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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_ipv6_ext IPv6 extension headers.
* @ingroup net_gnrc_ipv6
* @brief Implementation of IPv6 extension headers
* @see <a href="https://tools.ietf.org/html/rfc2460#section-4">
* RFC 2460, section 4
* </a>
* @{
*
* @file
* @brief Definititions for IPv6 extension headers
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef GNRC_IPV6_EXT_H_
#define GNRC_IPV6_EXT_H_
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include "kernel_types.h"
#include "net/gnrc/pkt.h"
#include "net/ipv6/ext.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Demultiplex extension headers according to @p nh.
*
* About `current` and `pkt`:
*
* current pkt
* | |
* v v
* IPv6 <- IPv6_EXT <- IPv6_EXT <- UNDEF
*
* This situation may happen when the packet has a source routing extension
* header (RFC 6554), and the packet is forwarded from an interface to another.
*
* @internal
*
* @param[in] iface The receiving interface.
* @param[in] current A snip to process.
* @param[in] pkt A packet.
* @param[in] nh A protocol number (see @ref net_protnum) of the current snip.
*/
void gnrc_ipv6_ext_demux(kernel_pid_t iface,
gnrc_pktsnip_t *current,
gnrc_pktsnip_t *pkt,
uint8_t nh);
/**
* @brief Builds an extension header for sending.
*
* @param[in] ipv6 The IPv6 header. Can be NULL.
* @param[in] next The next header. Must be a successor to @p ipv6 if it is
* not NULL.
* @param[in] nh @ref net_protnum of the next header.
* @param[in] size Size of the extension header.
*
* @return The extension header on success.
* @return NULL, on error.
*/
gnrc_pktsnip_t *gnrc_ipv6_ext_build(gnrc_pktsnip_t *ipv6, gnrc_pktsnip_t *next,
uint8_t nh, size_t size);
#ifdef __cplusplus
}
#endif
#endif /* GNRC_IPV6_EXT_H_ */
/**
* @}
*/
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