netdev - Re: [PATCH 2/4] mac80211: set NET_NAME_USER for user-space created ifs

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Message-ID: <1393517912.4648.5.camel@jlt4.sipsolutions.net>
Date:	Thu, 27 Feb 2014 17:18:32 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	David Herrmann <dh.herrmann@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Kay Sievers <kay.sievers@...y.org>,
	Tom Gundersen <teg@...m.no>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: Re: [PATCH 2/4] mac80211: set NET_NAME_USER for user-space created
 ifs

On Thu, 2014-02-27 at 15:56 +0100, David Herrmann wrote:

> >> +++ b/net/mac80211/iface.c
> >> @@ -1620,6 +1620,7 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
> >>                                       + IEEE80211_ENCRYPT_HEADROOM;
> >>               ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
> >>
> >> +             ndev->name_assign_type = NET_NAME_USER;
> >
> > this is wrong because we call this in main.c with a "wlan%d" argument
> > for the name, which gets expanded.
> 
> Whoops, yeah, same issue as with ath6kl where I fixed it with a
> separate "name_assign_type" argument. I will do the same here for v2.

I'm not sure that helps - the user could potentially pass "foobar%d" as
the interface name and get a number assigned by the kernel. In that case
you probably *don't* want to set it to "name assigned by user"?

Maybe this whole thing can just be handled in __dev_alloc_name() since
no kernel user should pass just a string without "%d" in it.

johannes

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