netdev - Re: [PATCH] IPv6:fix the return interface index when get it while no message is received

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Message-ID: <48AB87DE.1010205@cn.fujitsu.com>
Date:	Wed, 20 Aug 2008 10:56:30 +0800
From:	Yang Hongyang <yanghy@...fujitsu.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] IPv6:fix the return interface index when get it while
 no message is received

Vlad Yasevich wrote:
> Yang Hongyang wrote:
>> David Miller wrote:
>>> From: Vlad Yasevich <vladislav.yasevich@...com>
>>> Date: Mon, 18 Aug 2008 09:31:07 -0400
>>>
>>>> I don't think that's correct at all.  The code path shows here is
>>>> when there are no received options and no sticky options set.  In
>>>> such case, we shouldn't be returning multicast or bound interfaces.
>>>> We should be returning 0.
>> I use setsockopt() to set the bounded interface of the socket, and 
>> then I get receiving interface index while no message is received through
>> the above socket,shoudn't the bounded interface be returned?
> 
> One of the problems is that we don't seem to support the sticky IPV6_PKTINFO
> option as specified in rfc3542.
> 
> The setting of SO_BINDTODEVICE should not impact the return of the sticky option
> values when they are not set.  A return of 0 in the sticky options means that
> that value has not been specified.  If you return anything else, you give
> the illusion that a sticky option was set.
> 
>>>> Additionally the address returned is completely bogus as well. We
>>>> are returning the address our peer instead of the one of our own
>>>> addresses.
>> If message is received,the address returned is what the received
>> message refered to, otherwise the address returned is what I used setsockopt()
>> to set before.
> 
> We are returning np->daddr, which is the peer address.
> 
> The expected value is "destination of the received packet".  In the worst case,
> it should be the locally bound address.  In the correct case, it should be the
> address set in the sticky options if such is set.  It really should be 0::0, if there
> are no sticky options and no packets have been received.

Since here we do not recive any packet,we should return 
src_info.ipi6_ifindex=0 and src_info.ipi6_addr=0::0,right?

> 
> -vlad
> 
>>> Yang, please fix this up, thank you.
>>>
>>>
>> Seems that I misunderstood the RFC?



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