On Tue, 2019-08-20 at 07:36 +0200, Florian Westphal wrote:
> Wouldn't fib_netdev.c have the same problem?
Probably, but I haven't hit this issue yet.

> If so, might be better to place this test in both
> nft_fib6_eval_type and nft_fib6_eval.
I think that is possible, and not very hard to do.

But in my humble viewpoint, it looks like it's nft_fib_inet_eval() and
nft_fib_netdev_eval() have the responsibility to choose a valid
protocol or drop the package. 
I am not sure if it would be a good move to transfer this
responsibility to nft_fib6_eval_type() and nft_fib6_eval(), so I would
rather add the same test to nft_fib_netdev_eval().

Does it make sense?

Thanks for the feedback!

Leonardo Bras