linux-kernel - Re: the patch "bridge: export multicast database via netlink" broke kernel 3.8 uapi

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Message-ID: <50F53596.4070200@mageia.org>
Date:	Tue, 15 Jan 2013 12:55:18 +0200
From:	Thomas Backlund <tmb@...eia.org>
To:	Cong Wang <amwang@...hat.com>
CC:	Thomas Backlund <tmb@...eia.org>, Eric Blake <eblake@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	libvirt-list@...hat.com, tgraf@...g.ch
Subject: Re: the patch "bridge: export multicast database via netlink" broke
 kernel 3.8 uapi

Cong Wang skrev 15.1.2013 12:11:
> On Tue, 2013-01-15 at 12:03 +0200, Thomas Backlund wrote:
>> Eric Blake skrev 15.1.2013 01:57:
>>> On 01/13/2013 01:05 PM, Thomas Backlund wrote:
>>>> Thomas Backlund skrev 13.1.2013 20:38:
>>>>> patch both inline and attached as thunderbird tends to mess up ...
>>>>
>>>>> -----
>>>>>
>>>>> if_bridge.h uses struct in6_addr ip6; but does not include the in6.h
>>>>> header.
>>>>>
>>>>> Found by trying to build libvirt and connman against 3.8-rc3 headers.
>>>>>
>>>>
>>>> Ok,
>>>> ignore this patch, it's not the correct fix as it introduces
>>>> redefinitions...
>>>>
>>>> Btw, the error that I hit that made me suggest this fix was libvirt
>>>> config check bailing out:
>>>>
>>>> config.log:/usr/include/linux/if_bridge.h:173:20: error: field 'ip6' has
>>>> incomplete type
>>>
>>> Hmm, just now noticing this thread, after independently hitting and and
>>> having to work around the same problem in libvirt:
>>> https://www.redhat.com/archives/libvir-list/2013-January/msg00930.html
>>> https://bugzilla.redhat.com/show_bug.cgi?id=895141
>>
>>
>> Yep,
>>
>> and the commit breaking uapi headers is by using "struct in6_addr ip6" is:
>>
>>
>>   From ee07c6e7a6f8a25c18f0a6b18152fbd7499245f6 Mon Sep 17 00:00:00 2001
>> From: Cong Wang <amwang@...hat.com>
>> Date: Fri, 7 Dec 2012 00:04:48 +0000
>> Subject: [PATCH] bridge: export multicast database via netlink
>
> Does the following patch help?
>
> $ git diff include/uapi/linux/if_bridge.h
> diff --git a/include/uapi/linux/if_bridge.h
> b/include/uapi/linux/if_bridge.h
> index 5db2975..653db23 100644
> --- a/include/uapi/linux/if_bridge.h
> +++ b/include/uapi/linux/if_bridge.h
> @@ -14,6 +14,7 @@
>   #define _UAPI_LINUX_IF_BRIDGE_H
>
>   #include <linux/types.h>
> +#include <linux/in6.h>
>
>   #define SYSFS_BRIDGE_ATTR      "bridge"
>   #define SYSFS_BRIDGE_FDB       "brforward"
>

Well, I suggested the same fix in the beginning of the thread
on netdev and lkml: "if_bridge.h: include in6.h for struct in6_addr use"

as it seemed to fix the libvirt case

but then asked it to be ignored after I tried to build connman,
and hit this conflict with glibc-2.17:

In file included from /usr/include/arpa/inet.h:22:0,
                  from ./include/connman/inet.h:25,
                  from src/connman.h:128,
                  from src/tethering.c:40:
/usr/include/netinet/in.h:35:5: error: expected identifier before 
numeric constant
/usr/include/netinet/in.h:197:8: error: redefinition of 'struct in6_addr'
In file included from /usr/include/linux/if_bridge.h:17:0,
                  from src/tethering.c:38:
/usr/include/linux/in6.h:30:8: note: originally defined here
In file included from /usr/include/arpa/inet.h:22:0,
                  from ./include/connman/inet.h:25,
                  from src/connman.h:128,
                  from src/tethering.c:40:
/usr/include/netinet/in.h:238:8: error: redefinition of 'struct 
sockaddr_in6'
In file included from /usr/include/linux/if_bridge.h:17:0,
                  from src/tethering.c:38:
/usr/include/linux/in6.h:46:8: note: originally defined here
In file included from /usr/include/arpa/inet.h:22:0,
                  from ./include/connman/inet.h:25,
                  from src/connman.h:128,
                  from src/tethering.c:40:
/usr/include/netinet/in.h:274:8: error: redefinition of 'struct ipv6_mreq'
In file included from /usr/include/linux/if_bridge.h:17:0,
                  from src/tethering.c:38:
/usr/include/linux/in6.h:54:8: note: originally defined here
make[1]: *** [src/src_connmand-tethering.o] Error 1


So I'm not sure it's the right one...


--
Thomas

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