1 /*
2  * eui64.h - EUI64 routines for IPv6CP.
3  *
4  * Copyright (c) 1999 Tommi Komulainen.  All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in
15  *    the documentation and/or other materials provided with the
16  *    distribution.
17  *
18  * 3. The name(s) of the authors of this software must not be used to
19  *    endorse or promote products derived from this software without
20  *    prior written permission.
21  *
22  * 4. Redistributions of any form whatsoever must retain the following
23  *    acknowledgment:
24  *    "This product includes software developed by Tommi Komulainen
25  *     <Tommi.Komulainen@iki.fi>".
26  *
27  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
28  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
29  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
30  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
31  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
32  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
33  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
34  *
35  * $Id: eui64.h,v 1.6 2002/12/04 23:03:32 paulus Exp $
36 */
37 
38 #ifndef __EUI64_H__
39 #define __EUI64_H__
40 
41 #if !defined(INET6)
42 #error	"this file should only be included when INET6 is defined"
43 #endif /* not defined(INET6) */
44 
45 #if defined(SOL2)
46 #include <netinet/in.h>
47 
48 typedef union {
49     uint8_t	e8[8];		/* lower 64-bit IPv6 address */
50     uint32_t	e32[2];		/* lower 64-bit IPv6 address */
51 } eui64_t;
52 
53 /*
54  * Declare the two below, since in.h only defines them when _KERNEL
55  * is declared - which shouldn't be true when dealing with user-land programs
56  */
57 #define	s6_addr8	_S6_un._S6_u8
58 #define	s6_addr32	_S6_un._S6_u32
59 
60 #else /* else if not defined(SOL2) */
61 
62 /*
63  * TODO:
64  *
65  * Maybe this should be done by processing struct in6_addr directly...
66  */
67 typedef union
68 {
69     u_int8_t e8[8];
70     u_int16_t e16[4];
71     u_int32_t e32[2];
72 } eui64_t;
73 
74 #endif /* defined(SOL2) */
75 
76 #define eui64_iszero(e)		(((e).e32[0] | (e).e32[1]) == 0)
77 #define eui64_equals(e, o)	(((e).e32[0] == (o).e32[0]) && \
78 				((e).e32[1] == (o).e32[1]))
79 #define eui64_zero(e)		(e).e32[0] = (e).e32[1] = 0;
80 
81 #define eui64_copy(s, d)	memcpy(&(d), &(s), sizeof(eui64_t))
82 
83 #define eui64_magic(e)		do {			\
84 				(e).e32[0] = magic();	\
85 				(e).e32[1] = magic();	\
86 				(e).e8[0] &= ~2;	\
87 				} while (0)
88 #define eui64_magic_nz(x)	do {				\
89 				eui64_magic(x);			\
90 				} while (eui64_iszero(x))
91 #define eui64_magic_ne(x, y)	do {				\
92 				eui64_magic(x);			\
93 				} while (eui64_equals(x, y))
94 
95 #define eui64_get(ll, cp)	do {				\
96 				eui64_copy((*cp), (ll));	\
97 				(cp) += sizeof(eui64_t);	\
98 				} while (0)
99 
100 #define eui64_put(ll, cp)	do {				\
101 				eui64_copy((ll), (*cp));	\
102 				(cp) += sizeof(eui64_t);	\
103 				} while (0)
104 
105 #define eui64_set32(e, l)	do {			\
106 				(e).e32[0] = 0;		\
107 				(e).e32[1] = htonl(l);	\
108 				} while (0)
109 #define eui64_setlo32(e, l)	eui64_set32(e, l)
110 
111 char *eui64_ntoa __P((eui64_t));	/* Returns ascii representation of id */
112 
113 #endif /* __EUI64_H__ */
114 
115