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Unified Diff: src/internet/test/tcp-ecn-test.cc

Issue 328370043: Patch for DualQCoupledPiSquareQueueDisc
Patch Set: Created 6 years, 7 months ago
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Index: src/internet/test/tcp-ecn-test.cc
===================================================================
new file mode 100644
--- /dev/null
+++ b/src/internet/test/tcp-ecn-test.cc
@@ -0,0 +1,567 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2016 NITK Surathkal
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Authors: Shravya Ks <shravya.ks0@gmail.com>
+ *
+ */
+#include "ns3/ipv4.h"
+#include "ns3/ipv6.h"
+#include "ns3/ipv4-interface-address.h"
+#include "ns3/ipv4-route.h"
+#include "ns3/ipv6-route.h"
+#include "ns3/ipv4-routing-protocol.h"
+#include "ns3/ipv6-routing-protocol.h"
+#include "../model/ipv4-end-point.h"
+#include "../model/ipv6-end-point.h"
+#include "tcp-general-test.h"
+#include "ns3/node.h"
+#include "ns3/log.h"
+#include "tcp-error-model.h"
+#include "ns3/tcp-l4-protocol.h"
+
+namespace ns3 {
+
+NS_LOG_COMPONENT_DEFINE ("TcpECNTestSuite");
+/**
+ * \ingroup internet-test
+ * \ingroup tests
+ *
+ * \brief checks if ECT, CWR and ECE bits are set correctly in different scenarios
+ *
+ * This test suite will run four combinations of enabling ECN (sender off and receiver off; sender on and sender off;
+ * sender off and receiver on; sender on and receiver on;) and checks that the TOS byte of eventual packets transmitted
+ * or received have ECT, CWR, and ECE set correctly (or not). It also checks if congestion window is being reduced by half
+ * only once per every window on receipt of ECE flags
+ *
+ */
+class TcpECNTest : public TcpGeneralTest
+{
+public:
+ /**
+ * \brief Constructor
+ *
+ * \param testcase test case number
+ * \param desc Description about the ECN capabilities of sender and reciever
+ */
+ TcpECNTest (uint32_t testcase, const std::string &desc);
+
+protected:
+ virtual void CWndTrace (uint32_t oldValue, uint32_t newValue);
+ virtual void Rx (const Ptr<const Packet> p, const TcpHeader&h, SocketWho who);
+ virtual void Tx (const Ptr<const Packet> p, const TcpHeader&h, SocketWho who);
+ virtual Ptr<TcpSocketMsgBase> CreateSenderSocket (Ptr<Node> node);
+ void ConfigureProperties ();
+
+private:
+ uint32_t m_cwndChangeCount;
+ uint32_t m_senderSent;
+ uint32_t m_receiverSent;
+ uint32_t m_senderReceived;
+ uint32_t m_receiverReceived;
+ uint32_t m_testcase;
+};
+
+
+/**
+ * \ingroup internet-test
+ * \ingroup tests
+ *
+ * \brief A TCP socket which sends certain data packets with CE flags set for tests 5 and 6.
+ *
+ * The SendDataPacket function of this class sends data packets numbered 1 and 2 with CE flags set
+ * for test 5 to verify if ECE and CWR bits are correctly set by receiver and sender respectively. It
+ * also sets CE flags on data packets 10 and 11 in test case 6 to check if sender reduces congestion window
+ * by half and also only once per every window.
+ *
+ */
+class TcpSocketCongestedRouter : public TcpSocketMsgBase
+{
+public:
+ /**
+ * \brief Get the type ID.
+ * \return the object TypeId
+ */
+ static TypeId GetTypeId (void);
+
+ uint32_t m_dataPacketSent;
+ uint8_t m_testcase;
+
+ TcpSocketCongestedRouter ()
+ : TcpSocketMsgBase ()
+ {
+ m_dataPacketSent = 0;
+ }
+
+ /**
+ * \brief Constructor.
+ * \param other The object to copy from.
+ */
+ TcpSocketCongestedRouter (const TcpSocketCongestedRouter &other)
+ : TcpSocketMsgBase (other)
+ {
+ }
+
+ void SetTestCase (uint8_t testCase);
+
+protected:
+ virtual uint32_t SendDataPacket (SequenceNumber32 seq, uint32_t maxSize, bool withAck);
+ virtual void ReTxTimeout ();
+ Ptr<TcpSocketBase> Fork (void);
+};
+
+NS_OBJECT_ENSURE_REGISTERED (TcpSocketCongestedRouter);
+
+TypeId
+TcpSocketCongestedRouter::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::TcpSocketCongestedRouter")
+ .SetParent<TcpSocketMsgBase> ()
+ .SetGroupName ("Internet")
+ .AddConstructor<TcpSocketCongestedRouter> ()
+ ;
+ return tid;
+}
+
+void
+TcpSocketCongestedRouter::ReTxTimeout ()
+{
+ TcpSocketBase::ReTxTimeout ();
+}
+
+void
+TcpSocketCongestedRouter::SetTestCase (uint8_t testCase)
+{
+ m_testcase = testCase;
+}
+
+uint32_t
+TcpSocketCongestedRouter::SendDataPacket (SequenceNumber32 seq, uint32_t maxSize, bool withAck)
+{
+ NS_LOG_FUNCTION (this << seq << maxSize << withAck);
+ m_dataPacketSent++;
+
+ bool isRetransmission = false;
+ if (seq != m_tcb->m_highTxMark)
+ {
+ isRetransmission = true;
+ }
+
+ Ptr<Packet> p = m_txBuffer->CopyFromSequence (maxSize, seq);
+ uint32_t sz = p->GetSize (); // Size of packet
+ uint8_t flags = withAck ? TcpHeader::ACK : 0;
+ uint32_t remainingData = m_txBuffer->SizeFromSequence (seq + SequenceNumber32 (sz));
+
+ if (withAck)
+ {
+ m_delAckEvent.Cancel ();
+ m_delAckCount = 0;
+ }
+
+ // Sender should reduce the Congestion Window as a response to receiver's ECN Echo notification only once per window
+ if (m_tcb->m_ecnState == TcpSocketState::ECN_ECE_RCVD && m_ecnEchoSeq.Get () > m_ecnCWRSeq.Get () && !isRetransmission )
+ {
+ NS_LOG_INFO ("Backoff mechanism by reducing CWND by half because we've received ECN Echo");
+ m_tcb->m_ssThresh = m_congestionControl->GetSsThresh (m_tcb, BytesInFlight ());
+ //m_tcb->m_cWnd = std::max ((uint32_t)m_tcb->m_cWnd / 2, m_tcb->m_segmentSize);
+ m_congestionControl->ReduceCwnd (m_tcb);
+ flags |= TcpHeader::CWR;
+ m_ecnCWRSeq = seq;
+ m_tcb->m_ecnState = TcpSocketState::ECN_CWR_SENT;
+ NS_LOG_DEBUG (TcpSocketState::EcnStateName[m_tcb->m_ecnState] << " -> ECN_CWR_SENT");
+ NS_LOG_INFO ("CWR flags set");
+ NS_LOG_DEBUG (TcpSocketState::TcpCongStateName[m_tcb->m_congState] << " -> CA_CWR");
+ if (m_tcb->m_congState == TcpSocketState::CA_OPEN)
+ {
+ m_congestionControl->CongestionStateSet (m_tcb, TcpSocketState::CA_CWR);
+ m_tcb->m_congState = TcpSocketState::CA_CWR;
+ }
+ }
+ /*
+ * Add tags for each socket option.
+ * Note that currently the socket adds both IPv4 tag and IPv6 tag
+ * if both options are set. Once the packet got to layer three, only
+ * the corresponding tags will be read.
+ */
+ if (GetIpTos ())
+ {
+ SocketIpTosTag ipTosTag;
+
+ NS_LOG_LOGIC (" ECT bits should not be set on retransmitted packets ");
+ if ( m_testcase == 5 && (m_dataPacketSent == 1 || m_dataPacketSent == 2) && !isRetransmission )
+ {
+ ipTosTag.SetTos (GetIpTos () | 0x3);
+ }
+ else if ( m_testcase == 6 && ( m_dataPacketSent == 10 || m_dataPacketSent == 11 ) && !isRetransmission )
+ {
+ ipTosTag.SetTos (GetIpTos () | 0x3);
+ }
+ else
+ {
+ if (m_tcb->m_ecnState != TcpSocketState::ECN_DISABLED && (GetIpTos () & 0x3) == 0 && !isRetransmission)
+ {
+ ipTosTag.SetTos (GetIpTos () | 0x2);
+ }
+ else
+ {
+ ipTosTag.SetTos (GetIpTos ());
+ }
+ }
+ p->AddPacketTag (ipTosTag);
+ }
+ else
+ {
+ SocketIpTosTag ipTosTag;
+ if ( m_testcase == 5 && (m_dataPacketSent == 1 || m_dataPacketSent == 2) && !isRetransmission)
+ {
+ ipTosTag.SetTos (0x3);
+ }
+ else if ( m_testcase == 6 && ( m_dataPacketSent == 10 || m_dataPacketSent == 11 ) && !isRetransmission )
+ {
+ ipTosTag.SetTos (0x3);
+ }
+ else
+ {
+ if (m_tcb->m_ecnState != TcpSocketState::ECN_DISABLED && !isRetransmission)
+ {
+ ipTosTag.SetTos (0x2);
+ }
+ }
+ p->AddPacketTag (ipTosTag);
+ }
+
+ if (IsManualIpv6Tclass ())
+ {
+ SocketIpv6TclassTag ipTclassTag;
+ if ( m_testcase == 5 && (m_dataPacketSent == 1 || m_dataPacketSent == 2) && !isRetransmission )
+ {
+ ipTclassTag.SetTclass (GetIpv6Tclass () | 0x3);
+ }
+ else if ( m_testcase == 6 && ( m_dataPacketSent == 10 || m_dataPacketSent == 11 ) && !isRetransmission)
+ {
+ ipTclassTag.SetTclass (GetIpv6Tclass () | 0x3);
+ }
+ else
+ {
+ if (m_tcb->m_ecnState != TcpSocketState::ECN_DISABLED && (GetIpv6Tclass () & 0x3) == 0 && !isRetransmission)
+ {
+ ipTclassTag.SetTclass (GetIpv6Tclass () | 0x2);
+ }
+ else
+ {
+ ipTclassTag.SetTclass (GetIpv6Tclass ());
+ }
+ }
+ p->AddPacketTag (ipTclassTag);
+ }
+ else
+ {
+ SocketIpv6TclassTag ipTclassTag;
+ if ( m_testcase == 5 && (m_dataPacketSent == 1 || m_dataPacketSent == 2) && !isRetransmission)
+ {
+ ipTclassTag.SetTclass (0x3);
+ }
+ else if ( m_testcase == 6 &&( m_dataPacketSent == 10 || m_dataPacketSent == 11 ) && !isRetransmission)
+ {
+ ipTclassTag.SetTclass (0x3);
+ }
+ else
+ {
+ if (m_tcb->m_ecnState != TcpSocketState::ECN_DISABLED && !isRetransmission)
+ {
+ ipTclassTag.SetTclass (0x2);
+ }
+ }
+ p->AddPacketTag (ipTclassTag);
+ }
+
+ if (IsManualIpTtl ())
+ {
+ SocketIpTtlTag ipTtlTag;
+ ipTtlTag.SetTtl (GetIpTtl ());
+ p->AddPacketTag (ipTtlTag);
+ }
+
+ if (IsManualIpv6HopLimit ())
+ {
+ SocketIpv6HopLimitTag ipHopLimitTag;
+ ipHopLimitTag.SetHopLimit (GetIpv6HopLimit ());
+ p->AddPacketTag (ipHopLimitTag);
+ }
+
+ uint8_t priority = GetPriority ();
+ if (priority)
+ {
+ SocketPriorityTag priorityTag;
+ priorityTag.SetPriority (priority);
+ p->ReplacePacketTag (priorityTag);
+ }
+
+ if (m_closeOnEmpty && (remainingData == 0))
+ {
+ flags |= TcpHeader::FIN;
+ if (m_state == ESTABLISHED)
+ { // On active close: I am the first one to send FIN
+ NS_LOG_DEBUG ("ESTABLISHED -> FIN_WAIT_1");
+ m_state = FIN_WAIT_1;
+ }
+ else if (m_state == CLOSE_WAIT)
+ { // On passive close: Peer sent me FIN already
+ NS_LOG_DEBUG ("CLOSE_WAIT -> LAST_ACK");
+ m_state = LAST_ACK;
+ }
+ }
+ TcpHeader header;
+ header.SetFlags (flags);
+ header.SetSequenceNumber (seq);
+ header.SetAckNumber (m_rxBuffer->NextRxSequence ());
+ if (m_endPoint)
+ {
+ header.SetSourcePort (m_endPoint->GetLocalPort ());
+ header.SetDestinationPort (m_endPoint->GetPeerPort ());
+ }
+ else
+ {
+ header.SetSourcePort (m_endPoint6->GetLocalPort ());
+ header.SetDestinationPort (m_endPoint6->GetPeerPort ());
+ }
+ header.SetWindowSize (AdvertisedWindowSize ());
+ AddOptions (header);
+
+ if (m_retxEvent.IsExpired ())
+ {
+ // Schedules retransmit timeout. m_rto should be already doubled.
+
+ NS_LOG_LOGIC (this << " SendDataPacket Schedule ReTxTimeout at time " <<
+ Simulator::Now ().GetSeconds () << " to expire at time " <<
+ (Simulator::Now () + m_rto.Get ()).GetSeconds () );
+ m_retxEvent = Simulator::Schedule (m_rto, &TcpSocketCongestedRouter::ReTxTimeout, this);
+ }
+
+ m_txTrace (p, header, this);
+
+ if (m_endPoint)
+ {
+ m_tcp->SendPacket (p, header, m_endPoint->GetLocalAddress (),
+ m_endPoint->GetPeerAddress (), m_boundnetdevice);
+ NS_LOG_DEBUG ("Send segment of size " << sz << " with remaining data " <<
+ remainingData << " via TcpL4Protocol to " << m_endPoint->GetPeerAddress () <<
+ ". Header " << header);
+ }
+ else
+ {
+ m_tcp->SendPacket (p, header, m_endPoint6->GetLocalAddress (),
+ m_endPoint6->GetPeerAddress (), m_boundnetdevice);
+ NS_LOG_DEBUG ("Send segment of size " << sz << " with remaining data " <<
+ remainingData << " via TcpL4Protocol to " << m_endPoint6->GetPeerAddress () <<
+ ". Header " << header);
+ }
+
+ UpdateRttHistory (seq, sz, isRetransmission);
+
+ // Notify the application of the data being sent unless this is a retransmit
+ if (seq + sz > m_tcb->m_highTxMark)
+ {
+ Simulator::ScheduleNow (&TcpSocketCongestedRouter::NotifyDataSent, this,
+ (seq + sz - m_tcb->m_highTxMark.Get ()));
+ }
+ // Update highTxMark
+ m_tcb->m_highTxMark = std::max (seq + sz, m_tcb->m_highTxMark.Get ());
+ return sz;
+}
+
+Ptr<TcpSocketBase>
+TcpSocketCongestedRouter::Fork (void)
+{
+ return CopyObject<TcpSocketCongestedRouter> (this);
+}
+
+
+TcpECNTest::TcpECNTest (uint32_t testcase, const std::string &desc)
+ : TcpGeneralTest (desc),
+ m_cwndChangeCount (0),
+ m_senderSent (0),
+ m_receiverSent (0),
+ m_senderReceived (0),
+ m_receiverReceived (0),
+ m_testcase (testcase)
+{
+}
+
+void
+TcpECNTest::ConfigureProperties ()
+{
+ TcpGeneralTest::ConfigureProperties ();
+ if (m_testcase == 2 || m_testcase == 4 || m_testcase == 5 || m_testcase == 6)
+ {
+ SetEcn (SENDER);
+ }
+ if (m_testcase == 3 || m_testcase == 4 ||m_testcase == 5 || m_testcase == 6)
+ {
+ SetEcn (RECEIVER);
+ }
+}
+
+void
+TcpECNTest::CWndTrace (uint32_t oldValue, uint32_t newValue)
+{
+ if (m_testcase == 6)
+ {
+ uint32_t increase = newValue - oldValue;
+ if ( increase < 0)
+ {
+ m_cwndChangeCount++;
+ NS_TEST_ASSERT_MSG_EQ (m_cwndChangeCount, 1, "Congestion window should be reduced once per every window");
+ NS_TEST_ASSERT_MSG_EQ (newValue, oldValue / 2, "Congestion window should be reduced by half");
+ }
+ }
+}
+
+void
+TcpECNTest::Rx (const Ptr<const Packet> p, const TcpHeader &h, SocketWho who)
+{
+ if (who == RECEIVER)
+ {
+ if (m_receiverReceived == 0)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::SYN), 0, "SYN should be received as first message at the receiver");
+ if (m_testcase == 2 || m_testcase == 4 || m_testcase == 5 ||m_testcase == 6)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::ECE) && ((h.GetFlags ()) & TcpHeader::CWR), 0, "The flags ECE + CWR should be set in the TCP header of first message receieved at receiver when sender is ECN Capable");
+ }
+ else
+ {
+ NS_TEST_ASSERT_MSG_EQ (((h.GetFlags ()) & TcpHeader::ECE) && ((h.GetFlags ()) & TcpHeader::CWR), 0, "The flags ECE + CWR should not be set in the TCP header of first message receieved at receiver when sender is not ECN Capable");
+ }
+ }
+ else if (m_receiverReceived == 1)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::ACK), 0, "ACK should be received as second message at receiver");
+ }
+ else if (m_receiverReceived == 3 && m_testcase == 5)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::CWR), 0, "Sender should send CWR on receipt of ECE");
+ }
+ m_receiverReceived++;
+ }
+ else if (who == SENDER)
+ {
+ if (m_senderReceived == 0)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::SYN) && ((h.GetFlags ()) & TcpHeader::ACK), 0, "SYN+ACK received as first message at sender");
+ if (m_testcase == 4 || m_testcase == 5 || m_testcase == 6)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::ECE), 0, "The flag ECE should be set in the TCP header of first message receieved at sender when both receiver and sender are ECN Capable");
+ }
+ else
+ {
+ NS_TEST_ASSERT_MSG_EQ (((h.GetFlags ()) & TcpHeader::ECE), 0, "The flag ECE should not be set in the TCP header of first message receieved at sender when either receiver or sender are not ECN Capable");
+ }
+ }
+ if (m_senderReceived == 3 && m_testcase == 5)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::ECE), 0, "The flag ECE should be set in TCP header of the packet sent by the receiver when it receives a packet with CE bit set in IP header");
+ }
+ if (m_senderReceived == 4 && m_testcase == 5)
+ {
+ NS_TEST_ASSERT_MSG_NE (((h.GetFlags ()) & TcpHeader::ECE), 0, "The flag ECE should be set in TCP header of the packet sent by the receiver even after sender sends CWR flags to receiver if it receives a packet with CE bit set in IP header");
+ }
+ if ( m_testcase == 5 && m_receiverReceived > 12)
+ {
+ NS_TEST_ASSERT_MSG_EQ (((h.GetFlags ()) & TcpHeader::ECE), 0, "The flag ECE should not be set in TCP header of the packet sent by the receiver after sender sends CWR flags to receiver and receiver receives a packet without CE bit set in IP header");
+ }
+ m_senderReceived++;
+ }
+}
+
+void
+TcpECNTest::Tx (const Ptr<const Packet> p, const TcpHeader &h, SocketWho who)
+{
+ if (who == SENDER)
+ {
+ m_senderSent++;
+ if (m_senderSent == 3)
+ {
+ SocketIpTosTag ipTosTag;
+ p->PeekPacketTag (ipTosTag);
+ if (m_testcase == 4 || m_testcase == 6)
+ {
+ NS_TEST_ASSERT_MSG_EQ ((ipTosTag.GetTos ()), 0x2, "IP TOS should have ECT set if ECN negotiation between endpoints is successful");
+ }
+ else if (m_testcase == 5)
+ {
+ if (m_senderSent == 3 || m_senderSent == 4)
+ {
+ NS_TEST_ASSERT_MSG_EQ ((ipTosTag.GetTos ()), 0x3, "IP TOS should have CE bit set for 3rd and 4th packet sent in test case 5");
+ }
+ else
+ {
+ NS_TEST_ASSERT_MSG_EQ ((ipTosTag.GetTos ()), 0x2, "IP TOS should have ECT set if ECN negotiation between endpoints is successful");
+ }
+ }
+ else
+ {
+ NS_TEST_ASSERT_MSG_NE ((ipTosTag.GetTos ()), 0x2, "IP TOS should not have ECT set if ECN negotiation between endpoints is unsuccessful");
+ }
+ }
+ }
+}
+
+Ptr<TcpSocketMsgBase>
+TcpECNTest::CreateSenderSocket (Ptr<Node> node)
+{
+ if (m_testcase == 5 || m_testcase == 6)
+ {
+ Ptr<TcpSocketCongestedRouter> socket = DynamicCast<TcpSocketCongestedRouter> (
+ CreateSocket (node,
+ TcpSocketCongestedRouter::GetTypeId (),
+ m_congControlTypeId));
+ socket->SetTestCase (m_testcase);
+ return socket;
+ }
+ else
+ {
+ return TcpGeneralTest::CreateSenderSocket (node);
+ }
+}
+
+/**
+ * \ingroup internet-test
+ * \ingroup tests
+ *
+ * \brief TCP ECN TestSuite
+ */
+static class TcpECNTestSuite : public TestSuite
+{
+public:
+ TcpECNTestSuite () : TestSuite ("tcp-ecn-test", UNIT)
+ {
+ AddTestCase (new TcpECNTest (1, "ECN Negotiation Test : ECN incapable sender and ECN incapable receiver"),
+ TestCase::QUICK);
+ AddTestCase (new TcpECNTest (2, "ECN Negotiation Test : ECN capable sender and ECN incapable receiver"),
+ TestCase::QUICK);
+ AddTestCase (new TcpECNTest (3, "ECN Negotiation Test : ECN incapable sender and ECN capable receiver"),
+ TestCase::QUICK);
+ AddTestCase (new TcpECNTest (4, "ECN Negotiation Test : ECN capable sender and ECN capable receiver"),
+ TestCase::QUICK);
+ AddTestCase (new TcpECNTest (5, "ECE and CWR Functionality Test: ECN capable sender and ECN capable receiver"),
+ TestCase::QUICK);
+ AddTestCase (new TcpECNTest (6, "Congestion Window Reduction Test :ECN capable sender and ECN capable receiver"),
+ TestCase::QUICK);
+ }
+} g_tcpECNTestSuite;
+
+} // namespace ns3
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