8000 mininet/mininet/link.py at devel/nattedtopo · gityzhu/mininet · GitHub
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link.py

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( [ '%s delay' % delay ] if delay is not None else [] ) +
( [ '%s jitter' % jitter ] if jitter is not None else [] ) +
( ['%d%% loss' % loss ] if loss is not None else [] ) +
( [ 'ECN' ] if enable_ecn else [ 'RED' ]
if enable_red else [] ) )
info( '(' + ' '.join( stuff ) + ') ' )
# Execute all the commands in our node
debug("at map stage w/cmds: %s\n" % cmds)
tcoutputs = [ self.tc(cmd) for cmd in cmds ]
for output in tcoutputs:
if output != '':
error( "*** Error: %s" % output )
debug( "cmds:", cmds, '\n' )
debug( "outputs:", tcoutputs, '\n' )
result[ 'tcoutputs'] = tcoutputs
result[ 'parent' ] = parent
return result
class Link( object ):
"""A basic link is just a veth pair.
Other types of links could be tunnels, link emulators, etc.."""
# pylint: disable=too-many-branches
def __init__( self, node1, node2, port1=None, port2=None,
intfName1=None, intfName2=None, addr1=None, addr2=None,
intf=Intf, cls1=None, cls2=None, params1=None,
params2=None, fast=True ):
"""Create veth link to another node, making two new interfaces.
node1: first node
node2: second node
port1: node1 port number (optional)
port2: node2 port number (optional)
intf: default interface class/constructor
cls1, cls2: optional interface-specific constructors
intfName1: node1 interface name (optional)
intfName2: node2 interface name (optional)
params1: parameters for interface 1
params2: parameters for interface 2"""
# This is a bit awkward; it seems that having everything in
# params is more orthogonal, but being able to specify
# in-line arguments is more convenient! So we support both.
if params1 is None:
params1 = {}
if params2 is None:
params2 = {}
# Allow passing in params1=params2
if params2 is params1:
params2 = dict( params1 )
if port1 is not None:
params1[ 'port' ] = port1
if port2 is not None:
params2[ 'port' ] = port2
if 'port' not in params1:
params1[ 'port' ] = node1.newPort()
if 'port' not in params2:
params2[ 'port' ] = node2.newPort()
if not intfName1:
intfName1 = self.intfName( node1, params1[ 'port' ] )
if not intfName2:
intfName2 = self.intfName( node2, params2[ 'port' ] )
self.fast = fast
if fast:
params1.setdefault( 'moveIntfFn', self._ignore )
params2.setdefault( 'moveIntfFn', self._ignore )
self.makeIntfPair( intfName1, intfName2, addr1, addr2,
node1, node2, deleteIntfs=False )
else:
self.makeIntfPair( intfName1, intfName2, addr1, addr2 )
if not cls1:
cls1 = intf
if not cls2:
cls2 = intf
intf1 = cls1( name=intfName1, node=node1,
link=self, mac=addr1, **params1 )
intf2 = cls2( name=intfName2, node=node2,
link=self, mac=addr2, **params2 )
# All we are is dust in the wind, and our two interfaces
self.intf1, self.intf2 = intf1, intf2
# pylint: enable=too-many-branches
@staticmethod
def _ignore( *args, **kwargs ):
"Ignore any arguments"
pass
def intfName( self, node, n ):
"Construct a canonical interface name node-ethN for interface n."
# Leave this as an instance method for now
assert self
return node.name + '-eth' + repr( n )
@classmethod
def makeIntfPair( cls, intfname1, intfname2, addr1=None, addr2=None,
node1=None, node2=None, deleteIntfs=True ):
"""Create pair of interfaces
intfname1: name for interface 1
intfname2: name for interface 2
addr1: MAC address for interface 1 (optional)
addr2: MAC address for interface 2 (optional)
node1: home node for interface 1 (optional)
node2: home node for interface 2 (optional)
(override this method [and possibly delete()]
to change link type)"""
# Leave this as a class method for now
assert cls
return makeIntfPair( intfname1, intfname2, addr1, addr2, node1, node2,
deleteIntfs=deleteIntfs )
def delete( self ):
"Delete this link"
self.intf1.delete()
# We only need to delete one side, though this doesn't seem to
# cost us much and might help subclasses.
# self.intf2.delete()
< 6904 div>
def stop( self ):
"Override to stop and clean up link as needed"
self.delete()
def status( self ):
"Return link status as a string"
return "(%s %s)" % ( self.intf1.status(), self.intf2.status() )
def __str__( self ):
return '%s<->%s' % ( self.intf1, self.intf2 )
class OVSIntf( Intf ):
"Patch interface on an OVSSwitch"
def ifconfig( self, *args ):
cmd = ' '.join( args )
if cmd == 'up':
# OVSIntf is always up
return
else:
raise Exception( 'OVSIntf cannot do ifconfig ' + cmd )
class OVSLink( Link ):
"""Link that makes patch links between OVSSwitches
Warning: in testing we have found that no more
than ~64 OVS patch links should be used in row."""
def __init__( self, node1, node2, **kwargs ):
"See Link.__init__() for options"
self.isPatchLink = False
if ( isinstance( node1, mininet.node.OVSSwitch ) and
isinstance( node2, mininet.node.OVSSwitch ) ):
self.isPatchLink = True
kwargs.update( cls1=OVSIntf, cls2=OVSIntf )
Link.__init__( self, node1, node2, **kwargs )
def makeIntfPair( self, *args, **kwargs ):
"Usually delegated to OVSSwitch"
if self.isPatchLink:
return None, None
else:
return Link.makeIntfPair( *args, **kwargs )
class TCLink( Link ):
"Link with symmetric TC interfaces configured via opts"
def __init__( self, node1, node2, port1=None, port2=None,
intfName1=None, intfName2=None,
addr1=None, addr2=None, **params ):
Link.__init__( self, node1, node2, port1=port1, port2=port2,
intfName1=intfName1, intfName2=intfName2,
cls1=TCIntf,
cls2=TCIntf,
addr1=addr1, addr2=addr2,
params1=params,
params2=params )
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