netdev - Re: inbound connection problems when "netlink: test for all flags of the NLM_F

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Date:	Wed, 19 Jan 2011 15:53:17 +0100
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	David Miller <davem@...emloft.net>, arthur.marsh@...ernode.on.net,
	jengelh@...ozas.de, eric.dumazet@...il.com, netdev@...r.kernel.org,
	hadi@...erus.ca
Subject: Re: inbound connection problems when "netlink: test for all flags
 of the NLM_F_DUMP composite" commit applied

On 18/01/11 22:14, Jarek Poplawski wrote:
> On Tue, Jan 18, 2011 at 09:31:31PM +0100, Pablo Neira Ayuso wrote:
>> On 18/01/11 11:24, Jarek Poplawski wrote:
>>> On Tue, Jan 18, 2011 at 02:07:02AM -0800, David Miller wrote:
>>>> From: Jarek Poplawski <jarkao2@...il.com>
>>>> Date: Tue, 18 Jan 2011 09:38:11 +0000
>>>>
>>>>> Even if I'm wrong, this change added to stable will break many configs.
>>>>> My proposal is to revert commit 0ab03c2b147 until proper fix is found.
>>>>
>>>> The flag combination is, at best ambiguous, it has no proper
>>>> definition without the check we added.
>>>
>>> Do you all expect all users manage to upgrade avahi app before
>>> changing their stable kernel? I mean "own distro" users especially.
>>
>> The combination that avahi uses makes no sense.
>>
>> I've been auditing user-space tools that may have problems with this change:
>>
>> * iw (it uses libnl)
>> * acpid (it uses a mangled version of libnetlink shipped in iproute)
>> * tstime, for taskstats, it uses libnl
>> * wimax-tools, it uses libnl
>> * quota-tools, it uses libnl
>> * keepalived, no libs used
>>
>> Well, I can keep looking for more, but I think that avahi is the only
>> one doing this incorrectly.
> 
> BTW, could you answer my earlier question, why NLM_F_ATOMIC flag isn't
> handled now with dumps?

The NLM_F_ATOMIC flag is not affected, the netlink header is still
passed to netlink_dump_start() so you can check for it in the callback
to start an atomic dump.
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