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

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Date:	Fri, 30 Jan 2009 05:12:32 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	David Miller <davem@...emloft.net>
cc:	sam@...nborg.org, 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


On Wednesday 2009-01-28 21:29, David Miller wrote:
>> On Tuesday 2009-01-27 06:08, David Miller wrote:
>> >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.
>> 
>> I think in the long term, exported structs should probably
>> have a "kernel_" prefix, much like userspace libraries use
>> such prefixes to (try to) guard against simple name clashes.
>
>This is a reasonable rule for future interfaces, but won't
>help us here on this one.[...]
>Really, we page a huge price these days because the relationship
>between glibc's and the kernel's userland header exports in the
>past has been anti-social at best.
>
Yeah I just had to notice >:-(

IPPROTO_MH is only defined in linux/in6.h, but inclusion of it:

/usr/include/linux/in6.h:31: error: redefinition of ■struct in6_addr■
/usr/include/linux/in6.h:52: error: redefinition of ■struct sockaddr_in6■
/usr/include/linux/in6.h:60: error: redefinition of ■struct ipv6_mreq■

Ick. That's even worse than tunnels.
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