Bob Lantz
135 lines
4.1 KiB
Python
Executable File
135 lines
4.1 KiB
Python
Executable File
#!/usr/bin/python
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"""
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Simple example of Mobility with Mininet
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(aka enough rope to hang yourself.)
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We move a host from s1 to s2, s2 to s3, and then back to s1.
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Gotchas:
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The reference controller doesn't support mobility, so we need to
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manually flush the switch flow tables!
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Good luck!
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to-do:
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- think about wifi/hub behavior
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- think about clearing last hop - why doesn't that work?
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"""
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from mininet.net import Mininet
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from mininet.node import OVSSwitch
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from mininet.topo import LinearTopo
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from mininet.log import output, warn
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from random import randint
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class MobilitySwitch( OVSSwitch ):
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"Switch that can reattach and rename interfaces"
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def delIntf( self, intf ):
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"Remove (and detach) an interface"
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port = self.ports[ intf ]
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del self.ports[ intf ]
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del self.intfs[ port ]
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del self.nameToIntf[ intf.name ]
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def addIntf( self, intf, rename=False, **kwargs ):
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"Add (and reparent) an interface"
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OVSSwitch.addIntf( self, intf, **kwargs )
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intf.node = self
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if rename:
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self.renameIntf( intf )
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def attach( self, intf ):
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"Attach an interface and set its port"
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port = self.ports[ intf ]
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if port:
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if self.isOldOVS():
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self.cmd( 'ovs-vsctl add-port', self, intf )
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else:
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self.cmd( 'ovs-vsctl add-port', self, intf,
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'-- set Interface', intf,
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'ofport_request=%s' % port )
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self.validatePort( intf )
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def validatePort( self, intf ):
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"Validate intf's OF port number"
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ofport = int( self.cmd( 'ovs-vsctl get Interface', intf,
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'ofport' ) )
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if ofport != self.ports[ intf ]:
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warn( 'WARNING: ofport for', intf, 'is actually', ofport,
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'\n' )
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def renameIntf( self, intf, newname='' ):
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"Rename an interface (to its canonical name)"
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intf.ifconfig( 'down' )
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if not newname:
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newname = '%s-eth%d' % ( self.name, self.ports[ intf ] )
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intf.cmd( 'ip link set', intf, 'name', newname )
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del self.nameToIntf[ intf.name ]
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intf.name = newname
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self.nameToIntf[ intf.name ] = intf
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intf.ifconfig( 'up' )
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def moveIntf( self, intf, switch, port=None, rename=True ):
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"Move one of our interfaces to another switch"
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self.detach( intf )
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self.delIntf( intf )
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switch.addIntf( intf, port=port, rename=rename )
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switch.attach( intf )
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def printConnections( switches ):
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"Compactly print connected nodes to each switch"
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for sw in switches:
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output( '%s: ' % sw )
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for intf in sw.intfList():
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link = intf.link
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if link:
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intf1, intf2 = link.intf1, link.intf2
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remote = intf1 if intf1.node != sw else intf2
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output( '%s(%s) ' % ( remote.node, sw.ports[ intf ] ) )
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output( '\n' )
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def moveHost( host, oldSwitch, newSwitch, newPort=None ):
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"Move a host from old switch to new switch"
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hintf, sintf = host.connectionsTo( oldSwitch )[ 0 ]
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oldSwitch.moveIntf( sintf, newSwitch, port=newPort )
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return hintf, sintf
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def mobilityTest():
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"A simple test of mobility"
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print '* Simple mobility test'
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net = Mininet( topo=LinearTopo( 3 ), switch=MobilitySwitch )
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print '* Starting network:'
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net.start()
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printConnections( net.switches )
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print '* Testing network'
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net.pingAll()
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print '* Identifying switch interface for h1'
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h1, old = net.get( 'h1', 's1' )
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for s in 2, 3, 1:
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new = net[ 's%d' % s ]
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port = randint( 10, 20 )
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print '* Moving', h1, 'from', old, 'to', new, 'port', port
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hintf, sintf = moveHost( h1, old, new, newPort=port )
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print '*', hintf, 'is now connected to', sintf
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print '* Clearing out old flows'
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for sw in net.switches:
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sw.dpctl( 'del-flows' )
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print '* New network:'
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printConnections( net.switches )
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print '* Testing connectivity:'
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net.pingAll()
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old = new
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net.stop()
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if __name__ == '__main__':
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mobilityTest()
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