netdev - Re: [BUG] Any-IP IPv6 support broken

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Message-ID: <1446132888.7476.153.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 29 Oct 2015 08:34:48 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Gilberto Bertin <gilberto.bertin@...il.com>,
	Maciej Żenczykowski <maze@...gle.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [BUG] Any-IP IPv6 support broken

On Thu, 2015-10-29 at 15:00 +0000, Gilberto Bertin wrote:
> Hello,
> testing Any-IP on my machine, I noticed that it's not working with IPv6
> addresses.
> Tests are performed on a 4.1 kernel.
> 
> Steps to reproduce the bug:
> 
> 1- make sure Any-IP is working with IPv4 addresses:
> 
> # ip -4 route add local 4.4.4.0/24 dev eth0
> 
> with this command every packets with an IP in the subnet 4.4.4.0/24 will
> be delivered to the eth0 interface.
> We can test this:
> 
> $ ping 4.4.4.1 -c 1 | grep received
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> $ ping 4.4.4.50 -c 1 | grep received
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> $ ping 4.4.4.200 -c 1 | grep received
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> 
> 2- note that it's not actually working with IPv6 addresses:
> 
> # ip -6 route add local abcd:abcd:abcd:abcd::/64 dev eth0
> 
> $ ping6 -c 1 abcd:abcd:abcd:abcd::1 | grep received
> 1 packets transmitted, 0 received, 100% packet loss, time 0ms
> $ ping6 -c 1 abcd:abcd:abcd:abcd::50 | grep received
> 1 packets transmitted, 0 received, 100% packet loss, time 0ms
> $ ping6 -c 1 abcd:abcd:abcd:abcd::100 | grep received
> 1 packets transmitted, 0 received, 100% packet loss, time 0ms
> 
> Since the kernel should support Any-IP with IPv6 addresses (the patch
> was submitted/accepted years ago [1]) I suspect this is a bug.
> 
> Even trying with the commands suggested by the patch [1]:
> # ip -6 rule  add from all iif eth0 lookup 200
> # ip -6 route add local default dev lo table 200
> 
> I was not able to get it working.
> 
> 
> Thank you.
> 
> [1] http://www.spinics.net/lists/netdev/msg141994.html
> 


CC Maciej




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