srh.h
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/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup net_gnrc_rpl_srh RPL source routing header extension
* @ingroup net_gnrc_rpl
* @brief Implementation of RPL source routing extension headers
* @see <a href="https://tools.ietf.org/html/rfc6554">
* RFC 6554
* </a>
* @{
*
* @file
* @brief Definititions for RPL source routing extension headers
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef GNRC_RPL_SRH_H_
#define GNRC_RPL_SRH_H_
#include "net/ipv6/hdr.h"
#include "net/ipv6/addr.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Type for source routing header.
*/
#define GNRC_RPL_SRH_TYPE (3U)
/**
* @brief The RPL Source routing header.
*
* @see <a href="https://tools.ietf.org/html/rfc6554">
* RFC 6554
* </a>
*
* @extends ipv6_ext_rh_t
*/
typedef struct __attribute__((packed)) {
uint8_t nh; /**< next header */
uint8_t len; /**< length in 8 octets without first octet */
uint8_t type; /**< identifier of a particular routing header type */
uint8_t seg_left; /**< number of route segments remaining */
uint8_t compr; /**< number of prefix octets (comprI and comprE) */
uint8_t pad_resv; /**< padding and reserved */
uint16_t resv; /**< reserved */
} gnrc_rpl_srh_t;
/**
* @brief Process the RPL source routing header.
*
* @param[in,out] ipv6 The IPv6 header of the incoming packet.
* @param[in] rh A RPL source routing header.
*
* @return EXT_RH_CODE_ERROR
* @return EXT_RH_CODE_FORWARD
* @return EXT_RH_CODE_OK
*/
int gnrc_rpl_srh_process(ipv6_hdr_t *ipv6, gnrc_rpl_srh_t *rh);
#ifdef __cplusplus
}
#endif
#endif /* GNRC_RPL_SRH_H_ */
/** @} */