kernel update procedure

[gerardo airaldi]

 Hello, i´m having some trouble understanding the procedure of kernel
update,
> i´ll like to add mangle support to a kernel so my iptables can do what i´m
> trying to do,
> i´m following this guide :
> http://wiki.laptop.org/go/Rebuilding_OLPC_kernel#Installing_kernel_RPMs
> but, where in fact can i download the kernel sources to modify?
>
> the kernel that is running is Linux xo-43-1a-2d.localdomain
> 2.6.31_xo1.5-20101216.1243.1.
olpc.741a3e67d9e7bb8
>
>
> rgs
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