linux-kernel - Re: [PATCH ghak124 v3] audit: log nftables configuration change events

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Date:   Thu, 18 Feb 2021 23:42:00 +0100
From:   Florian Westphal <fw@...len.de>
To:     Richard Guy Briggs <rgb@...hat.com>
Cc:     Florian Westphal <fw@...len.de>, Phil Sutter <phil@....cc>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Audit Mailing List <linux-audit@...hat.com>,
        netfilter-devel@...r.kernel.org, twoerner@...hat.com,
        Eric Paris <eparis@...isplace.org>, tgraf@...radead.org
Subject: Re: [PATCH ghak124 v3] audit: log nftables configuration change
 events

Richard Guy Briggs <rgb@...hat.com> wrote:
> > If they appear in a batch tehy will be ignored, if the batch consists of
> > such non-modifying ops only then nf_tables_commit() returns early
> > because the transaction list is empty (nothing to do/change).
> 
> Ok, one little inconvenient question: what about GETOBJ_RESET?  That
> looks like a hybrid that modifies kernel table counters and reports
> synchronously.  That could be a special case call in
> nf_tables_dump_obj() and nf_tables_getobj().  Will that cause a storm
> per commit?

No, since they can't be part of a commit (they don't implement the
'call_batch' function).

I'm not sure GETOBJ_RESET should be reported in the first place:
RESET only affects expr internal state, and that state changes all the time
anyway in response to network traffic.