Re: [PATCH iproute2] ip-address: properly display zero IPv4 peer address

On Thu, 22 Oct 2015 10:34:28 +0200
Thomas Haller [off-list ref] wrote:

Kernel allows for zero IPv4 peer addresses (IFA_ADDRESS):

   ip address add 192.168.5.1 peer 0.0.0.0/24 dev dummy

which is distinct from a usual address like:

   ip address add 192.168.5.1/24 dev dummy
   ip address add 192.168.5.1 peer 192.168.5.1/24 dev dummy

For IPv4, a missing IFA_ADDRESS attribute means that the peer
is 0.0.0.0. See inet_fill_ifaddr(), which does:

  if ((ifa->ifa_address &&
       nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||

Signed-off-by: Thomas Haller <redacted>

I would prefer that this apply to both IPv4 and IPv6.
If the kernel sends back an address, then display it.