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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 | ||
32ac65d9 LB |
26 | #ifdef SUNOS_5 |
27 | # include <sys/ethernet.h> | |
28 | #else | |
29 | # ifdef GNU_LINUX | |
30 | # include <net/ethernet.h> | |
31 | # else | |
32 | # include <netinet/if_ether.h> | |
33 | # endif | |
34 | #endif | |
8cc4198f | 35 | #include "sockunion.h" |
36 | ||
32ac65d9 LB |
37 | #ifndef ETHER_ADDR_LEN |
38 | #define ETHER_ADDR_LEN ETHERADDRL | |
39 | #endif | |
40 | ||
41 | /* | |
42 | * there isn't a portable ethernet address type. We define our | |
43 | * own to simplify internal handling | |
44 | */ | |
45 | struct ethaddr { | |
46 | u_char octet[ETHER_ADDR_LEN]; | |
47 | } __packed; | |
48 | ||
49 | ||
9d24baaa | 50 | /* |
51 | * A struct prefix contains an address family, a prefix length, and an | |
52 | * address. This can represent either a 'network prefix' as defined | |
53 | * by CIDR, where the 'host bits' of the prefix are 0 | |
54 | * (e.g. AF_INET:10.0.0.0/8), or an address and netmask | |
55 | * (e.g. AF_INET:10.0.0.9/8), such as might be configured on an | |
56 | * interface. | |
57 | */ | |
58 | ||
32ac65d9 LB |
59 | /* different OSes use different names */ |
60 | #if defined(AF_PACKET) | |
61 | #define AF_ETHERNET AF_PACKET | |
62 | #else | |
63 | #if defined(AF_LINK) | |
64 | #define AF_ETHERNET AF_LINK | |
65 | #endif | |
66 | #endif | |
67 | ||
718e3744 | 68 | /* IPv4 and IPv6 unified prefix structure. */ |
69 | struct prefix | |
70 | { | |
71 | u_char family; | |
72 | u_char prefixlen; | |
73 | union | |
74 | { | |
75 | u_char prefix; | |
76 | struct in_addr prefix4; | |
718e3744 | 77 | struct in6_addr prefix6; |
718e3744 | 78 | struct |
79 | { | |
80 | struct in_addr id; | |
81 | struct in_addr adv_router; | |
82 | } lp; | |
32ac65d9 | 83 | struct ethaddr prefix_eth; /* AF_ETHERNET */ |
718e3744 | 84 | u_char val[8]; |
b4b359a2 | 85 | uintptr_t ptr; |
718e3744 | 86 | } u __attribute__ ((aligned (8))); |
87 | }; | |
88 | ||
89 | /* IPv4 prefix structure. */ | |
90 | struct prefix_ipv4 | |
91 | { | |
92 | u_char family; | |
93 | u_char prefixlen; | |
94 | struct in_addr prefix __attribute__ ((aligned (8))); | |
95 | }; | |
96 | ||
97 | /* IPv6 prefix structure. */ | |
718e3744 | 98 | struct prefix_ipv6 |
99 | { | |
100 | u_char family; | |
101 | u_char prefixlen; | |
102 | struct in6_addr prefix __attribute__ ((aligned (8))); | |
103 | }; | |
718e3744 | 104 | |
105 | struct prefix_ls | |
106 | { | |
107 | u_char family; | |
108 | u_char prefixlen; | |
109 | struct in_addr id __attribute__ ((aligned (8))); | |
110 | struct in_addr adv_router; | |
111 | }; | |
112 | ||
113 | /* Prefix for routing distinguisher. */ | |
114 | struct prefix_rd | |
115 | { | |
116 | u_char family; | |
117 | u_char prefixlen; | |
118 | u_char val[8] __attribute__ ((aligned (8))); | |
119 | }; | |
120 | ||
32ac65d9 LB |
121 | /* Prefix for ethernet. */ |
122 | struct prefix_eth | |
123 | { | |
124 | u_char family; | |
125 | u_char prefixlen; | |
126 | struct ethaddr eth_addr __attribute__ ((aligned (8))); /* AF_ETHERNET */ | |
127 | }; | |
128 | ||
b4b359a2 PM |
129 | /* Prefix for a generic pointer */ |
130 | struct prefix_ptr | |
131 | { | |
132 | u_char family; | |
133 | u_char prefixlen; | |
134 | uintptr_t prefix __attribute__ ((aligned (8))); | |
135 | }; | |
136 | ||
f7bf4153 DL |
137 | /* helper to get type safety/avoid casts on calls |
138 | * (w/o this, functions accepting all prefix types need casts on the caller | |
139 | * side, which strips type safety since the cast will accept any pointer | |
140 | * type.) | |
141 | */ | |
142 | union prefix46ptr | |
143 | { | |
144 | struct prefix *p; | |
145 | struct prefix_ipv4 *p4; | |
146 | struct prefix_ipv6 *p6; | |
147 | } __attribute__ ((transparent_union)); | |
148 | ||
149 | union prefix46constptr | |
150 | { | |
151 | const struct prefix *p; | |
152 | const struct prefix_ipv4 *p4; | |
153 | const struct prefix_ipv6 *p6; | |
154 | } __attribute__ ((transparent_union)); | |
155 | ||
718e3744 | 156 | #ifndef INET_ADDRSTRLEN |
157 | #define INET_ADDRSTRLEN 16 | |
158 | #endif /* INET_ADDRSTRLEN */ | |
159 | ||
160 | #ifndef INET6_ADDRSTRLEN | |
161 | #define INET6_ADDRSTRLEN 46 | |
162 | #endif /* INET6_ADDRSTRLEN */ | |
163 | ||
164 | #ifndef INET6_BUFSIZ | |
165 | #define INET6_BUFSIZ 51 | |
166 | #endif /* INET6_BUFSIZ */ | |
167 | ||
855110bb TT |
168 | /* Maximum prefix string length (IPv6) */ |
169 | #define PREFIX_STRLEN 51 | |
170 | ||
718e3744 | 171 | /* Max bit/byte length of IPv4 address. */ |
172 | #define IPV4_MAX_BYTELEN 4 | |
173 | #define IPV4_MAX_BITLEN 32 | |
174 | #define IPV4_MAX_PREFIXLEN 32 | |
175 | #define IPV4_ADDR_CMP(D,S) memcmp ((D), (S), IPV4_MAX_BYTELEN) | |
176 | #define IPV4_ADDR_SAME(D,S) (memcmp ((D), (S), IPV4_MAX_BYTELEN) == 0) | |
177 | #define IPV4_ADDR_COPY(D,S) memcpy ((D), (S), IPV4_MAX_BYTELEN) | |
178 | ||
179 | #define IPV4_NET0(a) ((((u_int32_t) (a)) & 0xff000000) == 0x00000000) | |
180 | #define IPV4_NET127(a) ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000) | |
6dc686a2 | 181 | #define IPV4_LINKLOCAL(a) ((((u_int32_t) (a)) & 0xffff0000) == 0xa9fe0000) |
733cd9e5 | 182 | #define IPV4_CLASS_DE(a) ((((u_int32_t) (a)) & 0xe0000000) == 0xe0000000) |
718e3744 | 183 | |
184 | /* Max bit/byte length of IPv6 address. */ | |
185 | #define IPV6_MAX_BYTELEN 16 | |
186 | #define IPV6_MAX_BITLEN 128 | |
187 | #define IPV6_MAX_PREFIXLEN 128 | |
188 | #define IPV6_ADDR_CMP(D,S) memcmp ((D), (S), IPV6_MAX_BYTELEN) | |
189 | #define IPV6_ADDR_SAME(D,S) (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0) | |
190 | #define IPV6_ADDR_COPY(D,S) memcpy ((D), (S), IPV6_MAX_BYTELEN) | |
191 | ||
192 | /* Count prefix size from mask length */ | |
193 | #define PSIZE(a) (((a) + 7) / (8)) | |
194 | ||
195 | /* Prefix's family member. */ | |
196 | #define PREFIX_FAMILY(p) ((p)->family) | |
197 | ||
5c6ed111 DL |
198 | /* glibc defines s6_addr32 to __in6_u.__u6_addr32 if __USE_{MISC || GNU} */ |
199 | #ifndef s6_addr32 | |
200 | #if defined(SUNOS_5) | |
201 | /* Some SunOS define s6_addr32 only to kernel */ | |
202 | #define s6_addr32 _S6_un._S6_u32 | |
203 | #else | |
204 | #define s6_addr32 __u6_addr.__u6_addr32 | |
205 | #endif /* SUNOS_5 */ | |
206 | #endif /*s6_addr32*/ | |
207 | ||
718e3744 | 208 | /* Prototypes. */ |
f3ccedaa | 209 | extern int str2family(const char *); |
4c9641ba ML |
210 | extern int afi2family (afi_t); |
211 | extern afi_t family2afi (int); | |
1ec23d90 | 212 | extern const char *safi2str(safi_t safi); |
32ac65d9 | 213 | extern const char *afi2str(afi_t afi); |
8cc4198f | 214 | |
f63f06da PJ |
215 | /* Check bit of the prefix. */ |
216 | extern unsigned int prefix_bit (const u_char *prefix, const u_char prefixlen); | |
217 | extern unsigned int prefix6_bit (const struct in6_addr *prefix, const u_char prefixlen); | |
218 | ||
8cc4198f | 219 | extern struct prefix *prefix_new (void); |
220 | extern void prefix_free (struct prefix *); | |
221 | extern const char *prefix_family_str (const struct prefix *); | |
222 | extern int prefix_blen (const struct prefix *); | |
223 | extern int str2prefix (const char *, struct prefix *); | |
4690c7d7 DS |
224 | |
225 | /* | |
226 | * 8 groups of 4 bytes of hexadecimal + 7 seperators is 39 | |
227 | * /128 = 4 bytes | |
228 | * Null = 1 byte | |
229 | * 39 + 4 + 1 = 44 bytes | |
230 | */ | |
231 | #define PREFIX2STR_BUFFER 44 | |
78104b9b | 232 | extern const char *prefix2str (union prefix46constptr, char *, int); |
8cc4198f | 233 | extern int prefix_match (const struct prefix *, const struct prefix *); |
234 | extern int prefix_same (const struct prefix *, const struct prefix *); | |
235 | extern int prefix_cmp (const struct prefix *, const struct prefix *); | |
17e52061 | 236 | extern int prefix_common_bits (const struct prefix *, const struct prefix *); |
8cc4198f | 237 | extern void prefix_copy (struct prefix *dest, const struct prefix *src); |
238 | extern void apply_mask (struct prefix *); | |
239 | ||
240 | extern struct prefix *sockunion2prefix (const union sockunion *dest, | |
241 | const union sockunion *mask); | |
40ee54a7 | 242 | extern struct prefix *sockunion2hostprefix (const union sockunion *, struct prefix *p); |
17e52061 | 243 | extern void prefix2sockunion (const struct prefix *, union sockunion *); |
8cc4198f | 244 | |
32ac65d9 LB |
245 | extern int str2prefix_eth (const char *, struct prefix_eth *); |
246 | ||
8cc4198f | 247 | extern struct prefix_ipv4 *prefix_ipv4_new (void); |
248 | extern void prefix_ipv4_free (struct prefix_ipv4 *); | |
249 | extern int str2prefix_ipv4 (const char *, struct prefix_ipv4 *); | |
250 | extern void apply_mask_ipv4 (struct prefix_ipv4 *); | |
251 | ||
e4529636 AS |
252 | #define PREFIX_COPY_IPV4(DST, SRC) \ |
253 | *((struct prefix_ipv4 *)(DST)) = *((const struct prefix_ipv4 *)(SRC)); | |
254 | ||
8cc4198f | 255 | extern int prefix_ipv4_any (const struct prefix_ipv4 *); |
256 | extern void apply_classful_mask_ipv4 (struct prefix_ipv4 *); | |
257 | ||
258 | extern u_char ip_masklen (struct in_addr); | |
9663386f | 259 | extern void masklen2ip (const int, struct in_addr *); |
3fb9cd6e | 260 | /* returns the network portion of the host address */ |
8cc4198f | 261 | extern in_addr_t ipv4_network_addr (in_addr_t hostaddr, int masklen); |
3fb9cd6e | 262 | /* given the address of a host on a network and the network mask length, |
263 | * calculate the broadcast address for that network; | |
264 | * special treatment for /31: returns the address of the other host | |
265 | * on the network by flipping the host bit */ | |
8cc4198f | 266 | extern in_addr_t ipv4_broadcast_addr (in_addr_t hostaddr, int masklen); |
3fb9cd6e | 267 | |
8cc4198f | 268 | extern int netmask_str2prefix_str (const char *, const char *, char *); |
718e3744 | 269 | |
8cc4198f | 270 | extern struct prefix_ipv6 *prefix_ipv6_new (void); |
271 | extern void prefix_ipv6_free (struct prefix_ipv6 *); | |
272 | extern int str2prefix_ipv6 (const char *, struct prefix_ipv6 *); | |
273 | extern void apply_mask_ipv6 (struct prefix_ipv6 *); | |
718e3744 | 274 | |
e4529636 AS |
275 | #define PREFIX_COPY_IPV6(DST, SRC) \ |
276 | *((struct prefix_ipv6 *)(DST)) = *((const struct prefix_ipv6 *)(SRC)); | |
277 | ||
8cc4198f | 278 | extern int ip6_masklen (struct in6_addr); |
21f569e3 | 279 | extern void masklen2ip6 (const int, struct in6_addr *); |
b04c699e | 280 | |
8cc4198f | 281 | extern void str2in6_addr (const char *, struct in6_addr *); |
282 | extern const char *inet6_ntoa (struct in6_addr); | |
5920990f | 283 | |
d914d5ff DS |
284 | static inline int ipv6_martian (struct in6_addr *addr) |
285 | { | |
286 | struct in6_addr localhost_addr; | |
287 | ||
288 | inet_pton (AF_INET6, "::1", &localhost_addr); | |
289 | ||
290 | if (IPV6_ADDR_SAME(&localhost_addr, addr)) | |
291 | return 1; | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
8cc4198f | 296 | extern int all_digit (const char *); |
718e3744 | 297 | |
d914d5ff | 298 | /* NOTE: This routine expects the address argument in network byte order. */ |
6ee06fa9 PM |
299 | static inline int ipv4_martian (struct in_addr *addr) |
300 | { | |
d914d5ff | 301 | in_addr_t ip = ntohl(addr->s_addr); |
6ee06fa9 PM |
302 | |
303 | if (IPV4_NET0(ip) || IPV4_NET127(ip) || IPV4_CLASS_DE(ip)) { | |
304 | return 1; | |
305 | } | |
306 | return 0; | |
307 | } | |
308 | ||
18ff3edd DS |
309 | static inline int |
310 | is_default_prefix (struct prefix *p) | |
311 | { | |
312 | if (!p) | |
313 | return 0; | |
314 | ||
315 | if (((p->family == AF_INET) && (p->u.prefix4.s_addr == INADDR_ANY)) | |
316 | || ((p->family == AF_INET6) && | |
317 | !memcmp(&p->u.prefix6, &in6addr_any, sizeof (struct in6_addr)))) | |
318 | return 1; | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
718e3744 | 323 | #endif /* _ZEBRA_PREFIX_H */ |