125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
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* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* MAC sequence numbers management
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* \author
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* Adam Dunkels <adam@sics.se>
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* Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
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*/
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#include <string.h>
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#include "contiki-net.h"
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#include "net/mac/mac-sequence.h"
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#include "net/packetbuf.h"
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#include "net/rime/rime.h"
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struct seqno {
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linkaddr_t sender;
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clock_time_t timestamp;
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uint8_t seqno;
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};
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#ifdef NETSTACK_CONF_MAC_SEQNO_MAX_AGE
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#define SEQNO_MAX_AGE NETSTACK_CONF_MAC_SEQNO_MAX_AGE
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#else /* NETSTACK_CONF_MAC_SEQNO_MAX_AGE */
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#define SEQNO_MAX_AGE (20 * CLOCK_SECOND)
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#endif /* NETSTACK_CONF_MAC_SEQNO_MAX_AGE */
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#ifdef NETSTACK_CONF_MAC_SEQNO_HISTORY
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#define MAX_SEQNOS NETSTACK_CONF_MAC_SEQNO_HISTORY
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#else /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
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#define MAX_SEQNOS 16
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#endif /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
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static struct seqno received_seqnos[MAX_SEQNOS];
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/*---------------------------------------------------------------------------*/
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int
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mac_sequence_is_duplicate(void)
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{
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int i;
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clock_time_t now = clock_time();
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/*
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* Check for duplicate packet by comparing the sequence number of the incoming
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* packet with the last few ones we saw.
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*/
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for(i = 0; i < MAX_SEQNOS; ++i) {
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if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
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&received_seqnos[i].sender)) {
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if(packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO) == received_seqnos[i].seqno) {
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#if SEQNO_MAX_AGE > 0
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if(now - received_seqnos[i].timestamp <= SEQNO_MAX_AGE) {
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/* Duplicate packet. */
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return 1;
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}
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#else /* SEQNO_MAX_AGE > 0 */
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return 1;
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#endif /* SEQNO_MAX_AGE > 0 */
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}
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break;
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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void
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mac_sequence_register_seqno(void)
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{
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int i, j;
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/* Locate possible previous sequence number for this address. */
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for(i = 0; i < MAX_SEQNOS; ++i) {
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if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
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&received_seqnos[i].sender)) {
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i++;
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break;
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}
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}
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/* Keep the last sequence number for each address as per 802.15.4e. */
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for(j = i - 1; j > 0; --j) {
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memcpy(&received_seqnos[j], &received_seqnos[j - 1], sizeof(struct seqno));
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}
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received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO);
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received_seqnos[0].timestamp = clock_time();
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linkaddr_copy(&received_seqnos[0].sender,
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packetbuf_addr(PACKETBUF_ADDR_SENDER));
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}
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/*---------------------------------------------------------------------------*/
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