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