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Accept an additional chain name pointer in __nft_build_cache() and pass
it along to fetch only that specific chain and its rules.
Enhance nft_build_cache() to take an optional nftnl_chain pointer to
fetch rules for.
Enhance nft_chain_list_get() to take an optional chain name. If cache
level doesn't include chains already, it will fetch only the specified
chain from kernel (if existing) and add that to table's chain list which
is returned. This keeps operations for all chains of a table or a
specific one within the same code path in nft.c.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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