/* * Prefix structure. * Copyright (C) 1998 Kunihiro Ishiguro * * This file is part of GNU Zebra. * * GNU Zebra is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * GNU Zebra is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GNU Zebra; see the file COPYING. If not, write to the Free * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #ifndef _ZEBRA_PREFIX_H #define _ZEBRA_PREFIX_H #include "sockunion.h" /* * A struct prefix contains an address family, a prefix length, and an * address. This can represent either a 'network prefix' as defined * by CIDR, where the 'host bits' of the prefix are 0 * (e.g. AF_INET:10.0.0.0/8), or an address and netmask * (e.g. AF_INET:10.0.0.9/8), such as might be configured on an * interface. */ /* IPv4 and IPv6 unified prefix structure. */ struct prefix { u_char family; u_char prefixlen; union { u_char prefix; struct in_addr prefix4; #ifdef HAVE_IPV6 struct in6_addr prefix6; #endif /* HAVE_IPV6 */ struct { struct in_addr id; struct in_addr adv_router; } lp; u_char val[8]; } u __attribute__ ((aligned (8))); }; /* IPv4 prefix structure. */ struct prefix_ipv4 { u_char family; u_char prefixlen; struct in_addr prefix __attribute__ ((aligned (8))); }; /* IPv6 prefix structure. */ #ifdef HAVE_IPV6 struct prefix_ipv6 { u_char family; u_char prefixlen; struct in6_addr prefix __attribute__ ((aligned (8))); }; #endif /* HAVE_IPV6 */ struct prefix_ls { u_char family; u_char prefixlen; struct in_addr id __attribute__ ((aligned (8))); struct in_addr adv_router; }; /* Prefix for routing distinguisher. */ struct prefix_rd { u_char family; u_char prefixlen; u_char val[8] __attribute__ ((aligned (8))); }; #ifndef INET_ADDRSTRLEN #define INET_ADDRSTRLEN 16 #endif /* INET_ADDRSTRLEN */ #ifndef INET6_ADDRSTRLEN #define INET6_ADDRSTRLEN 46 #endif /* INET6_ADDRSTRLEN */ #ifndef INET6_BUFSIZ #define INET6_BUFSIZ 51 #endif /* INET6_BUFSIZ */ /* Max bit/byte length of IPv4 address. */ #define IPV4_MAX_BYTELEN 4 #define IPV4_MAX_BITLEN 32 #define IPV4_MAX_PREFIXLEN 32 #define IPV4_ADDR_CMP(D,S) memcmp ((D), (S), IPV4_MAX_BYTELEN) #define IPV4_ADDR_SAME(D,S) (memcmp ((D), (S), IPV4_MAX_BYTELEN) == 0) #define IPV4_ADDR_COPY(D,S) memcpy ((D), (S), IPV4_MAX_BYTELEN) #define IPV4_NET0(a) ((((u_int32_t) (a)) & 0xff000000) == 0x00000000) #define IPV4_NET127(a) ((((u_int32_t) (a)) & 0xff000000) == 0x7f000000) #define IPV4_LINKLOCAL(a) ((((u_int32_t) (a)) & 0xffff0000) == 0xa9fe0000) /* Max bit/byte length of IPv6 address. */ #define IPV6_MAX_BYTELEN 16 #define IPV6_MAX_BITLEN 128 #define IPV6_MAX_PREFIXLEN 128 #define IPV6_ADDR_CMP(D,S) memcmp ((D), (S), IPV6_MAX_BYTELEN) #define IPV6_ADDR_SAME(D,S) (memcmp ((D), (S), IPV6_MAX_BYTELEN) == 0) #define IPV6_ADDR_COPY(D,S) memcpy ((D), (S), IPV6_MAX_BYTELEN) /* Count prefix size from mask length */ #define PSIZE(a) (((a) + 7) / (8)) /* Prefix's family member. */ #define PREFIX_FAMILY(p) ((p)->family) /* Check bit of the prefix. */ static inline unsigned int prefix_bit (const u_char *prefix, const u_char prefixlen) { unsigned int offset = prefixlen / 8; unsigned int shift = 7 - (prefixlen % 8); return (prefix[offset] >> shift) & 1; } static inline unsigned int prefix6_bit (const struct in6_addr *prefix, const u_char prefixlen) { return prefix_bit((const u_char *) &prefix->s6_addr, prefixlen); } /* Prototypes. */ extern int afi2family (int); extern int family2afi (int); extern struct prefix *prefix_new (void); extern void prefix_free (struct prefix *); extern const char *prefix_family_str (const struct prefix *); extern int prefix_blen (const struct prefix *); extern int str2prefix (const char *, struct prefix *); extern int prefix2str (const struct prefix *, char *, int); extern int prefix_match (const struct prefix *, const struct prefix *); extern int prefix_same (const struct prefix *, const struct prefix *); extern int prefix_cmp (const struct prefix *, const struct prefix *); extern void prefix_copy (struct prefix *dest, const struct prefix *src); extern void apply_mask (struct prefix *); extern struct prefix *sockunion2prefix (const union sockunion *dest, const union sockunion *mask); extern struct prefix *sockunion2hostprefix (const union sockunion *); extern struct prefix_ipv4 *prefix_ipv4_new (void); extern void prefix_ipv4_free (struct prefix_ipv4 *); extern int str2prefix_ipv4 (const char *, struct prefix_ipv4 *); extern void apply_mask_ipv4 (struct prefix_ipv4 *); #define PREFIX_COPY_IPV4(DST, SRC) \ *((struct prefix_ipv4 *)(DST)) = *((const struct prefix_ipv4 *)(SRC)); extern int prefix_ipv4_any (const struct prefix_ipv4 *); extern void apply_classful_mask_ipv4 (struct prefix_ipv4 *); extern u_char ip_masklen (struct in_addr); extern void masklen2ip (int, struct in_addr *); /* returns the network portion of the host address */ extern in_addr_t ipv4_network_addr (in_addr_t hostaddr, int masklen); /* given the address of a host on a network and the network mask length, * calculate the broadcast address for that network; * special treatment for /31: returns the address of the other host * on the network by flipping the host bit */ extern in_addr_t ipv4_broadcast_addr (in_addr_t hostaddr, int masklen); extern int netmask_str2prefix_str (const char *, const char *, char *); #ifdef HAVE_IPV6 extern struct prefix_ipv6 *prefix_ipv6_new (void); extern void prefix_ipv6_free (struct prefix_ipv6 *); extern int str2prefix_ipv6 (const char *, struct prefix_ipv6 *); extern void apply_mask_ipv6 (struct prefix_ipv6 *); #define PREFIX_COPY_IPV6(DST, SRC) \ *((struct prefix_ipv6 *)(DST)) = *((const struct prefix_ipv6 *)(SRC)); extern int ip6_masklen (struct in6_addr); extern void masklen2ip6 (int, struct in6_addr *); extern void str2in6_addr (const char *, struct in6_addr *); extern const char *inet6_ntoa (struct in6_addr); #endif /* HAVE_IPV6 */ extern int all_digit (const char *); #endif /* _ZEBRA_PREFIX_H */