[nftables] handle when adding new chain/rule

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Hi Pablo,

I think the issue we saw when adding new chain with a given handle
also occurs with rules:

net/netfilter/nf_tables_api.c -- about line 838
net/netfilter/nf_tables_api.c -- about line 1560

I see that the kernel is intended to allocate a new handle in both
cases (chain & rule), calling nf_tables_alloc_handle().

My personal thought is that this may be problematic, dont you? How to face this?

Regards.
--
Arturo Borrero González
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