netdev - Re: [PATCH net 1/1 v1] rtnetlink: require unique netns identifier

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Date:   Sun, 4 Feb 2018 10:21:50 -0700
From:   David Ahern <dsahern@...il.com>
To:     Christian Brauner <christian.brauner@...onical.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        netdev@...r.kernel.org, ebiederm@...ssion.com, jbenc@...hat.com,
        nicolas.dichtel@...nd.com, linux-kernel@...r.kernel.org,
        davem@...emloft.net
Subject: Re: [PATCH net 1/1 v1] rtnetlink: require unique netns identifier

On 2/4/18 5:11 AM, Christian Brauner wrote:
> On Sat, Feb 03, 2018 at 11:17:01AM -0800, Stephen Hemminger wrote:
>> On Sat,  3 Feb 2018 14:29:04 +0100
>> Christian Brauner <christian.brauner@...ntu.com> wrote:
>>
>>> +static int rtnl_ensure_unique_netns_attr(const struct sock *sk,
>>> +					 struct nlattr *tb[],
>>> +					 struct netlink_ext_ack *extack)
>>> +{
>>> +	int ret = -EINVAL;
>>> +	struct net *net = NULL, *unique_net = NULL;
>>> +
>>> +	/* Requests without network namespace ids have been able to specify
>>> +	 * multiple properties referring to different network namespaces so
>>> +	 * don't regress them.
>>> +	 */
>>> +	if (!tb[IFLA_IF_NETNSID])
>>> +		return 0;
>>> +
>>> +	if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD])
>>> +		return 0;
>>
>> Isn't this an error?
> 
> My reasoning was that having no explicit network namespace identifying
> attributes the caller operates on the current network namespace which is
> uniquely identified.

agreed. those are not required attributes.