netdev - Re: [PATCH net] uapi: fix compatability of linux/in.h with netinet/in.h

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Date:	Mon, 29 Jun 2015 14:55:48 -1000
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net] uapi: fix compatability of linux/in.h with
 netinet/in.h

On Mon, 29 Jun 2015 20:07:20 +0200
Pablo Neira Ayuso <pablo@...filter.org> wrote:

> 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 <pablo@...filter.org>
> >    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.

The problem is that your patch changes include/uapi/linux/netfilter.h
to include linux/in.h. Some programs have already include <netinet/in.h>
(often through a complex chain of headers).
If both headers are included it causes errors and warnings about duplicate
definitions. My patch fixes that.
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