1/*	$NetBSD: eui64.h,v 1.5 2021/01/09 16:39:28 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@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
39#ifndef __EUI64_H__
40#define __EUI64_H__
41
42#if !defined(INET6)
43#error	"this file should only be included when INET6 is defined"
44#endif /* not defined(INET6) */
45
46#if defined(SOL2)
47#include <netinet/in.h>
48
49typedef union {
50    uint8_t	e8[8];		/* lower 64-bit IPv6 address */
51    uint32_t	e32[2];		/* lower 64-bit IPv6 address */
52} eui64_t;
53
54/*
55 * Declare the two below, since in.h only defines them when _KERNEL
56 * is declared - which shouldn't be true when dealing with user-land programs
57 */
58#define	s6_addr8	_S6_un._S6_u8
59#define	s6_addr32	_S6_un._S6_u32
60
61#else /* else if not defined(SOL2) */
62
63/*
64 * TODO:
65 *
66 * Maybe this should be done by processing struct in6_addr directly...
67 */
68typedef union
69{
70    u_int8_t e8[8];
71    u_int16_t e16[4];
72    u_int32_t e32[2];
73} eui64_t;
74
75#endif /* defined(SOL2) */
76
77#define eui64_iszero(e)		(((e).e32[0] | (e).e32[1]) == 0)
78#define eui64_equals(e, o)	(((e).e32[0] == (o).e32[0]) && \
79				((e).e32[1] == (o).e32[1]))
80#define eui64_zero(e)		(e).e32[0] = (e).e32[1] = 0;
81
82#define eui64_copy(s, d)	memcpy(&(d), &(s), sizeof(eui64_t))
83
84#define eui64_magic(e)		do {			\
85				(e).e32[0] = magic();	\
86				(e).e32[1] = magic();	\
87				(e).e8[0] &= ~2;	\
88				} while (0)
89#define eui64_magic_nz(x)	do {				\
90				eui64_magic(x);			\
91				} while (eui64_iszero(x))
92#define eui64_magic_ne(x, y)	do {				\
93				eui64_magic(x);			\
94				} while (eui64_equals(x, y))
95
96#define eui64_get(ll, cp)	do {				\
97				eui64_copy((*cp), (ll));	\
98				(cp) += sizeof(eui64_t);	\
99				} while (0)
100
101#define eui64_put(ll, cp)	do {				\
102				eui64_copy((ll), (*cp));	\
103				(cp) += sizeof(eui64_t);	\
104				} while (0)
105
106#define eui64_set32(e, l)	do {			\
107				(e).e32[0] = 0;		\
108				(e).e32[1] = htonl(l);	\
109				} while (0)
110#define eui64_setlo32(e, l)	eui64_set32(e, l)
111
112char *eui64_ntoa(eui64_t);	/* Returns ascii representation of id */
113
114#endif /* __EUI64_H__ */
115
116