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82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* Copyright (C) 2018 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup net_eui48 IEEE EUI-48 identifier
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* @ingroup net
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* @brief Definition and IPv6 IID conversion for IEEE EUI-48 identifiers
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* @{
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*
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* @file
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* @brief Definition and IPv6 IID conversion for IEEE EUI-48 identifiers
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef NET_EUI48_H
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#define NET_EUI48_H
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#include <stdint.h>
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#include "net/eui64.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Data type to represent an EUI-48
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*/
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typedef struct {
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uint8_t uint8[6]; /**< split into 6 8-bit words. */
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} eui48_t;
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/**
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* @brief Generates an IPv6 interface identifier from a 48-bit device address
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*
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* @see [RFC 2464, section 4](https://tools.ietf.org/html/rfc2464#section-4)
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* @see [RFC 4291, section 2.5.1](https://tools.ietf.org/html/rfc4291#section-2.5.1)
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*
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* @param[out] iid the resulting EUI-64.
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* @param[in] addr a 48-bit device address
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*/
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static inline void eui48_to_ipv6_iid(eui64_t *iid, const eui48_t *addr)
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{
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iid->uint8[0] = addr->uint8[0] ^ 0x02;
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iid->uint8[1] = addr->uint8[1];
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iid->uint8[2] = addr->uint8[2];
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iid->uint8[3] = 0xff;
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iid->uint8[4] = 0xfe;
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iid->uint8[5] = addr->uint8[3];
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iid->uint8[6] = addr->uint8[4];
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iid->uint8[7] = addr->uint8[5];
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}
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/**
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* @brief Convert a 64-bit IPv6 IID into a EUI-48 device address
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*
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* @param[out] addr the resulting EUI-48
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* @param[in] iid a 64-bit IPv6 interface identifier
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*/
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static inline void eui48_from_ipv6_iid(eui48_t *addr, const eui64_t *iid)
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{
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addr->uint8[0] = iid->uint8[0] ^ 0x02;
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addr->uint8[1] = iid->uint8[1];
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addr->uint8[2] = iid->uint8[2];
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addr->uint8[3] = iid->uint8[5];
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addr->uint8[4] = iid->uint8[6];
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addr->uint8[5] = iid->uint8[7];
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* NET_EUI48_H */
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/** @} */
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