Re: [RFC] nftables: reverse path filtering for nft

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Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote:
>         fib lookup ip daddr . oif
> 
> As you are basically looking for the route based on IPv4 address and
> the output interface, so this boils down to:
> 
>         fib lookup $expr $flags

How would the kernel disentangle the register data?
(i.e., how do i know where in the sreg e.g. the daddr is
 that i need to stuff in the flowi struct?)
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