64 routines for IPv6CP.
      5  *
      6  * Copyright (c) 1999 Tommi Komulainen.  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 Tommi Komulainen
     27  *     <Tommi.Komulainen (at) iki.fi>".
     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 #ifndef PPP_EUI64_H
     39 #define PPP_EUI64_H
     40 
     41 #include "pppdconf.h"
     42 
     43 #ifdef __cplusplus
     44 extern "C" {
     45 #endif
     46 
     47 #if defined(SOL2)
     48 #include <netinet/in.h>
     49 
     50 typedef union {
     51     uint8_t	e8[8];		/* lower 64-bit IPv6 address */
     52     uint32_t	e32[2];		/* lower 64-bit IPv6 address */
     53 } eui64_t;
     54 
     55 /*
     56  * Declare the two below, since in.h only defines them when _KERNEL
     57  * is declared - which shouldn't be true when dealing with user-land programs
     58  */
     59 #define	s6_addr8	_S6_un._S6_u8
     60 #define	s6_addr32	_S6_un._S6_u32
     61 
     62 #else /* else if not defined(SOL2) */
     63 
     64 /*
     65  * TODO:
     66  *
     67  * Maybe this should be done by processing struct in6_addr directly...
     68  */
     69 typedef union
     70 {
     71     u_int8_t e8[8];
     72     u_int16_t e16[4];
     73     u_int32_t e32[2];
     74 } eui64_t;
     75 
     76 #endif /* defined(SOL2) */
     77 
     78 #define eui64_iszero(e)		(((e).e32[0] | (e).e32[1]) == 0)
     79 #define eui64_equals(e, o)	(((e).e32[0] == (o).e32[0]) && \
     80 				((e).e32[1] == (o).e32[1]))
     81 #define eui64_zero(e)		(e).e32[0] = (e).e32[1] = 0;
     82 
     83 #define eui64_copy(s, d)	memcpy(&(d), &(s), sizeof(eui64_t))
     84 
     85 #define eui64_magic(e)		do {			\
     86 				(e).e32[0] = magic();	\
     87 				(e).e32[1] = magic();	\
     88 				(e).e8[0] &= ~2;	\
     89 				} while (0)
     90 #define eui64_magic_nz(x)	do {				\
     91 				eui64_magic(x);			\
     92 				} while (eui64_iszero(x))
     93 #define eui64_magic_ne(x, y)	do {				\
     94 				eui64_magic(x);			\
     95 				} while (eui64_equals(x, y))
     96 
     97 #define eui64_get(ll, cp)	do {				\
     98 				eui64_copy((*cp), (ll));	\
     99 				(cp) += sizeof(eui64_t);	\
    100 				} while (0)
    101 
    102 #define eui64_put(ll, cp)	do {				\
    103 				eui64_copy((ll), (*cp));	\
    104 				(cp) += sizeof(eui64_t);	\
    105 				} while (0)
    106 
    107 #define eui64_set32(e, l)	do {			\
    108 				(e).e32[0] = 0;		\
    109 				(e).e32[1] = htonl(l);	\
    110 				} while (0)
    111 #define eui64_setlo32(e, l)	eui64_set32(e, l)
    112 
    113 char *eui64_ntoa(eui64_t);	/* Returns ascii representation of id */
    114 
    115 #ifdef __cplusplus
    116 }
    117 #endif
    118 
    119 #endif /* PPP_EUI64_H */
    120