netfilter: snat: evict closing tcp entries on reply tuple collision
When all tried source tuples are in use, the connection request (skb)
and the new conntrack will be dropped in nf_confirm() due to the
non-recoverable clash.
Make it so that the last 32 attempts are allowed to evict a colliding
entry if this connection is already closing and the new sequence number
has advanced past the old one.
Such "all tuples taken" secenario can happen with tcp-rpc workloads where
same dst:dport gets queried repeatedly.
Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>