poprawka losowania wolnego portu, poprawka liczenia timeoutu dla SNAT (+15 zamiast sztywno 15)

NATRouter.cpp

@@ -45,8 +45,14 @@ int NATRouter::getFreePort()
 	if (this->lastUsedPort == NAT_TABLE_LEN-1)
 		this->lastUsedPort = 0;
 
-	if (this->natTable[this->lastUsedPort+1].isFree())
+	//if (this->natTable[this->lastUsedPort+1].isFree())
-		return ++this->lastUsedPort;
+	//	return ++this->lastUsedPort;
+	for (int i = this->lastUsedPort+1; i<NAT_TABLE_LEN; ++i)
+			if (this->natTable[i].isFree())
+			{
+				this->lastUsedPort = i;
+				return i;
+			}
 
 	for (int i = 1; i<this->lastUsedPort; ++i)
 		if (this->natTable[i].isFree())
@@ -148,9 +154,11 @@ void NATRouter::sNAT(Packet *packet)
 {
 	int port;
 	NATItem *natItem;
+	bool allocated = false;
+	stringstream ss;
 
 	// mozliwe, ze juz port zostal zaalokowany, to trzeba wykorzystac
-	// TODO getAllocatedPort - STRASZNIE zmula caly symulator
+	// TO
 	port = this->getAllocatedPort(packet->getSrcIp(), packet->getSrcPort());
 	if (port == -1)
 		while ((port = this->getFreePort()) == -1)
@@ -159,14 +167,25 @@ void NATRouter::sNAT(Packet *packet)
 			this->print("NAT table full, waiting 1s", true);
 			this->delay(1);
 		}
+	else
+		allocated = true;
 
 	// wstawiam do tablicy NAT info ze port zarezerowany na odbior
 	natItem = &this->natTable[port];
 	natItem->setIp(packet->getSrcIp());
 	natItem->setPort(packet->getSrcPort());
+
+	if (allocated)
+		natItem->increaseTimeout(15);
+	else
 		natItem->setTimeout(15);
 
-	stringstream ss;
+	ss << packet->getSrcIp() << ":" << packet->getSrcPort();
+
+	if (!allocated)
+		this->natHelper.insert(pair<string, int>(ss.str(), port));
+
+	ss.str("");
 	ss << "SNAT " << packet->getSrcIp() << ":" << packet->getSrcPort() << " --> " << this->getWanIp() << ":" << port;
 
 	packet->setSrcIp(this->getWanIp());	// zamieniam IP lokalne na WAN'owe
@@ -219,11 +238,26 @@ string NATRouter::getWanNetwork()
  */
 int NATRouter::getAllocatedPort(string srcIp, int srcPort)
 {
-	for (int i=1; i<NAT_TABLE_LEN; ++i)
+	map<string, int>::iterator it;
+	int pos = -1;
+	/*for (int i=1; i<NAT_TABLE_LEN; ++i)
 		if (this->natTable[i].getIp() == srcIp && this->natTable[i].getPort() == srcPort)
 			return i;
+*/
+	stringstream ss;
+	ss << srcIp << ":" << srcPort;
 
-	return -1;	// nic nie znaleziono
+	it = this->natHelper.find(ss.str());
+	if (it != this->natHelper.end())
+	{
+		// sprawdz czy wpis o podanym IP z nat nie zostal napisany (referencja nieaktualna)
+		if (this->natTable[it->second].getIp() != srcIp || this->natTable[it->second].getPort() != srcPort)
+			this->natHelper.erase(it);
+		else
+			pos = it->second;
+	}
+
+	return pos;
 }
 
 void NATRouter::freePorts()

NATRouter.h

@@ -15,6 +15,7 @@
 class NATRouter : public Node
 {
 	NATItem *natTable = NULL;	// tablica z zaalokowanymi portami na zewnątrz
+	map<string, int> natHelper;	// mapa pomocnicza pozwalajaca szybko znalezc wpis
 	NetConf netWanConf;			// konfiguracja sieciowa na zewnątrz
 	void initalizeNatTable();
 	int getFreePort();

Simulation.cpp

@@ -324,8 +324,8 @@ void Simulation::natOverflowSimulation(int nNodes)
 		if (currentSrcPort[i] == 65535)
 			currentSrcPort[i] = 1;
 
-		p.setSrcPort(currentSrcPort[i]++);
+		//p.setSrcPort(currentSrcPort[i]++);
-
+		//p.setSrcPort(0);
 		client[i].send(p);
 
 		this->delay(150);