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88 lines
2.3 KiB
C
88 lines
2.3 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 General
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* Public License v2.1. See the file LICENSE in the top level directory for
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* more details.
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*/
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/**
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* @defgroup net_gnrc_ipv6_ext IPv6 extension headers.
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* @ingroup net_gnrc_ipv6
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* @brief Implementation of IPv6 extension headers
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* @see <a href="https://tools.ietf.org/html/rfc2460#section-4">
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* RFC 2460, section 4
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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 IPv6 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 GNRC_IPV6_EXT_H
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#define GNRC_IPV6_EXT_H
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "kernel_types.h"
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#include "net/gnrc/pkt.h"
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#include "net/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 Demultiplex extension headers according to @p nh.
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*
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* About `current` and `pkt`:
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*
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* current pkt
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* | |
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* v v
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* IPv6 <- IPv6_EXT <- IPv6_EXT <- UNDEF
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*
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* This situation may happen when the packet has a source routing extension
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* header (RFC 6554), and the packet is forwarded from an interface to another.
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*
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* @internal
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*
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* @param[in] iface The receiving interface.
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* @param[in] current A snip to process.
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* @param[in] pkt A packet.
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* @param[in] nh A protocol number (see @ref net_protnum) of the current snip.
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*/
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void gnrc_ipv6_ext_demux(kernel_pid_t iface,
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gnrc_pktsnip_t *current,
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gnrc_pktsnip_t *pkt,
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uint8_t nh);
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/**
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* @brief Builds an extension header for sending.
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*
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* @param[in] ipv6 The IPv6 header. Can be NULL.
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* @param[in] next The next header. Must be a successor to @p ipv6 if it is
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* not NULL.
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* @param[in] nh @ref net_protnum of the next header.
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* @param[in] size Size of the extension header.
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*
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* @return The extension header on success.
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* @return NULL, on error.
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*/
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gnrc_pktsnip_t *gnrc_ipv6_ext_build(gnrc_pktsnip_t *ipv6, gnrc_pktsnip_t *next,
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uint8_t nh, size_t size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GNRC_IPV6_EXT_H */
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/**
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* @}
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*/
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