mac-seqno: add a lifetime to sequence numbers in history
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@ -51,9 +51,16 @@
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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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@ -66,6 +73,7 @@ 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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@ -75,8 +83,14 @@ mac_sequence_is_duplicate(void)
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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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/* Duplicate packet. */
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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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@ -103,6 +117,7 @@ mac_sequence_register_seqno(void)
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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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