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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_sixlowpan_nd 6LoWPAN Neighbor Discovery
* @ingroup net_sixlowpan
* @brief Message types and helper functions for Neighbor Discovery Optimization for 6LoWPAN
* (6LoWPAN-ND)
* @see <a href="https://tools.ietf.org/html/rfc6775#section-4">
* RFC 6775, section 4
* </a>
* @{
*
* @file
* @brief Message type and helper function definitions for 6LoWPAN-ND
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef SIXLOWPAN_ND_H_
#define SIXLOWPAN_ND_H_
#include <stdint.h>
#include "byteorder.h"
#include "net/eui64.h"
#include "net/ipv6/addr.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @{
* @name Lengths for fixed length options
* @brief Options don't use bytes as their length unit, but 8 bytes.
*/
#define SIXLOWPAN_ND_OPT_AR_LEN (2U)
#define SIXLOWPAN_ND_OPT_ABR_LEN (3U)
/**
* @}
*/
/**
* @{
* @name Status values for address registration option and DARs
*
* @see <a href="https://tools.ietf.org/html/rfc6775#section-4.1">
* RFC 6775, section 4.1
* </a>
*/
#define SIXLOWPAN_ND_STATUS_SUCCESS (0) /**< success */
#define SIXLOWPAN_ND_STATUS_DUP (1) /**< duplicate address */
#define SIXLOWPAN_ND_STATUS_NC_FULL (2) /**< neighbor cache full */
/**
* @}
*/
/**
* @{
* @name Flags for 6LoWPAN context option
*/
#define SIXLOWPAN_ND_OPT_6CTX_FLAGS_MASK (0x1f)
#define SIXLOWPAN_ND_OPT_6CTX_FLAGS_C (0x10) /**< valid for compression */
#define SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK (0x0f) /**< mask for CID */
/**
* @}
*/
/**
* @brief Duplicate address request and confirmation message format.
* @extends icmpv6_hdr_t
*
* @see <a href="https://tools.ietf.org/html/rfc6775#section-4.4">
* RFC 6775, section 4.4
* </a>
*/
typedef struct __attribute__((packed)) {
uint8_t type; /**< message type */
uint8_t code; /**< message code */
network_uint16_t csum; /**< checksum */
uint8_t status; /**< indicates registration status in DAC; must be 0 in DAR. */
uint8_t resv; /**< reserved field */
network_uint16_t ltime; /**< registration lifetime */
eui64_t eui64; /**< EUI-64 */
ipv6_addr_t addr; /**< registered address */
} sixlowpan_nd_da_t;
/**
* @brief Address registration option format
* @extends ndp_opt_t
*
* @see <a href="https://tools.ietf.org/html/rfc6775#section-4.1">
* RFC 6775, section 4.1
* </a>
*/
typedef struct __attribute__((packed)) {
uint8_t type; /**< option type */
uint8_t len; /**< length in units of 8 octets */
uint8_t status; /**< indicates registration status in NA response;
* must be 0 in NS messages */
uint8_t resv[3]; /**< reserved fields */
network_uint16_t ltime; /**< registration lifetime */
eui64_t eui64; /**< EUI-64 */
} sixlowpan_nd_opt_ar_t;
/**
* @brief 6LoWPAN context option format
* @extends ndp_opt_t
*
* @see <a href="https://tools.ietf.org/html/rfc6775#section-4.2">
* RFC 6775, section 4.2
* </a>
*/
typedef struct __attribute__((packed)) {
uint8_t type; /**< option type */
uint8_t len; /**< length in units of 8 octets */
uint8_t ctx_len; /**< context length */
uint8_t resv_c_cid; /**< 3-bit reserved, 1-bit c flag, 4 bit CID */
network_uint16_t resv; /**< reserved field */
network_uint16_t ltime; /**< valid lifetime */
} sixlowpan_nd_opt_6ctx_t;
/**
* @brief Authoritative border router option format
* @extends ndp_opt_t
*
* @see <a href="https://tools.ietf.org/html/rfc6775#section-4.3">
* RFC 6775, section 4.3
* </a>
*/
typedef struct __attribute__((packed)) {
uint8_t type; /**< option type */
uint8_t len; /**< length in units of 8 octets */
network_uint16_t vlow; /**< version low */
network_uint16_t vhigh; /**< version high */
network_uint16_t ltime; /**< valid lifetime */
ipv6_addr_t braddr; /**< 6LoWPAN border router address */
} sixlowpan_nd_opt_abr_t;
/**
* @brief Checks if a 6LoWPAN context in an 6LoWPAN context option is
* valid for compression.
*
* @param[in] ctx_opt A 6LoWPAN context option.
*
* @return true, if C bit is set in @p ctx_opt.
* @return false, if C bit is unset in @p ctx_opt.
*/
static inline bool sixlowpan_nd_opt_6ctx_is_comp(const sixlowpan_nd_opt_6ctx_t *ctx_opt)
{
return (bool)(ctx_opt->resv_c_cid & SIXLOWPAN_ND_OPT_6CTX_FLAGS_C);
}
/**
* @brief Gets a CID (context identifier) from a 6LoWPAN context option.
*
* @param[in] ctx_opt A 6LoWPAN context option.
*
* @return The CID in the 6LoWPAN context option @p ctx_opt.
*/
static inline uint8_t sixlowpan_nd_opt_6ctx_get_cid(const sixlowpan_nd_opt_6ctx_t *ctx_opt)
{
return (ctx_opt->resv_c_cid & SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK);
}
/**
* @brief Sets a CID (context identifier) for a 6LoWPAN context option.
*
* @param[out] ctx_opt A 6LoWPAN context option.
* @param[in] cid The CID for the 6LoWPAN context option.
*/
static inline void sixlowpan_nd_opt_6ctx_set_cid(sixlowpan_nd_opt_6ctx_t *ctx_opt, uint8_t cid)
{
ctx_opt->resv_c_cid &= ~SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK;
ctx_opt->resv_c_cid |= (SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK & cid);
}
#ifdef __cplusplus
}
#endif
#endif /* SIXLOWPAN_ND_H_ */
/** @} */
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