/// <summary> /// Adds broadcast/mesh headers and sends SDU to MAC /// </summary> /// <returns>True on success</returns> private void SendData( UInt16 orgAddr, UInt16 tgtAddr, UInt16 nextHopAddr, ref Frame sdu, Byte sduHandle, DataConfirmHandler handler) { bool success = false; if (orgAddr != cInvalidShortAddr) { bool ok = true; bool multicast = false; if (IsMulticast(tgtAddr)) { multicast = true; Messages6LoWPAN.BroadcastHeader bh = new Messages6LoWPAN.BroadcastHeader(); bh.seqNo = IncSeqNoBroadcast(); ok = bh.WriteToFrameHeader(sdu); } if (ok && (multicast || (tgtAddr != nextHopAddr))) { // add mesh header Messages6LoWPAN.MeshHeader mh = new Messages6LoWPAN.MeshHeader(); mh.originatorAddress = orgAddr; mh.finalAddress = tgtAddr; mh.HopsLeft = cDefaultHopLimit; ok = mh.WriteToFrameHeader(sdu); } if (ok) { MacDataRequest(nextHopAddr, ref sdu, sduHandle, handler); success = true; } } Frame.Release(ref sdu); if (!success && handler != null) handler.Invoke(_net, sduHandle, Status.Busy); }
private void HandleData( UInt16 srcAddr, UInt16 dstAddr, ref Frame sdu) { Messages6LoWPAN.Dispatch dispatch; if (!Messages6LoWPAN.GetType(sdu, out dispatch)) return; bool consume = false; // receive locally bool forward = false; // forward to another node UInt16 origAddr = srcAddr; // originator UInt16 targetAddr = dstAddr; // target bool haveMeshHeader = false; Messages6LoWPAN.MeshHeader mh = new Messages6LoWPAN.MeshHeader(); if (dispatch == Messages6LoWPAN.Dispatch.Mesh) { if (!mh.ReadFromFrameHeader(sdu) || !Messages6LoWPAN.GetType(sdu, out dispatch)) return; haveMeshHeader = true; origAddr = mh.originatorAddress; targetAddr = mh.finalAddress; } bool haveBroadcastHeader = false; Messages6LoWPAN.BroadcastHeader bh = new Messages6LoWPAN.BroadcastHeader(); if (dispatch == Messages6LoWPAN.Dispatch.IpPacket && bh.ReadFromFrameHeader(sdu)) { haveBroadcastHeader = true; bool usefull = _routingTable.CheckBroadcastSeqNo(origAddr, bh.seqNo) && (origAddr != _addrShort); if (!usefull || !haveMeshHeader || !Messages6LoWPAN.GetType(sdu, out dispatch)) return; } bool multicast = IsMulticast(targetAddr); consume = (targetAddr == _addrShort || multicast); forward = (targetAddr != _addrShort || multicast) && haveMeshHeader && (mh.HopsLeft > 0); if (forward) { mh.HopsLeft--; // currently we always need to reallocate a frame to be forwarded, since mac header space is worst case assumption Frame frame = Frame.GetFrame(_macHeader + Messages6LoWPAN.MeshHeader.cLengthMax + Messages6LoWPAN.BroadcastHeader.cLength, sdu.LengthDataUsed + _macTailer); frame.WriteToBack(sdu); bool ok = true; UInt16 nextHop; if (multicast) { nextHop = cBroadcastShortAddr; ok = haveBroadcastHeader && bh.WriteToFrameHeader(frame); } else { bool routeHasError; ok = _routingTable.GetRoute(targetAddr, out nextHop, out routeHasError); if (!ok || routeHasError) { SendRouteError(origAddr, targetAddr, !routeHasError); } } ok &= mh.WriteToFrameHeader(frame); if (ok) { MacDataRequest(nextHop, ref frame); } Frame.Release(ref frame); } if (consume) { if (dispatch == Messages6LoWPAN.Dispatch.NonLowPan) { Message.Type type; if (Message.GetType(sdu, out type)) { switch (type) { case Message.Type.Data: { Message.Data data = new Message.Data(); if (data.ReadFromFrameHeader(sdu)) { _data.HandleDataIndication(origAddr, targetAddr, ref sdu); } break; } case Message.Type.DiscoveryReply: { Message.DiscoveryReply drep; if (_isAddrServer && drep.ReadFromFrame(sdu)) { _addrServer.HandleDiscoveryReply(origAddr); } break; } } } } else { // must be 6LoWPAN frame _data.HandleDataIndication6Low(origAddr, targetAddr, ref sdu); } } Frame.Release(ref sdu); }