ipv6.h revision 290001 
1/*
2 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2002  Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id: ipv6.h,v 1.24 2007/06/19 23:47:18 tbox Exp $ */
19
20#ifndef ISC_IPV6_H
21#define ISC_IPV6_H 1
22
23/*!
24 * Also define LWRES_IPV6_H to keep it from being included if liblwres is
25 * being used, or redefinition errors will occur.
26 */
27#define LWRES_IPV6_H 1
28
29/*****
30 ***** Module Info
31 *****/
32
33/*! \file isc/ipv6.h
34 * \brief IPv6 definitions for systems which do not support IPv6.
35 *
36 * \li MP:
37 *	No impact.
38 *
39 * \li Reliability:
40 *	No anticipated impact.
41 *
42 * \li Resources:
43 *	N/A.
44 *
45 * \li Security:
46 *	No anticipated impact.
47 *
48 * \li Standards:
49 *	RFC2553.
50 */
51
52/***
53 *** Imports.
54 ***/
55
56#include <isc/int.h>
57#include <isc/platform.h>
58
59/***
60 *** Types.
61 ***/
62
63struct in6_addr {
64        union {
65		isc_uint8_t	_S6_u8[16];
66		isc_uint16_t	_S6_u16[8];
67		isc_uint32_t	_S6_u32[4];
68        } _S6_un;
69};
70#define s6_addr		_S6_un._S6_u8
71#define s6_addr8	_S6_un._S6_u8
72#define s6_addr16	_S6_un._S6_u16
73#define s6_addr32	_S6_un._S6_u32
74
75#define IN6ADDR_ANY_INIT 	{{{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }}}
76#define IN6ADDR_LOOPBACK_INIT 	{{{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 }}}
77
78LIBISC_EXTERNAL_DATA extern const struct in6_addr in6addr_any;
79LIBISC_EXTERNAL_DATA extern const struct in6_addr in6addr_loopback;
80
81struct sockaddr_in6 {
82#ifdef ISC_PLATFORM_HAVESALEN
83	isc_uint8_t		sin6_len;
84	isc_uint8_t		sin6_family;
85#else
86	isc_uint16_t		sin6_family;
87#endif
88	isc_uint16_t		sin6_port;
89	isc_uint32_t		sin6_flowinfo;
90	struct in6_addr		sin6_addr;
91	isc_uint32_t		sin6_scope_id;
92};
93
94#ifdef ISC_PLATFORM_HAVESALEN
95#define SIN6_LEN 1
96#endif
97
98/*%
99 * Unspecified
100 */
101#define IN6_IS_ADDR_UNSPECIFIED(a)      \
102        (((a)->s6_addr32[0] == 0) &&    \
103         ((a)->s6_addr32[1] == 0) &&    \
104         ((a)->s6_addr32[2] == 0) &&    \
105         ((a)->s6_addr32[3] == 0))
106
107/*%
108 * Loopback
109 */
110#define IN6_IS_ADDR_LOOPBACK(a)         \
111        (((a)->s6_addr32[0] == 0) &&    \
112         ((a)->s6_addr32[1] == 0) &&    \
113         ((a)->s6_addr32[2] == 0) &&    \
114         ((a)->s6_addr32[3] == htonl(1)))
115
116/*%
117 * IPv4 compatible
118 */
119#define IN6_IS_ADDR_V4COMPAT(a)         \
120        (((a)->s6_addr32[0] == 0) &&    \
121         ((a)->s6_addr32[1] == 0) &&    \
122         ((a)->s6_addr32[2] == 0) &&    \
123         ((a)->s6_addr32[3] != 0) &&    \
124         ((a)->s6_addr32[3] != htonl(1)))
125
126/*%
127 * Mapped
128 */
129#define IN6_IS_ADDR_V4MAPPED(a)               \
130        (((a)->s6_addr32[0] == 0) &&          \
131         ((a)->s6_addr32[1] == 0) &&          \
132         ((a)->s6_addr32[2] == htonl(0x0000ffff)))
133
134/*%
135 * Multicast
136 */
137#define IN6_IS_ADDR_MULTICAST(a)	\
138	((a)->s6_addr8[0] == 0xffU)
139
140/*%
141 * Unicast link / site local.
142 */
143#define IN6_IS_ADDR_LINKLOCAL(a)	\
144	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))
145#define IN6_IS_ADDR_SITELOCAL(a)	\
146	(((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0xc0))
147
148#endif /* ISC_IPV6_H */
149