More accurate accounting of bond layer overhead traffic

node/Bond.cpp

@@ -717,6 +717,7 @@ void Bond::sendPATH_NEGOTIATION_REQUEST(void* tPtr, int pathIdx)
 	if (_paths[pathIdx].p->address()) {
 		outp.armor(_peer->key(), false, _peer->aesKeysIfSupported());
 		RR->node->putPacket(tPtr, _paths[pathIdx].p->localSocket(), _paths[pathIdx].p->address(), outp.data(), outp.size());
+		_overheadBytes += outp.size();
 	}
 }
 
@@ -726,7 +727,6 @@ void Bond::sendQOS_MEASUREMENT(void* tPtr, int pathIdx, int64_t localSocket, con
 	Packet outp(_peer->_id.address(), RR->identity.address(), Packet::VERB_QOS_MEASUREMENT);
 	char qosData[ZT_QOS_MAX_PACKET_SIZE];
 	int16_t len = generateQoSPacket(pathIdx, _now, qosData);
-	_overheadBytes += len;
 	if (len) {
 		outp.append(qosData, len);
 		if (atAddress) {
@@ -738,6 +738,7 @@ void Bond::sendQOS_MEASUREMENT(void* tPtr, int pathIdx, int64_t localSocket, con
 		}
 		_paths[pathIdx].packetsReceivedSinceLastQoS = 0;
 		_paths[pathIdx].lastQoSMeasurement = now;
+		_overheadBytes += outp.size();
 	}
 	// debug("send QOS via link %s (len=%d)", pathToStr(_paths[pathIdx].p).c_str(), len);
 }