netfilter: nf_tables: add NFTA_SET_ELEM_KEY_END attribute
Add NFTA_SET_ELEM_KEY_END attribute to convey the closing element of the
interval between kernel and userspace.
This patch also adds the NFT_SET_EXT_KEY_END extension to store the
closing element value in this interval.
v4: No changes
v3: New patch
[sbrivio: refactor error paths and labels; add corresponding
nft_set_ext_type for new key; rebase]
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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