netdev - Re: [PATCH net-next v2] ipv6: enable anycast addresses as source addresses in ICMPv6 error messages

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Date:	Thu, 6 Feb 2014 04:38:49 -0800 (PST)
From:	François-Xavier Le Bail <fx.lebail@...oo.com>
To:	"nicolas.dichtel@...nd.com" <nicolas.dichtel@...nd.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	David Stevens <dlstevens@...ibm.com>,
	Bill Fink <billfink@...dspring.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next v2] ipv6: enable anycast addresses as source addresses in ICMPv6 error messages

> From: Nicolas Dichtel <nicolas.dichtel@...nd.com>


> Subject: Re: [PATCH net-next v2] ipv6: enable anycast addresses as source addresses in ICMPv6 error messages
> 
> Le 19/01/2014 17:00, Francois-Xavier Le Bail a écrit :
> 
>>  - Uses ipv6_anycast_destination() in icmp6_send().
>> 
>>  Suggested-by: Bill Fink <billfink@...dspring.com>
>>  Signed-off-by: Francois-Xavier Le Bail <fx.lebail@...oo.com>
> This patch causes an Oops on my target.

What is your target ?

> Here is the step to reproduce it:
> modprobe sit
> ip link add sit1 type sit remote 10.16.0.121 local 10.16.0.249
> ip l s sit1 up
> ip -6 a a dev sit1 2001:1234::123 remote 2001:1234::121
> ping6 2001:1234::121

I cannot reproduce this in my target (updated net-next x86_64) and
iproute2 from git.
Can you send me your config file ?

> The problem is that ipv6_anycast_destination() uses unconditionally
> skb_dst(skb), which is NULL in this case.
> 
> Not sure what is the best way to fix this, any suggestions?

I will try to reproduce first and see.

Greetings,
Francois-Xavier
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