netdev - Re: [iproute PATCH] ip-link: Fix listing of alias interfaces

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Date:   Fri, 8 Feb 2019 09:56:47 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Phil Sutter <phil@....cc>
Cc:     netdev@...r.kernel.org, Roopa Prabhu <roopa@...ulusnetworks.com>
Subject: Re: [iproute PATCH] ip-link: Fix listing of alias interfaces

On Thu,  7 Feb 2019 14:05:27 +0100
Phil Sutter <phil@....cc> wrote:

> Commit 50b9950dd9011 ("link dump filter") accidentally broke listing of
> links in the old alias interface notation:
> 
> | % ip link show eth0:1
> | RTNETLINK answers: No such device
> | Cannot send link get request: No such device
> 
> Prior to the above commit, link lookup was performed via ifindex
> returned by if_nametoindex(). The latter uses SIOCGIFINDEX ioctl call
> which on kernel side causes the colon-suffix to be dropped before doing
> the interface lookup. Netlink API though doesn't care about that at all.
> To keep things backward compatible, mimick ioctl API behaviour and drop
> the colon-suffix prior to sending the RTM_GETLINK request.
> 
> Fixes: 50b9950dd9011 ("link dump filter")
> Signed-off-by: Phil Sutter <phil@....cc>

It is a regression, but the original code was kind of broken.
iproute2 doesn't need or want the old style alias interface notation.