Re: [iptables PATCH v3 21/21] xtables: Do not change ruleset while listing

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On Thu, Dec 20, 2018 at 04:09:22PM +0100, Phil Sutter wrote:
> When only listing rules, avoid to create the basic ruleset. Initializing
> the latter is still needed so that a completely empty ruleset does not
> lead to no output. But with builtin chains being added to cache
> immediately, there is no need to push the changes to the kernel anymore.
> Avoid this by calling nft_abort() in the right spots.
> 
> Signed-off-by: Phil Sutter <phil@xxxxxx>
> ---
>  iptables/xtables-arp.c | 1 +
>  iptables/xtables-eb.c  | 1 +
>  iptables/xtables.c     | 4 ++++
>  3 files changed, 6 insertions(+)
> 
> diff --git a/iptables/xtables-arp.c b/iptables/xtables-arp.c
> index 2f369d9aadb01..10cc4c9fbc875 100644
> --- a/iptables/xtables-arp.c
> +++ b/iptables/xtables-arp.c
> @@ -1366,6 +1366,7 @@ int do_commandarp(struct nft_handle *h, int argc, char *argv[], char **table,
>  				   options&OPT_NUMERIC,
>  				   /*options&OPT_EXPANDED*/0,
>  				   options&OPT_LINENUMBERS);
> +		nft_abort(h);

Hm, this call to nft_abort() is confusing. Listing does not require a
batch mode.

This patch is new in the batch IIRC, will keep this back until we
discuss if there is a better fix.



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