eui48.h

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/*
 * Copyright (C) 2018 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include <stdint.h>
 
#include "net/eui64.h"
 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    uint8_t uint8[6];            
} eui48_t;


#define EUI48_LOCAL_FLAG    0x02

#define EUI48_GROUP_FLAG    0x01

static inline void eui48_set_local(eui48_t *addr)
{
    addr->uint8[0] |= EUI48_LOCAL_FLAG;
}

static inline void eui48_clear_group(eui48_t *addr)
{
    addr->uint8[0] &= ~EUI48_GROUP_FLAG;
}

static inline void eui48_to_eui64(eui64_t *eui64, const eui48_t *addr)
{
    eui64->uint8[0] = addr->uint8[0];
    eui64->uint8[1] = addr->uint8[1];
    eui64->uint8[2] = addr->uint8[2];
    eui64->uint8[3] = 0xff;
    eui64->uint8[4] = 0xfe;
    eui64->uint8[5] = addr->uint8[3];
    eui64->uint8[6] = addr->uint8[4];
    eui64->uint8[7] = addr->uint8[5];
}

static inline void eui64_to_eui48(eui48_t *eui48, const eui64_t *addr)
{
    /* Preserve vendor id */
    eui48->uint8[0] = addr->uint8[0];
    eui48->uint8[1] = addr->uint8[1];
    eui48->uint8[2] = addr->uint8[2];
 
    /* Use most volatile bits */
    eui48->uint8[3] = addr->uint8[5];
    eui48->uint8[4] = addr->uint8[6];
    eui48->uint8[5] = addr->uint8[7];
 
    /* EUI is only locally unique */
    eui48_set_local(eui48);
}

static inline void eui48_to_ipv6_iid(eui64_t *iid, const eui48_t *addr)
{
    eui48_to_eui64(iid, addr);
    iid->uint8[0] ^= 0x02;
}

static inline void eui48_from_ipv6_iid(eui48_t *addr, const eui64_t *iid)
{
    addr->uint8[0] = iid->uint8[0] ^ 0x02;
    addr->uint8[1] = iid->uint8[1];
    addr->uint8[2] = iid->uint8[2];
    addr->uint8[3] = iid->uint8[5];
    addr->uint8[4] = iid->uint8[6];
    addr->uint8[5] = iid->uint8[7];
}
 
#ifdef __cplusplus
}
#endif