netdev - Re: [PATCH v2 net-next] ipv[4|6]: correct dropwatch false positive in local_deliver

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Message-Id: <20130301.155709.1482599990846126981.davem@davemloft.net>
Date:	Fri, 01 Mar 2013 15:57:09 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	nhorman@...driver.com, netdev@...r.kernel.org, reich@...icom.com
Subject: Re: [PATCH v2 net-next] ipv[4|6]: correct dropwatch false positive
 in local_deliver_finish

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 01 Mar 2013 09:56:44 -0800

> On Fri, 2013-03-01 at 12:44 -0500, Neil Horman wrote:
>> I had a report recently of a user trying to use dropwatch to localise some frame
>> loss, and they were getting false positives.  Turned out they were using a user
>> space SCTP stack that used raw sockets to grab frames.  When we don't have a
>> registered protocol for a given packet, we record it as a drop, even if a raw
>> socket receieves the frame.  We should only record the drop in the event a raw
>> socket doesnt exist to receive the frames
>> 
>> Tested by the reported successfully
>> 
>> Signed-off-by: Neil Horman <nhorman@...driver.com>
>> Reported-by: William Reich <reich@...icom.com>
>> Tested-by: William Reich <reich@...icom.com>
>> CC: "David S. Miller" <davem@...emloft.net>
>> CC: William Reich <reich@...icom.com>
>> CC: eric.dumazet@...il.com
>> ---
>>  net/ipv4/ip_input.c  | 6 ++++--
>>  net/ipv6/ip6_input.c | 6 ++++--
>>  2 files changed, 8 insertions(+), 4 deletions(-)
> 
> Thanks !
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>

This seems like a reasonable bug fix so I'm going to apply this to
'net', thanks everyone.
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