netdev - Re: header conflict introduced by change to netfilter_ipv4/ip

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Date:	Fri, 26 Feb 2016 09:18:17 +0200
From:	Mikko Rapeli <mikko.rapeli@....fi>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Stephen Hemminger <shemming@...cade.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: header conflict introduced by change to
 netfilter_ipv4/ip_tables.h

On Thu, Feb 25, 2016 at 10:08:56PM +0100, Thomas Graf wrote:
> On 01/06/16 at 09:20am, Stephen Hemminger wrote:
> > This commit breaks compilation of iproute2 with net-next.
> > 
> > commit 1ffad83dffd675cd742286ae82dca7d746cb0da8
> > Author: Mikko Rapeli <mikko.rapeli@....fi>
> > Date:   Thu Oct 15 07:56:30 2015 +0200
> > 
> >     netfilter: fix include files for compilation
> >     
> >     Add missing header dependencies and other small changes so that each file
> >     compiles alone in userspace.
> >     
> >     Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
> >     Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> > 
> > For iproute2, a copy of kernel headers (from make install_headers) is used.
> > After this change. the build of x_tables.c fails because IFNAMSIZ is already
> > defined in net/if.h
> 
> There is another issue with this commit. iptables.h included from m_ipt.c
> includes  xtables.h which includes <xtables-version.h> which is not
> available on a system without xtables.
> 
> gcc -Wall -Wstrict-prototypes  -Wmissing-prototypes -Wmissing-declarations -Wold-style-definition -Wformat=2 -O2 -I../include -DRESOLVE_HOSTNAMES -DLIBDIR=\"/usr/lib\" -DCONFDIR=\"/etc/iproute2\" -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE  -DHAVE_SETNS -DHAVE_ELF -DCONFIG_GACT -DCONFIG_GACT_PROB -DIPT_LIB_DIR=\"/lib/xtables\" -DYY_NO_INPUT   -c -o m_ipt.o m_ipt.c
> In file included from ../include/iptables.h:5:0,
>                  from m_ipt.c:17:
> ../include/xtables.h:34:29: fatal error: xtables-version.h: No such file or directory
>  #include <xtables-version.h>

I don't see any dependencies from kernel side uapi headers to iptables or
xtables in my tree based on v4.5-rc2. Maybe this is a problem in
iproute2.

-Mikko