Re: [ovs-discuss] Can we add a wifi network interface to an OVS bridge?

[Raymond Burkholder]

On 8/21/20 7:38 AM, Jordan Sandri wrote:

Hello,
I would like to know if it is possible to add a wifi network interface 
to an OVS bridge? Let me explain first what I achieved.


If you are using hostapd, there is something you can build into it which 
will add the interface to ovs:


https://blog.raymond.burkholder.net/index.php?/archives/762-Using-Quilt-to-Patch-a-Debian-Package-hostapd.html


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Re: [ovs-discuss] Can we add a wifi network interface to an OVS bridge?

[Matthias May via discuss]

On 21/08/2020 15:38, Jordan Sandri wrote:
> Hello,
> I would like to know if it is possible to add a wifi network interface
> to an OVS bridge? Let me explain first what I achieved.
> As you can see in the first diagram I have 2 raspberry pis with an OVS
> bridge and each of them is connected to ONOS. Using Docker on each pi
> I have 2 containers and there are linked to my bridge thanks to
> ovs-docker (int stands for interface). Then, the network interface
> eth0 from each pi is added to the bridge and raspberry pis are linked
> with an ethernet cable through eth0 of course. Finally, CTN1 is able
> to ping CTN3 for example.
>
> Now, I would like to replace eth0 by a wifi network interface wlan1 as
> you can see in the second diagram. I was thinking maybe using iptables
> to forward flow to the second pi or adding virtual interfaces included
> to the bridge as in the diagram3. Then I could use iptables to forward
> flow from vport to wlan and from wlan to wlan of the second pi. What
> will be the best way to carry out this?
>
> Thank you for you help
>
>
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>  
Hi
For "normal" wifi you can't simply bridge the wlan interface of the client.
You can bridge it on the AP.
This is, because in wifi you don't have a source-MAC and a
destination-MAC, but also a transmitter-MAC and a receiver-MAC.
As an optimisation, in ap2sta direction the destination and the receiver
are a single field.
In sta2ap direction, the source and the transmitter are a single field

Take a look at 4addr mode which solves the issue by having actually all
4 fields.
This is a linux specific implementation and may not be available on all
types of cards.

An alternative would be to have a routed connection between the two
devices and bridge your ovs-instances via GRETAP.

BR
Matthias
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[ovs-discuss] Can we add a wifi network interface to an OVS bridge?

[Jordan Sandri]

Hello,
I would like to know if it is possible to add a wifi network interface to an 
OVS bridge? Let me explain first what I achieved.
As you can see in the first diagram I have 2 raspberry pis with an OVS bridge 
and each of them is connected to ONOS. Using Docker on each pi I have 2 
containers and there are linked to my bridge thanks to ovs-docker (int stands 
for interface). Then, the network interface eth0 from each pi is added to the 
bridge and raspberry pis are linked with an ethernet cable through eth0 of 
course. Finally, CTN1 is able to ping CTN3 for example.

Now, I would like to replace eth0 by a wifi network interface wlan1 as you can 
see in the second diagram. I was thinking maybe using iptables to forward flow 
to the second pi or adding virtual interfaces included to the bridge as in the 
diagram3. Then I could use iptables to forward flow from vport to wlan and from 
wlan to wlan of the second pi. What will be the best way to carry out this?

Thank you for you help

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