private void AnalyzeICMP(TrafficDescriptionFrame tdf)
{
IPFrame ipFrame = GetIPv6Frame(tdf);
NeighborAdvertisment icmpNeighborAdvertisment = (NeighborAdvertisment)GetFrameByType(tdf, NeighborAdvertisment.DefaultFrameType);
NeighborSolicitation icmpNeighborSolicitation = (NeighborSolicitation)GetFrameByType(tdf, NeighborSolicitation.DefaultFrameType);
if (ipFrame != null && icmpNeighborAdvertisment != null && icmpNeighborAdvertisment.EncapsulatedFrame != null)
{
NeighborDiscoveryOption ndOption = (NeighborDiscoveryOption)GetFrameByType(icmpNeighborAdvertisment, NeighborDiscoveryOption.DefaultFrameType);
if (ndOption.OptionData != null && ndOption.OptionType == NeighborDiscoveryOptionType.TargetLinkLayerAddress)
{
MACAddress macTarget = new MACAddress(ndOption.OptionData);
if (!UsesSpoofedAddress(macTarget))
{
if (!(arpHostTable.Contains(icmpNeighborAdvertisment.TargetAddress) && !icmpNeighborAdvertisment.OverrideFlag))
{
UpdateAddressTable(macTarget, icmpNeighborAdvertisment.TargetAddress);
}
}
}
}
else if (ipFrame != null && icmpNeighborSolicitation != null && icmpNeighborSolicitation.EncapsulatedFrame != null)
{
NeighborDiscoveryOption ndOption = (NeighborDiscoveryOption)GetFrameByType(icmpNeighborSolicitation, NeighborDiscoveryOption.DefaultFrameType);
if (ndOption.OptionData != null && ndOption.OptionType == NeighborDiscoveryOptionType.SourceLinkLayerAddress)
{
MACAddress macTarget = new MACAddress(ndOption.OptionData);
if (!UsesSpoofedAddress(macTarget))
{
UpdateAddressTable(macTarget, ipFrame.SourceAddress);
}
}
}
}
private void HandleICMP(EthernetFrame fFrame)
{
IPFrame ipFrame = GetIPFrame(fFrame);
NeighborSolicitation icmpNeighborSolicitation = (NeighborSolicitation)GetFrameByType(fFrame, NeighborSolicitation.DefaultFrameType);
if (ipFrame != null && icmpNeighborSolicitation != null)
{
if (this.ContainsAddress(icmpNeighborSolicitation.TargetAddress))
{
SendICMPNeighborAdvertisment(ipFrame.SourceAddress, icmpNeighborSolicitation.TargetAddress);
}
}
}
private void SendICMPNeighborSolicitation(IPAddress ipaQuery, IPAddress ipaSource)
{
if (ipaQuery.AddressFamily != System.Net.Sockets.AddressFamily.InterNetworkV6)
{
throw new InvalidOperationException("Cannot send an ICMP Neighbor Solicitation for a non IPv6 address.");
}
ICMPv6Frame icmpFrame = new ICMPv6Frame();
icmpFrame.ICMPv6Type = ICMPv6Type.NeighborSolicitation;
icmpFrame.ICMPCode = 0;
NeighborSolicitation icmpDiscoveryMessage = new NeighborSolicitation();
icmpDiscoveryMessage.TargetAddress = ipaQuery;
NeighborDiscoveryOption icmpDiscoveryOption = new NeighborDiscoveryOption();
icmpDiscoveryOption.OptionType = ICMP.V6.NeighborDiscoveryOptionType.SourceLinkLayerAddress;
icmpDiscoveryOption.OptionData = this.PrimaryMACAddress.AddressBytes;
IPv6Frame ipFrame = new IPv6Frame();
ipFrame.SourceAddress = ipaSource;
ipFrame.DestinationAddress = IPAddressAnalysis.GetSolicitedNodeMulticastAddress(ipaQuery);
ipFrame.NextHeader = IPProtocol.IPv6_ICMP;
EthernetFrame ethFrame = new EthernetFrame();
ethFrame.Destination = MACAddress.MulticastFromIPv6Address(ipaQuery);
ethFrame.Source = PrimaryMACAddress;
ethFrame.EtherType = EtherType.IPv6;
ethFrame.EncapsulatedFrame = ipFrame;
ipFrame.EncapsulatedFrame = icmpFrame;
icmpFrame.EncapsulatedFrame = icmpDiscoveryMessage;
icmpDiscoveryMessage.EncapsulatedFrame = icmpDiscoveryOption;
icmpFrame.Checksum = icmpFrame.CalculateChecksum(ipFrame.GetPseudoHeader());
this.Send(ethFrame);
}
