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https://github.com/RIOT-OS/RIOT.git
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3b7351753b
Add functions to generate an EUI based on the netdev ID. This will always return the same EUI for the same netdev, so it is stable across netdev resets.
130 lines
2.6 KiB
C
130 lines
2.6 KiB
C
/*
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* Copyright (C) 2017 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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* @ingroup sys_luid
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* @{
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*
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* @file
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* @brief LUID module implementation
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <stdint.h>
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#include <string.h>
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#include "assert.h"
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#include "periph/cpuid.h"
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#include "luid.h"
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#ifndef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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void __attribute__((weak)) luid_base(void *buf, size_t len)
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{
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memset(buf, LUID_BACKUP_SEED, len);
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#if CPUID_LEN
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uint8_t *out = (uint8_t *)buf;
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uint8_t cid[CPUID_LEN];
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cpuid_get(cid);
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for (size_t i = 0; i < MAX(len, CPUID_LEN); i++) {
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out[i % len] ^= cid[i % CPUID_LEN];
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}
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#endif
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}
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static uint8_t lastused;
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void luid_get(void *buf, size_t len)
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{
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luid_base(buf, len);
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((uint8_t *)buf)[0] ^= lastused++;
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}
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void luid_get_lb(void *buf, size_t len)
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{
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luid_base(buf, len);
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((uint8_t *)buf)[len - 1] ^= lastused++;
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}
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void luid_custom(void *buf, size_t len, int gen)
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{
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luid_base(buf, len);
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for (size_t i = 0; i < sizeof(gen); i++) {
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((uint8_t *)buf)[i % len] ^= ((gen >> (i * 8)) & 0xff);
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}
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}
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void luid_get_short(network_uint16_t *addr)
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{
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luid_base(addr, sizeof(*addr));
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addr->u8[1] ^= lastused++;
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/* https://tools.ietf.org/html/rfc4944#section-12 requires the first bit to
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* 0 for unicast addresses */
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addr->u8[0] &= 0x7F;
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}
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void luid_get_eui48(eui48_t *addr)
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{
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luid_base(addr, sizeof(*addr));
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addr->uint8[5] ^= lastused++;
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eui48_set_local(addr);
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eui48_clear_group(addr);
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}
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void luid_netdev_get_eui48(const netdev_t *netdev, eui48_t *addr)
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{
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luid_base(addr, sizeof(*addr));
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#ifdef MODULE_NETDEV_REGISTER
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addr->uint8[4] ^= netdev->type;
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addr->uint8[5] ^= netdev->index;
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#else
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/* we should only get here with gnrc_netif_single */
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(void)netdev;
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#endif
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eui48_set_local(addr);
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eui48_clear_group(addr);
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}
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void luid_get_eui64(eui64_t *addr)
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{
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luid_base(addr, sizeof(*addr));
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addr->uint8[7] ^= lastused++;
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eui64_set_local(addr);
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eui64_clear_group(addr);
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}
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void luid_netdev_get_eui64(const netdev_t *netdev, eui64_t *addr)
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{
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luid_base(addr, sizeof(*addr));
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#ifdef MODULE_NETDEV_REGISTER
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addr->uint8[6] ^= netdev->type;
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addr->uint8[7] ^= netdev->index;
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#else
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/* we should only get here with gnrc_netif_single */
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(void)netdev;
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#endif
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eui64_set_local(addr);
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eui64_clear_group(addr);
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}
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