/* 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); }
/* * 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); }