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Filter duplicate packets

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This commit is contained in:
adamdunkels 2010-06-14 06:52:41 +00:00
parent a6bd51f361
commit 8d1680fed5
1 changed files with 31 additions and 1 deletions
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32
core/net/mac/xmac.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: xmac.c,v 1.56 2010/04/30 07:32:39 adamdunkels Exp $
* $Id: xmac.c,v 1.57 2010/06/14 06:52:41 adamdunkels Exp $
*/
/**
@ -220,6 +220,15 @@ static rtimer_clock_t stream_until;
#define MIN(a, b) ((a) < (b)? (a) : (b))
#endif /* MIN */
struct seqno {
rimeaddr_t sender;
uint8_t seqno;
};
#define MAX_SEQNOS 8
static struct seqno received_seqnos[MAX_SEQNOS];
/*---------------------------------------------------------------------------*/
static void
on(void)
@ -717,6 +726,27 @@ input_packet(void)
asleep. */
off();
/* Check for duplicate packet by comparing the sequence number
of the incoming packet with the last few ones we saw. */
{
int i;
for(i = 0; i < MAX_SEQNOS; ++i) {
if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == received_seqnos[i].seqno &&
rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
&received_seqnos[i].sender)) {
/* Drop the packet. */
return;
}
}
for(i = MAX_SEQNOS - 1; i > 0; --i) {
memcpy(&received_seqnos[i], &received_seqnos[i - 1],
sizeof(struct seqno));
}
received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
rimeaddr_copy(&received_seqnos[0].sender,
packetbuf_addr(PACKETBUF_ADDR_SENDER));
}
#if XMAC_CONF_COMPOWER
/* Accumulate the power consumption for the packet reception. */
compower_accumulate(&current_packet);