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|
/*
Copyright (C) 2010 Srivats P.
This file is part of "Ostinato"
This is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
#include "ip4.h"
#include <QHostAddress>
Ip4Protocol::Ip4Protocol(StreamBase *stream, AbstractProtocol *parent)
: AbstractProtocol(stream, parent)
{
}
Ip4Protocol::~Ip4Protocol()
{
}
AbstractProtocol* Ip4Protocol::createInstance(StreamBase *stream,
AbstractProtocol *parent)
{
return new Ip4Protocol(stream, parent);
}
quint32 Ip4Protocol::protocolNumber() const
{
return OstProto::Protocol::kIp4FieldNumber;
}
void Ip4Protocol::protoDataCopyInto(OstProto::Protocol &protocol) const
{
protocol.MutableExtension(OstProto::ip4)->CopyFrom(data);
protocol.mutable_protocol_id()->set_id(protocolNumber());
}
void Ip4Protocol::protoDataCopyFrom(const OstProto::Protocol &protocol)
{
if (protocol.protocol_id().id() == protocolNumber() &&
protocol.HasExtension(OstProto::ip4))
data.MergeFrom(protocol.GetExtension(OstProto::ip4));
}
QString Ip4Protocol::name() const
{
return QString("Internet Protocol ver 4");
}
QString Ip4Protocol::shortName() const
{
return QString("IPv4");
}
AbstractProtocol::ProtocolIdType Ip4Protocol::protocolIdType() const
{
return ProtocolIdIp;
}
quint32 Ip4Protocol::protocolId(ProtocolIdType type) const
{
switch(type)
{
case ProtocolIdLlc: return 0x060603;
case ProtocolIdEth: return 0x0800;
case ProtocolIdIp: return 0x04;
default:break;
}
return AbstractProtocol::protocolId(type);
}
int Ip4Protocol::fieldCount() const
{
return ip4_fieldCount;
}
AbstractProtocol::FieldFlags Ip4Protocol::fieldFlags(int index) const
{
AbstractProtocol::FieldFlags flags;
flags = AbstractProtocol::fieldFlags(index);
switch (index)
{
case ip4_ver:
case ip4_hdrLen:
case ip4_tos:
case ip4_totLen:
case ip4_id:
case ip4_flags:
case ip4_fragOfs:
case ip4_ttl:
case ip4_proto:
break;
case ip4_cksum:
flags |= CksumField;
break;
case ip4_srcAddr:
case ip4_dstAddr:
case ip4_options:
break;
case ip4_isOverrideVer:
case ip4_isOverrideHdrLen:
case ip4_isOverrideTotLen:
case ip4_isOverrideProto:
case ip4_isOverrideCksum:
case ip4_srcAddrMode:
case ip4_srcAddrCount:
case ip4_srcAddrMask:
case ip4_dstAddrMode:
case ip4_dstAddrCount:
case ip4_dstAddrMask:
flags &= ~FrameField;
flags |= MetaField;
break;
default:
break;
}
return flags;
}
QVariant Ip4Protocol::fieldData(int index, FieldAttrib attrib,
int streamIndex) const
{
switch (index)
{
case ip4_ver:
{
int ver;
ver = data.is_override_ver() ? (data.ver_hdrlen() >> 4) & 0x0F : 4;
switch(attrib)
{
case FieldName:
return QString("Version");
case FieldValue:
return ver;
case FieldTextValue:
return QString("%1").arg(ver, 1, BASE_HEX, QChar('0'));
case FieldFrameValue:
return QByteArray(1, (char) ver);
case FieldBitSize:
return 4;
default:
break;
}
break;
}
case ip4_hdrLen:
{
int hdrlen;
hdrlen = data.is_override_hdrlen() ?
data.ver_hdrlen() : 5 + data.options().length()/4;
hdrlen &= 0x0F;
switch(attrib)
{
case FieldName:
return QString("Header Length");
case FieldValue:
return hdrlen;
case FieldTextValue:
return QString("%1").arg(hdrlen, 1, BASE_HEX, QChar('0'));
case FieldFrameValue:
return QByteArray(1, (char) hdrlen);
case FieldBitSize:
return 4;
default:
break;
}
break;
}
case ip4_tos:
switch(attrib)
{
case FieldName:
return QString("TOS/DSCP");
case FieldValue:
return data.tos();
case FieldFrameValue:
return QByteArray(1, (char) data.tos());
case FieldTextValue:
return QString("0x%1").
arg(data.tos(), 2, BASE_HEX, QChar('0'));;
default:
break;
}
break;
case ip4_totLen:
{
int ipLen = 20 + data.options().length();
switch(attrib)
{
case FieldName:
return QString("Total Length");
case FieldValue:
{
int totlen;
totlen = data.is_override_totlen() ? data.totlen() :
(protocolFramePayloadSize(streamIndex) + ipLen);
return totlen;
}
case FieldFrameValue:
{
QByteArray fv;
int totlen;
totlen = data.is_override_totlen() ? data.totlen() :
(protocolFramePayloadSize(streamIndex) + ipLen);
fv.resize(2);
qToBigEndian((quint16) totlen, (uchar*) fv.data());
return fv;
}
case FieldTextValue:
{
int totlen;
totlen = data.is_override_totlen() ? data.totlen() :
(protocolFramePayloadSize(streamIndex) + ipLen);
return QString("%1").arg(totlen);
}
case FieldBitSize:
return 16;
default:
break;
}
break;
}
case ip4_id:
switch(attrib)
{
case FieldName:
return QString("Identification");
case FieldValue:
return data.id();
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian((quint16) data.id(), (uchar*)fv.data());
return fv;
}
case FieldTextValue:
return QString("0x%1").
arg(data.id(), 2, BASE_HEX, QChar('0'));;
default:
break;
}
break;
case ip4_flags:
switch(attrib)
{
case FieldName:
return QString("Flags");
case FieldValue:
return data.flags();
case FieldFrameValue:
return QByteArray(1, (char) data.flags());
case FieldTextValue:
{
QString s;
s.append("Unused:");
s.append(data.flags() & IP_FLAG_UNUSED ? "1" : "0");
s.append(" Don't Fragment:");
s.append(data.flags() & IP_FLAG_DF ? "1" : "0");
s.append(" More Fragments:");
s.append(data.flags() & IP_FLAG_MF ? "1" : "0");
return s;
}
case FieldBitSize:
return 3;
default:
break;
}
break;
case ip4_fragOfs:
switch(attrib)
{
case FieldName:
return QString("Fragment Offset");
case FieldValue:
return data.frag_ofs();
case FieldFrameValue:
{
QByteArray fv;
fv.resize(2);
qToBigEndian((quint16) (data.frag_ofs()),
(uchar*) fv.data());
return fv;
}
case FieldTextValue:
return QString("%1").arg(data.frag_ofs()*8);
case FieldBitSize:
return 13;
default:
break;
}
break;
case ip4_ttl:
switch(attrib)
{
case FieldName:
return QString("Time to Live");
case FieldValue:
return data.ttl();
case FieldFrameValue:
return QByteArray(1, (char)data.ttl());
case FieldTextValue:
return QString("%1").arg(data.ttl());
default:
break;
}
break;
case ip4_proto:
{
switch(attrib)
{
case FieldName:
return QString("Protocol");
case FieldValue:
{
unsigned char id = data.is_override_proto() ?
data.proto() : payloadProtocolId(ProtocolIdIp);
return id;
}
case FieldFrameValue:
{
unsigned char id = data.is_override_proto() ?
data.proto() : payloadProtocolId(ProtocolIdIp);
return QByteArray(1, (char) id);
}
case FieldTextValue:
{
unsigned char id = data.is_override_proto() ?
data.proto() : payloadProtocolId(ProtocolIdIp);
return QString("0x%1").
arg(id, 2, BASE_HEX, QChar('0'));
}
default:
break;
}
break;
}
case ip4_cksum:
{
switch(attrib)
{
case FieldName:
return QString("Header Checksum");
case FieldValue:
{
quint16 cksum;
if (data.is_override_cksum())
cksum = data.cksum();
else
cksum = protocolFrameCksum(streamIndex, CksumIp);
return cksum;
}
case FieldFrameValue:
{
QByteArray fv;
quint16 cksum;
if (data.is_override_cksum())
cksum = data.cksum();
else
cksum = protocolFrameCksum(streamIndex, CksumIp);
fv.resize(2);
qToBigEndian((quint16) cksum, (uchar*) fv.data());
return fv;
}
case FieldTextValue:
{
quint16 cksum;
if (data.is_override_cksum())
cksum = data.cksum();
else
cksum = protocolFrameCksum(streamIndex, CksumIp);
return QString("0x%1").
arg(cksum, 4, BASE_HEX, QChar('0'));;
}
case FieldBitSize:
return 16;
default:
break;
}
break;
}
case ip4_srcAddr:
{
int u;
quint32 subnet, host, srcIp = 0;
switch(data.src_ip_mode())
{
case OstProto::Ip4::e_im_fixed:
srcIp = data.src_ip();
break;
case OstProto::Ip4::e_im_inc_host:
u = streamIndex % data.src_ip_count();
subnet = data.src_ip() & data.src_ip_mask();
host = (((data.src_ip() & ~data.src_ip_mask()) + u) &
~data.src_ip_mask());
srcIp = subnet | host;
break;
case OstProto::Ip4::e_im_dec_host:
u = streamIndex % data.src_ip_count();
subnet = data.src_ip() & data.src_ip_mask();
host = (((data.src_ip() & ~data.src_ip_mask()) - u) &
~data.src_ip_mask());
srcIp = subnet | host;
break;
case OstProto::Ip4::e_im_random_host:
subnet = data.src_ip() & data.src_ip_mask();
host = (qrand() & ~data.src_ip_mask());
srcIp = subnet | host;
break;
default:
qWarning("Unhandled src_ip_mode = %d", data.src_ip_mode());
}
switch(attrib)
{
case FieldName:
return QString("Source");
case FieldValue:
return srcIp;
case FieldFrameValue:
{
QByteArray fv;
fv.resize(4);
qToBigEndian(srcIp, (uchar*) fv.data());
return fv;
}
case FieldTextValue:
return QHostAddress(srcIp).toString();
default:
break;
}
break;
}
case ip4_dstAddr:
{
int u;
quint32 subnet, host, dstIp = 0;
switch(data.dst_ip_mode())
{
case OstProto::Ip4::e_im_fixed:
dstIp = data.dst_ip();
break;
case OstProto::Ip4::e_im_inc_host:
u = streamIndex % data.dst_ip_count();
subnet = data.dst_ip() & data.dst_ip_mask();
host = (((data.dst_ip() & ~data.dst_ip_mask()) + u) &
~data.dst_ip_mask());
dstIp = subnet | host;
break;
case OstProto::Ip4::e_im_dec_host:
u = streamIndex % data.dst_ip_count();
subnet = data.dst_ip() & data.dst_ip_mask();
host = (((data.dst_ip() & ~data.dst_ip_mask()) - u) &
~data.dst_ip_mask());
dstIp = subnet | host;
break;
case OstProto::Ip4::e_im_random_host:
subnet = data.dst_ip() & data.dst_ip_mask();
host = (qrand() & ~data.dst_ip_mask());
dstIp = subnet | host;
break;
default:
qWarning("Unhandled dst_ip_mode = %d", data.dst_ip_mode());
}
switch(attrib)
{
case FieldName:
return QString("Destination");
case FieldValue:
return dstIp;
case FieldFrameValue:
{
QByteArray fv;
fv.resize(4);
qToBigEndian((quint32) dstIp, (uchar*) fv.data());
return fv;
}
case FieldTextValue:
return QHostAddress(dstIp).toString();
default:
break;
}
break;
}
case ip4_options:
{
QByteArray ba;
switch(attrib)
{
case FieldValue:
case FieldFrameValue:
case FieldTextValue:
ba.append(data.options().c_str(), data.options().length());
default:
break;
}
switch(attrib)
{
case FieldName:
return QString("Options");
case FieldValue:
case FieldFrameValue:
return ba;
case FieldTextValue:
return ba.toHex();
default:
break;
}
break;
}
// Meta fields
case ip4_isOverrideVer:
switch(attrib)
{
case FieldValue: return data.is_override_ver();
default: break;
}
break;
case ip4_isOverrideHdrLen:
switch(attrib)
{
case FieldValue: return data.is_override_hdrlen();
default: break;
}
break;
case ip4_isOverrideTotLen:
switch(attrib)
{
case FieldValue: return data.is_override_totlen();
default: break;
}
break;
case ip4_isOverrideProto:
switch(attrib)
{
case FieldValue: return data.is_override_proto();
default: break;
}
break;
case ip4_isOverrideCksum:
switch(attrib)
{
case FieldValue: return data.is_override_cksum();
default: break;
}
break;
case ip4_srcAddrMode:
switch(attrib)
{
case FieldValue: return data.src_ip_mode();
default: break;
}
break;
case ip4_srcAddrCount:
switch(attrib)
{
case FieldValue: return data.src_ip_count();
default: break;
}
break;
case ip4_srcAddrMask:
switch(attrib)
{
case FieldValue: return data.src_ip_mask();
default: break;
}
break;
case ip4_dstAddrMode:
switch(attrib)
{
case FieldValue: return data.dst_ip_mode();
default: break;
}
break;
case ip4_dstAddrCount:
switch(attrib)
{
case FieldValue: return data.dst_ip_count();
default: break;
}
break;
case ip4_dstAddrMask:
switch(attrib)
{
case FieldValue: return data.dst_ip_mask();
default: break;
}
break;
default:
break;
}
return AbstractProtocol::fieldData(index, attrib, streamIndex);
}
bool Ip4Protocol::setFieldData(int index, const QVariant &value,
FieldAttrib attrib)
{
bool isOk = false;
if (attrib != FieldValue)
goto _exit;
switch (index)
{
case ip4_ver:
{
uint version = value.toUInt(&isOk);
if (isOk)
data.set_ver_hdrlen(
((version & 0xF) << 4)
| (data.ver_hdrlen() & 0x0F));
break;
}
case ip4_hdrLen:
{
uint hdrLen = value.toUInt(&isOk);
if (isOk)
data.set_ver_hdrlen(
(data.ver_hdrlen() & 0xF0)
| (hdrLen & 0x0F));
break;
}
case ip4_tos:
{
uint tos = value.toUInt(&isOk);
if (isOk)
data.set_tos(tos);
break;
}
case ip4_totLen:
{
uint totLen = value.toUInt(&isOk);
if (isOk)
data.set_totlen(totLen);
break;
}
case ip4_id:
{
uint id = value.toUInt(&isOk);
if (isOk)
data.set_id(id);
break;
}
case ip4_flags:
{
uint flags = value.toUInt(&isOk);
if (isOk)
data.set_flags(flags);
break;
}
case ip4_fragOfs:
{
uint fragOfs = value.toUInt(&isOk);
if (isOk)
data.set_frag_ofs(fragOfs);
break;
}
case ip4_ttl:
{
uint ttl = value.toUInt(&isOk);
if (isOk)
data.set_ttl(ttl);
break;
}
case ip4_proto:
{
uint proto = value.toUInt(&isOk);
if (isOk)
data.set_proto(proto);
break;
}
case ip4_cksum:
{
uint cksum = value.toUInt(&isOk);
if (isOk)
data.set_cksum(cksum);
break;
}
case ip4_srcAddr:
{
quint32 srcIp = value.toUInt(&isOk);
if (isOk)
data.set_src_ip(srcIp);
break;
}
case ip4_dstAddr:
{
quint32 dstIp = value.toUInt(&isOk);
if (isOk)
data.set_dst_ip(dstIp);
break;
}
case ip4_options:
{
QByteArray ba = value.toByteArray();
int pad = (4 - (ba.size() % 4)) % 4;
if (pad)
ba.append(QByteArray(pad, 0));
data.set_options(ba.constData(), ba.size());
isOk = true;
break;
}
// Meta-fields
case ip4_isOverrideVer:
{
bool ovr = value.toBool();
data.set_is_override_ver(ovr);
isOk = true;
break;
}
case ip4_isOverrideHdrLen:
{
bool ovr = value.toBool();
data.set_is_override_hdrlen(ovr);
isOk = true;
break;
}
case ip4_isOverrideTotLen:
{
bool ovr = value.toBool();
data.set_is_override_totlen(ovr);
isOk = true;
break;
}
case ip4_isOverrideProto:
{
bool ovr = value.toBool();
data.set_is_override_proto(ovr);
isOk = true;
break;
}
case ip4_isOverrideCksum:
{
bool ovr = value.toBool();
data.set_is_override_cksum(ovr);
isOk = true;
break;
}
case ip4_srcAddrMode:
{
uint mode = value.toUInt(&isOk);
if (isOk && data.IpAddrMode_IsValid(mode))
data.set_src_ip_mode(OstProto::Ip4::IpAddrMode(mode));
else
isOk = false;
break;
}
case ip4_srcAddrCount:
{
uint count = value.toUInt(&isOk);
if (isOk)
data.set_src_ip_count(count);
break;
}
case ip4_srcAddrMask:
{
quint32 mask = value.toUInt(&isOk);
if (isOk)
data.set_src_ip_mask(mask);
break;
}
case ip4_dstAddrMode:
{
uint mode = value.toUInt(&isOk);
if (isOk && data.IpAddrMode_IsValid(mode))
data.set_dst_ip_mode(OstProto::Ip4::IpAddrMode(mode));
else
isOk = false;
break;
}
case ip4_dstAddrCount:
{
uint count = value.toUInt(&isOk);
if (isOk)
data.set_dst_ip_count(count);
break;
}
case ip4_dstAddrMask:
{
quint32 mask = value.toUInt(&isOk);
if (isOk)
data.set_dst_ip_mask(mask);
break;
}
default:
qFatal("%s: unimplemented case %d in switch", __PRETTY_FUNCTION__,
index);
break;
}
_exit:
return isOk;
}
int Ip4Protocol::protocolFrameVariableCount() const
{
int count = AbstractProtocol::protocolFrameVariableCount();
if (data.src_ip_mode() != OstProto::Ip4::e_im_fixed)
count = AbstractProtocol::lcm(count, data.src_ip_count());
if (data.dst_ip_mode() != OstProto::Ip4::e_im_fixed)
count = AbstractProtocol::lcm(count, data.dst_ip_count());
return count;
}
quint32 Ip4Protocol::protocolFrameCksum(int streamIndex,
CksumType cksumType, CksumFlags cksumFlags) const
{
switch (cksumType)
{
case CksumIpPseudo:
{
quint32 sum = 0;
QByteArray fv = protocolFrameValue(streamIndex);
const quint8 *p = (quint8*) fv.constData();
sum += *((quint16*)(p + 12)); // src-ip hi
sum += *((quint16*)(p + 14)); // src-ip lo
sum += *((quint16*)(p + 16)); // dst-ip hi
sum += *((quint16*)(p + 18)); // dst-ip lo
// XXX: payload length and protocol are also part of the
// pseudo cksum but for IPv6 we need to skip extension headers to
// get to them, so these two fields are counted in the
// pseudo cksum in AbstractProtocol::protocolFrameHeaderCksum()
// Although not needed for IPv4 case, we do the same for IPv4
// also, so that code there is common for IPv4 and IPv6
while(sum>>16)
sum = (sum & 0xFFFF) + (sum >> 16);
return qFromBigEndian((quint16) ~sum);
}
default:
break;
}
return AbstractProtocol::protocolFrameCksum(
streamIndex, cksumType, cksumFlags);
}
bool Ip4Protocol::hasErrors(QStringList *errors) const
{
bool result = false;
if ((data.dst_ip() == 0)
&& (data.dst_ip_mode() == OstProto::Ip4::e_im_fixed)) {
if (errors)
*errors << QObject::tr("Frames with Destination IP 0.0.0.0 "
"are likely to be dropped");
result = true;
}
if ((data.src_ip() == 0)
&& (data.src_ip_mode() == OstProto::Ip4::e_im_fixed)) {
if (errors)
*errors << QObject::tr("Frames with Source IP 0.0.0.0 "
"may be dropped except for special cases "
"like BOOTP/DHCP");
result = true;
}
return result;
}
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