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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 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #ifndef _ZEBRA_PREFIX_H | |
23 | #define _ZEBRA_PREFIX_H | |
24 | ||
32ac65d9 LB |
25 | #ifdef SUNOS_5 |
26 | # include <sys/ethernet.h> | |
27 | #else | |
28 | # ifdef GNU_LINUX | |
29 | # include <net/ethernet.h> | |
30 | # else | |
31 | # include <netinet/if_ether.h> | |
32 | # endif | |
33 | #endif | |
8cc4198f | 34 | #include "sockunion.h" |
35 | ||
32ac65d9 | 36 | #ifndef ETHER_ADDR_LEN |
c215ecaf | 37 | #ifdef ETHERADDRL |
32ac65d9 | 38 | #define ETHER_ADDR_LEN ETHERADDRL |
c215ecaf PG |
39 | #else |
40 | #define ETHER_ADDR_LEN 6 | |
41 | #endif | |
32ac65d9 LB |
42 | #endif |
43 | ||
c215ecaf | 44 | #define ETHER_ADDR_STRLEN (3*ETHER_ADDR_LEN) |
32ac65d9 LB |
45 | /* |
46 | * there isn't a portable ethernet address type. We define our | |
47 | * own to simplify internal handling | |
48 | */ | |
49 | struct ethaddr { | |
50 | u_char octet[ETHER_ADDR_LEN]; | |
79c0c959 | 51 | } __attribute__ ((packed)); |
32ac65d9 LB |
52 | |
53 | ||
a440846e | 54 | /* length is the number of valuable bits of prefix structure |
55 | * 18 bytes is current length in structure, if address is ipv4 | |
56 | * 30 bytes is in case of ipv6 | |
57 | */ | |
58 | #define PREFIX_LEN_ROUTE_TYPE_5_IPV4 (18*8) | |
59 | #define PREFIX_LEN_ROUTE_TYPE_5_IPV6 (30*8) | |
60 | ||
61 | /* EVPN address (RFC 7432) */ | |
62 | struct evpn_addr | |
63 | { | |
64 | u_char route_type; | |
65 | u_char flags; | |
66 | #define IP_ADDR_NONE 0x0 | |
67 | #define IP_ADDR_V4 0x1 | |
68 | #define IP_ADDR_V6 0x2 | |
4470c22c PG |
69 | #define IP_PREFIX_V4 0x4 |
70 | #define IP_PREFIX_V6 0x8 | |
a440846e | 71 | struct ethaddr mac; |
72 | uint32_t eth_tag; | |
73 | u_char ip_prefix_length; | |
74 | union | |
75 | { | |
78b81eaa | 76 | u_char addr; |
a440846e | 77 | struct in_addr v4_addr; |
78 | struct in6_addr v6_addr; | |
79 | } ip; | |
80 | }; | |
81 | ||
82 | /* EVPN prefix structure. */ | |
83 | struct prefix_evpn | |
84 | { | |
85 | u_char family; | |
86 | u_char prefixlen; | |
87 | struct evpn_addr prefix __attribute__ ((aligned (8))); | |
88 | }; | |
89 | ||
9d24baaa | 90 | /* |
91 | * A struct prefix contains an address family, a prefix length, and an | |
92 | * address. This can represent either a 'network prefix' as defined | |
93 | * by CIDR, where the 'host bits' of the prefix are 0 | |
94 | * (e.g. AF_INET:10.0.0.0/8), or an address and netmask | |
95 | * (e.g. AF_INET:10.0.0.9/8), such as might be configured on an | |
96 | * interface. | |
97 | */ | |
98 | ||
32ac65d9 LB |
99 | /* different OSes use different names */ |
100 | #if defined(AF_PACKET) | |
101 | #define AF_ETHERNET AF_PACKET | |
102 | #else | |
103 | #if defined(AF_LINK) | |
104 | #define AF_ETHERNET AF_LINK | |
105 | #endif | |
106 | #endif | |
107 | ||
718e3744 | 108 | /* IPv4 and IPv6 unified prefix structure. */ |
109 | struct prefix | |
110 | { | |
111 | u_char family; | |
112 | u_char prefixlen; | |
113 | union | |
114 | { | |
115 | u_char prefix; | |
116 | struct in_addr prefix4; | |
718e3744 | 117 | struct in6_addr prefix6; |
718e3744 | 118 | struct |
119 | { | |
120 | struct in_addr id; | |
121 | struct in_addr adv_router; | |
122 | } lp; | |
32ac65d9 | 123 | struct ethaddr prefix_eth; /* AF_ETHERNET */ |
718e3744 | 124 | u_char val[8]; |
b4b359a2 | 125 | uintptr_t ptr; |
a440846e | 126 | struct evpn_addr prefix_evpn; |
718e3744 | 127 | } u __attribute__ ((aligned (8))); |
128 | }; | |
129 | ||
130 | /* IPv4 prefix structure. */ | |
131 | struct prefix_ipv4 | |
132 | { | |
133 | u_char family; | |
134 | u_char prefixlen; | |
135 | struct in_addr prefix __attribute__ ((aligned (8))); | |
136 | }; | |
137 | ||
138 | /* IPv6 prefix structure. */ | |
718e3744 | 139 | struct prefix_ipv6 |
140 | { | |
141 | u_char family; | |
142 | u_char prefixlen; | |
143 | struct in6_addr prefix __attribute__ ((aligned (8))); | |
144 | }; | |
718e3744 | 145 | |
146 | struct prefix_ls | |
147 | { | |
148 | u_char family; | |
149 | u_char prefixlen; | |
150 | struct in_addr id __attribute__ ((aligned (8))); | |
151 | struct in_addr adv_router; | |
152 | }; | |
153 | ||
154 | /* Prefix for routing distinguisher. */ | |
155 | struct prefix_rd | |
156 | { | |
157 | u_char family; | |
158 | u_char prefixlen; | |
159 | u_char val[8] __attribute__ ((aligned (8))); | |
160 | }; | |
161 | ||
32ac65d9 LB |
162 | /* Prefix for ethernet. */ |
163 | struct prefix_eth | |
164 | { | |
165 | u_char family; | |
166 | u_char prefixlen; | |
167 | struct ethaddr eth_addr __attribute__ ((aligned (8))); /* AF_ETHERNET */ | |
168 | }; | |
169 | ||
b4b359a2 PM |
170 | /* Prefix for a generic pointer */ |
171 | struct prefix_ptr | |
172 | { | |
173 | u_char family; | |
174 | u_char prefixlen; | |
175 | uintptr_t prefix __attribute__ ((aligned (8))); | |
176 | }; | |
177 | ||
e9219290 DS |
178 | struct prefix_sg |
179 | { | |
180 | u_char family; | |
181 | u_char prefixlen; | |
5662e2c9 | 182 | struct in_addr src __attribute__ ((aligned (8))); |
e9219290 DS |
183 | struct in_addr grp; |
184 | }; | |
185 | ||
f7bf4153 DL |
186 | /* helper to get type safety/avoid casts on calls |
187 | * (w/o this, functions accepting all prefix types need casts on the caller | |
188 | * side, which strips type safety since the cast will accept any pointer | |
189 | * type.) | |
190 | */ | |
78b81eaa | 191 | union prefixptr |
f7bf4153 DL |
192 | { |
193 | struct prefix *p; | |
194 | struct prefix_ipv4 *p4; | |
195 | struct prefix_ipv6 *p6; | |
78b81eaa | 196 | struct prefix_evpn *evp; |
f7bf4153 DL |
197 | } __attribute__ ((transparent_union)); |
198 | ||
78b81eaa | 199 | union prefixconstptr |
f7bf4153 DL |
200 | { |
201 | const struct prefix *p; | |
202 | const struct prefix_ipv4 *p4; | |
203 | const struct prefix_ipv6 *p6; | |
78b81eaa | 204 | const struct prefix_evpn *evp; |
f7bf4153 DL |
205 | } __attribute__ ((transparent_union)); |
206 | ||
718e3744 | 207 | #ifndef INET_ADDRSTRLEN |
208 | #define INET_ADDRSTRLEN 16 | |
209 | #endif /* INET_ADDRSTRLEN */ | |
210 | ||
211 | #ifndef INET6_ADDRSTRLEN | |
212 | #define INET6_ADDRSTRLEN 46 | |
213 | #endif /* INET6_ADDRSTRLEN */ | |
214 | ||
215 | #ifndef INET6_BUFSIZ | |
216 | #define INET6_BUFSIZ 51 | |
217 | #endif /* INET6_BUFSIZ */ | |
218 | ||
855110bb TT |
219 | /* Maximum prefix string length (IPv6) */ |
220 | #define PREFIX_STRLEN 51 | |
221 | ||
718e3744 | 222 | /* Max bit/byte length of IPv4 address. */ |
223 | #define IPV4_MAX_BYTELEN 4 | |
224 | #define IPV4_MAX_BITLEN 32 | |
225 | #define IPV4_MAX_PREFIXLEN 32 | |
226 | #define IPV4_ADDR_CMP(D,S) memcmp ((D), (S), IPV4_MAX_BYTELEN) | |
227 | #define IPV4_ADDR_SAME(D,S) (memcmp ((D), (S), IPV4_MAX_BYTELEN) == 0) | |
228 | #define IPV4_ADDR_COPY(D,S) memcpy ((D), (S), IPV4_MAX_BYTELEN) | |
229 | ||
230 | #define IPV4_NET0(a) ((((u_int32_t) (a)) & 0xff000000) == 0x00000000) | |
231 | #define IPV4_NET127(a) ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000) | |
6dc686a2 | 232 | #define IPV4_LINKLOCAL(a) ((((u_int32_t) (a)) & 0xffff0000) == 0xa9fe0000) |
733cd9e5 | 233 | #define IPV4_CLASS_DE(a) ((((u_int32_t) (a)) & 0xe0000000) == 0xe0000000) |
718e3744 | 234 | |
235 | /* Max bit/byte length of IPv6 address. */ | |
236 | #define IPV6_MAX_BYTELEN 16 | |
237 | #define IPV6_MAX_BITLEN 128 | |
238 | #define IPV6_MAX_PREFIXLEN 128 | |
239 | #define IPV6_ADDR_CMP(D,S) memcmp ((D), (S), IPV6_MAX_BYTELEN) | |
240 | #define IPV6_ADDR_SAME(D,S) (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0) | |
241 | #define IPV6_ADDR_COPY(D,S) memcpy ((D), (S), IPV6_MAX_BYTELEN) | |
242 | ||
243 | /* Count prefix size from mask length */ | |
244 | #define PSIZE(a) (((a) + 7) / (8)) | |
245 | ||
cd1964ff DS |
246 | #define BSIZE(a) ((a) * (8)) |
247 | ||
718e3744 | 248 | /* Prefix's family member. */ |
249 | #define PREFIX_FAMILY(p) ((p)->family) | |
250 | ||
5c6ed111 DL |
251 | /* glibc defines s6_addr32 to __in6_u.__u6_addr32 if __USE_{MISC || GNU} */ |
252 | #ifndef s6_addr32 | |
253 | #if defined(SUNOS_5) | |
254 | /* Some SunOS define s6_addr32 only to kernel */ | |
255 | #define s6_addr32 _S6_un._S6_u32 | |
256 | #else | |
257 | #define s6_addr32 __u6_addr.__u6_addr32 | |
258 | #endif /* SUNOS_5 */ | |
259 | #endif /*s6_addr32*/ | |
260 | ||
718e3744 | 261 | /* Prototypes. */ |
f3ccedaa | 262 | extern int str2family(const char *); |
4c9641ba ML |
263 | extern int afi2family (afi_t); |
264 | extern afi_t family2afi (int); | |
1ec23d90 | 265 | extern const char *safi2str(safi_t safi); |
32ac65d9 | 266 | extern const char *afi2str(afi_t afi); |
8cc4198f | 267 | |
f63f06da PJ |
268 | /* Check bit of the prefix. */ |
269 | extern unsigned int prefix_bit (const u_char *prefix, const u_char prefixlen); | |
270 | extern unsigned int prefix6_bit (const struct in6_addr *prefix, const u_char prefixlen); | |
271 | ||
8cc4198f | 272 | extern struct prefix *prefix_new (void); |
273 | extern void prefix_free (struct prefix *); | |
274 | extern const char *prefix_family_str (const struct prefix *); | |
275 | extern int prefix_blen (const struct prefix *); | |
276 | extern int str2prefix (const char *, struct prefix *); | |
4690c7d7 | 277 | |
a9ea959f | 278 | #define PREFIX2STR_BUFFER PREFIX_STRLEN |
279 | ||
78b81eaa | 280 | extern const char *prefix2str (union prefixconstptr, char *, int); |
8cc4198f | 281 | extern int prefix_match (const struct prefix *, const struct prefix *); |
282 | extern int prefix_same (const struct prefix *, const struct prefix *); | |
283 | extern int prefix_cmp (const struct prefix *, const struct prefix *); | |
17e52061 | 284 | extern int prefix_common_bits (const struct prefix *, const struct prefix *); |
8cc4198f | 285 | extern void prefix_copy (struct prefix *dest, const struct prefix *src); |
286 | extern void apply_mask (struct prefix *); | |
287 | ||
288 | extern struct prefix *sockunion2prefix (const union sockunion *dest, | |
289 | const union sockunion *mask); | |
40ee54a7 | 290 | extern struct prefix *sockunion2hostprefix (const union sockunion *, struct prefix *p); |
17e52061 | 291 | extern void prefix2sockunion (const struct prefix *, union sockunion *); |
8cc4198f | 292 | |
32ac65d9 LB |
293 | extern int str2prefix_eth (const char *, struct prefix_eth *); |
294 | ||
8cc4198f | 295 | extern struct prefix_ipv4 *prefix_ipv4_new (void); |
296 | extern void prefix_ipv4_free (struct prefix_ipv4 *); | |
297 | extern int str2prefix_ipv4 (const char *, struct prefix_ipv4 *); | |
298 | extern void apply_mask_ipv4 (struct prefix_ipv4 *); | |
299 | ||
e4529636 AS |
300 | #define PREFIX_COPY_IPV4(DST, SRC) \ |
301 | *((struct prefix_ipv4 *)(DST)) = *((const struct prefix_ipv4 *)(SRC)); | |
302 | ||
8cc4198f | 303 | extern int prefix_ipv4_any (const struct prefix_ipv4 *); |
304 | extern void apply_classful_mask_ipv4 (struct prefix_ipv4 *); | |
305 | ||
306 | extern u_char ip_masklen (struct in_addr); | |
9663386f | 307 | extern void masklen2ip (const int, struct in_addr *); |
3fb9cd6e | 308 | /* returns the network portion of the host address */ |
8cc4198f | 309 | extern in_addr_t ipv4_network_addr (in_addr_t hostaddr, int masklen); |
3fb9cd6e | 310 | /* given the address of a host on a network and the network mask length, |
311 | * calculate the broadcast address for that network; | |
312 | * special treatment for /31: returns the address of the other host | |
313 | * on the network by flipping the host bit */ | |
8cc4198f | 314 | extern in_addr_t ipv4_broadcast_addr (in_addr_t hostaddr, int masklen); |
3fb9cd6e | 315 | |
8cc4198f | 316 | extern int netmask_str2prefix_str (const char *, const char *, char *); |
718e3744 | 317 | |
8cc4198f | 318 | extern struct prefix_ipv6 *prefix_ipv6_new (void); |
319 | extern void prefix_ipv6_free (struct prefix_ipv6 *); | |
320 | extern int str2prefix_ipv6 (const char *, struct prefix_ipv6 *); | |
321 | extern void apply_mask_ipv6 (struct prefix_ipv6 *); | |
718e3744 | 322 | |
e4529636 AS |
323 | #define PREFIX_COPY_IPV6(DST, SRC) \ |
324 | *((struct prefix_ipv6 *)(DST)) = *((const struct prefix_ipv6 *)(SRC)); | |
325 | ||
8cc4198f | 326 | extern int ip6_masklen (struct in6_addr); |
21f569e3 | 327 | extern void masklen2ip6 (const int, struct in6_addr *); |
b04c699e | 328 | |
8cc4198f | 329 | extern const char *inet6_ntoa (struct in6_addr); |
5920990f | 330 | |
db42a173 PG |
331 | extern int prefix_str2mac(const char *str, struct ethaddr *mac); |
332 | extern char *prefix_mac2str(const struct ethaddr *mac, char *buf, int size); | |
c215ecaf | 333 | |
d914d5ff DS |
334 | static inline int ipv6_martian (struct in6_addr *addr) |
335 | { | |
336 | struct in6_addr localhost_addr; | |
337 | ||
338 | inet_pton (AF_INET6, "::1", &localhost_addr); | |
339 | ||
340 | if (IPV6_ADDR_SAME(&localhost_addr, addr)) | |
341 | return 1; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
8cc4198f | 346 | extern int all_digit (const char *); |
718e3744 | 347 | |
d914d5ff | 348 | /* NOTE: This routine expects the address argument in network byte order. */ |
6ee06fa9 PM |
349 | static inline int ipv4_martian (struct in_addr *addr) |
350 | { | |
d914d5ff | 351 | in_addr_t ip = ntohl(addr->s_addr); |
6ee06fa9 PM |
352 | |
353 | if (IPV4_NET0(ip) || IPV4_NET127(ip) || IPV4_CLASS_DE(ip)) { | |
354 | return 1; | |
355 | } | |
356 | return 0; | |
357 | } | |
358 | ||
18ff3edd DS |
359 | static inline int |
360 | is_default_prefix (struct prefix *p) | |
361 | { | |
362 | if (!p) | |
363 | return 0; | |
364 | ||
365 | if (((p->family == AF_INET) && (p->u.prefix4.s_addr == INADDR_ANY)) | |
366 | || ((p->family == AF_INET6) && | |
367 | !memcmp(&p->u.prefix6, &in6addr_any, sizeof (struct in6_addr)))) | |
368 | return 1; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
718e3744 | 373 | #endif /* _ZEBRA_PREFIX_H */ |