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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  */
36 #ifndef PPP_EUI64_H
37 #define PPP_EUI64_H
38
39 #include "pppdconf.h"
40
41 #if defined(SOL2)
42 #include <netinet/in.h>
43
44 typedef union {
45     uint8_t     e8[8];          /* lower 64-bit IPv6 address */
46     uint32_t    e32[2];         /* lower 64-bit IPv6 address */
47 } eui64_t;
48
49 /*
50  * Declare the two below, since in.h only defines them when _KERNEL
51  * is declared - which shouldn't be true when dealing with user-land programs
52  */
53 #define s6_addr8        _S6_un._S6_u8
54 #define s6_addr32       _S6_un._S6_u32
55
56 #else /* else if not defined(SOL2) */
57
58 /*
59  * TODO:
60  *
61  * Maybe this should be done by processing struct in6_addr directly...
62  */
63 typedef union
64 {
65     u_int8_t e8[8];
66     u_int16_t e16[4];
67     u_int32_t e32[2];
68 } eui64_t;
69
70 #endif /* defined(SOL2) */
71
72 #define eui64_iszero(e)         (((e).e32[0] | (e).e32[1]) == 0)
73 #define eui64_equals(e, o)      (((e).e32[0] == (o).e32[0]) && \
74                                 ((e).e32[1] == (o).e32[1]))
75 #define eui64_zero(e)           (e).e32[0] = (e).e32[1] = 0;
76
77 #define eui64_copy(s, d)        memcpy(&(d), &(s), sizeof(eui64_t))
78
79 #define eui64_magic(e)          do {                    \
80                                 (e).e32[0] = magic();   \
81                                 (e).e32[1] = magic();   \
82                                 (e).e8[0] &= ~2;        \
83                                 } while (0)
84 #define eui64_magic_nz(x)       do {                            \
85                                 eui64_magic(x);                 \
86                                 } while (eui64_iszero(x))
87 #define eui64_magic_ne(x, y)    do {                            \
88                                 eui64_magic(x);                 \
89                                 } while (eui64_equals(x, y))
90
91 #define eui64_get(ll, cp)       do {                            \
92                                 eui64_copy((*cp), (ll));        \
93                                 (cp) += sizeof(eui64_t);        \
94                                 } while (0)
95
96 #define eui64_put(ll, cp)       do {                            \
97                                 eui64_copy((ll), (*cp));        \
98                                 (cp) += sizeof(eui64_t);        \
99                                 } while (0)
100
101 #define eui64_set32(e, l)       do {                    \
102                                 (e).e32[0] = 0;         \
103                                 (e).e32[1] = htonl(l);  \
104                                 } while (0)
105 #define eui64_setlo32(e, l)     eui64_set32(e, l)
106
107 char *eui64_ntoa(eui64_t);      /* Returns ascii representation of id */
108
109 #endif /* PPP_EUI64_H */