netdev - Re: [PATCH 2/7] mark root hnode explicitly

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Message-ID: <5689c19a-c4fb-24c1-4594-86f2639faa98@mojatatu.com>
Date:   Thu, 6 Sep 2018 06:34:00 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Al Viro <viro@...IV.linux.org.uk>, netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH 2/7] mark root hnode explicitly

On 2018-09-06 6:28 a.m., Jamal Hadi Salim wrote:
> On 2018-09-05 3:04 p.m., Al Viro wrote:
>> From: Al Viro <viro@...iv.linux.org.uk>
>>
>> ... and disallow deleting or linking to such
>>
>> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> 
> Same comment as other one in regards to subject
> 
> Since the flag space is coming from htnode which is
> exposed via uapi it makes sense to keep this one here
> because it is for private use; but  a comment in
> include/uapi/linux/pkt_cls.h that this flag or
> maybe a set of bits is reserved for internal use.
> Otherwise:
> 
> Acked-by: Jamal Hadi Salim <jhs@...atatu.com>


Sorry, additional comment:
It makes sense to reject user space attempt to
set TCA_CLS_FLAGS_U32_ROOT
So my suggestion is to update tc_flags_valid() to
check for this.

cheers,
jamal