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64 lines
1.5 KiB
C
64 lines
1.5 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_ipv6_ext_rh IPv6 routing header extension
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* @ingroup net_ipv6_ext
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* @brief Implementation of IPv6 routing header extension.
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* @{
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*
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* @file
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* @brief Routing extension header definitions.
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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 IPV6_EXT_RH_H_
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#define IPV6_EXT_RH_H_
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#include <stdint.h>
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#include "net/ipv6/addr.h"
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#include "net/ipv6/hdr.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 IPv6 routing extension header.
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*
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* @see <a href="https://tools.ietf.org/html/rfc2460#section-4.4">
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* RFC 2460, section 4.4
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* </a>
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*
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* @extends ipv6_ext_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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} ipv6_ext_rh_t;
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/**
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* @brief Extract next hop from the routing header of an IPv6 packet.
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*
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* @param[in] ipv6 An IPv6 packet.
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*
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* @return next hop on success, on success
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* @return NULL, if not found.
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*/
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ipv6_addr_t *ipv6_ext_rh_next_hop(ipv6_hdr_t *ipv6);
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#ifdef __cplusplus
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}
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#endif
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#endif /* IPV6_EXT_RH_H_ */
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/** @} */
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