140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Header file for the link-layer address representation
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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/**
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* \addtogroup netstack
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* @{
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*/
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/**
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* \defgroup linkaddr link-layer addresses
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* @{
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*
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* The linkaddr module handles link-layer addresses.
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*
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*/
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#ifndef LINKADDR_H_
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#define LINKADDR_H_
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#include "contiki-conf.h"
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#ifdef LINKADDR_CONF_SIZE
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#define LINKADDR_SIZE LINKADDR_CONF_SIZE
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#else /* LINKADDR_SIZE */
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#define LINKADDR_SIZE 8
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#endif /* LINKADDR_SIZE */
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typedef union {
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unsigned char u8[LINKADDR_SIZE];
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#if LINKADDR_SIZE == 2
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uint16_t u16;
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#else
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uint16_t u16[LINKADDR_SIZE/2];
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#endif /* LINKADDR_SIZE == 2 */
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} linkaddr_t;
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typedef union {
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uint8_t u8[8];
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uint16_t u16[4];
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} linkaddr_extended_t;
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/**
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* \brief Copy a link-layer address
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* \param dest The destination
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* \param from The source
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*
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* This function copies a link-layer address from one location
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* to another.
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*
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*/
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void linkaddr_copy(linkaddr_t *dest, const linkaddr_t *from);
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/**
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* \brief Compare two link-layer addresses
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* \param addr1 The first address
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* \param addr2 The second address
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* \return Non-zero if the addresses are the same, zero if they are different
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*
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* This function compares two link-layer addresses and returns
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* the result of the comparison. The function acts like
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* the '==' operator and returns non-zero if the addresses
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* are the same, and zero if the addresses are different.
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*
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*/
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int linkaddr_cmp(const linkaddr_t *addr1, const linkaddr_t *addr2);
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/**
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* \brief Set the address of the current node
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* \param addr The address
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*
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* This function sets the link-layer address of the node.
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*
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*/
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void linkaddr_set_node_addr(linkaddr_t *addr);
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/**
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* \brief The link-layer address of the node
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*
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* This variable contains the link-layer address of the
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* node. This variable should not be changed directly;
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* rather, the linkaddr_set_node_addr() function should be
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* used.
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*
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*/
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extern linkaddr_t linkaddr_node_addr;
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/**
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* \brief The null link-layer address
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*
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* This variable contains the null link-layer address. The null
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* address is used in route tables to indicate that the
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* table entry is unused. Nodes with no configured address
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* has the null address. Nodes with their node address set
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* to the null address will have problems communicating
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* with other nodes.
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*
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*/
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extern const linkaddr_t linkaddr_null;
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#endif /* LINKADDR_H_ */
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/** @} */
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/** @} */
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