Re: checksum calculation for an OUTPUT DNATted packet

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On Friday 2009-01-02 23:47, Giacomo wrote:

>Hi to everybody.
>
>Implementing a kernel module that changes an IP or port in a packet in
>OUTPUT (realizing the so
>called OUTPUT DNAT), I have to recalculate the checksum of the packet.
>
>It is not clear to me if I have to use tcp_v4_check or csum_tcpudp_magic.

See the RAWDNAT branch of Xtables-addons where this is already done
(at least I hope it's correct - have not done much with it lately):

http://dev.medozas.de/gitweb.cgi?p=xtables-addons;a=blob;f=extensions/xt_RAWNAT.c;hb=RAWNAT#l73
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