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

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Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote:
> On Mon, Sep 12, 2016 at 09:00:25PM +0200, Florian Westphal wrote:
> > 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?
> 
> What I'm proposing is to represent this as a concatenation, since this
> represents the tuple that you use to look up for route.
> 
> > (i.e., how do i know where in the sreg e.g. the daddr is
> >  that i need to stuff in the flowi struct?)
> 
> You can iterate over the concatenation compound from the
> netlink_linearize path, it is just a list of expressions. Then, you
> can set the NFTA_FIB_* netlink attribute using them.

Ah, ok.  Interesting idea, I'll give this a shot.
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