netdev - Re: [PATCH v2] ipv6: update Destination Cache entries when gateway turn into host

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Date:	Thu, 15 May 2014 23:26:38 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	duanj.fnst@...fujitsu.com
Cc:	hannes@...essinduktion.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2] ipv6: update Destination Cache entries when gateway
 turn into host

From: Duan Jiong <duanj.fnst@...fujitsu.com>
Date: Thu, 15 May 2014 15:56:14 +0800

> 
> RFC 4861 states in 7.2.5:
> 
> 	The IsRouter flag in the cache entry MUST be set based on the
>          Router flag in the received advertisement.  In those cases
>          where the IsRouter flag changes from TRUE to FALSE as a result
>          of this update, the node MUST remove that router from the
>          Default Router List and update the Destination Cache entries
>          for all destinations using that neighbor as a router as
>          specified in Section 7.3.3.  This is needed to detect when a
>          node that is used as a router stops forwarding packets due to
>          being configured as a host.
> 
> Currently, when dealing with NA Message which IsRouter flag changes from
> TRUE to FALSE, the kernel only removes router from the Default Router List,
> and don't update the Destination Cache entries.
> 
> Now in order to update those Destination Cache entries, i introduce
> function rt6_clean_tohost().
> 
> Signed-off-by: Duan Jiong <duanj.fnst@...fujitsu.com>

Applied, thank you.
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