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200 lines
7.5 KiB
C
200 lines
7.5 KiB
C
/*
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* Copyright (c) 2008, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Additional fixes for AVR contributed by:
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* Colin O'Flynn coflynn@newae.com
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* Eric Gnoske egnoske@gmail.com
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* Blake Leverett bleverett@gmail.com
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* Mike Vidales mavida404@gmail.com
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* Kevin Brown kbrown3@uccs.edu
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* Nate Bohlmann nate@elfwerks.com
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*
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* Additional fixes for MSP430 contributed by:
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* Joakim Eriksson
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* Niclas Finne
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* Nicolas Tsiftes
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup net 802.15.4 frame creation and parsing
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* @{
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*/
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/**
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* \defgroup frame802154 802.15.4 frame creation and parsing
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* @{
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*/
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/**
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* \file
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* \brief 802.15.4 frame creation and parsing functions
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*
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* This file converts to and from a structure to a packed 802.15.4
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* frame.
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*
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*/
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/* Includes */
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#ifndef FRAME_802154_H
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#define FRAME_802154_H
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#include "contiki-conf.h"
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#ifdef IEEE802154_CONF_PANID
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#define IEEE802154_PANID IEEE802154_CONF_PANID
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#else /* IEEE802154_CONF_PANID */
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#define IEEE802154_PANID 0xABCD
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#endif /* IEEE802154_CONF_PANID */
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/* Macros & Defines */
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/** \brief These are some definitions of values used in the FCF. See the 802.15.4 spec for details.
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* \name FCF element values definitions
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* @{
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*/
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#define FRAME802154_BEACONFRAME (0x00)
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#define FRAME802154_DATAFRAME (0x01)
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#define FRAME802154_ACKFRAME (0x02)
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#define FRAME802154_CMDFRAME (0x03)
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#define FRAME802154_BEACONREQ (0x07)
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#define FRAME802154_IEEERESERVED (0x00)
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#define FRAME802154_NOADDR (0x00) /**< Only valid for ACK or Beacon frames. */
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#define FRAME802154_SHORTADDRMODE (0x02)
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#define FRAME802154_LONGADDRMODE (0x03)
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#define FRAME802154_NOBEACONS (0x0F)
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#define FRAME802154_BROADCASTADDR (0xFFFF)
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#define FRAME802154_BROADCASTPANDID (0xFFFF)
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#define FRAME802154_IEEE802154_2003 (0x00)
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#define FRAME802154_IEEE802154_2006 (0x01)
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#define FRAME802154_SECURITY_LEVEL_NONE (0)
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#define FRAME802154_SECURITY_LEVEL_MIC_32 (1)
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#define FRAME802154_SECURITY_LEVEL_MIC_64 (2)
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#define FRAME802154_SECURITY_LEVEL_MIC_128 (3)
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#define FRAME802154_SECURITY_LEVEL_ENC (4)
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#define FRAME802154_SECURITY_LEVEL_ENC_MIC_32 (5)
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#define FRAME802154_SECURITY_LEVEL_ENC_MIC_64 (6)
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#define FRAME802154_SECURITY_LEVEL_ENC_MIC_128 (7)
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#define FRAME802154_IMPLICIT_KEY (0)
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#define FRAME802154_1_BYTE_KEY_ID_MODE (1)
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#define FRAME802154_5_BYTE_KEY_ID_MODE (2)
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#define FRAME802154_9_BYTE_KEY_ID_MODE (3)
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/**
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* @brief The IEEE 802.15.4 frame has a number of constant/fixed fields that
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* can be counted to make frame construction and max payload
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* calculations easier.
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*
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* These include:
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* 1. FCF - 2 bytes - Fixed
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* 2. Sequence number - 1 byte - Fixed
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* 3. Addressing fields - 4 - 20 bytes - Variable
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* 4. Aux security header - 0 - 14 bytes - Variable
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* 5. CRC - 2 bytes - Fixed
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*/
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/**
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* \brief Defines the bitfields of the frame control field (FCF).
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*/
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typedef struct {
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uint8_t frame_type; /**< 3 bit. Frame type field, see 802.15.4 */
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uint8_t security_enabled; /**< 1 bit. True if security is used in this frame */
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uint8_t frame_pending; /**< 1 bit. True if sender has more data to send */
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uint8_t ack_required; /**< 1 bit. Is an ack frame required? */
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uint8_t panid_compression; /**< 1 bit. Is this a compressed header? */
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/* uint8_t reserved; */ /**< 3 bit. Unused bits */
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uint8_t dest_addr_mode; /**< 2 bit. Destination address mode, see 802.15.4 */
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uint8_t frame_version; /**< 2 bit. 802.15.4 frame version */
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uint8_t src_addr_mode; /**< 2 bit. Source address mode, see 802.15.4 */
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} frame802154_fcf_t;
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/** \brief 802.15.4 security control bitfield. See section 7.6.2.2.1 in 802.15.4 specification */
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typedef struct {
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uint8_t security_level; /**< 3 bit. security level */
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uint8_t key_id_mode; /**< 2 bit. Key identifier mode */
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uint8_t reserved; /**< 3 bit. Reserved bits */
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} frame802154_scf_t;
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typedef union {
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uint32_t u32;
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uint16_t u16[2];
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uint8_t u8[4];
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} frame802154_frame_counter_t;
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typedef union {
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uint16_t u16[4];
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uint8_t u8[8];
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} frame802154_key_source_t;
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/** \brief 802.15.4 Aux security header */
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typedef struct {
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frame802154_scf_t security_control; /**< Security control bitfield */
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frame802154_frame_counter_t frame_counter; /**< Frame counter, used for security */
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frame802154_key_source_t key_source; /**< Key Source subfield */
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uint8_t key_index; /**< Key Index subfield */
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} frame802154_aux_hdr_t;
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/** \brief Parameters used by the frame802154_create() function. These
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* parameters are used in the 802.15.4 frame header. See the 802.15.4
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* specification for details.
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*/
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typedef struct {
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/* The fields dest_addr and src_addr must come first to ensure they are aligned to the
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* CPU word size. Needed as they are accessed directly as linkaddr_t*. Note we cannot use
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* the type linkaddr_t directly here, as we always need 8 bytes, not LINKADDR_SIZE bytes. */
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uint8_t dest_addr[8]; /**< Destination address */
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uint8_t src_addr[8]; /**< Source address */
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frame802154_fcf_t fcf; /**< Frame control field */
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uint8_t seq; /**< Sequence number */
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uint16_t dest_pid; /**< Destination PAN ID */
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uint16_t src_pid; /**< Source PAN ID */
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frame802154_aux_hdr_t aux_hdr; /**< Aux security header */
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uint8_t *payload; /**< Pointer to 802.15.4 payload */
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int payload_len; /**< Length of payload field */
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} frame802154_t;
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/* Prototypes */
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int frame802154_hdrlen(frame802154_t *p);
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int frame802154_create(frame802154_t *p, uint8_t *buf);
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int frame802154_parse(uint8_t *data, int length, frame802154_t *pf);
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/** @} */
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#endif /* FRAME_802154_H */
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/** @} */
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/** @} */
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