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"""
Node objects for Mininet.
Nodes provide a simple abstraction for interacting with hosts, switches
and controllers. Local nodes are simply one or more processes on the local
machine.
Node: superclass for all (primarily local) network nodes.
Host: a virtual host. By default, a host is simply a shell; commands
may be sent using Cmd (which waits for output), or using sendCmd(),
which returns immediately, allowing subsequent monitoring using
monitor(). Examples of how to run experiments using this
functionality are provided in the examples/ directory.
Switch: superclass for switch nodes.
UserSwitch: a switch using the user-space switch from the OpenFlow
reference implementation.
KernelSwitch: a switch using the kernel switch from the OpenFlow reference
implementation.
OVSSwitch: a switch using the OpenVSwitch OpenFlow-compatible switch
implementation (openvswitch.org).
Controller: superclass for OpenFlow controllers. The default controller
is controller(8) from the reference implementation.
NOXController: a controller node using NOX (noxrepo.org).
RemoteController: a remote controller node, which may use any
arbitrary OpenFlow-compatible controller, and which is not
created or managed by mininet.
Future enhancements:
- Possibly make Node, Switch and Controller more abstract so that
they can be used for both local and remote nodes
- Create proxy objects for remote nodes (Mininet: Cluster Edition)
"""
import os
import re
import signal
import select
from subprocess import Popen, PIPE, STDOUT
from time import sleep
from mininet.log import info, error, debug
from mininet.util import quietRun, makeIntfPair, moveIntf, isShellBuiltin
from mininet.moduledeps import moduleDeps, pathCheck, OVS_KMOD, OF_KMOD, TUN
SWITCH_PORT_BASE = 1 # For OF > 0.9, switch ports start at 1 rather than zero
class Node( object ):
"""A virtual network node is simply a shell in a network namespace.
We communicate with it using pipes."""
inToNode = {} # mapping of input fds to nodes
outToNode = {} # mapping of output fds to nodes
portBase = 0 # Nodes always start with eth0/port0, even in OF 1.0
def __init__( self, name, inNamespace=True,
defaultMAC=None, defaultIP=None, **kwargs ):
"""name: name of node
inNamespace: in network namespace?
defaultMAC: default MAC address for intf 0
defaultIP: default IP address for intf 0"""
self.name = name
self.inNamespace = inNamespace
self.defaultIP = defaultIP
self.defaultMAC = defaultMAC
opts = '-cdp'
if self.inNamespace:
opts += 'n'
cmd = [ 'mnexec', opts, 'bash', '-m' ]
self.shell = Popen( cmd, stdin=PIPE, stdout=PIPE, stderr=STDOUT,
close_fds=False )
self.stdin = self.shell.stdin
self.stdout = self.shell.stdout
self.pid = self.shell.pid
self.pollOut = select.poll()
self.pollOut.register( self.stdout )
# Maintain mapping between file descriptors and nodes
# This is useful for monitoring multiple nodes
# using select.poll()
self.outToNode[ self.stdout.fileno() ] = self
self.inToNode[ self.stdin.fileno() ] = self
self.intfs = {} # dict of port numbers to interface names
self.ports = {} # dict of interface names to port numbers
# replace with Port objects, eventually ?
self.ips = {} # dict of interfaces to ip addresses as strings
self.macs = {} # dict of interfacesto mac addresses as strings
self.connection = {} # remote node connected to each interface
self.execed = False
self.lastCmd = None
self.lastPid = None
self.readbuf = ''
self.waiting = False
# Stash additional information as desired
self.args = kwargs
@classmethod
def fdToNode( cls, fd ):
"""Return node corresponding to given file descriptor.
fd: file descriptor
returns: node"""
node = Node.outToNode.get( fd )
return node or Node.inToNode.get( fd )
def cleanup( self ):
"Help python collect its garbage."
self.shell = None
# Subshell I/O, commands and control
def read( self, maxbytes=1024 ):
"""Buffered read from node, non-blocking.
maxbytes: maximum number of bytes to return"""
count = len( self.readbuf )
if count < maxbytes:
data = os.read( self.stdout.fileno(), maxbytes - count )
self.readbuf += data
if maxbytes >= len( self.readbuf ):
result = self.readbuf
self.readbuf = ''
else:
result = self.readbuf[ :maxbytes ]
self.readbuf = self.readbuf[ maxbytes: ]
return result
def readline( self ):
"""Buffered readline from node, non-blocking.
returns: line (minus newline) or None"""
self.readbuf += self.read( 1024 )
if '\n' not in self.readbuf:
return None
pos = self.readbuf.find( '\n' )
line = self.readbuf[ 0 : pos ]
self.readbuf = self.readbuf[ pos + 1: ]
return line
def write( self, data ):
"""Write data to node.
data: string"""
os.write( self.stdin.fileno(), data )
def terminate( self ):
"Send kill signal to Node and clean up after it."
os.kill( self.pid, signal.SIGKILL )
self.cleanup()
def stop( self ):
"Stop node."
self.terminate()
def waitReadable( self, timeoutms=None ):
"""Wait until node's output is readable.
timeoutms: timeout in ms or None to wait indefinitely."""
if len( self.readbuf ) == 0:
self.pollOut.poll( timeoutms )
def sendCmd( self, *args, **kwargs ):
"""Send a command, followed by a command to echo a sentinel,
and return without waiting for the command to complete.
args: command and arguments, or string
printPid: print command's PID?"""
assert not self.waiting
printPid = kwargs.get( 'printPid', True )
if len( args ) > 0:
cmd = args
if not isinstance( cmd, str ):
cmd = ' '.join( cmd )
if not re.search( r'\w', cmd ):
# Replace empty commands with something harmless
cmd = 'echo -n'
if len( cmd ) > 0 and cmd[ -1 ] == '&':
separator = '&'
cmd = cmd[ :-1 ]
else:
separator = ';'
if printPid and not isShellBuiltin( cmd ):
cmd = 'mnexec -p ' + cmd
self.write( cmd + separator + ' printf "\\177" \n' )
self.lastCmd = cmd
self.lastPid = None
self.waiting = True
def sendInt( self, sig=signal.SIGINT ):
"Interrupt running command."
if self.lastPid:
try:
os.kill( self.lastPid, sig )
except OSError:
pass
def monitor( self, timeoutms=None ):
"""Monitor and return the output of a command.
Set self.waiting to False if command has completed.
timeoutms: timeout in ms or None to wait indefinitely."""
self.waitReadable( timeoutms )
data = self.read( 1024 )
# Look for PID
marker = chr( 1 ) + r'\d+\n'
if chr( 1 ) in data:
markers = re.findall( marker, data )
if markers:
self.lastPid = int( markers[ 0 ][ 1: ] )
data = re.sub( marker, '', data )
# Look for sentinel/EOF
if len( data ) > 0 and data[ -1 ] == chr( 127 ):
self.waiting = False
data = data[ :-1 ]
elif chr( 127 ) in data:
self.waiting = False
data = data.replace( chr( 127 ), '' )
return data
def waitOutput( self, verbose=False ):
"""Wait for a command to complete.
Completion is signaled by a sentinel character, ASCII(127)
appearing in the output stream. Wait for the sentinel and return
the output, including trailing newline.
verbose: print output interactively"""
log = info if verbose else debug
output = ''
while self.waiting:
data = self.monitor()
output += data
log( data )
return output
def cmd( self, *args, **kwargs ):
"""Send a command, wait for output, and return it.
cmd: string"""
verbose = kwargs.get( 'verbose', False )
log = info if verbose else debug
log( '*** %s : %s\n' % ( self.name, args ) )
self.sendCmd( *args, **kwargs )
return self.waitOutput( verbose )
def cmdPrint( self, *args):
"""Call cmd and printing its output
cmd: string"""
return self.cmd( *args, **{ 'verbose': True } )
# Interface management, configuration, and routing
# BL notes: This might be a bit redundant or over-complicated.
# However, it does allow a bit of specialization, including
# changing the canonical interface names. It's also tricky since
# the real interfaces are created as veth pairs, so we can't
# make a single interface at a time.
def intfName( self, n ):
"Construct a canonical interface name node-ethN for interface n."
return self.name + '-eth' + repr( n )
def newPort( self ):
"Return the next port number to allocate."
if len( self.ports ) > 0:
return max( self.ports.values() ) + 1
return self.portBase
def addIntf( self, intf, port=None ):
"""Add an interface.
intf: interface name (e.g. nodeN-ethM)
port: port number (optional, typically OpenFlow port number)"""
if port is None:
port = self.newPort()
self.intfs[ port ] = intf
self.ports[ intf ] = port
#info( '\n' )
#info( 'added intf %s:%d to node %s\n' % ( intf,port, self.name ) )
if self.inNamespace:
#info( 'moving w/inNamespace set\n' )
moveIntf( intf, self )
def registerIntf( self, intf, dstNode, dstIntf ):
"Register connection of intf to dstIntf on dstNode."
self.connection[ intf ] = ( dstNode, dstIntf )
def connectionsTo( self, node):
"Return [(srcIntf, dstIntf)..] for connections to dstNode."
# We could optimize this if it is important
connections = []
for intf in self.connection.keys():
dstNode, dstIntf = self.connection[ intf ]
if dstNode == node:
connections.append( ( intf, dstIntf ) )
return connections
# This is a symmetric operation, but it makes sense to put
# the code here since it is tightly coupled to routines in
# this class. For a more symmetric API, you can use
# mininet.util.createLink()
def linkTo( self, node2, port1=None, port2=None ):
"""Create link to another node, making two new interfaces.
node2: Node to link us to
port1: our port number (optional)
port2: node2 port number (optional)
returns: intf1 name, intf2 name"""
node1 = self
if port1 is None:
port1 = node1.newPort()
if port2 is None:
port2 = node2.newPort()
intf1 = node1.intfName( port1 )
intf2 = node2.intfName( port2 )
makeIntfPair( intf1, intf2 )
node1.addIntf( intf1, port1 )
node2.addIntf( intf2, port2 )
node1.registerIntf( intf1, node2, intf2 )
node2.registerIntf( intf2, node1, intf1 )
return intf1, intf2
def deleteIntfs( self ):
"Delete all of our interfaces."
# In theory the interfaces should go away after we shut down.
# However, this takes time, so we're better off removing them
# explicitly so that we won't get errors if we run before they
# have been removed by the kernel. Unfortunately this is very slow,
# at least with Linux kernels before 2.6.33
for intf in self.intfs.values():
quietRun( 'ip link del ' + intf )
info( '.' )
# Does it help to sleep to let things run?
sleep( 0.001 )
def setMAC( self, intf, mac ):
"""Set the MAC address for an interface.
mac: MAC address as string"""
result = self.cmd( 'ifconfig', intf, 'down' )
result += self.cmd( 'ifconfig', intf, 'hw', 'ether', mac )
result += self.cmd( 'ifconfig', intf, 'up' )
return result
def setARP( self, ip, mac ):
"""Add an ARP entry.
ip: IP address as string
mac: MAC address as string"""
result = self.cmd( 'arp', '-s', ip, mac )
return result
def setIP( self, intf, ip, prefixLen=8 ):
"""Set the IP address for an interface.
intf: interface name
ip: IP address as a string
prefixLen: prefix length, e.g. 8 for /8 or 16M addrs"""
ipSub = '%s/%d' % ( ip, prefixLen )
result = self.cmd( 'ifconfig', intf, ipSub, 'up' )
self.ips[ intf ] = ip
return result
def setHostRoute( self, ip, intf ):
"""Add route to host.
ip: IP address as dotted decimal
intf: string, interface name"""
return self.cmd( 'route add -host ' + ip + ' dev ' + intf )
def setDefaultRoute( self, intf ):
"""Set the default route to go through intf.
intf: string, interface name"""
self.cmd( 'ip route flush root 0/0' )
return self.cmd( 'route add default ' + intf )
def defaultIntf( self ):
"Return interface for lowest port"
ports = self.intfs.keys()
if ports:
return self.intfs[ min( ports ) ]
_ipMatchRegex = re.compile( r'\d+\.\d+\.\d+\.\d+' )
_macMatchRegex = re.compile( r'..:..:..:..:..:..' )
def IP( self, intf=None ):
"Return IP address of a node or specific interface."
if intf is None:
intf = self.defaultIntf()
if intf and not self.waiting:
self.updateIP( intf )
return self.ips.get( intf, None )
def MAC( self, intf=None ):
"Return MAC address of a node or specific interface."
if intf is None:
intf = self.defaultIntf()
if intf and not self.waiting:
self.updateMAC( intf )
return self.macs.get( intf, None )
def updateIP( self, intf ):
"Update IP address for an interface"
assert not self.waiting
ifconfig = self.cmd( 'ifconfig ' + intf )
ips = self._ipMatchRegex.findall( ifconfig )
if ips:
self.ips[ intf ] = ips[ 0 ]
else:
self.ips[ intf ] = None
def updateMAC( self, intf ):
"Update MAC address for an interface"
assert not self.waiting
ifconfig = self.cmd( 'ifconfig ' + intf )
macs = self._macMatchRegex.findall( ifconfig )
if macs:
self.macs[ intf ] = macs[ 0 ]
else:
self.macs[ intf ] = None
def intfIsUp( self, intf ):
"Check if an interface is up."
return 'UP' in self.cmd( 'ifconfig ' + intf )
# Other methods
def __str__( self ):
intfs = sorted( self.intfs.values() )
return '%s: IP=%s intfs=%s pid=%s' % (
self.name, self.IP(), ','.join( intfs ), self.pid )
class Host( Node ):
"A host is simply a Node."
class Switch( Node ):
"""A Switch is a Node that is running (or has execed?)
an OpenFlow switch."""
portBase = SWITCH_PORT_BASE # 0 for OF < 1.0, 1 for OF >= 1.0
def __init__( self, name, opts='', listenPort=None, **kwargs):
Node.__init__( self, name, **kwargs )
self.opts = opts
self.listenPort = listenPort
if self.listenPort:
self.opts += ' --listen=ptcp:%i ' % self.listenPort
def defaultIntf( self ):
"Return interface for HIGHEST port"
ports = self.intfs.keys()
if ports:
intf = self.intfs[ max( ports ) ]
return intf
def sendCmd( self, *cmd, **kwargs ):
"""Send command to Node.
cmd: string"""
kwargs.setdefault( 'printPid', False )
if not self.execed:
return Node.sendCmd( self, *cmd, **kwargs )
else:
error( '*** Error: %s has execed and cannot accept commands' %
self.name )
class UserSwitch( Switch ):
"User-space switch."
def __init__( self, name, **kwargs ):
"""Init.
name: name for the switch"""
Switch.__init__( self, name, **kwargs )
pathCheck( 'ofdatapath', 'ofprotocol',
moduleName='the OpenFlow reference user switch (openflow.org)' )
@staticmethod
def setup():
"Ensure any dependencies are loaded; if not, try to load them."
if not os.path.exists( '/dev/net/tun' ):
moduleDeps( add=TUN )
def start( self, controllers ):
"""Start OpenFlow reference user datapath.
Log to /tmp/sN-{ofd,ofp}.log.
controllers: list of controller objects"""
controller = controllers[ 0 ]
ofdlog = '/tmp/' + self.name + '-ofd.log'
ofplog = '/tmp/' + self.name + '-ofp.log'
self.cmd( 'ifconfig lo up' )
mac_str = ''
if self.defaultMAC:
# ofdatapath expects a string of hex digits with no colons.
mac_str = ' -d ' + ''.join( self.defaultMAC.split( ':' ) )
intfs = sorted( self.intfs.values() )
if self.inNamespace:
intfs = intfs[ :-1 ]
self.cmd( 'ofdatapath -i ' + ','.join( intfs ) +
' punix:/tmp/' + self.name + mac_str + ' --no-slicing ' +
' 1> ' + ofdlog + ' 2> ' + ofdlog + ' &' )
self.cmd( 'ofprotocol unix:/tmp/' + self.name +
' tcp:%s:%d' % ( controller.IP(), controller.port ) +
' --fail=closed ' + self.opts +
' 1> ' + ofplog + ' 2>' + ofplog + ' &' )
def stop( self ):
"Stop OpenFlow reference user datapath."
self.cmd( 'kill %ofdatapath' )
self.cmd( 'kill %ofprotocol' )
self.deleteIntfs()
class KernelSwitch( Switch ):
"""Kernel-space switch.
Currently only works in root namespace."""
def __init__( self, name, dp=None, **kwargs ):
"""Init.
name: name for switch
dp: netlink id (0, 1, 2, ...)
defaultMAC: default MAC as string; random value if None"""
Switch.__init__( self, name, **kwargs )
self.dp = 'nl:%i' % dp
self.intf = 'of%i' % dp
if self.inNamespace:
error( "KernelSwitch currently only works"
" in the root namespace." )
exit( 1 )
@staticmethod
def setup():
"Ensure any dependencies are loaded; if not, try to load them."
pathCheck( 'ofprotocol',
moduleName='the OpenFlow reference kernel switch'
' (openflow.org) (NOTE: not available in OpenFlow 1.0!)' )
moduleDeps( subtract=OVS_KMOD, add=OF_KMOD )
def start( self, controllers ):
"Start up reference kernel datapath."
ofplog = '/tmp/' + self.name + '-ofp.log'
quietRun( 'ifconfig lo up' )
# Delete local datapath if it exists;
# then create a new one monitoring the given interfaces
quietRun( 'dpctl deldp ' + self.dp )
self.cmd( 'dpctl adddp ' + self.dp )
if self.defaultMAC:
self.cmd( 'ifconfig', self.intf, 'hw', 'ether', self.defaultMAC )
ports = sorted( self.ports.values() )
if len( ports ) != ports[ -1 ] + 1 - self.portBase:
raise Exception( 'only contiguous, zero-indexed port ranges'
'supported: %s' % ports )
intfs = [ self.intfs[ port ] for port in ports ]
self.cmd( 'dpctl', 'addif', self.dp, ' '.join( intfs ) )
# Run protocol daemon
controller = controllers[ 0 ]
self.cmd( 'ofprotocol ' + self.dp +
' tcp:%s:%d' % ( controller.IP(), controller.port ) +
' --fail=closed ' + self.opts +
' 1> ' + ofplog + ' 2>' + ofplog + ' &' )
self.execed = False
def stop( self ):
"Terminate kernel datapath."
quietRun( 'dpctl deldp ' + self.dp )
self.cmd( 'kill %ofprotocol' )
self.deleteIntfs()
class OVSKernelSwitch( Switch ):
"""Open VSwitch kernel-space switch.
Currently only works in the root namespace."""
def __init__( self, name, dp=None, **kwargs ):
"""Init.
name: name for switch
dp: netlink id (0, 1, 2, ...)
defaultMAC: default MAC as unsigned int; random value if None"""
Switch.__init__( self, name, **kwargs )
self.dp = 'dp%i' % dp
self.intf = self.dp
if self.inNamespace:
error( "OVSKernelSwitch currently only works"
" in the root namespace.\n" )
exit( 1 )
@staticmethod
def setup():
"Ensure any dependencies are loaded; if not, try to load them."
pathCheck( 'ovs-dpctl', 'ovs-openflowd',
moduleName='Open vSwitch (openvswitch.org)')
moduleDeps( subtract=OF_KMOD, add=OVS_KMOD )
def start( self, controllers ):
"Start up kernel datapath."
ofplog = '/tmp/' + self.name + '-ofp.log'
quietRun( 'ifconfig lo up' )
# Delete local datapath if it exists;
# then create a new one monitoring the given interfaces
quietRun( 'ovs-dpctl del-dp ' + self.dp )
self.cmd( 'ovs-dpctl add-dp ' + self.dp )
mac_str = ''
if self.defaultMAC:
# ovs-openflowd expects a string of exactly 16 hex digits with no
# colons.
mac_str = ' --datapath-id=0000' + \
''.join( self.defaultMAC.split( ':' ) ) + ' '
ports = sorted( self.ports.values() )
if len( ports ) != ports[ -1 ] + 1 - self.portBase:
raise Exception( 'only contiguous, one-indexed port ranges '
'supported: %s' % self.intfs )
intfs = [ self.intfs[ port ] for port in ports ]
self.cmd( 'ovs-dpctl', 'add-if', self.dp, ' '.join( intfs ) )
# Run protocol daemon
controller = controllers[ 0 ]
self.cmd( 'ovs-openflowd ' + self.dp +
' tcp:%s:%d' % ( controller.IP(), controller.port ) +
' --fail=secure ' + self.opts + mac_str +
' 1>' + ofplog + ' 2>' + ofplog + '&' )
self.execed = False
def stop( self ):
"Terminate kernel datapath."
quietRun( 'ovs-dpctl del-dp ' + self.dp )
self.cmd( 'kill %ovs-openflowd' )
self.deleteIntfs()
class Controller( Node ):
"""A Controller is a Node that is running (or has execed?) an
OpenFlow controller."""
def __init__( self, name, inNamespace=False, command='controller',
cargs='-v ptcp:%d', cdir=None, defaultIP="127.0.0.1",
port=6633 ):
self.command = command
self.cargs = cargs
self.cdir = cdir
self.port = port
Node.__init__( self, name, inNamespace=inNamespace,
defaultIP=defaultIP )
def start( self ):
"""Start <controller> <args> on controller.
Log to /tmp/cN.log"""
pathCheck( self.command )
cout = '/tmp/' + self.name + '.log'
if self.cdir is not None:
self.cmd( 'cd ' + self.cdir )
self.cmd( self.command + ' ' + self.cargs % self.port +
' 1>' + cout + ' 2>' + cout + '&' )
self.execed = False
def stop( self ):
"Stop controller."
self.cmd( 'kill %' + self.command )
self.terminate()
def IP( self, intf=None ):
"Return IP address of the Controller"
ip = Node.IP( self, intf=intf )
if ip is None:
ip = self.defaultIP
return ip
class ControllerParams( object ):
"Container for controller IP parameters."
def __init__( self, ip, prefixLen ):
"""Init.
ip: string, controller IP address
prefixLen: prefix length, e.g. 8 for /8, covering 16M"""
self.ip = ip
self.prefixLen = prefixLen
class NOX( Controller ):
"Controller to run a NOX application."
def __init__( self, name, noxArgs=None, **kwargs ):
"""Init.
name: name to give controller
noxArgs: list of args, or single arg, to pass to NOX"""
if not noxArgs:
noxArgs = [ 'packetdump' ]
elif type( noxArgs ) != list:
noxArgs = [ noxArgs ]
if 'NOX_CORE_DIR' not in os.environ:
exit( 'exiting; please set missing NOX_CORE_DIR env var' )
noxCoreDir = os.environ[ 'NOX_CORE_DIR' ]
Controller.__init__( self, name,
command=noxCoreDir + '/nox_core',
cargs='--libdir=/usr/local/lib -v -i ptcp:%s ' +
' '.join( noxArgs ),
cdir=noxCoreDir, **kwargs )
class RemoteController( Controller ):
"Controller running outside of Mininet's control."
def __init__( self, name, defaultIP='127.0.0.1',
port=6633, **kwargs):
"""Init.
name: name to give controller
defaultIP: the IP address where the remote controller is
listening
port: the port where the remote controller is listening"""
Controller.__init__( self, name, defaultIP=defaultIP, port=port,
**kwargs )
def start( self ):
"Overridden to do nothing."
return
def stop( self ):
"Overridden to do nothing."
return