From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [PATCH] veth: Showing peer of veth type dev in ip link (kernel
 side)
Date: Fri, 4 Oct 2013 10:55:49 -0700
Message-ID: <20131004105549.36184810@nehalam.linuxnetplumber.net>
References: <1380859529-32351-1-git-send-email-yamato@redhat.com>
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Cc: netdev@vger.kernel.org
To: Masatake YAMATO <yamato@redhat.com>
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On Fri,  4 Oct 2013 13:05:29 +0900
Masatake YAMATO <yamato@redhat.com> wrote:

> ip link has ability to show extra information of net work device if
> kernel provides sunh information. With this patch veth driver can
> provide its peer ifindex information to ip command via netlink
> interface.
> 
> Signed-off-by: Masatake YAMATO <yamato@redhat.com>
> ---

netlink API's are supposed to be symmetrical.

When creating veth, the VETH_INFO_PEER attribute is struct(ifinfomsg).
The fill_info should tack on the same data.