netdev - Re: Default network namespace name

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Date:	Wed, 21 May 2014 10:29:47 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Peter Fassberg <pf@...ssner.se>
Cc:	Rami Rosen <roszenrami@...il.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: Default network namespace name

On Wed, May 21, 2014 at 10:21 AM, Peter Fassberg <pf@...ssner.se> wrote:
>
> How does "ip link set" distinguish between PID 1 and a namespace named "1"?

Looking at the code, it just checks if it's name "1" first, then
checks if it's a PID:

                        if ((netns = get_netns_fd(*argv)) >= 0)
                                addattr_l(&req->n, sizeof(*req),
IFLA_NET_NS_FD, &netns, 4);
                        else if (get_integer(&netns, *argv, 0) == 0)
                                addattr_l(&req->n, sizeof(*req),
IFLA_NET_NS_PID, &netns, 4);
                        else
                                invarg("Invalid \"netns\" value\n", *argv);
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