netdev - Re: [NETFILTER]: Introduce nf_inet

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Date:	Tue, 19 Feb 2008 23:30:47 +0900
From:	David Woodhouse <dwmw2@...radead.org>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org, Jan Engelhardt <jengelh@...putergmbh.de>,
	"David S. Miller" <davem@...emloft.net>, varekova@...hat.com
Subject: Re: [NETFILTER]: Introduce nf_inet_address

On Tue, 2008-02-19 at 15:01 +0100, Patrick McHardy wrote:
> David Woodhouse wrote:
> >> +union nf_inet_addr {
> >> +	u_int32_t	all[4];
> >> +	__be32		ip;
> >> +	__be32		ip6[4];
> >> +};
> >> +
> >>  #ifdef __KERNEL__
> >>  #ifdef CONFIG_NETFILTER
> > 
> > This breaks the busybox build:
> > 
> > CC      ipsvd/tcpudp.o
> > In file included from /usr/include/linux/netfilter_ipv4.h:8,
> >                  from ipsvd/tcpudp.c:33:
> > /usr/include/linux/netfilter.h:40: error: expected specifier-qualifier-list before 'u_int32_t'
> > 
> > What is this 'u_int32_t' nonsense anyway?
> > 
> > If a user-visible header is likely to be included by libc directly from
> > a 'standard' header, it may not require <stdint.h>. Therefore it should
> > use the system-specific types such as '__u32'.
> 
> Right, I queued this patch to fix it.

That does the trick -- but are we using u_int32_t elsewhere in
user-visible headers? Does it work there? How?

> > A later commit adds struct in_addr and struct in6_addr to this union
> > too, which breaks busybox even harder.
> 
> Thats odd, the iptables headers have always used struct in_addr and
> struct in6_addr in struct ipt_ip/struct ip6t_ip6, which are also
> used by userspace. What is "ipsvd/tcpudp.c"? I couldn't find it in
> the Debian busybox source.

It's in busybox 1.9.1. Just including <netinet/in.h> seems to be
sufficient to make it happy again. I wonder if netfilter.h should
include that for itself?

-- 
dwmw2

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