netfilter: nf_tables: add userdata attributes to nft_chain
Enables storing userdata for nft_chain. Field udata points to user data and udlen stores its length. Adds new attribute flag NFTA_CHAIN_USERDATA. Signed-off-by: NJose M. Guisado Gomez <guigom@riseup.net> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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