Initial revision
diff --git a/lib/prefix.h b/lib/prefix.h
new file mode 100644
index 0000000..7d7cde6
--- /dev/null
+++ b/lib/prefix.h
@@ -0,0 +1,161 @@
+/*
+ * 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
+
+/* 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)
+
+/* 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)
+
+/* Prototypes. */
+int afi2family (int);
+int family2afi (int);
+
+int prefix2str (struct prefix *, char *, int);
+int str2prefix (char *, struct prefix *);
+struct prefix *prefix_new ();
+void prefix_free (struct prefix *p);
+
+struct prefix_ipv4 *prefix_ipv4_new ();
+void prefix_ipv4_free ();
+int str2prefix_ipv4 (char *, struct prefix_ipv4 *);
+void apply_mask_ipv4 (struct prefix_ipv4 *);
+int prefix_blen (struct prefix *);
+u_char ip_masklen (struct in_addr);
+int prefix_ipv4_any (struct prefix_ipv4 *);
+void masklen2ip (int, struct in_addr *);
+void apply_classful_mask_ipv4 (struct prefix_ipv4 *);
+
+char *prefix_family_str (struct prefix *p);
+struct prefix *sockunion2prefix ();
+struct prefix *sockunion2hostprefix ();
+
+#ifdef HAVE_IPV6
+struct prefix_ipv6 *prefix_ipv6_new ();
+void prefix_ipv6_free ();
+struct prefix *str2routev6 (char *);
+int str2prefix_ipv6 (char *str, struct prefix_ipv6 *p);
+void apply_mask_ipv6 (struct prefix_ipv6 *p);
+void str2in6_addr (char *str, struct in6_addr *addr);
+void masklen2ip6 (int masklen, struct in6_addr *netmask);
+int ip6_masklen (struct in6_addr netmask);
+#endif /* HAVE_IPV6 */
+
+void apply_mask (struct prefix *);
+int prefix_match (struct prefix *n, struct prefix *p);
+int prefix_same (struct prefix *, struct prefix *);
+int prefix_cmp (struct prefix *, struct prefix *);
+void prefix_copy (struct prefix *, struct prefix *);
+
+int all_digit (char *);
+int netmask_str2prefix_str (char *, char *, char *);
+
+#endif /* _ZEBRA_PREFIX_H */