On Thu, Jun 25, 2015 at 11:12:06PM -0400, Stephen Hemminger wrote:

This fixes breakage to iproute2 build with recent kernel headers
caused by:
   commit a263653ed798216c0069922d7b5237ca49436007
   Author: Pablo Neira Ayuso [off-list ref]
   Date:   Wed Jun 17 10:28:27 2015 -0500

   netfilter: don't pull include/linux/netfilter.h from netns headers

The issue is that definitions in linux/in.h overlap with those
in netinet/in.h. This patch solves this by introducing the same
mechanism as was used to solve the same problem with linux/in6.h

My patch also modifies non-exposed net/netns/ headers, I'm not sure
how this can be causing problems to uapi headers.