netdev - Re: [RFC PATCH] extend RTM_GETNEIGH to allow getting more precise information

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Date:	Sat, 23 Jan 2010 02:12:33 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	cratiu@...acom.com
Cc:	netdev@...r.kernel.org, ixlk-cr@...scape.ixiacom.com,
	pchakrabarti@...acom.com
Subject: Re: [RFC PATCH] extend RTM_GETNEIGH to allow getting more precise
 information

From: Cosmin Ratiu <cratiu@...acom.com>
Date: Fri, 15 Jan 2010 18:42:59 +0200

> Please have a look at this patch which tries to solve a problem we 
> encountered.
> 
> The background is that RTM_GETNEIGH netlink message is used to get a complete 
> dump of a neighbor table. Sometimes, that's too much (especially when you have 
> a lot of neighbors). This patch allows one to specify the IPv4/6 address of a 
> neighbor and the device index through which it is accessible in order to 
> obtain only that entry.
> 
> If you have other suggestions on how to accomplish this task, please let us 
> know.

Please add a netlink attribute to specify lookup keys.

Adding specifiers to the end of the existing request message
error prone and creates trouble in the future if someone gets
the idea to add something more.

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