netdev - Re: [PATCH 1/6] bridge: add support to parse multiple vlan info attributes in IFLA_AF

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Date:	Mon, 29 Dec 2014 14:10:31 -0800
From:	roopa <roopa@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.com>
CC:	Netdev <netdev@...r.kernel.org>, shemminger@...tta.com,
	"vyasevic@...hat.com" <vyasevic@...hat.com>,
	Wilson Kok <wkok@...ulusnetworks.com>
Subject: Re: [PATCH 1/6] bridge: add support to parse multiple vlan info attributes
 in IFLA_AF_SPEC

On 12/29/14, 1:40 PM, Scott Feldman wrote:
> On Mon, Dec 29, 2014 at 1:05 PM,  <roopa@...ulusnetworks.com> wrote:
>> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>>
>> This patch changes bridge IFLA_AF_SPEC netlink attribute parser to
>> look for more than one IFLA_BRIDGE_VLAN_INFO attribute. This allows
>> userspace to pack more than one vlan in the setlink msg.
>>
>> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
>> ---
>>   net/bridge/br_netlink.c |   18 +++++++++---------
>>   1 file changed, 9 insertions(+), 9 deletions(-)
>>
>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>> index 9f5eb55..75971b1 100644
>> --- a/net/bridge/br_netlink.c
>> +++ b/net/bridge/br_netlink.c
>> @@ -230,18 +230,18 @@ static int br_afspec(struct net_bridge *br,
>>                       struct nlattr *af_spec,
>>                       int cmd)
>>   {
>> -       struct nlattr *tb[IFLA_BRIDGE_MAX+1];
>> +       struct bridge_vlan_info *vinfo;
>>          int err = 0;
>> +       struct nlattr *attr;
>> +       int err = 0;
>> +       int rem;
>> +       u16 vid;
>>
>> -       err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
> Removing this call orphans ifla_br_policy...should ifla_br_policy be removed?

good question. Its a good place to see the type. In-fact userspace 
programs also copy the same policy to parse netlink attributes. hmmm..
I would like to keep it if it does not throw a warning.
>
>> -       if (err)
>> -               return err;
>> -
>> -       if (tb[IFLA_BRIDGE_VLAN_INFO]) {
>> -               struct bridge_vlan_info *vinfo;
>> -
>> -               vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
>> +       nla_for_each_nested(attr, af_spec, rem) {
>> +               if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
>> +                       continue;
> Need to validate size of attr is sizeof(struct bridge_vlan_info).

ack, will fix.
>
>> +               vinfo = nla_data(attr);
>>                  if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
>>                          return -EINVAL;
>>
>> --
>> 1.7.10.4
>>
>> --
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