ip/tcp checksumming

ip/tcp checksumming

[Ivan Chernyavsky]

Hi all,

I'm using ip_queue target with packet modification in a userspace
program. So, I need to recompute packet checksums.

I found several references in netfilter-users mailing list telling
that some patch was expected to provide helper functions (including
checksumming). Unfortunately, I wasn't able to find that patch.

I understand that it's in fact very simple to write my own
checksumming routine, but if one should think about performance it
seems to be better to use "official" one =)

Could you please point me to some resource? Thanks in advance,

-- 
   Ivan