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List:       linux-netdev
Subject:    Re: [RFC/PATCH] SO_NO_CHECK for IPv6
From:       Jeff Garzik <jeff () garzik ! org>
Date:       2007-11-22 0:17:40
Message-ID: 4744CAA4.50102 () garzik ! org
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YOSHIFUJI Hideaki / 吉藤英明 wrote:
> In article <20071121124532.GA17263@havoc.gtf.org> (at Wed, 21 Nov 2007 07:45:32 \
> -0500), Jeff Garzik <jeff@garzik.org> says: 
> > SO_NO_CHECK support for IPv6 appeared to be missing. This is presented,
> > based on a reading of net/ipv4/udp.c.
> 
> Disagree. UDP checksum is mandatory in IPv6.

Ah, you mean that I need to turn off UDP checksum on receive end as well 
in IPv6...  true.

For those interested, I am dealing with a UDP app that already does very 
strong checksumming and encryption, so additional software checksumming 
at the lower layers is quite simply a waste of CPU cycles.  Hardware 
checksumming is fine, as long as its "free."

	Jeff



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