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/*
* Copyright 2013 Google Inc.
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/*
* Author: ncardwell@google.com (Neal Cardwell)
*
* Types and operations for IPv4 and IPv6 address prefixes.
*/
#ifndef __IP_PREFIX_H__
#define __IP_PREFIX_H__
#include "types.h"
#include "ip_address.h"
/* IPv4 or IPv6 address prefix. */
struct ip_prefix {
struct ip_address ip;
int prefix_len; /* prefix length in bits */
};
static inline void ip_prefix_reset(struct ip_prefix *prefix)
{
memset(prefix, 0, sizeof(*prefix));
}
/* Parse a human-readable IPv4 prefix and return it. Print an error
* to stderr and exit if there is an error parsing the prefix.
*/
extern struct ip_prefix ipv4_prefix_parse(const char *prefix_string);
/* Parse a human-readable IPv6 prefix and return it. Print an error
* to stderr and exit if there is an error parsing the prefix.
*/
extern struct ip_prefix ipv6_prefix_parse(const char *prefix_string);
/* Fill in the given prefix using the first 'prefix_len' bits of the
* given IP address, zeroing out bits beyond the prefix length.
*/
extern struct ip_prefix ip_to_prefix(const struct ip_address *ip,
int prefix_len);
/* Zero the bits beyond the prefix length. */
void ip_prefix_normalize(struct ip_prefix *prefix);
/* Print a human-readable representation of the given IP prefix in the
* given buffer, which must be at least ADDR_STR_LEN bytes long.
* Returns a pointer to the given buffer.
*/
extern const char *ip_prefix_to_string(struct ip_prefix *prefix,
char *buffer);
#endif /* __IP_PREFIX_H__ */
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