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/** @file
*
* Declarations of routines to fetch IPv4 and IPv6 addresses from a tvbuff
* and then mask out bits other than those covered by a prefix length
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __ADDR_AND_MASK_H__
#define __ADDR_AND_MASK_H__
#include <wsutil/inet_ipv4.h>
#include <wsutil/inet_ipv6.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/*
* These routines return PREFIX_LEN_OK on success, PREFIX_LEN_TOO_LONG if
* the prefix length is too long, and PREFIX_LEN_ZERO if the prefix length
* is 0.
*/
#define PREFIX_LEN_OK 0
#define PREFIX_LEN_TOO_LONG 1
#define PREFIX_LEN_ZERO 2
/**
* Fetches an IPv4 address from a tvbuff and
* masks out bits other than those covered by a prefix length
*
* @param tvb tvbuff to read an IPv4 address from
* @param offset offset in the tvbuff to read the IPv4 address from
* @param addr memory location where the IPv4 address read should be stored
* @param prefix_len the length of the prefix (in bits)
* @return the length (in bytes) of the address on success, or -1 on failure
*/
extern int tvb_get_ipv4_addr_with_prefix_len(tvbuff_t *tvb, int offset,
ws_in4_addr *addr, guint32 prefix_len);
/**
* Fetches an IPv6 address from a tvbuff and
* masks out bits other than those covered by a prefix length
*
* @param tvb tvbuff to read an IPv6 address from
* @param offset offset in the tvbuff to read the IPv6 address from
* @param addr memory location where the IPv6 address read should be stored
* @param prefix_len the length of the prefix (in bits)
* @return the length (in bytes) of the address on success, or -1 on failure
*/
extern int tvb_get_ipv6_addr_with_prefix_len(tvbuff_t *tvb, int offset,
ws_in6_addr *addr, guint32 prefix_len);
/**
* Returns the IPv4 subnet mask of the specified length
*
* @param mask_length the number of bits in the subnet mask (max of 32)
* @return the subnet mask of the specified length
*/
guint32 ip_get_subnet_mask(const guint32 mask_length);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __ADDR_AND_MASK_H__ */
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