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Unified Diff: src/internet/model/tcp-option-sack.cc

Issue 283880043: SACK implementation
Patch Set: Fixing to ensure the patch can be applied on ns-3.24 Created 7 years, 11 months ago
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Index: src/internet/model/tcp-option-sack.cc
===================================================================
new file mode 100644
--- /dev/null
+++ b/src/internet/model/tcp-option-sack.cc
@@ -0,0 +1,154 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2011 Adrian Sai-wah Tam
+ *
+ * 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
+ *
+ * Author: Adrian Sai-wah Tam <adrian.sw.tam@gmail.com>
+ *
+ * Documentation, test cases: Truc Anh N. Nguyen <annguyen@ittc.ku.edu>
+ * ResiliNets Research Group http://wiki.ittc.ku.edu/resilinets
+ * The University of Kansas
+ * James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
+ */
+
+#include "tcp-option-sack.h"
+#include "ns3/log.h"
+
+namespace ns3 {
+
+NS_LOG_COMPONENT_DEFINE ("TcpOptionSack");
+
+NS_OBJECT_ENSURE_REGISTERED (TcpOptionSack);
+
+TcpOptionSack::TcpOptionSack ()
+ : TcpOption ()
+{
+}
+
+TcpOptionSack::~TcpOptionSack ()
+{
+}
+
+TypeId
+TcpOptionSack::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::TcpOptionSack")
+ .SetParent<TcpOption> ()
+ .SetGroupName ("Internet")
+ .AddConstructor<TcpOptionSack> ()
+ ;
+ return tid;
+}
+
+TypeId
+TcpOptionSack::GetInstanceTypeId (void) const
+{
+ return GetTypeId ();
+}
+
+void
+TcpOptionSack::Print (std::ostream &os) const
+{
+}
+
+uint32_t
+TcpOptionSack::GetSerializedSize (void) const
+{
+ NS_LOG_FUNCTION (this);
+ NS_LOG_LOGIC ("Serialized size: " << 2 + GetNumSackBlocks () * 8);
+ return 2 + GetNumSackBlocks () * 8;
+}
+
+void
+TcpOptionSack::Serialize (Buffer::Iterator start) const
+{
+ NS_LOG_FUNCTION (this);
+ Buffer::Iterator i = start;
+ i.WriteU8 (GetKind ()); // Kind
+ uint8_t length = GetNumSackBlocks () * 8 + 2;
+ i.WriteU8 (length); // Length
+
+ for (SackList::const_iterator it = m_sackList.begin (); it != m_sackList.end (); ++it)
+ {
+ SequenceNumber32 leftEdge = it->first;
+ SequenceNumber32 rightEdge = it->second;
+ i.WriteHtonU32 (leftEdge.GetValue ()); // Left edge of the block
+ i.WriteHtonU32 (rightEdge.GetValue ()); // Right edge of the block
+ }
+}
+
+uint32_t
+TcpOptionSack::Deserialize (Buffer::Iterator start)
+{
+ NS_LOG_FUNCTION (this);
+ Buffer::Iterator i = start;
+ uint8_t readKind = i.ReadU8 ();
+ if (readKind != GetKind ())
+ {
+ NS_LOG_WARN ("Malformed SACK option, wrong type");
+ return 0;
+ }
+
+ uint8_t size = i.ReadU8 ();
+ NS_LOG_LOGIC ("Size: " << (uint32_t)size);
+ m_sackList.empty ();
+ uint8_t sackCount = (size - 2) / 8;
+ while (sackCount)
+ {
+ SequenceNumber32 leftEdge = SequenceNumber32 (i.ReadNtohU32 ());
+ SequenceNumber32 rightEdge = SequenceNumber32 (i.ReadNtohU32 ());
+ SackBlock s (leftEdge, rightEdge);
+ AddSackBlock (s);
+ sackCount--;
+ }
+
+ return GetSerializedSize ();
+}
+
+uint8_t
+TcpOptionSack::GetKind (void) const
+{
+ return TcpOption::SACK;
+}
+
+void
+TcpOptionSack::AddSackBlock (SackBlock s)
+{
+ NS_LOG_FUNCTION (this);
+ m_sackList.push_back (s);
+}
+
+uint32_t
+TcpOptionSack::GetNumSackBlocks (void) const
+{
+ NS_LOG_FUNCTION (this);
+ NS_LOG_LOGIC ("Number of SACK blocks appended: " << m_sackList.size ());
+ return m_sackList.size ();
+}
+
+void
+TcpOptionSack::ClearSackList (void)
+{
+ m_sackList.clear ();
+}
+
+SackList
+TcpOptionSack::GetSackList (void) const
+{
+ NS_LOG_FUNCTION (this);
+ return m_sackList;
+}
+
+} // namespace ns3
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