Re: UDP encapsulation of SCTP packages

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On Thu, Jul 18, 2013 at 08:47:09PM +0200, Fabian Bergmark wrote:
> Im working on implementing UDP encapsulation of SCTP packages.
> 
> I have tried to implement  the encapsulation/decapsulation in a way
> that is transparent to the logic of the current implementation.
> 
> Currently I'am able to send and recieve data over localhost or over
> intranet. However, when trying to communicate over NAT I ran in to
> problems. Because of port remapping of the UDP source port I included
> as a final step to update the source port of the SCTP header and
> recalculate the checksum.
> 
> This however, causes a kernel panic somewhere between receiving the
> UDP packet and replying the INIT_ACK, that I am unable to understand.
> Is there anything, besides the source port and checksum in the SCTP
> header that needs to be updated?
> 
> I have included a packet capture of the INIT-packages that causes the panic.
> 
> As I am new to kernel development, general advice on how to debug this
> issue is appreciated.
> 
> -- Fabian Bergmark

The backtrace of the panic would be useful here, please.
Regards
Neil

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