netdev - Re: [PATCH net-2.6.26] netlink: make socket filters work on netlink

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Message-ID: <47F37615.1090502@trash.net>
Date:	Wed, 02 Apr 2008 14:03:33 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Thomas Graf <tgraf@...g.ch>
CC:	hadi@...erus.ca, David Miller <davem@...emloft.net>,
	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-2.6.26] netlink: make socket filters work on netlink

Thomas Graf wrote:
> * Patrick McHardy <kaber@...sh.net> 2008-04-02 12:00
>> jamal wrote:
>>> On Tue, 2008-01-04 at 13:52 +0200, Patrick McHardy wrote:
>>>
>>>> Isn't that what nlmsg_pid already contains?
>>> would work only on the case of user<->user.
>>> On kernel->user it is supposed to be owned by the kernel and set to 0.
>>
>> No, in the case of events its supposed to be set to the pid of the
>> socket that caused the event. Check out qdisc_notify() or rtmsg_ifa()
>> for example.
> 
> Unfortunately in many cases the pid is also set to 0 because the
> information is lost when carrying the event using the notifier
> interface. Probably fixable though.


Yes, I remember some cases but couldn't find them anymore.
Tt should be fixed IMO since there's not much value in this
if its used inconsistently.
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