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Preparing for partial caches, it is necessary to make sure these
functions don't cause harm if called repeatedly.
* Use h->cache->tables pointer as indicator for existing table cache,
return immediately from fetch_table_cache() if non-NULL.
* Initialize table's chain list only if non-NULL.
* Search for chain in table's chain list before adding it.
* Don't fetch rules for a chain if it has any rules already. With rule
list being embedded in struct nftnl_chain, this is the best way left
to check if rules have been fetched already or not. It will fail for
empty chains, but causes no harm in that case, either.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The function is used to return the given table's chains, so fetching
chain cache is enough.
Add calls to nft_build_cache() in places where a rule cache is required.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Replace the simple have_cache boolean by a cache level indicator
defining how complete the cache is. Since have_cache indicated full
cache (including rules), make code depending on it check for cache level
NFT_CL_RULES.
Core cache fetching routine __nft_build_cache() accepts a new level via
parameter and raises cache completeness to that level.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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The amount of code dealing with caching only is considerable and hence
deserves an own source file.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
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