113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
/*
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Copyright (C) 2023 Srivats P.
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This file is part of "Ostinato"
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This is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#ifndef _PACKET_H
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#define _PACKET_H
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#include <QSet>
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#include <QtGlobal>
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namespace Packet {
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class Parser {
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public:
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Parser(const uchar *data, int length)
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: pktData_(data), pktLen_(length) {}
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quint8 field8(int offset) {
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if (offset >= pktLen_) {
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ok_ = false;
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return 0;
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}
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ok_ = true;
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return pktData_[offset];
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}
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quint16 field16(int offset) {
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if (offset + 1 >= pktLen_) {
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ok_ = false;
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return 0;
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}
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ok_ = true;
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return pktData_[offset] << 8
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| pktData_[offset+1];
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}
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quint32 field32(int offset) {
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if (offset + 3 >= pktLen_) {
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ok_ = false;
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return 0;
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}
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ok_ = true;
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return pktData_[offset] << 24
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| pktData_[offset+1] << 16
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| pktData_[offset+2] << 8
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| pktData_[offset+3];
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}
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bool ok() {
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return ok_;
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}
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private:
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const uchar *pktData_;
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int pktLen_;
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bool ok_{false};
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};
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quint16 l4ChecksumOffset(const uchar *pktData, int pktLen);
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//
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// Constants
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//
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// Ethernet
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const quint16 kEthTypeOffset = 12;
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const quint16 kEthTypeSize = 2;
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const quint16 kIp4EthType = 0x0800;
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const quint16 kIp6EthType = 0x86dd;
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const quint16 kMplsEthType = 0x8847;
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const QSet<quint16> kVlanEthTypes = {0x8100, 0x9100, 0x88a8};
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// VLAN
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const quint16 kVlanTagSize = 4;
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// MPLS
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const quint16 kMplsTagSize = 4;
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// IPv4
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const quint16 kIp4ProtocolOffset = 9;
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// IPv6
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const quint16 kIp6HeaderSize = 40;
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const quint16 kIp6NextHeaderOffset = 6;
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// IPv6 Extension Header
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const quint16 kIp6ExtNextHeaderOffset = 0;
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const quint16 kIp6ExtLengthOffset = 1;
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// IPv4/IPv6 Proto/NextHeader values
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const quint8 kIpProtoTcp = 6;
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const quint8 kIpProtoUdp = 17;
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const QSet<quint8> kIp6ExtensionHeaders = {0, 60, 43, 44, 51, 50, 60, 135}; // FIXME: use names
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// TCP
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const quint16 kTcpChecksumOffset = 16;
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// UDP
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const quint16 kUdpChecksumOffset = 6;
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};
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#endif
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