netdev - Re: [PATCH net-next v3 1/5] tc/act: user space can't use TC_ACT

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Date:   Wed, 25 Jul 2018 07:55:06 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Daniel Borkmann <daniel@...earbox.net>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Eyal Birger <eyal.birger@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 1/5] tc/act: user space can't use
 TC_ACT_REDIRECT directly

On 24/07/18 04:06 PM, Paolo Abeni wrote:

> --- a/net/sched/act_api.c
> +++ b/net/sched/act_api.c
> @@ -895,6 +895,11 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
>   		}
>   	}
>   
> +	if (a->tcfa_action == TC_ACT_REDIRECT) {
> +		net_warn_ratelimited("TC_ACT_REDIRECT can't be used directly");
> +		a->tcfa_action = TC_ACT_UNSPEC;
> +	}
> +

Why not just reject the rule instead of changing the code underneath the
user?

cheers,
jamal