What is Prince:

Prince is an open source implementation of the PopRouting Algorithm. It has been developed as a Google Summer of Code Project in collaboration with the University of Trento. PopRouting is an algorithm to calculate the optimal values for the messages timers of a link state routing protocol (OLSR, OSPF, etc). It fetches the topology data from the routing protocol, calculate the betweenness centrality for every node of the network and then push back the new timer's value. Currently supports OONF and OLSRd.

Using Prince on Openwrt / LEDE

Since v0.2 prince can be found in the LEDE/OpenWRT routing feeds.

opkg update
opkg install prince

Using Prince with OONF

Prince requires these plugins to work: remotecontrol, telnet, netjsoninfo.

This is a configuration example for OONF that works with prince:

[global]
      plugin remotecontrol

[log]
        stderr false
        file /var/log/olsrd2.log

[telnet]
	bindto	127.0.0.1
	allowed session 10

[remotecontrol]
	acl	default_accept

[interface=wlan0]
[interface=lo]

Using Prince with OLSRd

Prince requires these plugins to work: jsoninfo, poprouting.

This is a configuration example for OLSRd that works with prince:

DebugLevel  1
IpVersion 4
FIBMetric "flat"
LinkQualityFishEye  0


LoadPlugin "../olsrd/lib/jsoninfo/olsrd_jsoninfo.so.1.1"{
    PlParam "accept" "0.0.0.0"
    PlParam "port" "2009"
}

LoadPlugin "../olsrd/lib/poprouting/olsrd_poprouting.so.1.0"{
    PlParam "accept" "0.0.0.0"
    PlParam "port" "2008"
}

InterfaceDefaults {
    TcInterval 5.0
    HelloInterval   2.0
}

Interface "wlan0" {}

NB: LinkQualityFishEye must be set to 0 in order to PopRouting to works

Prince Configuration

Prince can be configured with a configuration file, this is an example:

{
  "proto":{
    "protocol": "oonf",
    "host": "127.0.0.1",
    "port": 2009,
    "timer_port": 2009,
    "refresh": 1,
    "log_file" : "",
    "json_type": "netjson"

  },
  "graph-parser":{
    "heuristic": 1,
    "weights": 0,
    "recursive": 1,
    "stop_unchanged": 0,
    "multithreaded": 1
  }
}

Proto

protocol specifies whether prince should interact with the routing daemon olsr or oonf.

host specify the address to reach the routing daemon, usually is localhost (127.0.0.1)

port is used to specify the port from where prince will pull the topology data

timer_port is used to specify the port to where prince will push the updated timers.

refresh specify the refresh rate at which prince will calculate the updated timers.

log_file is used to benchmark PRINCE and to check if the timers and the centrality are correct, do not use it in production.

json_type is used to specify which format of json topology we are parsing. It is used only by OLSRv1 plugin, supported values are: netjson or jsoninfo.

Graph Parser

heuristic specify whether graph_parser should use the heuristic described in this paper to optimize the centrality computation

weights specify whether graph_parser should use weights in the centrality computation

recursive

stop_unchanged

multithreaded specify whether graph parser should use multiple thread to compute the centrality

Development

Install the dependencies:

apt-get install libjson-c-dev

Make a build directory in the repo

mkdir build && cd build
cmake ..
make
sudo make install

Debug

Set the build type to debug, this will add gdb's debug symbols to the binary

cmake .. -DCMAKE_BUILD_TYPE=Debug

Release

Set the build type to release to ask the compiler for more error checking

cmake .. -DCMAKE_BUILD_TYPE=Release

You can include gdb's debug symbols in a release using

cmake .. -DCMAKE_BUILD_TYPE=ReleaseWithDebug