nes-proj/os/net/linkaddr.h

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