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70 lines
1.7 KiB
C
70 lines
1.7 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
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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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* @defgroup net_rpl_srh RPL source routing header extension
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* @ingroup net_ng_rpl
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* @brief Implementation of RPL source routing extension headers
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* @see <a href="https://tools.ietf.org/html/rfc6554">
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* RFC 6554
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* </a>
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* @{
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*
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* @file
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* @brief Definititions for RPL source routing extension headers
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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 NG_RPL_SRH_H_
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#define NG_RPL_SRH_H_
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#include "net/ng_ipv6/addr.h"
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#include "net/ng_ipv6/ext.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Type for source routing header.
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*/
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#define NG_RPL_SRH_TYPE (3U)
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/**
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* @brief The RPL Source routing header.
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*
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* @see <a href="https://tools.ietf.org/html/rfc6554">
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* RFC 6554
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* </a>
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*
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* @extends ng_ipv6_ext_rh_t
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*/
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typedef struct __attribute__((packed)) {
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uint8_t nh; /**< next header */
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uint8_t len; /**< length in 8 octets without first octet */
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uint8_t type; /**< identifier of a particular routing header type */
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uint8_t seg_left; /**< number of route segments remaining */
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} ng_rpl_srh_t;
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/**
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* @brief Extract next hop from the RPL source routing header.
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*
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* @param[in] rh A RPL source routing header.
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*
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* @return next hop, on success
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* @return NULL, if not found.
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*/
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ng_ipv6_addr_t *ng_rpl_srh_next_hop(ng_rpl_srh_t *rh);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NG_RPL_SRH_H_ */
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/** @} */
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