netdev - Re: [PATCH] bridge: netlink: check vlan_default

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Date:   Mon, 15 May 2017 16:29:57 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Tobias Jungel <tobias.jungel@...dn.de>,
        Sabrina Dubroca <sd@...asysnail.net>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] bridge: netlink: check vlan_default_pvid range

On 5/15/17 4:21 PM, Tobias Jungel wrote:
> Thanks Sabrina and Nik.
> 
> On Mon, 2017-05-15 at 14:01 +0200, Sabrina Dubroca wrote:
>> Hi Tobias,
>>
>> 2017-05-15, 13:08:19 +0200, Tobias Jungel wrote:
>>> Currently it is allowed to set the default pvid of a bridge to a
>>> value
>>> above VLAN_VID_MASK (0xfff). This patch checks the passed pvid and
>>> disables the pvid in case it is out of bounds.
>>
>> Could we return an error (-EINVAL) to userspace instead?  Silently
>> disabling the feature seems confusing to me.  This would probably be
>> better in br_validate() (like the IFLA_BR_VLAN_PROTOCOL check), since
>> there's already such a check when setting default_pvid from sysfs (in
>> br_vlan_set_default_pvid()).
> 
> I will send a v2 that returns -EINVAL. br_validate seems to be the
> wrong place to me since it deals with the bridge ports.
> 

Could you elaborate ? br_validate should be called for all and is a very good
suggestion.

>>
>>>
>>> Reproduce by calling:
>>>
>>> [root@...t ~]# ip l a type bridge
>>> [root@...t ~]# ip l a type dummy
>>> [root@...t ~]# ip l s bridge0 type bridge vlan_filtering 1
>>> [root@...t ~]# ip l s bridge0 type bridge vlan_default_pvid 9999
>>> [root@...t ~]# ip l s dummy0 master bridge0
>>> [root@...t ~]# bridge vlan
>>> port	vlan ids
>>> bridge0	 9999 PVID Egress Untagged
>>>
>>> dummy0	 9999 PVID Egress Untagged
>>
>> You'll also need to add a Signed-off-by, and a Fixes tag would be
>> nice.
>>
> 
> Right, will add this as well.
> 
>>
>> Thanks,
>>