def __init__(self, fileName = None, network={'ip':'192.168.1.','netmask':'/24'}, controller = None):
"""
Create a testbed topology
:param fileName: filename for configuration (None for hard-coded default)
:param network: Hash of ip, netmask for host IPv4 address assignment
:param controller: Controller object (or subclass thereof)
:return:
"""
self.hostID = 1
self.switchID = 1
self.dpidIndex = 1
self.nodes = {}
self.hosts = []
self.hostIndex = {} # [hostname] = Host
self.switches = []
self.switchIndex = {} # [switchname] = Switch
self.links = [] # all links including those in sites, pops, vpns, and wan
self.linkIndex = {} # [linkname] = Link
self.ports = [] # all ports
self.portIndex = {} # [portname] = Port
self.sites = []
self.siteIndex = {} # [sitename] = Site
self.sitesConfig = []
self.pops = []
self.popIndex = {} # [popname] = SDNPop
self.wan = Wan(name='esnet')
self.network = network
if self.network['ip'][-1] == '.':
self.network['ip'] = self.network['ip'][:-1]
self.dpidToName = {}
self.mininetToRealNames = {}
self.controller = controller
if fileName != None:
self.loadConfiguration(fileName)
else:
self.locations = locations
self.sitesConfig = sites
self.loadDefault()
class TopoBuilder ():
debug = False;
def __init__(self, fileName = None, network={'ip':'192.168.1.','netmask':'/24'}, controller = None):
"""
Create a testbed topology
:param fileName: filename for configuration (None for hard-coded default)
:param network: Hash of ip, netmask for host IPv4 address assignment
:param controller: Controller object (or subclass thereof)
:return:
"""
self.hostID = 1
self.switchID = 1
self.dpidIndex = 1
self.nodes = {}
self.hosts = []
self.hostIndex = {} # [hostname] = Host
self.switches = []
self.switchIndex = {} # [switchname] = Switch
self.links = [] # all links including those in sites, pops, vpns, and wan
self.linkIndex = {} # [linkname] = Link
self.ports = [] # all ports
self.portIndex = {} # [portname] = Port
self.sites = []
self.siteIndex = {} # [sitename] = Site
self.sitesConfig = []
self.pops = []
self.popIndex = {} # [popname] = SDNPop
self.wan = Wan(name='esnet')
self.network = network
if self.network['ip'][-1] == '.':
self.network['ip'] = self.network['ip'][:-1]
self.dpidToName = {}
self.mininetToRealNames = {}
self.controller = controller
if fileName != None:
self.loadConfiguration(fileName)
else:
self.locations = locations
self.sitesConfig = sites
self.loadDefault()
def displaySwitches(self):
print "\nName\t\t\tDPID\t\tODL Name\tMininet Name\n"
for sw in self.switches:
if 'dpid' in sw.props:
print sw.name,"\t",binascii.hexlify(sw.props['dpid']),"\topenflow:" + str(sw.props['dpid'][7]),"\t",sw.props['mininetName']
print "\n\n"
def displayHosts(self,vpn):
print "\nName\t\tIPv4 Address\tMininet Name\t"
for host in self.hosts:
print h.name,"\t",h.props['ip'],"\t",h.props['mininetName']
print "\n\n"
def addSwitch(self, switch):
self.switches.append(switch)
self.switchIndex[switch.name] = switch
def addSDNPop(self, popname, hwswitchname, coreroutername, swswitchname, nbOfLinks):
pop = SDNPop(popname, hwswitchname, coreroutername, swswitchname, nbOfLinks)
self.addSwitch(pop.props['hwSwitch'])
self.addSwitch(pop.props['coreRouter'])
self.addSwitch(pop.props['swSwitch'])
self.addHost(pop.props['serviceVm'])
self.addLinks(pop.props['links'])
self.popIndex[popname] = pop
self.pops.append(pop)
def updateHost(self, host):
host.update(self.getHostParams(host.name))
def updateSwitch(self, switch):
switch.update(self.getSwitchParams(switch.name))
role = switch.get('role')
if role: # hwSwitch, coreRouter, swSwitch
switch.update({'controller':self.controller})
def loadDefault(self):
"""
We make several simplifying assumptions here:
1. All POPs have roughly the same "shape", with a hardware switch, a software switch,
and a core router.
2. The router is simulated by an OpenFlow switch.
3. All OpenFlow switches have the same controller object used to access them.
4. All OpenFlow switches can be represented by the same object class.
"""
# init self.pops
for location in self.locations:
(popname, hwswitchname, coreroutername, swswitchname, nbOfLinks) = (location[0], location[1], location[2], location[0] + "-ovs", location[3])
self.addSDNPop(popname, hwswitchname, coreroutername, swswitchname, nbOfLinks)
# create mesh between core routers, attached to VLANs between the core routers and hardware switches
self.wan.connectAll(self.pops, 1000)
self.addLinks(self.wan.props['links'])
for (sitename, hostnames, popname, portno) in self.sitesConfig:
site = self.addSite(sitename, popname, portno)
for name in hostnames:
hostname = name + "@" + sitename
host = Host(name=hostname)
site.addHost(host)
self.addHost(host)
self.addLinks(site.props['links'])
for host in self.hosts:
self.updateHost(host)
for switch in self.switches:
self.updateSwitch(switch)
def addSite(self, sitename, popname, portno = 0):
# create the site
site = Site(sitename)
self.addSwitch(site.props['siteRouter'])
# access the pop
pop = self.popIndex[popname]
# connect site and pop
link = Link.create(site.props['siteRouter'], pop.props['coreRouter'])
link.setPortType('SiteToCore', 'CoreToSite')
site.setPop(pop, link)
pop.addSite(site, link, portno)
self.siteIndex[sitename] = site
self.sites.append(site)
return site
def addHost(self, host):
self.hosts.append(host)
self.hostIndex[host.name] = host
def addHosts(self, hosts):
for host in hosts:
self.addHost(host)
def addLink(self, link):
self.links.append(link)
self.linkIndex[link.name] = link
self.addPort(link.props['endpoints'][0])
self.addPort(link.props['endpoints'][1])
def addLinks(self, links):
for link in links:
self.addLink(link)
def addPort(self, port):
if not port.name in self.portIndex:
self.ports.append(port)
self.portIndex[port.name] = port
def getHostParams(self,name):
index = self.hostID
self.hostID += 1
mininetName = "h" + str(index)
self.mininetToRealNames[mininetName] = name
ip = self.network['ip'] + "." + str(index) + self.network['netmask']
return {'mininetName' : mininetName, 'ip' : ip, 'mac' : MACAddress(index)}
def getSwitchParams(self,name):
index = self.switchID
self.switchID += 1
# for mininet
mininetName = "s" + str(index)
self.mininetToRealNames[mininetName] = name
# Create dpid
index = self.dpidIndex
self.dpidIndex += 1
dpid = array('B',struct.unpack("8B", struct.pack("!Q", index)))
self.dpidToName[binascii.hexlify(dpid)] = name
return {"mininetName" : mininetName, "dpid" : dpid}
def loadConfiguration(self,fileName):
"""
loads the topology Mininet needs to create as described in a file. The format is a dictionary with
the following structure:
:param fileName:
:return:
"""
f = open(fileName,"r")
self.config = eval (f.read())
f.close()
