netdev - Re: [PATCH v2] net IPv6 : Fix broken IPv6 routing table after loopback down-up

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Message-Id: <20130402.143755.2007878338808163006.davem@davemloft.net>
Date:	Tue, 02 Apr 2013 14:37:55 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	kumaran.4353@...il.com
Cc:	yoshfuji@...ux-ipv6.org, eric.dumazet@...il.com, kaber@...sh.net,
	kuznet@....inr.ac.ru, jmorris@...ei.org,
	Balakumaran.Kannan@...sony.com, maruthi.thotad@...sony.com,
	netdev@...r.kernel.org, jamshed.a@...sony.com,
	amit.agarwal@...sony.com, takuzo.ohara@...sony.com,
	aaditya.kumar@...sony.com
Subject: Re: [PATCH v2] net IPv6 : Fix broken IPv6 routing table after
 loopback down-up

From: Balakumaran Kannan <kumaran.4353@...il.com>
Date: Tue, 02 Apr 2013 16:15:05 +0530

> IPv6 Routing table becomes broken once we do ifdown, ifup of the loopback(lo)
> interface. After down-up, routes of other interface's IPv6 addresses through
> 'lo' are lost.
> 
> IPv6 addresses assigned to all interfaces are routed through 'lo' for internal
> communication. Once 'lo' is down, those routing entries are removed from routing
> table. But those removed entries are not being re-created properly when 'lo' is
> brought up. So IPv6 addresses of other interfaces becomes unreachable from the
> same machine. Also this breaks communication with other machines because of
> NDISC packet processing failure.
> 
> This patch fixes this issue by reading all interface's IPv6 addresses and adding
> them to IPv6 routing table while bringing up 'lo'.
> 
> Patch is prepared for Linux-3.9.rc5 kernel.
> 
> Signed-off-by: Balakumaran Kannan <Balakumaran.Kannan@...sony.com>
> Signed-off-by: Maruthi Thotad <Maruthi.Thotad@...sony.com>

Applied, thanks.
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