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718e3744 | 1 | /* |
2 | * Prefix structure. | |
3 | * Copyright (C) 1998 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #ifndef _ZEBRA_PREFIX_H | |
24 | #define _ZEBRA_PREFIX_H | |
25 | ||
8cc4198f | 26 | #include "sockunion.h" |
27 | ||
9d24baaa | 28 | /* |
29 | * A struct prefix contains an address family, a prefix length, and an | |
30 | * address. This can represent either a 'network prefix' as defined | |
31 | * by CIDR, where the 'host bits' of the prefix are 0 | |
32 | * (e.g. AF_INET:10.0.0.0/8), or an address and netmask | |
33 | * (e.g. AF_INET:10.0.0.9/8), such as might be configured on an | |
34 | * interface. | |
35 | */ | |
36 | ||
718e3744 | 37 | /* IPv4 and IPv6 unified prefix structure. */ |
38 | struct prefix | |
39 | { | |
40 | u_char family; | |
41 | u_char prefixlen; | |
42 | union | |
43 | { | |
44 | u_char prefix; | |
45 | struct in_addr prefix4; | |
46 | #ifdef HAVE_IPV6 | |
47 | struct in6_addr prefix6; | |
48 | #endif /* HAVE_IPV6 */ | |
49 | struct | |
50 | { | |
51 | struct in_addr id; | |
52 | struct in_addr adv_router; | |
53 | } lp; | |
54 | u_char val[8]; | |
55 | } u __attribute__ ((aligned (8))); | |
56 | }; | |
57 | ||
58 | /* IPv4 prefix structure. */ | |
59 | struct prefix_ipv4 | |
60 | { | |
61 | u_char family; | |
62 | u_char prefixlen; | |
63 | struct in_addr prefix __attribute__ ((aligned (8))); | |
64 | }; | |
65 | ||
66 | /* IPv6 prefix structure. */ | |
67 | #ifdef HAVE_IPV6 | |
68 | struct prefix_ipv6 | |
69 | { | |
70 | u_char family; | |
71 | u_char prefixlen; | |
72 | struct in6_addr prefix __attribute__ ((aligned (8))); | |
73 | }; | |
74 | #endif /* HAVE_IPV6 */ | |
75 | ||
76 | struct prefix_ls | |
77 | { | |
78 | u_char family; | |
79 | u_char prefixlen; | |
80 | struct in_addr id __attribute__ ((aligned (8))); | |
81 | struct in_addr adv_router; | |
82 | }; | |
83 | ||
84 | /* Prefix for routing distinguisher. */ | |
85 | struct prefix_rd | |
86 | { | |
87 | u_char family; | |
88 | u_char prefixlen; | |
89 | u_char val[8] __attribute__ ((aligned (8))); | |
90 | }; | |
91 | ||
92 | #ifndef INET_ADDRSTRLEN | |
93 | #define INET_ADDRSTRLEN 16 | |
94 | #endif /* INET_ADDRSTRLEN */ | |
95 | ||
96 | #ifndef INET6_ADDRSTRLEN | |
97 | #define INET6_ADDRSTRLEN 46 | |
98 | #endif /* INET6_ADDRSTRLEN */ | |
99 | ||
100 | #ifndef INET6_BUFSIZ | |
101 | #define INET6_BUFSIZ 51 | |
102 | #endif /* INET6_BUFSIZ */ | |
103 | ||
104 | /* Max bit/byte length of IPv4 address. */ | |
105 | #define IPV4_MAX_BYTELEN 4 | |
106 | #define IPV4_MAX_BITLEN 32 | |
107 | #define IPV4_MAX_PREFIXLEN 32 | |
108 | #define IPV4_ADDR_CMP(D,S) memcmp ((D), (S), IPV4_MAX_BYTELEN) | |
109 | #define IPV4_ADDR_SAME(D,S) (memcmp ((D), (S), IPV4_MAX_BYTELEN) == 0) | |
110 | #define IPV4_ADDR_COPY(D,S) memcpy ((D), (S), IPV4_MAX_BYTELEN) | |
111 | ||
112 | #define IPV4_NET0(a) ((((u_int32_t) (a)) & 0xff000000) == 0x00000000) | |
113 | #define IPV4_NET127(a) ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000) | |
6dc686a2 | 114 | #define IPV4_LINKLOCAL(a) ((((u_int32_t) (a)) & 0xffff0000) == 0xa9fe0000) |
733cd9e5 | 115 | #define IPV4_CLASS_DE(a) ((((u_int32_t) (a)) & 0xe0000000) == 0xe0000000) |
718e3744 | 116 | |
117 | /* Max bit/byte length of IPv6 address. */ | |
118 | #define IPV6_MAX_BYTELEN 16 | |
119 | #define IPV6_MAX_BITLEN 128 | |
120 | #define IPV6_MAX_PREFIXLEN 128 | |
121 | #define IPV6_ADDR_CMP(D,S) memcmp ((D), (S), IPV6_MAX_BYTELEN) | |
122 | #define IPV6_ADDR_SAME(D,S) (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0) | |
123 | #define IPV6_ADDR_COPY(D,S) memcpy ((D), (S), IPV6_MAX_BYTELEN) | |
124 | ||
125 | /* Count prefix size from mask length */ | |
126 | #define PSIZE(a) (((a) + 7) / (8)) | |
127 | ||
128 | /* Prefix's family member. */ | |
129 | #define PREFIX_FAMILY(p) ((p)->family) | |
130 | ||
1352ef32 SH |
131 | /* Check bit of the prefix. */ |
132 | static inline unsigned int | |
133 | prefix_bit (const u_char *prefix, const u_char prefixlen) | |
134 | { | |
135 | unsigned int offset = prefixlen / 8; | |
136 | unsigned int shift = 7 - (prefixlen % 8); | |
137 | ||
138 | return (prefix[offset] >> shift) & 1; | |
139 | } | |
140 | ||
813f6a00 SH |
141 | static inline unsigned int |
142 | prefix6_bit (const struct in6_addr *prefix, const u_char prefixlen) | |
143 | { | |
144 | return prefix_bit((const u_char *) &prefix->s6_addr, prefixlen); | |
145 | } | |
146 | ||
718e3744 | 147 | /* Prototypes. */ |
4c9641ba ML |
148 | extern int afi2family (afi_t); |
149 | extern afi_t family2afi (int); | |
8cc4198f | 150 | |
151 | extern struct prefix *prefix_new (void); | |
152 | extern void prefix_free (struct prefix *); | |
153 | extern const char *prefix_family_str (const struct prefix *); | |
154 | extern int prefix_blen (const struct prefix *); | |
155 | extern int str2prefix (const char *, struct prefix *); | |
156 | extern int prefix2str (const struct prefix *, char *, int); | |
157 | extern int prefix_match (const struct prefix *, const struct prefix *); | |
158 | extern int prefix_same (const struct prefix *, const struct prefix *); | |
159 | extern int prefix_cmp (const struct prefix *, const struct prefix *); | |
17e52061 | 160 | extern int prefix_common_bits (const struct prefix *, const struct prefix *); |
8cc4198f | 161 | extern void prefix_copy (struct prefix *dest, const struct prefix *src); |
162 | extern void apply_mask (struct prefix *); | |
163 | ||
164 | extern struct prefix *sockunion2prefix (const union sockunion *dest, | |
165 | const union sockunion *mask); | |
166 | extern struct prefix *sockunion2hostprefix (const union sockunion *); | |
17e52061 | 167 | extern void prefix2sockunion (const struct prefix *, union sockunion *); |
8cc4198f | 168 | |
169 | extern struct prefix_ipv4 *prefix_ipv4_new (void); | |
170 | extern void prefix_ipv4_free (struct prefix_ipv4 *); | |
171 | extern int str2prefix_ipv4 (const char *, struct prefix_ipv4 *); | |
172 | extern void apply_mask_ipv4 (struct prefix_ipv4 *); | |
173 | ||
e4529636 AS |
174 | #define PREFIX_COPY_IPV4(DST, SRC) \ |
175 | *((struct prefix_ipv4 *)(DST)) = *((const struct prefix_ipv4 *)(SRC)); | |
176 | ||
8cc4198f | 177 | extern int prefix_ipv4_any (const struct prefix_ipv4 *); |
178 | extern void apply_classful_mask_ipv4 (struct prefix_ipv4 *); | |
179 | ||
180 | extern u_char ip_masklen (struct in_addr); | |
9663386f | 181 | extern void masklen2ip (const int, struct in_addr *); |
3fb9cd6e | 182 | /* returns the network portion of the host address */ |
8cc4198f | 183 | extern in_addr_t ipv4_network_addr (in_addr_t hostaddr, int masklen); |
3fb9cd6e | 184 | /* given the address of a host on a network and the network mask length, |
185 | * calculate the broadcast address for that network; | |
186 | * special treatment for /31: returns the address of the other host | |
187 | * on the network by flipping the host bit */ | |
8cc4198f | 188 | extern in_addr_t ipv4_broadcast_addr (in_addr_t hostaddr, int masklen); |
3fb9cd6e | 189 | |
8cc4198f | 190 | extern int netmask_str2prefix_str (const char *, const char *, char *); |
718e3744 | 191 | |
192 | #ifdef HAVE_IPV6 | |
8cc4198f | 193 | extern struct prefix_ipv6 *prefix_ipv6_new (void); |
194 | extern void prefix_ipv6_free (struct prefix_ipv6 *); | |
195 | extern int str2prefix_ipv6 (const char *, struct prefix_ipv6 *); | |
196 | extern void apply_mask_ipv6 (struct prefix_ipv6 *); | |
718e3744 | 197 | |
e4529636 AS |
198 | #define PREFIX_COPY_IPV6(DST, SRC) \ |
199 | *((struct prefix_ipv6 *)(DST)) = *((const struct prefix_ipv6 *)(SRC)); | |
200 | ||
8cc4198f | 201 | extern int ip6_masklen (struct in6_addr); |
21f569e3 | 202 | extern void masklen2ip6 (const int, struct in6_addr *); |
b04c699e | 203 | |
8cc4198f | 204 | extern void str2in6_addr (const char *, struct in6_addr *); |
205 | extern const char *inet6_ntoa (struct in6_addr); | |
5920990f | 206 | |
b04c699e | 207 | #endif /* HAVE_IPV6 */ |
718e3744 | 208 | |
8cc4198f | 209 | extern int all_digit (const char *); |
718e3744 | 210 | |
211 | #endif /* _ZEBRA_PREFIX_H */ |