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eui64.h
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 #include "ppp_opts.h"
39 #if PPP_SUPPORT && PPP_IPV6_SUPPORT /* don't build if not configured for use in ppp_opts.h */
40 
41 #ifndef EUI64_H
42 #define EUI64_H
43 
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
47 
48 /*
49  * @todo:
50  *
51  * Maybe this should be done by processing struct in6_addr directly...
52  */
53 typedef union
54 {
55  u8_t e8[8];
56  u16_t e16[4];
57  u32_t e32[2];
58 } eui64_t;
59 
60 #define eui64_iszero(e) (((e).e32[0] | (e).e32[1]) == 0)
61 #define eui64_equals(e, o) (((e).e32[0] == (o).e32[0]) && \
62  ((e).e32[1] == (o).e32[1]))
63 #define eui64_zero(e) (e).e32[0] = (e).e32[1] = 0;
64 
65 #define eui64_copy(s, d) memcpy(&(d), &(s), sizeof(eui64_t))
66 
67 #define eui64_magic(e) do { \
68  (e).e32[0] = magic(); \
69  (e).e32[1] = magic(); \
70  (e).e8[0] &= ~2; \
71  } while (0)
72 #define eui64_magic_nz(x) do { \
73  eui64_magic(x); \
74  } while (eui64_iszero(x))
75 #define eui64_magic_ne(x, y) do { \
76  eui64_magic(x); \
77  } while (eui64_equals(x, y))
78 
79 #define eui64_get(ll, cp) do { \
80  eui64_copy((*cp), (ll)); \
81  (cp) += sizeof(eui64_t); \
82  } while (0)
83 
84 #define eui64_put(ll, cp) do { \
85  eui64_copy((ll), (*cp)); \
86  (cp) += sizeof(eui64_t); \
87  } while (0)
88 
89 #define eui64_set32(e, l) do { \
90  (e).e32[0] = 0; \
91  (e).e32[1] = ppp_htonl(l); \
92  } while (0)
93 #define eui64_setlo32(e, l) eui64_set32(e, l)
94 
95 char *eui64_ntoa(eui64_t); /* Returns ascii representation of id */
96 
97 #ifdef __cplusplus
98 }
99 #endif
100 
101 #endif /* EUI64_H */
102 #endif /* PPP_SUPPORT && PPP_IPV6_SUPPORT */
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