netdev - Re: [RFC/PATCH] SO_NO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 21 Nov 2007 19:17:40 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	YOSHIFUJI Hideaki / 吉藤英明 
	<yoshfuji@...ux-ipv6.org>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC/PATCH] SO_NO_CHECK for IPv6

YOSHIFUJI Hideaki / 吉藤英明 wrote:
> In article <20071121124532.GA17263@...oc.gtf.org> (at Wed, 21 Nov 2007 07:45:32 -0500), Jeff Garzik <jeff@...zik.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



-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html