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This patch adds the NF_INET_INGRESS pseudohook for the NFPROTO_INET family. This is a mapping this new hook to the existing NFPROTO_NETDEV and NF_NETDEV_INGRESS hook. The hook does not guarantee that packets are inet only, users must filter out non-ip traffic explicitly. This infrastructure makes it easier to support this new hook in nf_tables. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>