netdev - Re: new link failing on duplicate names in different namespaces

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Message-ID: <54EDF7BB.2060809@6wind.com>
Date:	Wed, 25 Feb 2015 17:26:35 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Eugene Yakubovich <eugene.yakubovich@...eos.com>,
	netdev@...r.kernel.org, "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: new link failing on duplicate names in different namespaces

Le 25/02/2015 01:48, Eugene Yakubovich a écrit :
> Hello,
>
> rtnetlink's RTM_NEWLINK allows for specifying the network namespace in
> which the link is to be created via IFLA_NET_NS_PID or IFLA_NET_NS_FD.
> This not only saves a user a call to move the link into the target
> namespace, it can avoid a potential ifname conflict. For example, if
> creating eth0 in another namespace and the current one already has
> eth0.
>
> Unfortunately, this is not the current behavior. If the user specifies
> IFLA_IFNAME, leaves ifinfomsg.ifi_index unspecified and sets
> NLM_F_EXCL flag, as in the case of creating a new link, the call will
> fail with EEXIST in cases where there's a name conflict.
>
> rtnl_newlink() will:
>
> if (ifname[0])
>      dev = __dev_get_by_name(net, ifname);
Yes, it seems that this should be done in "dest_net" or "link_net".
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