netdev - Re: [PATCH net] net: Disallow providing non zero VLAN ID for NIC drivers FDB add flow

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Message-ID: <20141214223354.GA2035@nanopsycho.orion>
Date:	Sun, 14 Dec 2014 23:33:54 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Or Gerlitz <ogerlitz@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.r.fastabend@...el.com>
Subject: Re: [PATCH net] net: Disallow providing non zero VLAN ID for NIC
 drivers FDB add flow

Sun, Dec 14, 2014 at 09:14:27PM CET, gerlitz.or@...il.com wrote:
>On Sun, Dec 14, 2014 at 9:23 PM, Jiri Pirko <jiri@...nulli.us> wrote:
>> Sun, Dec 14, 2014 at 05:19:05PM CET, ogerlitz@...lanox.com wrote:
>>>The current implementations all use dev_uc_add_excl() and such whose API
>>>doesn't support vlans, so we can't make it with NICs HW for now.
>>>
>>>Fixes: f6f6424ba773 ('net: make vid as a parameter for ndo_fdb_add/ndo_fdb_del')
>>
>> Maybe I'm missing something, but this commit did not introduce the
>> problem.
>
>This commit introduced the vid param to ndo_fdb_add and ndo_dflt_fdb_add
>which further call the dev_uc_add APIs... so it did introduced the
>ability to provide VID into these APIs, right? and we want to protect
>against anyone using this ability @ this point.

That is in-kernel change. Vs. usespace the patch is a no-op. If userspace
fills up NDA_VLAN, it is ignored before the patch as well as after. No
behaviour change, just +- cosmetics.

>
>> If was there already before when NDA_VLAN was set and ignored.
>> But other than this. I like the patch
>>
>> Reviewed-by: Jiri Pirko <jiri@...nulli.us>
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