Odin is an SDN framework programmable enterprise WLANs. It provides a platform for developing typical enterprise WLAN services such as mobility managers, and load balancers as "network applications".
For the agent/AP:
- Click Modular Router.
- Open vSwitch.
- An ath9k driver based WiFi card.
Running Odin implies setting up the Odin master, and Odin agents.
If you cloned Odin from the git repository, pull the individual submodules:
$: git clone http://github.com/lalithsuresh/odin $: cd odin $: git submodule init $: git submodule update
To build the master (which is built as an application on top of Floodlight), do the following:
$: cd odin-master $: ant
You should find floodlight.jar inside target/
Before building the agent, apply the patch in odin-driver-patches to your Linux kernel ath9k driver code.
To build the agent, copy the files in odin-agent/src/ to your Click source's /elements/local folder, then build Click.
$: cd odin-agent $: cp src/* <click-folder>/elements/local
Now build Click using your cross compiler. Don't forget to pass the --enable- local flag to Click's configure script.
Generate a Click file for the agent, using your preferred values for the options:
$: python agent-click-file-gen.py <AP_CHANNEL> <QUEUE_SIZE> \ <HW_ADDR_OF_WIFI_INTERFACE> <ODIN_MASTER_IP> <ODIN_MASTER_PORT> > agent.click
The master is to be run on a central server that has IP reachability to all APs in the system. The master expects the following configuration parameter to be set in the floodlight configuration file:
This should point to a pool file, which are essentially slices. An example poolfile is as follows:
# Pool-1 NAME pool-1 NODES 172.17.1.13 172.17.1.21 172.17.1.29 NETWORKS odin APPLICATIONS net.floodlightcontroller.odin.applications.OdinMobilityManager # Pool-2 NAME pool-2 NODES 172.17.1.29 172.17.1.37 172.17.1.45 NETWORKS guest-network APPLICATIONS net.floodlightcontroller.odin.applications.SimpleLoadBalancer
Each pool is defined by a name, a list of IP address of physical APs, the list of SSIDs or NETWORKS to be announced, and a list of applications that operate on that pool.
For testing purposes, if you'd like to assign a static IP to a client and have it connect to odin, you need to specify the client's details in a file pointed to by this property. An example file looks as follows:
00:16:7f:7e:00:00 172.17.4.2 00:1b:1b:7e:00:00 odin-ssid-1 00:16:7f:7e:00:01 172.17.4.3 00:1b:1b:7e:00:01 odin-ssid-2 00:16:7f:7e:00:02 172.17.4.4 00:1b:1b:7e:00:02 odin-ssid-3
Each row represents a client's MAC address, its static IP address, its LVAP's BSSID, and the SSID that its LVAP will announce.
To run the master:
$: java -jar floodlight.jar
To run the agents, first instantiate Open vSwitch and have it connect to the Floodlight controller from above. Next, instantiate a monitor device:
# If on OpenWRT Backfire $: iw phy phy0 interface add mon0 set type monitor $: iw dev wlan0 set channel <required-channel> $: ifconfig mon0 up
Then move the agent.click file generated through the click file generator to the AP, and run the following:
$: click-align agent.click | click &
(Make sure agent.click specifies the same channel as being used by the monitor device.)
Click should have instantiated a tap device named 'ap', which should be added to Open vSwitch' datapath:
$: ovs-dpctl add-if dp0 ap
Wait a few seconds for the agent to successfully connect to the master.
The system is described in the following Masters' thesis: http://lalithsuresh.files.wordpress.com/2011/04/lalith-thesis.pdf