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Date: Thu, 14 Aug 2014 11:37:53 -0700
Message-ID: <CAHA+R7MLQtYF5vBN0D66Wk8iyGZABf5=Az293gUH6w=4THv8Gw@mail.gmail.com>
Subject: Re: network interfaces called "all", "default" or "config"
From: Cong Wang <cwang@twopensource.com>
To: Stephane Chazelas <stephane.chazelas@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>
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On Thu, Aug 14, 2014 at 2:41 AM, Stephane Chazelas
<stephane.chazelas@gmail.com> wrote:
> By the way, this is related:
>
> $ ip link add link eth0 eth0:123 type vlan id 123
> $ ip link del link eth0 eth0:123
> RTNETLINK answers: Operation not supported

Kernel reads "eth0:123" as an alias of "eth0", so it will just
truncate the dev name into "eth0":


        ifr.ifr_name[IFNAMSIZ-1] = 0;

        colon = strchr(ifr.ifr_name, ':');
        if (colon)
                *colon = 0;