172 lines
4.4 KiB
C++
172 lines
4.4 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_MPLS_H
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#define TINS_MPLS_H
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#include <tins/pdu.h>
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#include <tins/endianness.h>
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#include <tins/macros.h>
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#include <tins/small_uint.h>
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namespace Tins {
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class ICMPExtension;
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/**
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* \class MPLS
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* \brief Represents an MPLS PDU
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*/
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class TINS_API MPLS : public PDU {
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public:
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/**
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* \brief This PDU's flag.
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*/
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static const PDU::PDUType pdu_flag = PDU::MPLS;
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/**
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* \brief Default constructor
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*/
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MPLS();
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/**
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* \brief Construct an MPLS layer from an ICMP extension
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*
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* This will use the extension's payload to build this packet.
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* The extension's class and type are not checked.
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*
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*/
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MPLS(const ICMPExtension& extension);
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/**
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* \brief Constructor from buffer
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*/
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MPLS(const uint8_t* buffer, uint32_t total_sz);
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/**
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* \brief Getter for the label field.
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*/
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small_uint<20> label() const {
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return (Endian::be_to_host(header_.label_high) << 4) |
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((header_.label_low_exp_and_bottom >> 4) & 0xf);
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}
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/**
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* \brief Getter for the experimental field.
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*/
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small_uint<3> experimental() const {
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return (header_.label_low_exp_and_bottom >> 1) & 0x7;
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}
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/**
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* \brief Getter for the bottom of the stack field.
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*/
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small_uint<1> bottom_of_stack() const {
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return header_.label_low_exp_and_bottom & 0x1;
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}
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/**
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* \brief Getter for the ttl field.
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*/
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uint8_t ttl() const {
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return header_.ttl;
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}
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/**
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* \brief Setter for the label field
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*
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* \param value The new label field value
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*/
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void label(small_uint<20> value);
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/**
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* \brief Setter for the experimental field
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*
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* \param value The new experimental field value
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*/
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void experimental(small_uint<3> value);
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/**
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* \brief Setter for the bottom of the stack field
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*
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* Note that if this MPLS layer is somewhere between an Ethernet and IP
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* layers, the bottom of the stack field will be overriden and set
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* automatically. You should only set this field when constructing ICMP
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* extensions.
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*
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* \param value The new bottom of the stack field value
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*/
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void bottom_of_stack(small_uint<1> value);
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/**
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* \brief Setter for the ttl field
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*
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* \param value The new ttl field value
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*/
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void ttl(uint8_t value);
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/**
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* \brief Returns the MPLS frame's header length.
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*
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* \return The header's size.
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* \sa PDU::header_size()
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*/
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uint32_t header_size() const;
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/**
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* \brief Getter for the PDU's type.
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* \sa PDU::pdu_type
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*/
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PDUType pdu_type() const {
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return pdu_flag;
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}
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/**
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* \sa PDU::clone
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*/
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MPLS* clone() const {
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return new MPLS(*this);
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}
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private:
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TINS_BEGIN_PACK
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struct mpls_header {
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uint16_t label_high;
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uint8_t label_low_exp_and_bottom;
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uint8_t ttl;
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} TINS_END_PACK;
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void write_serialization(uint8_t* buffer, uint32_t total_sz);
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mpls_header header_;
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};
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} // Tins
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#endif // TINS_MPLS_H
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