netfilter: nft_nat: allow to specify layer 4 protocol NAT only
nft_nat reports a bogus EAFNOSUPPORT if no layer 3 information is specified. Fixes: d07db988 ("netfilter: nf_tables: introduce nft_validate_register_load()") Signed-off-by:Pablo Neira Ayuso <pablo@netfilter.org>
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30a56a2b