-----Original Message-----
From: ovsdb-dev-bounces@... [mailto:ovsdb-dev-bounces@...] On Behalf Of Marcelo Amaral
Sent: 02 September 2015 08:54
To: Flavio Fernandes
Cc: Vasudevan, Swaminathan (PNB Roseville); Andre Fredette; ovsdb-dev; Tim Rozet
Subject: Re: [ovsdb-dev] idea for work in ovsdb netvirt L3: icmp responder

Hi Flavio,

I managed to extend ovs to accept icmp packets configuration.

I am trying to create the OF rule to replay ping from the gateway, for
instance:
sudo ovs-ofctl add-flow -OOpenFlow13 br-int "table=20, dl_type=0x0800, nw_proto=1, icmp_code=0, ip_dst=10.1.0.1, actions=move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[],
mod_dl_src:fa:16:3e:13:b5:f0,
load:0x00->NXM_OF_ICMP_TYPE[], load:0x00->NXM_OF_ICMP_CODE[], move:NXM_OF_IP_SRC[]->NXM_OF_IP_DST[], load:0x10101->NXM_OF_IP_SRC[], in_port"

But It is not working yet. Do you have any clue about what is missing?

Best,
Marcelo Amaral

On 12/08/15 05:26, Flavio Fernandes wrote:

[cc: ovsdb-dev]

Hi Marcelo,

It was really nice meting at the Summit! Sorry for not having a lot of extra time to mingle.

You mentioned you were looking for some work on ovsdb L3 and I thought
of a very specific task that would have a great impact in the L3 work; which may be within the time you have left to work on your internship.

While doing the demo [demo], Tim Rozet pointed out how tenant vms
cannot get a response when pinging their default gateway. As explained
in the "Final thoughts” of my blog [1], this is the case because there is no ip stack to handle any packets destined to the neutron router.

A solution to this would be to extend the arp responder table (20) to
have rules that match on a specific icmp query packets, move things
around to turn it into a ping response and send the packet out of the
in_port. the arp handling code [2] can be a guide in how that gets
accomplished. A way of prototyping this would be to create the rule ‘manually’ [3] after doing the demo [demo] and coming up with what it would look like; similar to how Dave Tucker and I started off when doing L3 [4].

@Tim: did you ever open the bug on this? If not, please do.
@Marcelo: would this be something you would be interested to work on?

Thanks,

— flavio

[demo]: https://youtu.be/2axNKHvt5MY?t=29m46s
[1]:
http://www.flaviof.com/blog/work/how-to-odl-with-openstack-part2.html
[2]:
https://github.com/opendaylight/ovsdb/blob/master/openstack/net-virt/s
rc/main/java/org/opendaylight/ovsdb/openstack/netvirt/api/ArpProvider.
java#L18
[3]: sh ovs-ofctl add-flow -OOpenFlow13 br-int “table=20, dl_type=0x800,nw_proto=1,icmp_code=..."
[4]: http://dtucker.co.uk/hack/building-a-router-with-openvswitch.html

--
Marcelo Amaral, PhD Candidate
BSC Associate Researcher
Dept. d'Arquitectura de Computadors, Univ. Politecnica de Catalunya UPC Campus Nord - Modul D6-112, Jordi Girona 1-3, Barcelona 08034, SPAIN http://people.ac.upc.edu/mamaral http://www.bsc.es/autonomic


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