157 lines
4.1 KiB
C++
157 lines
4.1 KiB
C++
/*
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* Copyright (c) 2017, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef TINS_TCP_IP_ACK_TRACKER_H
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#define TINS_TCP_IP_ACK_TRACKER_H
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#include <tins/config.h>
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#ifdef TINS_HAVE_ACK_TRACKER
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#include <vector>
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#include <boost/icl/interval_set.hpp>
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#include <tins/macros.h>
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namespace Tins {
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class PDU;
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namespace TCPIP {
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/**
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* \brief Represents an acknowledged segment range
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*
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* The interval represented by this range is a closed interval [first, last].
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*/
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class TINS_API AckedRange {
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public:
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typedef boost::icl::discrete_interval<uint32_t> interval_type;
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/**
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* \brief Constructs an acked range
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*
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* \param first The first acked byte
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* \param last The last acked byte (inclusive)
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*/
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AckedRange(uint32_t first, uint32_t last);
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/**
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* \brief Gets the next acked interval in this range
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*
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* If has_next() == false, then this returns an empty interval
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*/
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interval_type next();
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/**
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* Indicates whether there is still some non-consumed acked-interval in this
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* range
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*/
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bool has_next() const;
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/**
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* Gets the first index acked by this range
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*/
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uint32_t first() const;
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/**
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* Gets the last index acked by this range
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*/
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uint32_t last() const;
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private:
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uint32_t first_;
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uint32_t last_;
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};
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/**
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* \brief Allows tracking acknowledged intervals in a TCP stream
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*/
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class TINS_API AckTracker {
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public:
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/**
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* The type used to store ACKed intervals
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*/
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typedef boost::icl::interval_set<uint32_t> interval_set_type;
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/**
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* Default constructor
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*/
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AckTracker();
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/**
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* \brief Construct an instance using some attributes
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*
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* \param intial_ack The initial ACK number to use
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* \param use_sack Indicate whether to use Selective ACKs to track ACK numbers
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*/
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AckTracker(uint32_t initial_ack, bool use_sack = true);
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/**
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* \brief Process a packet
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*/
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void process_packet(const PDU& packet);
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/**
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* \brief Indicates whether Selective ACKs should be processed
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*/
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void use_sack();
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/**
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* Retrieves the current ACK number in this tracker
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*/
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uint32_t ack_number() const;
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/**
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* \brief Retrieves all acked intervals by Selective ACKs
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*/
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const interval_set_type& acked_intervals() const;
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/**
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* \brief Indicates whether the given segment has been already ACKed
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*
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* \param sequence_number The segment's sequence number
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* \param length The segment's length
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*/
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bool is_segment_acked(uint32_t sequence_number, uint32_t length) const;
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private:
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void process_sack(const std::vector<uint32_t>& sack);
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void cleanup_sacked_intervals(uint32_t old_ack, uint32_t new_ack);
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interval_set_type acked_intervals_;
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uint32_t ack_number_;
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bool use_sack_;
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};
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} // TCPIP
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} // Tins
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#endif // TINS_HAVE_ACK_TRACKER
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#endif // TINS_TCP_IP_ACK_TRACKER_H
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