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netfilter: evict stale entries on netlink dumps
When dumping we already have to look at the entire table, so we might as well toss those entries whose timeout value is in the past. We also look at every entry during resize operations. However, eviction there is not as simple because we hold the global resize lock so we can't evict without adding a 'expired' list to drop from later. Considering that resizes are very rare it doesn't seem worth doing it. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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