356 lines
10 KiB
C
356 lines
10 KiB
C
/*
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*
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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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*
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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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* $Id: frame802154.c,v 1.3 2009/09/09 21:08:46 adamdunkels Exp $
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*/
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/*
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* \brief This file is where the main functions that relate to frame
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* manipulation will reside.
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*/
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/**
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* \addtogroup frame802154
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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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#include "sys/cc.h"
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#include "net/mac/frame802154.h"
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#include <string.h>
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/**
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* \brief Structure that contains the lengths of the various addressing and security fields
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* in the 802.15.4 header. This structure is used in \ref frame802154_create()
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*/
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typedef struct {
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uint8_t dest_pid_len; /**< Length (in bytes) of destination PAN ID field */
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uint8_t dest_addr_len; /**< Length (in bytes) of destination address field */
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uint8_t src_pid_len; /**< Length (in bytes) of source PAN ID field */
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uint8_t src_addr_len; /**< Length (in bytes) of source address field */
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uint8_t aux_sec_len; /**< Length (in bytes) of aux security header field */
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} field_length_t;
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/*----------------------------------------------------------------------------*/
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CC_INLINE static uint8_t
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addr_len(uint8_t mode)
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{
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switch(mode) {
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case FRAME802154_SHORTADDRMODE: /* 16-bit address */
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return 2;
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case FRAME802154_LONGADDRMODE: /* 64-bit address */
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return 8;
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default:
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return 0;
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}
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}
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/*----------------------------------------------------------------------------*/
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static void
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field_len(frame802154_t *p, field_length_t *flen)
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{
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/* init flen to zeros */
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memset(flen, 0, sizeof(field_length_t));
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/* Determine lengths of each field based on fcf and other args */
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if(p->fcf.dest_addr_mode & 3) {
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flen->dest_pid_len = 2;
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}
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if(p->fcf.src_addr_mode & 3) {
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flen->src_pid_len = 2;
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}
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/* Set PAN ID compression bit if src pan id matches dest pan id. */
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if(p->fcf.dest_addr_mode & 3 && p->fcf.src_addr_mode & 3 &&
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p->src_pid == p->dest_pid) {
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p->fcf.panid_compression = 1;
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/* compressed header, only do dest pid */
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flen->src_pid_len = 0;
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} else {
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p->fcf.panid_compression = 0;
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}
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/* determine address lengths */
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flen->dest_addr_len = addr_len(p->fcf.dest_addr_mode & 3);
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flen->src_addr_len = addr_len(p->fcf.src_addr_mode & 3);
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/* Aux security header */
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if(p->fcf.security_enabled & 1) {
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/* TODO Aux security header not yet implemented */
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#if 0
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switch(p->aux_hdr.security_control.key_id_mode) {
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case 0:
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flen->aux_sec_len = 5; /* minimum value */
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break;
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case 1:
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flen->aux_sec_len = 6;
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break;
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case 2:
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flen->aux_sec_len = 10;
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break;
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case 3:
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flen->aux_sec_len = 14;
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break;
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default:
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break;
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}
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#endif
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}
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Calculates the length of the frame header. This function is
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* meant to be called by a higher level function, that interfaces to a MAC.
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*
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* \param p Pointer to frame802154_t_t struct, which specifies the
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* frame to send.
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*
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* \return The length of the frame header.
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*/
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uint8_t
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frame802154_hdrlen(frame802154_t *p)
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{
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field_length_t flen;
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field_len(p, &flen);
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return 3 + flen.dest_pid_len + flen.dest_addr_len +
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flen.src_pid_len + flen.src_addr_len + flen.aux_sec_len;
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Creates a frame for transmission over the air. This function is
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* meant to be called by a higher level function, that interfaces to a MAC.
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*
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* \param p Pointer to frame802154_t struct, which specifies the
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* frame to send.
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*
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* \param buf Pointer to the buffer to use for the frame.
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*
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* \param buf_len The length of the buffer to use for the frame.
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*
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* \return The length of the frame header or 0 if there was
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* insufficient space in the buffer for the frame headers.
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*/
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uint8_t
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frame802154_create(frame802154_t *p, uint8_t *buf, uint8_t buf_len)
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{
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int c;
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field_length_t flen;
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uint8_t *tx_frame_buffer;
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uint8_t pos;
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field_len(p, &flen);
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if(3 + flen.dest_pid_len + flen.dest_addr_len +
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flen.src_pid_len + flen.src_addr_len + flen.aux_sec_len > buf_len) {
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/* Too little space for headers. */
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return 0;
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}
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/* OK, now we have field lengths. Time to actually construct */
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/* the outgoing frame, and store it in tx_frame_buffer */
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tx_frame_buffer = buf;
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tx_frame_buffer[0] = (p->fcf.frame_type & 7) |
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((p->fcf.security_enabled & 1) << 3) |
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((p->fcf.frame_pending & 1) << 4) |
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((p->fcf.ack_required & 1) << 5) |
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((p->fcf.panid_compression & 1) << 6);
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tx_frame_buffer[1] = ((p->fcf.dest_addr_mode & 3) << 2) |
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((p->fcf.frame_version & 3) << 4) |
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((p->fcf.src_addr_mode & 3) << 6);
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/* sequence number */
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tx_frame_buffer[2] = p->seq;
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pos = 3;
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/* Destination PAN ID */
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if(flen.dest_pid_len == 2) {
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tx_frame_buffer[pos++] = p->dest_pid & 0xff;
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tx_frame_buffer[pos++] = (p->dest_pid >> 8) & 0xff;
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}
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/* Destination address */
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for(c = flen.dest_addr_len; c > 0; c--) {
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tx_frame_buffer[pos++] = p->dest_addr.u8[c - 1];
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}
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/* Source PAN ID */
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if(flen.src_pid_len == 2) {
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tx_frame_buffer[pos++] = p->src_pid & 0xff;
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tx_frame_buffer[pos++] = (p->src_pid >> 8) & 0xff;
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}
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/* Source address */
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for(c = flen.src_addr_len; c > 0; c--) {
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tx_frame_buffer[pos++] = p->src_addr.u8[c - 1];
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}
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/* Aux header */
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if(flen.aux_sec_len) {
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/* TODO Aux security header not yet implemented */
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/* pos += flen.aux_sec_len; */
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}
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return pos;
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}
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/*----------------------------------------------------------------------------*/
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/**
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* \brief Parses an input frame. Scans the input frame to find each
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* section, and stores the information of each section in a
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* frame802154_t structure.
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*
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* \param data The input data from the radio chip.
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* \param len The size of the input data
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* \param pf The frame802154_t struct to store the parsed frame information.
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*/
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uint8_t
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frame802154_parse(uint8_t *data, uint8_t len, frame802154_t *pf)
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{
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uint8_t *p;
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frame802154_fcf_t fcf;
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uint8_t c;
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if(len < 3) {
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return 0;
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}
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p = data;
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/* decode the FCF */
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fcf.frame_type = p[0] & 7;
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fcf.security_enabled = (p[0] >> 3) & 1;
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fcf.frame_pending = (p[0] >> 4) & 1;
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fcf.ack_required = (p[0] >> 5) & 1;
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fcf.panid_compression = (p[0] >> 6) & 1;
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fcf.dest_addr_mode = (p[1] >> 2) & 3;
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fcf.frame_version = (p[1] >> 4) & 3;
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fcf.src_addr_mode = (p[1] >> 6) & 3;
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/* copy fcf and seqNum */
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memcpy(&pf->fcf, &fcf, sizeof(frame802154_fcf_t));
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pf->seq = p[2];
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p += 3; /* Skip first three bytes */
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/* Destination address, if any */
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if(fcf.dest_addr_mode) {
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/* Destination PAN */
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pf->dest_pid = p[0] + (p[1] << 8);
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p += 2;
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/* Destination address */
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/* l = addr_len(fcf.dest_addr_mode); */
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/* for(c = 0; c < l; c++) { */
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/* pf->dest_addr.u8[c] = p[l - c - 1]; */
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/* } */
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/* p += l; */
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if(fcf.dest_addr_mode == FRAME802154_SHORTADDRMODE) {
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rimeaddr_copy(&(pf->dest_addr), &rimeaddr_null);
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pf->dest_addr.u8[0] = p[1];
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pf->dest_addr.u8[1] = p[0];
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p += 2;
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} else if(fcf.dest_addr_mode == FRAME802154_LONGADDRMODE) {
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for(c = 0; c < 8; c++) {
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pf->dest_addr.u8[c] = p[7 - c];
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}
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p += 8;
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}
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} else {
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rimeaddr_copy(&(pf->dest_addr), &rimeaddr_null);
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pf->dest_pid = 0;
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}
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/* Source address, if any */
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if(fcf.src_addr_mode) {
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/* Source PAN */
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if(!fcf.panid_compression) {
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pf->src_pid = p[0] + (p[1] << 8);
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p += 2;
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} else {
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pf->src_pid = pf->dest_pid;
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}
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/* Source address */
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/* l = addr_len(fcf.src_addr_mode); */
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/* for(c = 0; c < l; c++) { */
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/* pf->src_addr.u8[c] = p[l - c - 1]; */
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/* } */
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/* p += l; */
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if(fcf.src_addr_mode == FRAME802154_SHORTADDRMODE) {
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rimeaddr_copy(&(pf->src_addr), &rimeaddr_null);
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pf->src_addr.u8[0] = p[1];
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pf->src_addr.u8[1] = p[0];
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p += 2;
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} else if(fcf.src_addr_mode == FRAME802154_LONGADDRMODE) {
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for(c = 0; c < 8; c++) {
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pf->src_addr.u8[c] = p[7 - c];
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}
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p += 8;
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}
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} else {
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rimeaddr_copy(&(pf->src_addr), &rimeaddr_null);
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pf->src_pid = 0;
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}
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if(fcf.security_enabled) {
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/* TODO aux security header, not yet implemented */
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/* return 0; */
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}
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/* header length */
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c = p - data;
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/* payload length */
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pf->payload_len = len - c;
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/* payload */
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pf->payload = p;
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/* return header length if successful */
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return c > len ? 0 : c;
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}
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/** \} */
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