Annotation of embedaddon/quagga/lib/prefix.h, revision 1.1.1.3
1.1 misho 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:
26: #include "sockunion.h"
27:
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:
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];
1.1.1.3 ! misho 55: uintptr_t ptr;
1.1 misho 56: } u __attribute__ ((aligned (8)));
57: };
58:
59: /* IPv4 prefix structure. */
60: struct prefix_ipv4
61: {
62: u_char family;
63: u_char prefixlen;
64: struct in_addr prefix __attribute__ ((aligned (8)));
65: };
66:
67: /* IPv6 prefix structure. */
68: #ifdef HAVE_IPV6
69: struct prefix_ipv6
70: {
71: u_char family;
72: u_char prefixlen;
73: struct in6_addr prefix __attribute__ ((aligned (8)));
74: };
75: #endif /* HAVE_IPV6 */
76:
77: struct prefix_ls
78: {
79: u_char family;
80: u_char prefixlen;
81: struct in_addr id __attribute__ ((aligned (8)));
82: struct in_addr adv_router;
83: };
84:
85: /* Prefix for routing distinguisher. */
86: struct prefix_rd
87: {
88: u_char family;
89: u_char prefixlen;
90: u_char val[8] __attribute__ ((aligned (8)));
91: };
92:
1.1.1.3 ! misho 93: /* Prefix for a generic pointer */
! 94: struct prefix_ptr
! 95: {
! 96: u_char family;
! 97: u_char prefixlen;
! 98: uintptr_t prefix __attribute__ ((aligned (8)));
! 99: };
! 100:
! 101: /* helper to get type safety/avoid casts on calls
! 102: * (w/o this, functions accepting all prefix types need casts on the caller
! 103: * side, which strips type safety since the cast will accept any pointer
! 104: * type.)
! 105: */
! 106: union prefix46ptr
! 107: {
! 108: struct prefix *p;
! 109: struct prefix_ipv4 *p4;
! 110: struct prefix_ipv6 *p6;
! 111: } __attribute__ ((transparent_union));
! 112:
! 113: union prefix46constptr
! 114: {
! 115: const struct prefix *p;
! 116: const struct prefix_ipv4 *p4;
! 117: const struct prefix_ipv6 *p6;
! 118: } __attribute__ ((transparent_union));
! 119:
1.1 misho 120: #ifndef INET_ADDRSTRLEN
121: #define INET_ADDRSTRLEN 16
122: #endif /* INET_ADDRSTRLEN */
123:
124: #ifndef INET6_ADDRSTRLEN
125: #define INET6_ADDRSTRLEN 46
126: #endif /* INET6_ADDRSTRLEN */
127:
128: #ifndef INET6_BUFSIZ
129: #define INET6_BUFSIZ 51
130: #endif /* INET6_BUFSIZ */
131:
1.1.1.3 ! misho 132: /* Maximum prefix string length (IPv6) */
! 133: #define PREFIX_STRLEN 51
! 134:
1.1 misho 135: /* Max bit/byte length of IPv4 address. */
136: #define IPV4_MAX_BYTELEN 4
137: #define IPV4_MAX_BITLEN 32
138: #define IPV4_MAX_PREFIXLEN 32
139: #define IPV4_ADDR_CMP(D,S) memcmp ((D), (S), IPV4_MAX_BYTELEN)
140: #define IPV4_ADDR_SAME(D,S) (memcmp ((D), (S), IPV4_MAX_BYTELEN) == 0)
141: #define IPV4_ADDR_COPY(D,S) memcpy ((D), (S), IPV4_MAX_BYTELEN)
142:
143: #define IPV4_NET0(a) ((((u_int32_t) (a)) & 0xff000000) == 0x00000000)
144: #define IPV4_NET127(a) ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000)
145: #define IPV4_LINKLOCAL(a) ((((u_int32_t) (a)) & 0xffff0000) == 0xa9fe0000)
1.1.1.2 misho 146: #define IPV4_CLASS_DE(a) ((((u_int32_t) (a)) & 0xe0000000) == 0xe0000000)
1.1 misho 147:
148: /* Max bit/byte length of IPv6 address. */
149: #define IPV6_MAX_BYTELEN 16
150: #define IPV6_MAX_BITLEN 128
151: #define IPV6_MAX_PREFIXLEN 128
152: #define IPV6_ADDR_CMP(D,S) memcmp ((D), (S), IPV6_MAX_BYTELEN)
153: #define IPV6_ADDR_SAME(D,S) (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0)
154: #define IPV6_ADDR_COPY(D,S) memcpy ((D), (S), IPV6_MAX_BYTELEN)
155:
156: /* Count prefix size from mask length */
157: #define PSIZE(a) (((a) + 7) / (8))
158:
159: /* Prefix's family member. */
160: #define PREFIX_FAMILY(p) ((p)->family)
161:
1.1.1.3 ! misho 162: /* glibc defines s6_addr32 to __in6_u.__u6_addr32 if __USE_{MISC || GNU} */
! 163: #ifndef s6_addr32
! 164: #if defined(SUNOS_5)
! 165: /* Some SunOS define s6_addr32 only to kernel */
! 166: #define s6_addr32 _S6_un._S6_u32
! 167: #else
! 168: #define s6_addr32 __u6_addr.__u6_addr32
! 169: #endif /* SUNOS_5 */
! 170: #endif /*s6_addr32*/
! 171:
1.1 misho 172: /* Prototypes. */
1.1.1.3 ! misho 173: extern int str2family(const char *);
1.1 misho 174: extern int afi2family (afi_t);
175: extern afi_t family2afi (int);
1.1.1.3 ! misho 176: extern const char *safi2str(safi_t safi);
1.1 misho 177:
1.1.1.2 misho 178: /* Check bit of the prefix. */
179: extern unsigned int prefix_bit (const u_char *prefix, const u_char prefixlen);
180: extern unsigned int prefix6_bit (const struct in6_addr *prefix, const u_char prefixlen);
181:
1.1 misho 182: extern struct prefix *prefix_new (void);
183: extern void prefix_free (struct prefix *);
184: extern const char *prefix_family_str (const struct prefix *);
185: extern int prefix_blen (const struct prefix *);
186: extern int str2prefix (const char *, struct prefix *);
1.1.1.3 ! misho 187: extern const char *prefix2str (union prefix46constptr, char *, int);
1.1 misho 188: extern int prefix_match (const struct prefix *, const struct prefix *);
189: extern int prefix_same (const struct prefix *, const struct prefix *);
190: extern int prefix_cmp (const struct prefix *, const struct prefix *);
1.1.1.2 misho 191: extern int prefix_common_bits (const struct prefix *, const struct prefix *);
1.1 misho 192: extern void prefix_copy (struct prefix *dest, const struct prefix *src);
193: extern void apply_mask (struct prefix *);
194:
195: extern struct prefix *sockunion2prefix (const union sockunion *dest,
196: const union sockunion *mask);
1.1.1.3 ! misho 197: extern struct prefix *sockunion2hostprefix (const union sockunion *, struct prefix *p);
1.1.1.2 misho 198: extern void prefix2sockunion (const struct prefix *, union sockunion *);
1.1 misho 199:
200: extern struct prefix_ipv4 *prefix_ipv4_new (void);
201: extern void prefix_ipv4_free (struct prefix_ipv4 *);
202: extern int str2prefix_ipv4 (const char *, struct prefix_ipv4 *);
203: extern void apply_mask_ipv4 (struct prefix_ipv4 *);
204:
205: #define PREFIX_COPY_IPV4(DST, SRC) \
206: *((struct prefix_ipv4 *)(DST)) = *((const struct prefix_ipv4 *)(SRC));
207:
208: extern int prefix_ipv4_any (const struct prefix_ipv4 *);
209: extern void apply_classful_mask_ipv4 (struct prefix_ipv4 *);
210:
211: extern u_char ip_masklen (struct in_addr);
1.1.1.2 misho 212: extern void masklen2ip (const int, struct in_addr *);
1.1 misho 213: /* returns the network portion of the host address */
214: extern in_addr_t ipv4_network_addr (in_addr_t hostaddr, int masklen);
215: /* given the address of a host on a network and the network mask length,
216: * calculate the broadcast address for that network;
217: * special treatment for /31: returns the address of the other host
218: * on the network by flipping the host bit */
219: extern in_addr_t ipv4_broadcast_addr (in_addr_t hostaddr, int masklen);
220:
221: extern int netmask_str2prefix_str (const char *, const char *, char *);
222:
223: #ifdef HAVE_IPV6
224: extern struct prefix_ipv6 *prefix_ipv6_new (void);
225: extern void prefix_ipv6_free (struct prefix_ipv6 *);
226: extern int str2prefix_ipv6 (const char *, struct prefix_ipv6 *);
227: extern void apply_mask_ipv6 (struct prefix_ipv6 *);
228:
229: #define PREFIX_COPY_IPV6(DST, SRC) \
230: *((struct prefix_ipv6 *)(DST)) = *((const struct prefix_ipv6 *)(SRC));
231:
232: extern int ip6_masklen (struct in6_addr);
1.1.1.2 misho 233: extern void masklen2ip6 (const int, struct in6_addr *);
1.1 misho 234:
235: extern void str2in6_addr (const char *, struct in6_addr *);
236: extern const char *inet6_ntoa (struct in6_addr);
237:
238: #endif /* HAVE_IPV6 */
239:
240: extern int all_digit (const char *);
1.1.1.3 ! misho 241:
! 242: static inline int ipv4_martian (struct in_addr *addr)
! 243: {
! 244: in_addr_t ip = addr->s_addr;
! 245:
! 246: if (IPV4_NET0(ip) || IPV4_NET127(ip) || IPV4_CLASS_DE(ip)) {
! 247: return 1;
! 248: }
! 249: return 0;
! 250: }
1.1 misho 251:
252: #endif /* _ZEBRA_PREFIX_H */
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