[PATCH v5] audit: log nftables configuration change events once per table

[Pablo Neira Ayuso]

On Fri, Mar 26, 2021 at 01:38:59PM -0400, Richard Guy Briggs wrote:
> Reduce logging of nftables events to a level similar to iptables.
> Restore the table field to list the table, adding the generation.
> 
> Indicate the op as the most significant operation in the event.

There's a UAF, Florian reported. I'm attaching an incremental fix.

nf_tables_commit_audit_collect() refers to the trans object which
might have been already released.
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