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Hi,
I'm working on some improvements on SCTP regarding duplicate tsn reports.
On the function "rtx_process_sack", after processing the tsn's on
the gap report, I process the tsn on the duplicate report. Well, for
simplicity, I do:

for each tsn on the duplicate report:
find the tsn initial destination or last destination
do something

Here is some code:

USHORT num_of_gaps = ntohs(sack->num_of_fragments);
USHORT num_of_dups = ntohs(sack->num_of_duplicates);
int pos = 0;
while (pos < num_of_dups) {
int index = (num_of_gaps * sizeof(fragment)) + (pos *
sizeof(duplicate));
duplicate * dup = (duplicate *) & (sack->fragments_and_dups[index]);
UINT dup_tsn = ntohl(dup->duplicate_tsn);
short destination = rrsctp_initial_destination(dup_tsn);
if (destination != -1) {
// do something !
} else {
// print ERROR
}
}


And here is the code of rrsctp_initial_destination:

short rrsctp_initial_destination(UINT tsn)
{
short ret = -1;
GList * tmp = NULL;
rtx_buffer * reliableTransfer = mdi_readReliableTransfer();
tmp = g_list_first(reliableTransfer->chunk_list);
while (tmp != NULL) {
chunk_data * data_chunk = (chunk_data *) tmp->data;
if (data_chunk->chunk_tsn == tsn) {
ret = data_chunk->initial_destination == -1 ?
data_chunk->last_destination : data_chunk->initial_destination;
break;
}
tmp = g_list_next(tmp);
}
return ret;
}


Well, I'm having a problem. The problem is that chunk_list of the
reliableTransfer don't contain the tsn on the duplicate report.
Where can I get the chunk list of tsn that de duplicate report show/reports?
Should the chunk_list of the reliableTransfer contain tsn on the
duplicate report?
When are tsn remove from the chunk_list of the reliableTransfer?
TIA
Regards,
Julio



--
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Julio Kriger
mailto:juliokriger AT gmail.com

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• [SCTP-Discussion] duplicate tsn reports and process sack, Julio Kriger, 07/17/2005

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