Re: Entirely ignoring TCP and UDP checksum in kernel level

[Brad Campbell]

Josan Kadett wrote:
> Well, the device fails only in one type of operation, that is when it has to
> receive packets from an internal port, it sends packets via its external IP
> address. 
>
> I have managed to disable IP header checksumming by hacking the kernel (in
> file ip_input.c). Now I have to do the same for tcp_input.c and udp.c .
> Packet mangling will not be required because when I turn the rp_filter off,
> the kernel does not care whether it is coming from the intended source or
> not.

Just a completely random thought. What about re-calculating the checksum and correcting it when the 
packet hits the IP layer prior to it being passed out to the relevant protocol handlers?

Regards,
Brad
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