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81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for
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* more details.
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*/
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/**
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* @defgroup net_ethernet Ethernet
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* @ingroup net
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* @brief Provides Ethernet header and helper functions
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* @{
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*
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* @file
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* @brief Definitions for Ethernet
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*
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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*/
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#ifndef ETHERNET_H_
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#define ETHERNET_H_
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#include <stdint.h>
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#include "net/ethernet/hdr.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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#define ETHERNET_DATA_LEN (1500) /**< maximum number of bytes in payload */
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#define ETHERNET_FCS_LEN (4) /**< number of bytes in the FCS
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* (frame check sequence) */
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/**
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* @brief maximum number of bytes in an ethernet frame (without FCS)
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*/
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#define ETHERNET_FRAME_LEN (ETHERNET_DATA_LEN + sizeof(ethernet_hdr_t))
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#define ETHERNET_MIN_LEN (64) /**< minimum number of bytes in an
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* ethernet frame (with FCF) */
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/**
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* @brief maximum number of bytes in an ethernet frame (with FCF)
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*/
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#define ETHERNET_MAX_LEN (ETHERNET_FRAME_LEN + ETHERNET_FCS_LEN)
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/**
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* @brief Generates an IPv6 interface identifier from a 48-bit MAC address.
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*
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* @see <a href="https://tools.ietf.org/html/rfc2464#section-4">
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* RFC 2464, section 4
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* </a>
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*
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* @param[out] eui64 The resulting EUI-64.
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* @param[in] mac A 48-bit MAC address. Is expected to be at least
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* @ref ETHERNET_ADDR_LEN long.
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*/
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static inline void ethernet_get_iid(eui64_t *eui64, uint8_t *mac)
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{
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eui64->uint8[0] = mac[0] ^ 0x02;
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eui64->uint8[1] = mac[1];
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eui64->uint8[2] = mac[2];
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eui64->uint8[3] = 0xff;
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eui64->uint8[4] = 0xfe;
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eui64->uint8[5] = mac[3];
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eui64->uint8[6] = mac[4];
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eui64->uint8[7] = mac[5];
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* ETHERNET_H_ */
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/**
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* @}
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*/
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