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Date:   Thu, 23 Apr 2020 16:34:25 +0200
From:   Florian Westphal <fw@strlen.de>
To:     Milan JEANTON <m.jeanton@newquest.fr>
Cc:     netfilter-devel@vger.kernel.org
Subject: Re: Problem with flushing nftalbes sets
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Milan JEANTON <m.jeanton@newquest.fr> wrote:
> table ip test {
>         set tmp {
>                 type ipv4_addr
>         }
> }
> 
> I can add elements in my set without any problem, I can also delete them one
> by one.
> 
> The problem I have is that I need to delete all the elements in the tmp set
> and as precised in the manual of nftables I could flush the elements of a
> set:
> 
> SETS
> [...]
> flush    Remove all elements from the specified set.
> 
> But when I use the command to flush my sets, it doesn't work and displays me
> an error message
> 
> nft 'flush set test tmp'
> Error: Could not process rule: Invalid argument
> flush set test tmp
> ^^^^^^^^^^^^^^^^^^^

Its expected to work from Linux 4.10 onwards.

# nft list ruleset
table ip test {
        set tmp {
                type ipv4_addr
                elements = { 1.2.3.4, 5.6.7.8 }
        }
}
# nft flush set test tmp
# nft list ruleset
table ip test {
        set tmp {
                type ipv4_addr
        }
}
# uname -sr
Linux 5.5.17