Re: RFC: nftables does not allow to delete a rule twice

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Hi,

On Fri, Feb 15, 2019 at 10:50:42AM +0100, Pablo Neira Ayuso wrote:
[...]
> > From the flush path, we can skip requests for deletion of rules that
> > have been already deleted, ie. we add no transaction since there is
> > already one in place.

Thanks for the quick fix!

> nft_delrule_by_chain() is always called from flush path. We can apply
> this smaller fix I think.

> diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> index 5a92f23f179f..4893f248dfdc 100644
> --- a/net/netfilter/nf_tables_api.c
> +++ b/net/netfilter/nf_tables_api.c
> @@ -313,6 +313,9 @@ static int nft_delrule_by_chain(struct nft_ctx *ctx)
>  	int err;
>  
>  	list_for_each_entry(rule, &ctx->chain->rules, list) {
> +		if (!nft_is_active_next(ctx->net, rule))
> +			continue;
> +
>  		err = nft_delrule(ctx, rule);
>  		if (err < 0)
>  			return err;

Successfully tested with my ebtables-nft bug:

| # ebtables-nft -N foo
| # ebtables-nft -F

(Batch then contains policy rule delete and chain flush.)

Acked-by: Phil Sutter <phil@xxxxxx>

Thanks, Phil



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