/* we can only demand they close their outbound streams */
/* we can request they start to close inbound (ie ask us to shut our outbound */
/* DCEP treats streams as bi-directional - so this is somewhat of an inpedance mis-match */
/* resulting in a temporary 'half closed' state */
/* mull this over.... */
public ReConfigChunk makeClose(SCTPStream st)
{
ReConfigChunk ret = null;
Logger.Debug("building reconfig so close stream " + st);
st.setClosing(true);
lock (listOfStreamsToReset) {
listOfStreamsToReset.Enqueue(st);
}
if (!timerIsRunning())
{
ret = makeSSNResets();
}
return(ret);
}
private ReConfigChunk makeSSNResets()
{
ReConfigChunk reply = new ReConfigChunk(); // create a new thing
Logger.Debug("closing streams n=" + listOfStreamsToReset.Count);
List <int> streamsL = new List <int>();
lock (listOfStreamsToReset) {
foreach (var s in listOfStreamsToReset)
{
if (s.InboundIsOpen())
{
streamsL.Add(s.getNum());
}
}
}
int[] streams = streamsL.ToArray();
if (streams.Length > 0)
{
OutgoingSSNResetRequestParameter rep = new OutgoingSSNResetRequestParameter(nextNearNo(), farSeqno - 1, assoc.getNearTSN());
rep.setStreams(streams);
reply.addParam(rep);
}
streamsL.Clear();
lock (listOfStreamsToReset) {
foreach (var s in listOfStreamsToReset)
{
if (s.OutboundIsOpen())
{
streamsL.Add(s.getNum());
}
}
}
streams = streamsL.ToArray();
if (streams.Length > 0)
{
IncomingSSNResetRequestParameter rep = new IncomingSSNResetRequestParameter(nextNearNo());
rep.setStreams(streams);
reply.addParam(rep);
}
Logger.Debug("reconfig chunk is " + reply.ToString());
return(reply);
}
/*
* https://tools.ietf.org/html/rfc6525
*/
public Chunk[] deal(ReConfigChunk rconf)
{
Chunk[] ret = new Chunk[1];
ReConfigChunk reply = null;
Logger.Debug("Got a reconfig message to deal with");
if (haveSeen(rconf))
{
// if not - is this a repeat
reply = getPrevious(rconf); // then send the same reply
}
if (reply == null)
{
// not a repeat then
reply = new ReConfigChunk(); // create a new thing
if (rconf.hasOutgoingReset())
{
OutgoingSSNResetRequestParameter oreset = rconf.getOutgoingReset();
int[] streams = oreset.getStreams();
if (streams.Length == 0)
{
streams = assoc.allStreams();
}
if (timerIsRunning())
{
markAsAcked(rconf);
}
// if we are behind, we are supposed to wait untill we catch up.
if (oreset.getLastAssignedTSN() > assoc.getCumAckPt())
{
Logger.Debug("Last assigned > farTSN " + oreset.getLastAssignedTSN() + " v " + assoc.getCumAckPt());
foreach (int s in streams)
{
SCTPStream defstr = assoc.getStream(s);
defstr.setDeferred(true);
}
ReconfigurationResponseParameter rep = new ReconfigurationResponseParameter();
rep.setSeq(oreset.getReqSeqNo());
rep.setResult(ReconfigurationResponseParameter.IN_PROGRESS);
reply.addParam(rep);
}
else
{
// somehow invoke this when TSN catches up ?!?! ToDo
Logger.Debug("we are up-to-date ");
ReconfigurationResponseParameter rep = new ReconfigurationResponseParameter();
rep.setSeq(oreset.getReqSeqNo());
int result = streams.Length > 0 ? ReconfigurationResponseParameter.SUCCESS_PERFORMED : ReconfigurationResponseParameter.SUCCESS_NOTHING_TO_DO;
rep.setResult((uint)result); // assume all good
foreach (int s in streams)
{
SCTPStream cstrm = assoc.delStream(s);
if (cstrm == null)
{
Logger.Error("Close a non existant stream");
rep.setResult(ReconfigurationResponseParameter.ERROR_WRONG_SSN);
break;
// bidriectional might be a problem here...
}
else
{
cstrm.reset();
}
}
reply.addParam(rep);
}
}
// ponder putting this in a second chunk ?
if (rconf.hasIncomingReset())
{
IncomingSSNResetRequestParameter ireset = rconf.getIncomingReset();
/*The Re-configuration
* Response Sequence Number of the Outgoing SSN Reset Request
* Parameter MUST be the Re-configuration Request Sequence Number
* of the Incoming SSN Reset Request Parameter. */
OutgoingSSNResetRequestParameter rep = new OutgoingSSNResetRequestParameter(nextNearNo(), ireset.getReqNo(), assoc.getNearTSN());
int[] streams = ireset.getStreams();
rep.setStreams(streams);
if (streams.Length == 0)
{
streams = assoc.allStreams();
}
foreach (int s in streams)
{
SCTPStream st = assoc.getStream(s);
if (st != null)
{
st.setClosing(true);
}
}
reply.addParam(rep);
// set outbound timer running here ???
Logger.Debug("Ireset " + ireset);
}
}
if (reply.hasParam())
{
ret[0] = reply;
// todo should add sack here
Logger.Debug("about to reply with " + reply.ToString());
}
else
{
ret = null;
}
return(ret);
}
private void markAsAcked(ReConfigChunk rconf)
{
// ooh, what does this button do ??? To Do
}
private ReConfigChunk getPrevious(ReConfigChunk rconf)
{
return(rconf.sameAs(recentInbound) ? sentReply : null);
}
private bool haveSeen(ReConfigChunk rconf)
{
return(rconf.sameAs(recentInbound));
}
