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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_sixlowpan_ctx Contexts for 6LoWPAN address compression
* @ingroup net_gnrc_sixlowpan
* @brief Context buffer for stateful 6LoWPAN address compression
* @see <a href="https://tools.ietf.org/html/rfc6282#section-3.1.2">
* RFC 6282, section 3.1.2
* </a>
* @see <a href="http://tools.ietf.org/html/rfc6775#section-4.2">
* RFC 6775, section 4.2
* </a>
* @{
*
* @file
* @brief Context buffer definitions
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef GNRC_SIXLOWPAN_CTX_H_
#define GNRC_SIXLOWPAN_CTX_H_
#include <inttypes.h>
#include <stdbool.h>
#include "net/ipv6/addr.h"
#ifdef __cplusplus
extern "C" {
#endif
#define GNRC_SIXLOWPAN_CTX_SIZE (16) /**< maximum number of entries in
* context buffer */
/**
* @{
* @name Context flags.
* @brief Flags to set in gnrc_sixlowpan_ctx_t::flags_id.
*/
#define GNRC_SIXLOWPAN_CTX_FLAGS_CID_MASK (0x0f) /**< mask for the Context ID. */
#define GNRC_SIXLOWPAN_CTX_FLAGS_COMP (0x10) /**< Use context for compression */
/**
* @}
*/
/**
* @brief Entry in the 6LoWPAN context buffer.
*/
typedef struct {
ipv6_addr_t prefix; /**< The prefix associated to this context. */
uint8_t prefix_len; /**< Length of gnrc_sixlowpan_ctx_t::prefix in bit. */
/**
* @brief 4-bit flags, 4-bit Context ID.
*
* @note This needs to be here to easily translate prefixes to
* ID.
*
* @details The flags are defined as above.
*/
uint8_t flags_id;
/**
* @brief Lifetime in minutes this context is valid.
*
* @see <a href="http://tools.ietf.org/html/rfc6775#section-4.2">
* 6LoWPAN Context Option
* </a>
*/
uint16_t ltime;
} gnrc_sixlowpan_ctx_t;
/**
* @brief Gets a context matching the given IPv6 address best with its prefix.
*
* @param[in] addr An IPv6 address.
*
* @return The context associated with the best prefix for @p addr.
* @return NULL if there is no such context.
*/
gnrc_sixlowpan_ctx_t *gnrc_sixlowpan_ctx_lookup_addr(const ipv6_addr_t *addr);
/**
* @brief Gets context by ID.
*
* @param[in] id A context ID.
*
* @return The context associated with @p id.
* @return NULL if there is no such context.
*/
gnrc_sixlowpan_ctx_t *gnrc_sixlowpan_ctx_lookup_id(uint8_t id);
/**
* @brief Updates (or adds if currently not registered) a context
*
* @param[in] id The ID for the context.
* Must be < @ref GNRC_SIXLOWPAN_CTX_SIZE.
* @param[in] prefix The prefix for the context.
* @param[in] prefix_len Length of @p prefix in bits. Must be > 0.
* @param[in] ltime New lifetime of the context. @p comp will be
* implicitly set to `false` if @p ltime == 0.
* @param[in] comp Use for compression if true, do not use for
* compression, but still for decompression if false.
*
* @return The new context on success.
* @return NULL, on error or on removal.
*/
gnrc_sixlowpan_ctx_t *gnrc_sixlowpan_ctx_update(uint8_t id, const ipv6_addr_t *prefix,
uint8_t prefix_len, uint16_t ltime,
bool comp);
#ifdef MODULE_GNRC_SIXLOWPAN_CTX
/**
* @brief Removes context.
*
* @param[in] id A context ID.
*/
static inline void gnrc_sixlowpan_ctx_remove(uint8_t id)
{
gnrc_sixlowpan_ctx_lookup_id(id)->prefix_len = 0;
}
#endif
#ifdef TEST_SUITES
/**
* @brief Resets the whole context buffer.
*/
void gnrc_sixlowpan_ctx_reset(void);
#endif
#ifdef __cplusplus
}
#endif
#endif /* GNRC_SIXLOWPAN_CTX_H_ */
/** @} */
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