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 14:36:05 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>,
        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 02:30:42PM CEST, pabeni@...hat.com wrote:
>Currently, when initializing an action, the user-space can specify
>and use arbitrary values for the tcfa_action field. If the value
>is unknown by the kernel, is implicitly threaded as TC_ACT_UNSPEC.
>
>This change explicitly checks for unknown values at action creation
>time, and explicitly convert them to TC_ACT_UNSPEC. No functional
>changes are introduced, but this will allow introducing tcfa_action
>values not exposed to user-space in a later patch.
>
>Note: we can't use the above to hide TC_ACT_REDIRECT from user-space,
>as the latter is already part of uAPI.
>
>v3 -> v4:
> - use an helper to check for action validity (JiriP)
> - emit an extack for invalid actions (JiriP)
>v4 -> v5:
> - keep messages on a single line, drop net_warn (Marcelo)

Little nitpick: The changelog should be in the reverse order.

>
>Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Acked-by: Jiri Pirko <jiri@...lanox.com>