lib/prefix.h

   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 /* IPv4 and IPv6 unified prefix structure. */
  27 struct prefix
  28 {
  29   u_char family;
  30   u_char prefixlen;
  31   union
  32   {
  33     u_char prefix;
  34     struct in_addr prefix4;
  35 #ifdef HAVE_IPV6
  36     struct in6_addr prefix6;
  37 #endif /* HAVE_IPV6 */
  38     struct
  39     {
  40       struct in_addr id;
  41       struct in_addr adv_router;
  42     } lp;
  43     u_char val[8];
  44   } u __attribute__ ((aligned (8)));
  45 };
  46
  47 /* IPv4 prefix structure. */
  48 struct prefix_ipv4
  49 {
  50   u_char family;
  51   u_char prefixlen;
  52   struct in_addr prefix __attribute__ ((aligned (8)));
  53 };
  54
  55 /* IPv6 prefix structure. */
  56 #ifdef HAVE_IPV6
  57 struct prefix_ipv6
  58 {
  59   u_char family;
  60   u_char prefixlen;
  61   struct in6_addr prefix __attribute__ ((aligned (8)));
  62 };
  63 #endif /* HAVE_IPV6 */
  64
  65 struct prefix_ls
  66 {
  67   u_char family;
  68   u_char prefixlen;
  69   struct in_addr id __attribute__ ((aligned (8)));
  70   struct in_addr adv_router;
  71 };
  72
  73 /* Prefix for routing distinguisher. */
  74 struct prefix_rd
  75 {
  76   u_char family;
  77   u_char prefixlen;
  78   u_char val[8] __attribute__ ((aligned (8)));
  79 };
  80
  81 #ifndef INET_ADDRSTRLEN
  82 #define INET_ADDRSTRLEN 16
  83 #endif /* INET_ADDRSTRLEN */
  84
  85 #ifndef INET6_ADDRSTRLEN
  86 #define INET6_ADDRSTRLEN 46
  87 #endif /* INET6_ADDRSTRLEN */
  88
  89 #ifndef INET6_BUFSIZ
  90 #define INET6_BUFSIZ 51
  91 #endif /* INET6_BUFSIZ */
  92
  93 /* Max bit/byte length of IPv4 address. */
  94 #define IPV4_MAX_BYTELEN    4
  95 #define IPV4_MAX_BITLEN    32
  96 #define IPV4_MAX_PREFIXLEN 32
  97 #define IPV4_ADDR_CMP(D,S)   memcmp ((D), (S), IPV4_MAX_BYTELEN)
  98 #define IPV4_ADDR_SAME(D,S)  (memcmp ((D), (S), IPV4_MAX_BYTELEN) == 0)
  99 #define IPV4_ADDR_COPY(D,S)  memcpy ((D), (S), IPV4_MAX_BYTELEN)
 100
 101 #define IPV4_NET0(a)    ((((u_int32_t) (a)) & 0xff000000) == 0x00000000)
 102 #define IPV4_NET127(a)  ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000)
 103
 104 /* Max bit/byte length of IPv6 address. */
 105 #define IPV6_MAX_BYTELEN    16
 106 #define IPV6_MAX_BITLEN    128
 107 #define IPV6_MAX_PREFIXLEN 128
 108 #define IPV6_ADDR_CMP(D,S)   memcmp ((D), (S), IPV6_MAX_BYTELEN)
 109 #define IPV6_ADDR_SAME(D,S)  (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0)
 110 #define IPV6_ADDR_COPY(D,S)  memcpy ((D), (S), IPV6_MAX_BYTELEN)
 111
 112 /* Count prefix size from mask length */
 113 #define PSIZE(a) (((a) + 7) / (8))
 114
 115 /* Prefix's family member. */
 116 #define PREFIX_FAMILY(p)  ((p)->family)
 117
 118 /* Prototypes. */
 119 int afi2family (int);
 120 int family2afi (int);
 121
 122 int prefix2str (struct prefix *, char *, int);
 123 int str2prefix (char *, struct prefix *);
 124 struct prefix *prefix_new ();
 125 void prefix_free (struct prefix *p);
 126
 127 struct prefix_ipv4 *prefix_ipv4_new ();
 128 void prefix_ipv4_free ();
 129 int str2prefix_ipv4 (char *, struct prefix_ipv4 *);
 130 void apply_mask_ipv4 (struct prefix_ipv4 *);
 131 int prefix_blen (struct prefix *);
 132 u_char ip_masklen (struct in_addr);
 133 int prefix_ipv4_any (struct prefix_ipv4 *);
 134 void masklen2ip (int, struct in_addr *);
 135 void apply_classful_mask_ipv4 (struct prefix_ipv4 *);
 136
 137 char *prefix_family_str (struct prefix *p);
 138 struct prefix *sockunion2prefix ();
 139 struct prefix *sockunion2hostprefix ();
 140
 141 #ifdef HAVE_IPV6
 142 struct prefix_ipv6 *prefix_ipv6_new ();
 143 void prefix_ipv6_free ();
 144 struct prefix *str2routev6 (char *);
 145 int str2prefix_ipv6 (char *str, struct prefix_ipv6 *p);
 146 void apply_mask_ipv6 (struct prefix_ipv6 *p);
 147 void str2in6_addr (char *str, struct in6_addr *addr);
 148 void masklen2ip6 (int masklen, struct in6_addr *netmask);
 149 int ip6_masklen (struct in6_addr netmask);
 150 #endif /* HAVE_IPV6 */
 151
 152 void apply_mask (struct prefix *);
 153 int prefix_match (struct prefix *n, struct prefix *p);
 154 int prefix_same (struct prefix *, struct prefix *);
 155 int prefix_cmp (struct prefix *, struct prefix *);
 156 void prefix_copy (struct prefix *, struct prefix *);
 157
 158 int all_digit (char *);
 159 int netmask_str2prefix_str (char *, char *, char *);
 160
 161 #endif /* _ZEBRA_PREFIX_H */