netfilter: nft_dynset: do not reject set updates with NFT_SET_EVAL
NFT_SET_EVAL is signalling the kernel that this sets can be updated from the evaluation path, even if there are no expressions attached to the element. Otherwise, set updates with no expressions fail. Update description to describe the right semantics. Fixes: 22fe54d5 ("netfilter: nf_tables: add support for dynamic set updates") Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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