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I am not entirely sure that any of the open source plugins available in the
neutron source tree currently provides the ability of ensuring security
groups through OVS flow management.
But I might be missing some out-of-tree plugin, of which I have little to
no knowledge.

To answer the initial question - yet it's technically possible, but it's
also cumbersome.
Nova security group rules can easily generate a situation in which
thousands of rules are generated. If not properly handled by adopting
appropriate strategies, such as masking bits for nw addresses, the number
can easily spiral. This means that it is likely that most packes will miss
the kernel-level flow table and require a context switch to user mode (it
might be even worse if you store the rules on the controller and you ask
your switch to fetch them with openflow) - in this case the performance
would be even worse than the double bridge we traverse now.

Said that, it's not impossible. It's just that so far nobody has seriously
tackled this issue.

Regards,
Salvatore


On 3 September 2013 23:54, Ravi Chunduru <ravivsn at gmail.com> wrote:

> It is possible to enforce security groups on OVS provided you have
> Openflow Controller instead of neutron agent managing the OVS switches.
>
>
> On Tue, Sep 3, 2013 at 10:29 AM, Scott Devoid <devoid at anl.gov> wrote:
>
>> +1 for an answer to this.
>>
>> The reference documentation suggests running Neutron OVS with a total of
>> 6 software switches between the VM and public NAT addresses. [1]
>> What are the performances differences folks see with this configuration
>> vs. the 2 software switch configuration for linux bridge?
>>
>> [1]
>> http://docs.openstack.org/grizzly/openstack-network/admin/content/under_the_hood_openvswitch.html#d6e1178
>>
>>
>> On Tue, Sep 3, 2013 at 8:34 AM, Lorin Hochstein <lorin at nimbisservices.com
>> > wrote:
>>
>>> (Also asked at
>>> https://ask.openstack.org/en/question/4718/security-groups-with-ovs-instead-of-iptables/
>>> )
>>>
>>> The only security group implementations in neutron seem to be
>>> iptables-based. Is it technically possible to implement security groups
>>> using openvswitch flow rules, instead of iptables rules?
>>>
>>> It seems like this would cut down on the complexity associated with the
>>> current OVSHybridIptablesFirewallDriver implementation, where we need to
>>> create an extra linux bridge and veth pair to work around the
>>> iptables-openvswitch issues. (This also breaks if the user happens to
>>> install the openvswitch brcompat module).
>>>
>>> Lorin
>>> --
>>> Lorin Hochstein
>>> Lead Architect - Cloud Services
>>> Nimbis Services, Inc.
>>> www.nimbisservices.com
>>>
>>> _______________________________________________
>>> OpenStack-dev mailing list
>>> OpenStack-dev at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>>
>>>
>>
>> _______________________________________________
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>>
>>
>
>
> --
> Ravi
>
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