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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_ipv6_ext IPv6 extension headers
* @ingroup net_ipv6
* @brief Provides IPv6 extension header definitions and helper functions.
* @{
*
* @file
* @brief IPv6 extension header definitions.
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef IPV6_EXT_H_
#define IPV6_EXT_H_
#include <stdint.h>
#include "net/ipv6/ext/rh.h"
#ifdef __cplusplus
extern "C" {
#endif
#define IPV6_EXT_LEN_UNIT (8U) /**< Unit in byte for the extension header's
* length field */
/**
* @brief IPv6 extension headers.
*
* @see <a href="https://tools.ietf.org/html/rfc2460#section-4">
* RFC 2460, section 4.1
* </a>
*/
typedef struct __attribute__((packed)) {
uint8_t nh; /**< next header */
uint8_t len; /**< length in 8 octets without first octet */
} ipv6_ext_t;
/**
* @brief Gets the next extension header in a packet.
*
* @param[in] ext The current extension header.
*
* @return The next extension header.
*/
static inline ipv6_ext_t *ipv6_ext_get_next(ipv6_ext_t *ext)
{
return (ipv6_ext_t *)((uint8_t *)(ext) + (ext->len * IPV6_EXT_LEN_UNIT) +
IPV6_EXT_LEN_UNIT);
}
#ifdef __cplusplus
}
#endif
#endif /* IPV6_EXT_H_ */
/** @} */
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