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