/* * Copyright (C) 2015-16 Freie Universität 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 */ #ifndef IEEE802154_H_ #define IEEE802154_H_ #include #include #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 Flag for @ref ieee802154_set_frame_hdr to indicate to ignore @p dst * and @p dst_len and send broadcast. * @note This flag is RIOT internal and shall not be used in the FCF of * packets send over the air */ #define IEEE802154_BCAST (0x80) /** * @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, * @ref IEEE802154_FCF_ACK_REQ, and * @ref IEEE802154_FCF_PAN_COMP. * Additionally the @ref IEEE802154_BCAST flag can be set * do ignore @p dst and @p dst_len and just set `ff:ff` * (broadcast) as destination address * @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 * RFC 4944, section 6 * * @see * RFC 6282, section 3.2.2 * * * @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_ */ /** @} */