linux-kernel - Re: [PATCH v5] net: ip, diag -- Add diag interface for raw sockets

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Date:   Wed, 28 Sep 2016 08:38:26 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     David Miller <davem@...emloft.net>
Cc:     gorcunov@...il.com, eric.dumazet@...il.com,
        dsa@...ulusnetworks.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
        jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
        avagin@...nvz.org, stephen@...workplumber.org
Subject: Re: [PATCH v5] net: ip, diag -- Add diag interface for raw sockets

On 16-09-28 08:27 AM, Jamal Hadi Salim wrote:
> On 16-09-28 08:16 AM, David Miller wrote:
>> From: Jamal Hadi Salim <jhs@...atatu.com>
>> Date: Wed, 28 Sep 2016 08:09:28 -0400
>>
>>> On 16-09-28 08:07 AM, David Miller wrote:
>>>
>>>> Right, it would be legal for an existing user to have code that
>>>> explicitly initializes every member of the structure, including 'pad'.
>>>> So we have to keep that member around, at a minimum, for their sake.
>>>>
>>>
>>> I think we need to start labelling any new pad fields added as
>>> "Not UAPI. Do not fsck fondle this".
>>
>> They must initialize it to zero.
>>
>
> What if in the future actually meant to use 0 for
> something?;-> For example in Cyrill's case it means PROTO_IP
> Not sure if it useful to interpret or not but it is part of the
> enum for protocols.

I just tested with: socket(AF_INET, SOCK_RAW, 0);

and got back: EPROTONOSUPPORT

So in this case doesnt matter. But my point stands i.e 0 could mean
something.

cheers,
jamal