netdev - Re: [PATCH net v3] net: enable interface alias removal via rtnl

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Date:   Mon, 16 Oct 2017 20:52:57 +0100 (WEST)
From:   David Miller <davem@...emloft.net>
To:     nicolas.dichtel@...nd.com
Cc:     dsahern@...il.com, netdev@...r.kernel.org, oliver@...tkopp.net,
        stephen@...workplumber.org
Subject: Re: [PATCH net v3] net: enable interface alias removal via rtnl

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Date: Wed, 11 Oct 2017 16:24:48 +0200

> IFLA_IFALIAS is defined as NLA_STRING. It means that the minimal length of
> the attribute is 1 ("\0"). However, to remove an alias, the attribute
> length must be 0 (see dev_set_alias()).
> 
> Let's define the type to NLA_BINARY to allow 0-length string, so that the
> alias can be removed.
> 
> Example:
> $ ip l s dummy0 alias foo
> $ ip l l dev dummy0
> 5: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
>     link/ether ae:20:30:4f:a7:f3 brd ff:ff:ff:ff:ff:ff
>     alias foo
> 
> Before the patch:
> $ ip l s dummy0 alias ""
> RTNETLINK answers: Numerical result out of range
> 
> After the patch:
> $ ip l s dummy0 alias ""
> $ ip l l dev dummy0
> 5: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
>     link/ether ae:20:30:4f:a7:f3 brd ff:ff:ff:ff:ff:ff
> 
> CC: Oliver Hartkopp <oliver@...tkopp.net>
> CC: Stephen Hemminger <stephen@...workplumber.org>
> Fixes: 96ca4a2cc145 ("net: remove ifalias on empty given alias")
> Reported-by: Julien FLoret <julien.floret@...nd.com>
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>

Applied, thank you.