2021-01-09 01:45:26 -06:00
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/*
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Copyright (C) 2021 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 _GRE_H
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#define _GRE_H
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#include "abstractprotocol.h"
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#include "gre.pb.h"
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/*
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GRE Protocol Frame Format (RFC2890)-
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|C| |K|S| Reserved0 | Ver | Protocol Type |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Checksum (optional) | Reserved1 (Optional) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Key (optional) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sequence Number (Optional) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figures in brackets represent field width in bits
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*/
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#define GRE_FLAG_CKSUM 0x8
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#define GRE_FLAG_KEY 0x2
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#define GRE_FLAG_SEQ 0x1
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class GreProtocol : public AbstractProtocol
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{
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public:
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enum grefield
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{
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// Frame Fields
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gre_flags = 0,
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gre_rsvd0,
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gre_version,
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gre_protocol,
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gre_checksum,
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gre_rsvd1,
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gre_key,
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gre_sequence,
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2022-05-25 04:46:33 -05:00
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// Meta Fields
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gre_isOverrideChecksum,
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2021-01-09 01:45:26 -06:00
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gre_fieldCount
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};
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GreProtocol(StreamBase *stream, AbstractProtocol *parent = 0);
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virtual ~GreProtocol();
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static AbstractProtocol* createInstance(StreamBase *stream,
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AbstractProtocol *parent = 0);
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virtual quint32 protocolNumber() const;
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virtual void protoDataCopyInto(OstProto::Protocol &protocol) const;
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virtual void protoDataCopyFrom(const OstProto::Protocol &protocol);
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virtual ProtocolIdType protocolIdType() const;
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virtual quint32 protocolId(ProtocolIdType type) const;
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virtual QString name() const;
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virtual QString shortName() const;
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virtual int fieldCount() const;
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virtual AbstractProtocol::FieldFlags fieldFlags(int index) const;
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virtual QVariant fieldData(int index, FieldAttrib attrib,
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int streamIndex = 0) const;
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virtual bool setFieldData(int index, const QVariant &value,
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FieldAttrib attrib = FieldValue);
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virtual int protocolFrameSize(int streamIndex = 0) const;
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private:
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OstProto::Gre data;
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};
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#endif
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