netdev - Re: 2.6.28 headers break kbd and net-tools userspace builds

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Date:	Mon, 26 Jan 2009 21:08:35 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sam@...nborg.org
Cc:	andrew@...rond.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 2.6.28 headers break kbd and net-tools userspace builds

From: Sam Ravnborg <sam@...nborg.org>
Date: Thu, 22 Jan 2009 20:12:39 +0100

> On Thu, Jan 22, 2009 at 07:03:29PM +0000, Andrew Walrond wrote:
> > $ grep -r iphdr /usr/include/
> > 
> > /usr/include/netinet/ip.h:struct iphdr
> > /usr/include/netinet/tcp.h: * This should be defined as MIN(512, IP_MSS 
> > - sizeof (struct tcpiphdr)).
> > /usr/include/linux/if_tunnel.h:    struct iphdr        iph;
> > /usr/include/linux/ip.h:struct iphdr {
> > 
> > $ grep netinet/ip.h iptunnel.c
> > 
> > #include <netinet/ip.h>
> > 
> > So linux/ip.h is clashing with glibc(2.8)'s netinet/ip.h
> 
> I took a look at my netinet/ip.h and this is obviously
> the same structure.
> But I do not know what the right answer is here.
> 
> Added netdev..
> 
> This may be a general thing. Because iphdr is
> no a kernel thing, it is an IP thing. So one could argue
> that the kernel should not export it in the first place.

The fly in the ointment is linux/if_tunnel.h

We export a structure there for a userland interface which
uses "struct iphdr".

Because of that, we are faced with the difficult choice between
defining the structure (as we do) in linux/ip.h or using some ugly
__KERNEL__ ifdefs in linux/if_tunnel.h to conditionally include
netinet/ip.h instead. :-/

Really, I have no idea what to do about this as the problem has
existed for so long.
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