linux-kernel - Re: Redefinition of struct in6_addr in <netinet/in.h> and <linux/in6.h>

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Message-ID: <alpine.LNX.2.01.1301171153540.15372@nerf07.vanv.qr>
Date:	Thu, 17 Jan 2013 11:57:14 +0100 (CET)
From:	Jan Engelhardt <jengelh@...i.de>
To:	David Miller <davem@...emloft.net>
cc:	carlos@...temhalted.org, bhutchings@...arflare.com,
	yoshfuji@...ux-ipv6.org, amwang@...hat.com, tmb@...eia.org,
	eblake@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, libvirt-list@...hat.com,
	tgraf@...g.ch, libc-alpha@...rceware.org, schwab@...e.de
Subject: Re: Redefinition of struct in6_addr in <netinet/in.h> and
 <linux/in6.h>

On Thursday 2013-01-17 03:05, David Miller wrote:

>From: Carlos O'Donell <carlos@...temhalted.org>
>Date: Wed, 16 Jan 2013 20:58:47 -0500
>
>> So I just went down the rabbit hole, and the further I get the
>> closer I get to having two exact copies of the same definitions
>> in both glibc and the kernel and using whichever one was included
>> first.
>> 
>> Is anyone opposed to that kind of solution?
>
>Sounds interesting, please share :-)

iptables has the same issue, and solved it its way. 
(uapi/)linux/netfilter.h is used to get at things like union 
nf_inet_addr. This union contains struct in6_addr. There is no include 
for in6_addr in netfilter.h itself. This may break the "standalone 
compilation" test, but at least allows for specifying the 
environment-specific header for in6_addr in the C file:

a. userspace: #include <netinet/in.h> before <linux/netfilter.h>
b. kernel parts: #include <linux/in6.h> before <linux/netfilter.h>
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