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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ | |
2 /* | |
3 * Copyright (c) 2011 Adrian Sai-wah Tam | |
4 * | |
5 * This program is free software; you can redistribute it and/or modify | |
6 * it under the terms of the GNU General Public License version 2 as | |
7 * published by the Free Software Foundation; | |
8 * | |
9 * This program is distributed in the hope that it will be useful, | |
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 * GNU General Public License for more details. | |
13 * | |
14 * You should have received a copy of the GNU General Public License | |
15 * along with this program; if not, write to the Free Software | |
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 * | |
18 * Author: Adrian Sai-wah Tam <adrian.sw.tam@gmail.com> | |
19 * | |
20 * Documentation, test cases: Truc Anh N. Nguyen <annguyen@ittc.ku.edu> | |
21 * ResiliNets Research Group http://wiki.ittc.ku.ed u/resilinets | |
22 * The University of Kansas | |
23 * James P.G. Sterbenz <jpgs@ittc.ku.edu>, director | |
24 */ | |
25 | |
26 #ifndef TCP_OPTION_SACK_H | |
27 #define TCP_OPTION_SACK_H | |
28 | |
29 #include "ns3/tcp-option.h" | |
30 #include "ns3/sequence-number.h" | |
31 | |
32 namespace ns3 { | |
33 | |
34 /** | |
35 * \brief Defines the TCP option of kind 5 (selective acknowledgment option) as in \RFC{2018} | |
36 * | |
37 * TCP SACK Option is used by a receiver to report non-contiguous blocks of data that have | |
38 * been received and queued in the receiving buffer. Using the information conv eyed in SACK option, | |
39 * a sender retransmits only the segments that have actually been lost, allowing the recovery of | |
40 * multiple packet losses per sending window. | |
41 * | |
42 * Each SACK block is defined by two 32-bit unsigned integers specifying the lef t and the right | |
43 * edge of the block. It means that with the 40-byte TCP option limitation in a ddition to the | |
44 * presence of TCP Timestamp Option, the maximum number of SACK blocks that can be appended | |
45 * to each segment is 3. | |
46 */ | |
47 | |
48 typedef std::pair<SequenceNumber32, SequenceNumber32> SackBlock; | |
49 typedef std::list<SackBlock> SackList; | |
50 | |
51 class TcpOptionSack : public TcpOption | |
52 { | |
53 public: | |
54 /** | |
55 * \brief Get the type ID. | |
56 * \return the object TypeId | |
57 */ | |
58 static TypeId GetTypeId (void); | |
59 virtual TypeId GetInstanceTypeId (void) const; | |
60 | |
61 TcpOptionSack (); | |
62 virtual ~TcpOptionSack (); | |
63 | |
64 virtual void Print (std::ostream &os) const; | |
65 virtual void Serialize (Buffer::Iterator start) const; | |
66 virtual uint32_t Deserialize (Buffer::Iterator start); | |
67 | |
68 virtual uint8_t GetKind (void) const; | |
69 virtual uint32_t GetSerializedSize (void) const; | |
70 | |
71 /** | |
72 * \brief Add a SACK block | |
73 * \param s the SACK block to be added | |
74 */ | |
75 void AddSackBlock (SackBlock s); | |
76 | |
77 /** | |
78 * \brief Count the total number of SACK blocks | |
79 * \return the total number of SACK blocks | |
80 */ | |
81 uint32_t CountSackBlock (void) const; | |
Tom Henderson
2015/12/22 04:18:01
a minor naming suggestion: GetNumSackBlocks() wou
trucanh524
2015/12/28 23:32:54
Done.
| |
82 | |
83 /** | |
84 * \brief Clear the SACK list | |
85 */ | |
86 void ClearSackList (void); | |
87 | |
88 /** | |
89 * \brief Get the SACK list | |
90 * \return the SACK list | |
91 */ | |
92 SackList GetSackList (void) const; | |
93 | |
94 protected: | |
95 SackList m_sackList; //!< the list of SACK blocks | |
96 }; | |
97 | |
98 } // namespace ns3 | |
99 | |
100 #endif /* TCP_OPTION_SACK */ | |
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