netdev - Re: [PATCH v2] neigh: set nud_state to NUD_INCOMPLETE when probing router reachability

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Date:	Tue, 13 May 2014 12:43:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	duanj.fnst@...fujitsu.com
Cc:	netdev@...r.kernel.org, jbenc@...hat.com,
	hannes@...essinduktion.org
Subject: Re: [PATCH v2] neigh: set nud_state to NUD_INCOMPLETE when probing
 router reachability

From: Duan Jiong <duanj.fnst@...fujitsu.com>
Date: Fri, 9 May 2014 13:16:48 +0800

> Since commit 7e98056964("ipv6: router reachability probing"), a router falls
> into NUD_FAILED will be probed.
> 
> Now if function rt6_select() selects a router which neighbour state is NUD_FAILED,
> and at the same time function rt6_probe() changes the neighbour state to NUD_PROBE,
> then function dst_neigh_output() can directly send packets, but actually the
> neighbour still is unreachable. If we set nud_state to NUD_INCOMPLETE instead
> NUD_PROBE, packets will not be sent out until the neihbour is reachable.
> 
> In addition, because the route should be probes with a single NS, so we must
> set neigh->probes to neigh_max_probes(), then the neigh timer timeout and function
> neigh_timer_handler() will not send other NS Messages.
> 
> Signed-off-by: Duan Jiong <duanj.fnst@...fujitsu.com>

Applied and queued up for -stable, thanks.
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