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If there is a significant amount of chains list search is too slow, so add an rhlist table for this. This speeds up ruleset loading: for every new rule we have to check if the name already exists in current generation. We need to be able to cope with duplicate chain names in case a transaction drops the nfnl mutex (for request_module) and the abort of this old transaction is still pending. The list is kept -- we need a way to iterate chains even if hash resize is in progress without missing an entry. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>