netdev - Re: Redefinition of struct in6_addr in <netinet/in.h> and <linux/in6.h>

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Date:	Wed, 16 Jan 2013 23:21:21 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.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,
	David Miller <davem@...emloft.net>, libc-alpha@...rceware.org,
	schwab@...e.de, carlos@...temhalted.org,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: Redefinition of struct in6_addr in <netinet/in.h> and <linux/in6.h>

Cong Wang wrote:
> (Cc'ing some glibc developers...)
> 
> Hello,
> 
> In glibc source file inet/netinet/in.h and kernel source file
> include/uapi/linux/in6.h, both define struct in6_addr, and both are
> visible to user applications. Thomas reported a conflict below.
> 
> So, how can we handle this? /me is wondering why we didn't see this
> before.
> 
> Thanks.
> 
> On Tue, 2013-01-15 at 12:55 +0200, Thomas Backlund wrote:
>> Cong Wang skrev 15.1.2013 12:11:
>>>
>>> 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...

This is not a new issue.  In addition to this,
netinet/in.h also conflits with linux/in.h.

We might have
 #if !defined(__GLIBC__) || !defined(_NETINET_IN_H)
 :
 #endif
around those conflicting definitions in uapi/linux/in{,6}.h.

--yoshfuji
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