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/*
* Copyright (C) 2015-16 Freie Universitรคt Berlin
*
* 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_ieee802154 IEEE802.15.4
* @ingroup net
* @brief IEEE802.15.4 header definitions and utility functions
* @{
*
* @file
* @brief IEEE 802.14.4 header definitions
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef IEEE802154_H_
#define IEEE802154_H_
#include <stdint.h>
#include <stdlib.h>
#include "byteorder.h"
#include "net/eui64.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief IEEE 802.15.4 address lengths
* @{
*/
#define IEEE802154_SHORT_ADDRESS_LEN (2U) /**< short (16-bit) address */
#define IEEE802154_LONG_ADDRESS_LEN (8U) /**< long address (EUI-64) */
/**
* @}
*/
/**
* @brief IEEE802.15.4 FCF field definitions
* @{
*/
#define IEEE802154_MAX_HDR_LEN (23U)
#define IEEE802154_FCF_LEN (2U)
#define IEEE802154_FCS_LEN (2U)
#define IEEE802154_FCF_TYPE_MASK (0x07)
#define IEEE802154_FCF_TYPE_BEACON (0x00)
#define IEEE802154_FCF_TYPE_DATA (0x01)
#define IEEE802154_FCF_TYPE_ACK (0x02)
#define IEEE802154_FCF_TYPE_MACCMD (0x03)
#define IEEE802154_FCF_SECURITY_EN (0x08) /**< enable security */
#define IEEE802154_FCF_FRAME_PEND (0x10) /**< follow-up frame is pending */
#define IEEE802154_FCF_ACK_REQ (0x20) /**< acknowledgement requested from receiver */
#define IEEE802154_FCF_PAN_COMP (0x40) /**< compress source PAN ID */
#define IEEE802154_FCF_DST_ADDR_MASK (0x0c)
#define IEEE802154_FCF_DST_ADDR_VOID (0x00) /**< no destination address */
#define IEEE802154_FCF_DST_ADDR_RESV (0x04) /**< reserved address mode */
#define IEEE802154_FCF_DST_ADDR_SHORT (0x08) /**< destination address length is 2 */
#define IEEE802154_FCF_DST_ADDR_LONG (0x0c) /**< destination address length is 8 */
#define IEEE802154_FCF_VERS_MASK (0x30)
#define IEEE802154_FCF_VERS_V0 (0x00)
#define IEEE802154_FCF_VERS_V1 (0x10)
#define IEEE802154_FCF_SRC_ADDR_MASK (0xc0)
#define IEEE802154_FCF_SRC_ADDR_VOID (0x00) /**< no source address */
#define IEEE802154_FCF_SRC_ADDR_RESV (0x40) /**< reserved address mode */
#define IEEE802154_FCF_SRC_ADDR_SHORT (0x80) /**< source address length is 2 */
#define IEEE802154_FCF_SRC_ADDR_LONG (0xc0) /**< source address length is 8 */
/** @} */
/**
* @brief Channel ranges
* @{
*/
/**
* @brief Minimum channel for sub-GHz band
*/
#define IEEE802154_CHANNEL_MIN_SUBGHZ (0U)
#define IEEE802154_CHANNEL_MAX_SUBGHZ (10U) /**< Maximum channel for sub-GHz band */
#define IEEE802154_CHANNEL_MIN (11U) /**< Minimum channel for 2.4 GHz band */
#define IEEE802154_CHANNEL_MAX (26U) /**< Maximum channel for 2.4 GHz band */
/** @} */
#define IEEE802154_FRAME_LEN_MAX (127U) /**< maximum frame length */
/**
* @brief Special address defintions
* @{
*/
/**
* @brief Static initializer for broadcast address
*/
#define IEEE802154_ADDR_BCAST { 0xff, 0xff }
/**
* @brief Length in byte of @ref IEEE802154_ADDR_BCAST
*/
#define IEEE802154_ADDR_BCAST_LEN (IEEE802154_SHORT_ADDRESS_LEN)
/**
* @brief Broadcast address
*/
extern const uint8_t ieee802154_addr_bcast[IEEE802154_ADDR_BCAST_LEN];
/** @} */
/**
* @{
* @name Default values
* @brief Default values for devices to choose
*/
#ifndef IEEE802154_DEFAULT_SUBGHZ_CHANNEL
#define IEEE802154_DEFAULT_SUBGHZ_CHANNEL (5U)
#endif
#ifndef IEEE802154_DEFAULT_CHANNEL
#define IEEE802154_DEFAULT_CHANNEL (26U)
#endif
#ifndef IEEE802154_DEFAULT_PANID
#define IEEE802154_DEFAULT_PANID (0x0023U)
#endif
#ifndef IEEE802154_DEFAULT_TXPOWER
#define IEEE802154_DEFAULT_TXPOWER (0) /* in dBm */
#endif
/** @} */
/**
* @brief Initializes an IEEE 802.15.4 MAC frame header in @p buf.
*
* @pre Resulting header must fit in memory allocated at @p buf.
*
* @see IEEE Std 802.15.4-2011, 5.2.1 General MAC frame format.
*
* If @p dst is NULL the IEEE802154_FCF_ACK_REQ will be unset to prevent
* flooding the network.
*
* @param[out] buf Target memory for frame header.
* @param[in] src Source address for frame in network byteorder.
* May be NULL if @ref IEEE802154_FCF_SRC_ADDR_VOID is set
* in @p flags.
* @param[in] src_len Length of @p src. Legal values are:
* * 0 (will set @ref IEEE802154_FCF_SRC_ADDR_VOID in MHR)
* * 2 (will set @ref IEEE802154_FCF_SRC_ADDR_SHORT in MHR)
* * 8 (will set @ref IEEE802154_FCF_SRC_ADDR_LONG in MHR)
* @param[in] dst Destination address for frame in network byteorder.
* May be NULL if @ref IEEE802154_FCF_SRC_ADDR_VOID is set
* in @p flags.
* @param[in] dst_len Length of @p dst. Legal values are:
* * 0 (will set @ref IEEE802154_FCF_DST_ADDR_VOID in MHR)
* * 2 (will set @ref IEEE802154_FCF_DST_ADDR_SHORT in MHR)
* * 8 (will set @ref IEEE802154_FCF_DST_ADDR_LONG in MHR)
* @param[in] src_pan Source PAN ID in little-endian. May be 0 if
* @ref IEEE802154_FCF_PAN_COMP is set in @p flags.
* Otherwise, it will be ignored, when
* @ref IEEE802154_FCF_PAN_COMP is set.
* @param[in] dst_pan Destination PAN ID in little-endian.
* @param[in] flags Flags for the frame. These are interchangable with the
* first byte of the IEEE 802.15.4 FCF. This means that
* it encompasses the type values,
* @ref IEEE802154_FCF_SECURITY_EN,
* @ref IEEE802154_FCF_FRAME_PEND, and
* @ref IEEE802154_FCF_ACK_REQ.
* @param[in] seq Sequence number for frame.
*
* The version field in the FCF will be set implicitly to version 1.
*
* @return Size of frame header on success.
* @return 0, on error (flags set to unexpected state).
*/
size_t ieee802154_set_frame_hdr(uint8_t *buf, const uint8_t *src, size_t src_len,
const uint8_t *dst, size_t dst_len,
le_uint16_t src_pan, le_uint16_t dst_pan,
uint8_t flags, uint8_t seq);
/**
* @brief Get length of MAC header.
*
* @todo include security header implications
*
* @param[in] mhr MAC header.
*
* @return Length of MAC header on success.
* @return 0, on error (source mode or destination mode set to reserved).
*/
size_t ieee802154_get_frame_hdr_len(const uint8_t *mhr);
/**
* @brief Gets source address from MAC header.
*
* @pre (@p src != NULL) && (@p src_pan != NULL)
*
* @param[in] mhr MAC header.
* @param[out] src Source address in network byte order in MAC header.
* @param[out] src_pan Source PAN little-endian byte order in MAC header.
*
* @return Length of source address.
* @return -EINVAL, if @p mhr contains unexpected flags.
*/
int ieee802154_get_src(const uint8_t *mhr, uint8_t *src, le_uint16_t *src_pan);
/**
* @brief Gets destination address from MAC header.
*
* @pre (@p dst != NULL) && (@p dst_pan != NULL)
*
* @param[in] mhr MAC header.
* @param[out] dst Destination address in network byte order in MAC header.
* @param[out] dst_pan Destination PAN in little-endian byte order in MAC header.
*
* @return Length of destination address.
* @return -EINVAL, if @p mhr contains unexpected flags.
*/
int ieee802154_get_dst(const uint8_t *mhr, uint8_t *dst, le_uint16_t *dst_pan);
/**
* @brief Gets sequence number from MAC header.
*
* @pre length of allocated space at @p mhr > 3
*
* @param[in] mhr MAC header.
*
* @return The sequence number in @p mhr.
*/
static inline uint8_t ieee802154_get_seq(const uint8_t *mhr)
{
return mhr[2];
}
/**
* @brief Generates an IPv6 interface identifier from an IEEE 802.15.4 address.
*
* @pre (@p eui64 != NULL) && (@p addr != NULL)
* @see <a href="https://tools.ietf.org/html/rfc4944#section-6">
* RFC 4944, section 6
* </a>
* @see <a href="https://tools.ietf.org/html/rfc6282#section-3.2.2">
* RFC 6282, section 3.2.2
* </a>
*
* @param[out] eui64 The resulting EUI-64.
* @param[in] addr An IEEE 802.15.4 address.
* @param[in] addr_len The length of @p addr. Must be 2 (short address),
* 4 (PAN ID + short address), or 8 (long address).
*
* @return Copy of @p eui64 on success.
* @return NULL, if @p addr_len was of illegal length.
*/
static inline eui64_t *ieee802154_get_iid(eui64_t *eui64, const uint8_t *addr,
size_t addr_len)
{
int i = 0;
eui64->uint8[0] = eui64->uint8[1] = 0;
switch (addr_len) {
case 8:
eui64->uint8[0] = addr[i++] ^ 0x02;
eui64->uint8[1] = addr[i++];
eui64->uint8[2] = addr[i++];
eui64->uint8[3] = addr[i++];
eui64->uint8[4] = addr[i++];
eui64->uint8[5] = addr[i++];
eui64->uint8[6] = addr[i++];
eui64->uint8[7] = addr[i++];
break;
case 4:
eui64->uint8[0] = addr[i++] ^ 0x02;
eui64->uint8[1] = addr[i++];
case 2:
eui64->uint8[2] = 0;
eui64->uint8[3] = 0xff;
eui64->uint8[4] = 0xfe;
eui64->uint8[5] = 0;
eui64->uint8[6] = addr[i++];
eui64->uint8[7] = addr[i++];
break;
default:
return NULL;
}
return eui64;
}
#ifdef __cplusplus
}
#endif
#endif /* IEEE802154_H_ */
/** @} */
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