netdev - Re: Kernel-DOS error in arp mechanism .$(Q#|.(B no delete off incomplete arp adresses

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Message-Id: <20111221.154734.248295514779001007.davem@davemloft.net>
Date:	Wed, 21 Dec 2011 15:47:34 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	richard.weinberger@...il.com, gladewitz@....de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Kernel-DOS error in arp mechanism
 .$(Q#|.(B no delete off incomplete arp adresses

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 21 Dec 2011 10:51:12 +0100

> [PATCH] ipv4: reintroduce route cache garbage collector
> 
> Commit 2c8cec5c10b (ipv4: Cache learned PMTU information in inetpeer)
> removed IP route cache garbage collector a bit too soon, as this gc was
> responsible for expired routes cleanup, releasing their neighbour
> reference.
> 
> As pointed out by Robert Gladewitz, recent kernels can fill and exhaust
> their neighbour cache.
> 
> Reintroduce the garbage collection, since we'll have to wait our
> neighbour lookups become refcount-less to not depend on this stuff.
> 
> Reported-by: Robert Gladewitz <gladewitz@....de>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks Eric.
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