netdev - Re: [PATCH net-next 0/5] SCTP updates

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Date:	Wed, 09 Jul 2014 12:30:34 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Michael Tuexen <Michael.Tuexen@...chi.franken.de>,
	David Laight <David.Laight@...LAB.COM>
CC:	Neil Horman <nhorman@...driver.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"geirola@...il.com" <geirola@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>
Subject: Re: [PATCH net-next 0/5] SCTP updates

On 07/09/2014 12:12 PM, Michael Tuexen wrote:
> On 09 Jul 2014, at 18:02, David Laight <David.Laight@...LAB.COM> wrote:
> 
>> From: Neil Horman
>> ...
>>>> The problem here is deprecation of ancillary data and that's is a lot tougher
>>>> then socket options.  In this particular case (SCTP_SNDRCVINFO vs SCTP_RCVINFO),
>>>> I don't think there is any way to deprecate the SCTP_SNDRCVINFO since the event
>>>> enabling it is the same as the one for SCTP_RCVINFO.  This was a mistake in the
> I don't think this is true:
> To request SCTP_SNDRCVINFO you use the SCTP_EVENTS option. See
> http://tools.ietf.org/html/rfc6458#section-6.2.1
> To request the SCTP_RCVINFO you use the SCTP_RECVRCVINFO option. See
> http://tools.ietf.org/html/rfc6458#section-8.1.29
> So the user does different things and the kernel can provide the requested
> information.

This is not very clear, but yes.  I've re-re-read the section in question after
sending out that mail and yes this does seem to be the case.

-vlad

> 
> Best regards
> Michael
>>>> spec.  Ancillary data should not have been enabled using even notification api,
>>>> as it is not an event, but we now have to live with it.
>>>>
>>> Ugh I didn't even consider cmsg type overlap.  Thats probably it then, we can't
>>> deprecate it.  Though that does call the question up as to how to differentiate
>>> expectations of the data format for each cmsg, if they use the same type.  Does
>>> the SCTP_RCVINFO data struct overlay the SNDRCVINFO struct exactly?  (sorry I've
>>> not checked myself yet).
>>
>> Not from what I remember from when I read that RFC.
>> I think the lengths are different enough to determine which is which.
>>
>> That RFC (I've forgotten the number) looks like an entire bag of poo
>> that should be ignored...
>>
>> 	David
>>
>>
>>
>> --
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> 

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