netdev - Re: [PATCH net-next v5 1/4] net/sched: user-space can't set unknown tcfa

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Date:   Mon, 30 Jul 2018 16:21:55 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        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 v5 1/4] net/sched: user-space can't set unknown
 tcfa_action values

Mon, Jul 30, 2018 at 04:03:50PM CEST, jhs@...atatu.com wrote:
>On 30/07/18 08:30 AM, Paolo Abeni wrote:
>>   	}
>> +	if (!tcf_action_valid(a->tcfa_action)) {
>> +		NL_SET_ERR_MSG(extack, "invalid action value, using TC_ACT_UNSPEC instead");
>> +		a->tcfa_action = TC_ACT_UNSPEC;
>> +	}
>> +
>>   	return a;
>
>
>I think it would make a lot more sense to just reject the entry than
>changing it underneath the user to a default value. Least element of
>suprise.

It might break existing user who is incorrectly doing it. But I'm okay
with both solutions.

>
>cheers,
>jamal