netfilter: nft_meta: move pkttype handling to helper
When pkttype is loopback, nft_meta performs guesswork to detect broad/multicast packets. Place this in a helper, this is hardly a hot path. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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