netdev - Re: [PATCH 1/2] [IPV4] UDP: Always checksum even if without socket filter

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Date:	Sat, 17 Nov 2007 14:18:46 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Wang Chen <wangchen@...fujitsu.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] [IPV4] UDP: Always checksum even if without socket filter

Wang Chen <wangchen@...fujitsu.com> writes:

> Herbert Xu said the following on 2007-11-16 12:11:
>> Wang Chen <wangchen@...fujitsu.com> wrote:
>>> So, I think the checksum in udp_queue_rcv_skb() actually does
>>> the work, not that in udp_recvmsg() and udp_poll().
>>>
>>> If I am wrong, please point out.
>> 
>> We may have a bug in the accounting area.  Check the recent
>> patch made to UDP/IPv6 which is probably needed here as well.
>> 
>
> Like dave said, decrementing the InDataGrams in this case is an
> option.
> I will check the same place of UDP/IPv6.

And like Benny pointed out it's probably a bad idea because
decrementing counters will be an unexpected ABI change for monitoring 
programs who have no other way to detect overflow.

-Andi
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