Add flags to EXT_FRAME for better future proofness.

node/Packet.hpp

@@ -178,13 +178,15 @@
 
 #define ZT_PROTO_VERB_EXT_FRAME_IDX_NETWORK_ID (ZT_PACKET_IDX_PAYLOAD)
 #define ZT_PROTO_VERB_EXT_FRAME_LEN_NETWORK_ID 8
-#define ZT_PROTO_VERB_EXT_FRAME_IDX_TO (ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID + ZT_PROTO_VERB_EXT_FRAME_LEN_NETWORK_ID)
+#define ZT_PROTO_VERB_EXT_FRAME_IDX_FLAGS (ZT_PROTO_VERB_EXT_FRAME_IDX_NETWORK_ID + ZT_PROTO_VERB_EXT_FRAME_LEN_NETWORK_ID)
+#define ZT_PROTO_VERB_EXT_FRAME_LEN_FLAGS 1
+#define ZT_PROTO_VERB_EXT_FRAME_IDX_TO (ZT_PROTO_VERB_EXT_FRAME_IDX_FLAGS + ZT_PROTO_VERB_EXT_FRAME_LEN_FLAGS)
 #define ZT_PROTO_VERB_EXT_FRAME_LEN_TO 6
 #define ZT_PROTO_VERB_EXT_FRAME_IDX_FROM (ZT_PROTO_VERB_EXT_FRAME_IDX_TO + ZT_PROTO_VERB_EXT_FRAME_LEN_TO)
 #define ZT_PROTO_VERB_EXT_FRAME_LEN_FROM 6
 #define ZT_PROTO_VERB_EXT_FRAME_IDX_ETHERTYPE (ZT_PROTO_VERB_EXT_FRAME_IDX_FROM + ZT_PROTO_VERB_EXT_FRAME_LEN_FROM)
 #define ZT_PROTO_VERB_EXT_FRAME_LEN_ETHERTYPE 2
-#define ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD (ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE + 2)
+#define ZT_PROTO_VERB_EXT_FRAME_IDX_PAYLOAD (ZT_PROTO_VERB_FRAME_IDX_ETHERTYPE + ZT_PROTO_VERB_EXT_FRAME_LEN_ETHERTYPE)
 
 #define ZT_PROTO_VERB_MULTICAST_FRAME_IDX_PROPAGATION_DEPTH (ZT_PACKET_IDX_PAYLOAD)
 #define ZT_PROTO_VERB_MULTICAST_FRAME_LEN_PROPAGATION_DEPTH 2
@@ -510,6 +512,7 @@ public:
 		/*
 		 * An ethernet frame to or from specified MAC addresses:
 		 *   <[8] 64-bit network ID>
+		 *   <[1] flags (currently unused, must be 0)>
 		 *   <[6] destination MAC or all zero for destination node>
 		 *   <[6] source MAC or all zero for node of origin>
 		 *   <[2] 16-bit ethertype>

node/PacketDecoder.cpp

@@ -486,7 +486,7 @@ bool PacketDecoder::_doEXT_FRAME(const RuntimeEnvironment *_r,const SharedPtr<Pe
 				}
 
 				_incomingFrame(_r,peer,network,from,to,etherType,data() + ZT_PROTO_VERB_FRAME_IDX_PAYLOAD,size() - ZT_PROTO_VERB_FRAME_IDX_PAYLOAD);
-			} else return true; // ignore empty frames
+			}
 		} else {
 			TRACE("dropped EXT_FRAME from %s(%s): we are not connected to network %.16llx",source().toString().c_str(),_remoteAddress.toString().c_str(),at<uint64_t>(ZT_PROTO_VERB_FRAME_IDX_NETWORK_ID));
 		}