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eui48.h
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1/*
2 * Copyright (C) 2018 Freie Universität Berlin
3 *
4 * This file is subject to the terms and conditions of the GNU Lesser
5 * General Public License v2.1. See the file LICENSE in the top level
6 * directory for more details.
7 */
8
21#ifndef NET_EUI48_H
22#define NET_EUI48_H
23
24#include <stdint.h>
25
26#include "net/eui64.h"
27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
35typedef struct {
36 uint8_t uint8[6];
37} eui48_t;
38
49#define EUI48_LOCAL_FLAG 0x02
50
54#define EUI48_GROUP_FLAG 0x01
64static inline void eui48_set_local(eui48_t *addr)
65{
66 addr->uint8[0] |= EUI48_LOCAL_FLAG;
67}
68
77static inline void eui48_clear_group(eui48_t *addr)
78{
79 addr->uint8[0] &= ~EUI48_GROUP_FLAG;
80}
81
90static inline void eui48_to_eui64(eui64_t *eui64, const eui48_t *addr)
91{
92 eui64->uint8[0] = addr->uint8[0];
93 eui64->uint8[1] = addr->uint8[1];
94 eui64->uint8[2] = addr->uint8[2];
95 eui64->uint8[3] = 0xff;
96 eui64->uint8[4] = 0xfe;
97 eui64->uint8[5] = addr->uint8[3];
98 eui64->uint8[6] = addr->uint8[4];
99 eui64->uint8[7] = addr->uint8[5];
100}
101
111static inline void eui64_to_eui48(eui48_t *eui48, const eui64_t *addr)
112{
113 /* Preserve vendor id */
114 eui48->uint8[0] = addr->uint8[0];
115 eui48->uint8[1] = addr->uint8[1];
116 eui48->uint8[2] = addr->uint8[2];
117
118 /* Use most volatile bits */
119 eui48->uint8[3] = addr->uint8[5];
120 eui48->uint8[4] = addr->uint8[6];
121 eui48->uint8[5] = addr->uint8[7];
122
123 /* EUI is only locally unique */
124 eui48_set_local(eui48);
125}
126
137static inline void eui48_to_ipv6_iid(eui64_t *iid, const eui48_t *addr)
138{
139 eui48_to_eui64(iid, addr);
140 iid->uint8[0] ^= 0x02;
141}
142
149static inline void eui48_from_ipv6_iid(eui48_t *addr, const eui64_t *iid)
150{
151 addr->uint8[0] = iid->uint8[0] ^ 0x02;
152 addr->uint8[1] = iid->uint8[1];
153 addr->uint8[2] = iid->uint8[2];
154 addr->uint8[3] = iid->uint8[5];
155 addr->uint8[4] = iid->uint8[6];
156 addr->uint8[5] = iid->uint8[7];
157}
158
159#ifdef __cplusplus
160}
161#endif
162
163#endif /* NET_EUI48_H */
EUI-64 data type definition.
static void eui64_to_eui48(eui48_t *eui48, const eui64_t *addr)
Generates an EUI-48 from a 64-bit device address.
Definition eui48.h:111
static void eui48_to_ipv6_iid(eui64_t *iid, const eui48_t *addr)
Generates an IPv6 interface identifier from a 48-bit device address.
Definition eui48.h:137
static void eui48_set_local(eui48_t *addr)
Set the locally administrated bit in the EUI-48 address.
Definition eui48.h:64
static void eui48_from_ipv6_iid(eui48_t *addr, const eui64_t *iid)
Convert a 64-bit IPv6 IID into a EUI-48 device address.
Definition eui48.h:149
static void eui48_clear_group(eui48_t *addr)
Clear the group address bit to signal the address as individual address.
Definition eui48.h:77
#define EUI48_LOCAL_FLAG
Locally administered address.
Definition eui48.h:49
static void eui48_to_eui64(eui64_t *eui64, const eui48_t *addr)
Generates an EUI-64 from a 48-bit device address.
Definition eui48.h:90
Data type to represent an EUI-48.
Definition eui48.h:35
uint8_t uint8[6]
split into 6 8-bit words.
Definition eui48.h:36
Data type to represent an EUI-64.
Definition eui64.h:55
uint8_t uint8[8]
split into 8 8-bit words.
Definition eui64.h:57