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

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Date:	Wed, 19 Jan 2011 20:47:32 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Jarek Poplawski <jarkao2@...il.com>
cc:	jamal <hadi@...erus.ca>, Pablo Neira Ayuso <pablo@...filter.org>,
	David Miller <davem@...emloft.net>,
	arthur.marsh@...ernode.on.net, eric.dumazet@...il.com,
	netdev@...r.kernel.org
Subject: Re: inbound connection problems when "netlink: test for all flags
 of the NLM_F_DUMP composite" commit applied


On Wednesday 2011-01-19 20:24, Jarek Poplawski wrote:
>> On Wednesday 2011-01-19 17:54, Jarek Poplawski wrote:
>> 
>> It looks like the authors' intentinos were to make NLM_F_MATCH not
>> stop after a single entry has been found. So that sounds like dump,
>> ok.
>> 
>> But NLM_F_ROOT does not quite strike me as a dump request. What if I
>> wanted just a single item returned but still start at the root?
>
>Hmm... Does it say about starting at the root?:
>
>"          NLM_F_ROOT     Return the complete table instead of a
>                          single entry."

I was referring to netlink.h which paraphrased that, perhaps
too short:

#define NLM_F_ROOT      0x100   /* specify tree root    */

But the RFC description makes for a better wording: if NLM_F_ROOT is
supposed to return "the complete table", how is it different from
NLM_F_MATCH with a wildcard criteria?

|          NLM_F_MATCH    Return all entries matching criteria passed in
|                         message content.
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