Repository navigation
Expand file tree
/
Copy pathnet.py
More file actions
executable file
·854 lines (758 loc) · 32 KB
/
Copy pathnet.py
File metadata and controls
executable file
·854 lines (758 loc) · 32 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
"""
Mininet: A simple networking testbed for OpenFlow/SDN!
author: Bob Lantz (rlantz@cs.stanford.edu)
author: Brandon Heller (brandonh@stanford.edu)
Mininet creates scalable OpenFlow test networks by using
process-based virtualization and network namespaces.
Simulated hosts are created as processes in separate network
namespaces. This allows a complete OpenFlow network to be simulated on
top of a single Linux kernel.
Each host has:
A virtual console (pipes to a shell)
A virtual interfaces (half of a veth pair)
A parent shell (and possibly some child processes) in a namespace
Hosts have a network interface which is configured via ifconfig/ip
link/etc.
This version supports both the kernel and user space datapaths
from the OpenFlow reference implementation (openflowswitch.org)
as well as OpenVSwitch (openvswitch.org.)
In kernel datapath mode, the controller and switches are simply
processes in the root namespace.
Kernel OpenFlow datapaths are instantiated using dpctl(8), and are
attached to the one side of a veth pair; the other side resides in the
host namespace. In this mode, switch processes can simply connect to the
controller via the loopback interface.
In user datapath mode, the controller and switches can be full-service
nodes that live in their own network namespaces and have management
interfaces and IP addresses on a control network (e.g. 192.168.123.1,
currently routed although it could be bridged.)
In addition to a management interface, user mode switches also have
several switch interfaces, halves of veth pairs whose other halves
reside in the host nodes that the switches are connected to.
Consistent, straightforward naming is important in order to easily
identify hosts, switches and controllers, both from the CLI and
from program code. Interfaces are named to make it easy to identify
which interfaces belong to which node.
The basic naming scheme is as follows:
Host nodes are named h1-hN
Switch nodes are named s1-sN
Controller nodes are named c0-cN
Interfaces are named {nodename}-eth0 .. {nodename}-ethN
Note: If the network topology is created using mininet.topo, then
node numbers are unique among hosts and switches (e.g. we have
h1..hN and SN..SN+M) and also correspond to their default IP addresses
of 10.x.y.z/8 where x.y.z is the base-256 representation of N for
hN. This mapping allows easy determination of a node's IP
address from its name, e.g. h1 -> 10.0.0.1, h257 -> 10.0.1.1.
Note also that 10.0.0.1 can often be written as 10.1 for short, e.g.
"ping 10.1" is equivalent to "ping 10.0.0.1".
Currently we wrap the entire network in a 'mininet' object, which
constructs a simulated network based on a network topology created
using a topology object (e.g. LinearTopo) from mininet.topo or
mininet.topolib, and a Controller which the switches will connect
to. Several configuration options are provided for functions such as
automatically setting MAC addresses, populating the ARP table, or
even running a set of terminals to allow direct interaction with nodes.
After the network is created, it can be started using start(), and a
variety of useful tasks maybe performed, including basic connectivity
and bandwidth tests and running the mininet CLI.
Once the network is up and running, test code can easily get access
to host and switch objects which can then be used for arbitrary
experiments, typically involving running a series of commands on the
hosts.
After all desired tests or activities have been completed, the stop()
method may be called to shut down the network.
"""
import os
import re
import select
import signal
import copy
from time import sleep
from itertools import chain, groupby
from mininet.cli import CLI
from mininet.log import info, error, debug, output, warn
from mininet.node import Host, OVSKernelSwitch, Controller
from mininet.link import Link, Intf
from mininet.util import quietRun, fixLimits, numCores, ensureRoot
from mininet.util import macColonHex, ipStr, ipParse, netParse, ipAdd
from mininet.term import cleanUpScreens, makeTerms
# Mininet version: should be consistent with README and LICENSE
VERSION = "2.1.0+"
class Mininet( object ):
"Network emulation with hosts spawned in network namespaces."
def __init__( self, topo=None, switch=OVSKernelSwitch, host=Host,
controller=Controller, link=Link, intf=Intf,
build=True, xterms=False, cleanup=False, ipBase='10.0.0.0/8',
inNamespace=False,
autoSetMacs=False, autoStaticArp=False, autoPinCpus=False,
listenPort=None, waitConnected=False ):
"""Create Mininet object.
topo: Topo (topology) object or None
switch: default Switch class
host: default Host class/constructor
controller: default Controller class/constructor
link: default Link class/constructor
intf: default Intf class/constructor
ipBase: base IP address for hosts,
build: build now from topo?
xterms: if build now, spawn xterms?
cleanup: if build now, cleanup before creating?
inNamespace: spawn switches and controller in net namespaces?
autoSetMacs: set MAC addrs automatically like IP addresses?
autoStaticArp: set all-pairs static MAC addrs?
autoPinCpus: pin hosts to (real) cores (requires CPULimitedHost)?
listenPort: base listening port to open; will be incremented for
each additional switch in the net if inNamespace=False"""
self.topo = topo
self.switch = switch
self.host = host
self.controller = controller
self.link = link
self.intf = intf
self.ipBase = ipBase
self.ipBaseNum, self.prefixLen = netParse( self.ipBase )
self.nextIP = 1 # start for address allocation
self.inNamespace = inNamespace
self.xterms = xterms
self.cleanup = cleanup
self.autoSetMacs = autoSetMacs
self.autoStaticArp = autoStaticArp
self.autoPinCpus = autoPinCpus
self.numCores = numCores()
self.nextCore = 0 # next core for pinning hosts to CPUs
self.listenPort = listenPort
self.waitConn = waitConnected
self.hosts = []
self.switches = []
self.controllers = []
self.nameToNode = {} # name to Node (Host/Switch) objects
self.terms = [] # list of spawned xterm processes
Mininet.init() # Initialize Mininet if necessary
self.built = False
if topo and build:
self.build()
def waitConnected( self, timeout=None, delay=.5 ):
"""wait for each switch to connect to a controller,
up to 5 seconds
timeout: time to wait, or None to wait indefinitely
delay: seconds to sleep per iteration
returns: True if all switches are connected"""
info( '*** Waiting for switches to connect\n' )
time = 0
remaining = list( self.switches )
while True:
for switch in tuple( remaining ):
if switch.connected():
info( '%s ' % switch )
remaining.remove( switch )
if not remaining:
info( '\n' )
return True
if time > timeout and timeout is not None:
break
sleep( delay )
time += delay
warn( 'Timed out after %d seconds\n' % time )
for switch in remaining:
if not switch.connected():
warn( 'Warning: %s is not connected to a controller\n'
% switch.name )
else:
remaining.remove( switch )
return not remaining
def addHost( self, name, cls=None, **params ):
"""Add host.
name: name of host to add
cls: custom host class/constructor (optional)
params: parameters for host
returns: added host"""
# Default IP and MAC addresses
defaults = { 'ip': ipAdd( self.nextIP,
ipBaseNum=self.ipBaseNum,
prefixLen=self.prefixLen ) +
'/%s' % self.prefixLen }
if self.autoSetMacs:
defaults[ 'mac'] = macColonHex( self.nextIP )
if self.autoPinCpus:
defaults[ 'cores' ] = self.nextCore
self.nextCore = ( self.nextCore + 1 ) % self.numCores
self.nextIP += 1
defaults.update( params )
if not cls:
cls = self.host
h = cls( name, **defaults )
self.hosts.append( h )
self.nameToNode[ name ] = h
return h
def addSwitch( self, name, cls=None, **params ):
"""Add switch.
name: name of switch to add
cls: custom switch class/constructor (optional)
returns: added switch
side effect: increments listenPort ivar ."""
defaults = { 'listenPort': self.listenPort,
'inNamespace': self.inNamespace }
defaults.update( params )
if not cls:
cls = self.switch
sw = cls( name, **defaults )
if not self.inNamespace and self.listenPort:
self.listenPort += 1
self.switches.append( sw )
self.nameToNode[ name ] = sw
return sw
def addController( self, name='c0', controller=None, **params ):
"""Add controller.
controller: Controller class"""
# Get controller class
if not controller:
controller = self.controller
# Construct new controller if one is not given
if isinstance( name, Controller ):
controller_new = name
# Pylint thinks controller is a str()
# pylint: disable=E1103
name = controller_new.name
# pylint: enable=E1103
else:
controller_new = controller( name, **params )
# Add new controller to net
if controller_new: # allow controller-less setups
self.controllers.append( controller_new )
self.nameToNode[ name ] = controller_new
return controller_new
# BL: We now have four ways to look up nodes
# This may (should?) be cleaned up in the future.
def getNodeByName( self, *args ):
"Return node(s) with given name(s)"
if len( args ) == 1:
return self.nameToNode[ args[ 0 ] ]
return [ self.nameToNode[ n ] for n in args ]
def get( self, *args ):
"Convenience alias for getNodeByName"
return self.getNodeByName( *args )
# Even more convenient syntax for node lookup and iteration
def __getitem__( self, key ):
"""net [ name ] operator: Return node(s) with given name(s)"""
return self.nameToNode[ key ]
def __iter__( self ):
"return iterator over node names"
for node in chain( self.hosts, self.switches, self.controllers ):
yield node.name
def __len__( self ):
"returns number of nodes in net"
return ( len( self.hosts ) + len( self.switches ) +
len( self.controllers ) )
def __contains__( self, item ):
"returns True if net contains named node"
return item in self.nameToNode
<
8000
div>
def keys( self ):
"return a list of all node names or net's keys"
return list( self )
def values( self ):
"return a list of all nodes or net's values"
return [ self[name] for name in self ]
def items( self ):
"return (key,value) tuple list for every node in net"
return zip( self.keys(), self.values() )
def addLink( self, node1, node2, port1=None, port2=None,
cls=None, **params ):
""""Add a link from node1 to node2
node1: source node
node2: dest node
port1: source port
port2: dest port
returns: link object"""
defaults = { 'port1': port1,
'port2': port2,
'intf': self.intf }
defaults.update( params )
if not cls:
cls = self.link
return cls( node1, node2, **defaults )
def configHosts( self ):
"Configure a set of hosts."
for host in self.hosts:
info( host.name + ' ' )
intf = host.defaultIntf()
if intf:
host.configDefault()
else:
# Don't configure nonexistent intf
host.configDefault( ip=None, mac=None )
# You're low priority, dude!
# BL: do we want to do this here or not?
# May not make sense if we have CPU lmiting...
# quietRun( 'renice +18 -p ' + repr( host.pid ) )
# This may not be the right place to do this, but
# it needs to be done somewhere.
host.cmd( 'ifconfig lo up' )
info( '\n' )
def buildFromTopo( self, topo=None ):
"""Build mininet from a topology object
At the end of this function, everything should be connected
and up."""
# Possibly we should clean up here and/or validate
# the topo
if self.cleanup:
pass
info( '*** Creating network\n' )
if not self.controllers and self.controller:
# Add a default controller
info( '*** Adding controller\n' )
classes = self.controller
if type( classes ) is not list:
classes = [ classes ]
for i, cls in enumerate( classes ):
# Allow Controller objects because nobody understands partial()
if isinstance( cls, Controller ):
self.addController( cls )
else:
self.addController( 'c%d' % i, cls )
info( '*** Adding hosts:\n' )
for hostName in topo.hosts():
self.addHost( hostName, **topo.nodeInfo( hostName ) )
info( hostName + ' ' )
info( '\n*** Adding switches:\n' )
for switchName in topo.switches():
self.addSwitch( switchName, **topo.nodeInfo( switchName) )
info( switchName + ' ' )
info( '\n*** Adding links:\n' )
for srcName, dstName in topo.links(sort=True):
src, dst = self.nameToNode[ srcName ], self.nameToNode[ dstName ]
params = topo.linkInfo( srcName, dstName )
srcPort, dstPort = topo.port( srcName, dstName )
self.addLink( src, dst, srcPort, dstPort, **params )
info( '(%s, %s) ' % ( src.name, dst.name ) )
info( '\n' )
def configureControlNetwork( self ):
"Control net config hook: override in subclass"
raise Exception( 'configureControlNetwork: '
'should be overriden in subclass', self )
def build( self ):
"Build mininet."
if self.topo:
self.buildFromTopo( self.topo )
if self.inNamespace:
self.configureControlNetwork()
info( '*** Configuring hosts\n' )
self.configHosts()
if self.xterms:
self.startTerms()
if self.autoStaticArp:
self.staticArp()
self.built = True
def startTerms( self ):
"Start a terminal for each node."
if 'DISPLAY' not in os.environ:
error( "Error starting terms: Cannot connect to display\n" )
return
info( "*** Running terms on %s\n" % os.environ[ 'DISPLAY' ] )
cleanUpScreens()
self.terms += makeTerms( self.controllers, 'controller' )
self.terms += makeTerms( self.switches, 'switch' )
self.terms += makeTerms( self.hosts, 'host' )
def stopXterms( self ):
"Kill each xterm."
for term in self.terms:
os.kill( term.pid, signal.SIGKILL )
cleanUpScreens()
def staticArp( self ):
"Add all-pairs ARP entries to remove the need to handle broadcast."
for src in self.hosts:
for dst in self.hosts:
if src != dst:
src.setARP( ip=dst.IP(), mac=dst.MAC() )
def start( self ):
"Start controller and switches."
if not self.built:
self.build()
info( '*** Starting controller\n' )
for controller in self.controllers:
controller.start()
info( '*** Starting %s switches\n' % len( self.switches ) )
for switch in self.switches:
info( switch.name + ' ')
switch.start( self.controllers )
info( '\n' )
if self.waitConn:
self.waitConnected()
def stop( self ):
"Stop the controller(s), switches and hosts"
info( '*** Stopping %i controllers\n' % len( self.controllers ) )
for controller in self.controllers:
info( controller.name + ' ' )
controller.stop()
info( '\n' )
if self.terms:
info( '*** Stopping %i terms\n' % len( self.terms ) )
self.stopXterms()
info( '*** Stopping %i switches\n' % len( self.switches ) )
for swclass, switches in groupby( sorted( self.switches, key=type ), type ):
if hasattr( swclass, 'batchShutdown' ):
swclass.batchShutdown( switches )
for switch in self.switches:
info( switch.name + ' ' )
switch.stop()
info( '\n' )
info( '*** Stopping %i hosts\n' % len( self.hosts ) )
for host in self.hosts:
info( host.name + ' ' )
host.terminate()
info( '\n*** Done\n' )
def run( self, test, *args, **kwargs ):
"Perform a complete start/test/stop cycle."
self.start()
info( '*** Running test\n' )
result = test( *args, **kwargs )
self.stop()
return result
def monitor( self, hosts=None, timeoutms=-1 ):
"""Monitor a set of hosts (or all hosts by default),
and return their output, a line at a time.
hosts: (optional) set of hosts to monitor
timeoutms: (optional) timeout value in ms
returns: iterator which returns host, line"""
if hosts is None:
hosts = self.hosts
poller = select.poll()
Node = hosts[ 0 ] # so we can call class method fdToNode
for host in hosts:
poller.register( host.stdout )
while True:
ready = poller.poll( timeoutms )
for fd, event in ready:
host = Node.fdToNode( fd )
if event & select.POLLIN:
line = host.readline()
if line is not None:
yield host, line
# Return if non-blocking
if not ready and timeoutms >= 0:
yield None, None
# XXX These test methods should be moved out of this class.
# Probably we should create a tests.py for them
@staticmethod
def _parsePing( pingOutput ):
"Parse ping output and return packets sent, received."
# Check for downed link
if 'connect: Network is unreachable' in pingOutput:
return 1, 0
r = r'(\d+) packets transmitted, (\d+) received'
m = re.search( r, pingOutput )
if m is None:
error( '*** Error: could not parse ping output: %s\n' %
pingOutput )
return 1, 0
sent, received = int( m.group( 1 ) ), int( m.group( 2 ) )
return sent, received
def ping( self, hosts=None, timeout=None ):
"""Ping between all specified hosts.
hosts: list of hosts
timeout: time to wait for a response, as string
returns: ploss packet loss percentage"""
# should we check if running?
packets = 0
lost = 0
ploss = None
if not hosts:
hosts = self.hosts
output( '*** Ping: testing ping reachability\n' )
for node in hosts:
output( '%s -> ' % node.name )
for dest in hosts:
if node != dest:
opts = ''
if timeout:
opts = '-W %s' % timeout
result = node.cmd( 'ping -c1 %s %s' % (opts, dest.IP()) )
sent, received = self._parsePing( result )
packets += sent
if received > sent:
error( '*** Error: received too many packets' )
error( '%s' % result )
node.cmdPrint( 'route' )
exit( 1 )
lost += sent - received
output( ( '%s ' % dest.name ) if received else 'X ' )
output( '\n' )
if packets > 0:
ploss = 100.0 * lost / packets
received = packets - lost
output( "*** Results: %i%% dropped (%d/%d received)\n" %
( ploss, received, packets ) )
else:
ploss = 0
output( "*** Warning: No packets sent\n" )
return ploss
@staticmethod
def _parsePingFull( pingOutput ):
"Parse ping output and return all data."
errorTuple = (1, 0, 0, 0, 0, 0)
# Check for downed link
r = r'[uU]nreachable'
m = re.search( r, pingOutput )
if m is not None:
return errorTuple
r = r'(\d+) packets transmitted, (\d+) received'
m = re.search( r, pingOutput )
if m is None:
error( '*** Error: could not parse ping output: %s\n' %
pingOutput )
return errorTuple
sent, received = int( m.group( 1 ) ), int( m.group( 2 ) )
r = r'rtt min/avg/max/mdev = '
r += r'(\d+\.\d+)/(\d+\.\d+)/(\d+\.\d+)/(\d+\.\d+) ms'
m = re.search( r, pingOutput )
if m is None:
error( '*** Error: could not parse ping output: %s\n' %
pingOutput )
return errorTuple
rttmin = float( m.group( 1 ) )
rttavg = float( m.group( 2 ) )
rttmax = float( m.group( 3 ) )
rttdev = float( m.group( 4 ) )
return sent, received, rttmin, rttavg, rttmax, rttdev
def pingFull( self, hosts=None, timeout=None ):
"""Ping between all specified hosts and return all data.
hosts: list of hosts
timeout: time to wait for a response, as string
returns: all ping data; see function body."""
# should we check if running?
# Each value is a tuple: (src, dsd, [all ping outputs])
all_outputs = []
if not hosts:
hosts = self.hosts
output( '*** Ping: testing ping reachability\n' )
for node in hosts:
output( '%s -> ' % node.name )
for dest in hosts:
if node != dest:
opts = ''
if timeout:
opts = '-W %s' % timeout
result = node.cmd( 'ping -c1 %s %s' % (opts, dest.IP()) )
outputs = self._parsePingFull( result )
sent, received, rttmin, rttavg, rttmax, rttdev = outputs
all_outputs.append( (node, dest, outputs) )
output( ( '%s ' % dest.name ) if received else 'X ' )
output( '\n' )
output( "*** Results: \n" )
for outputs in all_outputs:
src, dest, ping_outputs = outputs
sent, received, rttmin, rttavg, rttmax, rttdev = ping_outputs
output( " %s->%s: %s/%s, " % (src, dest, sent, received ) )
output( "rtt min/avg/max/mdev %0.3f/%0.3f/%0.3f/%0.3f ms\n" %
(rttmin, rttavg, rttmax, rttdev) )
return all_outputs
def pingAll( self, timeout=None ):
"""Ping between all hosts.
returns: ploss packet loss percentage"""
return self.ping( timeout=timeout )
def pingPair( self ):
"""Ping between first two hosts, useful for testing.
returns: ploss packet loss percentage"""
hosts = [ self.hosts[ 0 ], self.hosts[ 1 ] ]
return self.ping( hosts=hosts )
def pingAllFull( self ):
"""Ping between all hosts.
returns: ploss packet loss percentage"""
return self.pingFull()
def pingPairFull( self ):
"""Ping between first two hosts, useful for testing.
returns: ploss packet loss percentage"""
hosts = [ self.hosts[ 0 ], self.hosts[ 1 ] ]
return self.pingFull( hosts=hosts )
@staticmethod
def _parseIperf( iperfOutput ):
"""Parse iperf output and return bandwidth.
iperfOutput: string
returns: result string"""
r = r'([\d\.]+ \w+/sec)'
m = re.findall( r, iperfOutput )
if m:
return m[-1]
else:
# was: raise Exception(...)
error( 'could not parse iperf output: ' + iperfOutput )
return ''
# XXX This should be cleaned up
def iperf( self, hosts=None, l4Type='TCP', udpBw='10M', format=None ):
"""Run iperf between two hosts.
hosts: list of hosts; if None, uses opposite hosts
l4Type: string, one of [ TCP, UDP ]
returns: results two-element array of server and client speeds"""
if not quietRun( 'which telnet' ):
error( 'Cannot find telnet in $PATH - required for iperf test' )
return
if not hosts:
hosts = [ self.hosts[ 0 ], self.hosts[ -1 ] ]
else:
assert len( hosts ) == 2
client, server = hosts
output( '*** Iperf: testing ' + l4Type + ' bandwidth between ' )
output( "%s and %s\n" % ( client.name, server.name ) )
server.cmd( 'killall -9 iperf' )
iperfArgs = 'iperf '
bwArgs = ''
if l4Type == 'UDP':
iperfArgs += '-u '
bwArgs = '-b ' + udpBw + ' '
elif l4Type != 'TCP':
raise Exception( 'Unexpected l4 type: %s' % l4Type )
if format:
iperfArgs += '-f %s ' %format
server.sendCmd( iperfArgs + '-s', printPid=True )
servout = ''
while server.lastPid is None:
servout += server.monitor()
if l4Type == 'TCP':
while 'Connected' not in client.cmd(
'sh -c "echo A | telnet -e A %s 5001"' % server.IP()):
info( 'Waiting for iperf to start up...' )
sleep(.5)
cliout = client.cmd( iperfArgs + '-t 5 -c ' + server.IP() + ' ' +
bwArgs )
debug( 'Client output: %s\n' % cliout )
server.sendInt()
servout += server.waitOutput()
debug( 'Server output: %s\n' % servout )
result = [ self._parseIperf( servout ), self._parseIperf( cliout ) ]
if l4Type == 'UDP':
result.insert( 0, udpBw )
output( '*** Results: %s\n' % result )
return result
def runCpuLimitTest( self, cpu, duration=5 ):
"""run CPU limit test with 'while true' processes.
cpu: desired CPU fraction of each host
duration: test duration in seconds
returns a single list of measured CPU fractions as floats.
"""
pct = cpu * 100
info('*** Testing CPU %.0f%% bandwidth limit\n' % pct)
hosts = self.hosts
for h in hosts:
h.cmd( 'while true; do a=1; done &' )
pids = [h.cmd( 'echo $!' ).strip() for h in hosts]
pids_str = ",".join(["%s" % pid for pid in pids])
cmd = 'ps -p %s -o pid,%%cpu,args' % pids_str
# It's a shame that this is what pylint prefers
outputs = []
for _ in range( duration ):
sleep( 1 )
outputs.append( quietRun( cmd ).strip() )
for h in hosts:
h.cmd( 'kill %1' )
cpu_fractions = []
for test_output in outputs:
# Split by line. Ignore first line, which looks like this:
# PID %CPU COMMAND\n
for line in test_output.split('\n')[1:]:
r = r'\d+\s*(\d+\.\d+)'
m = re.search( r, line )
if m is None:
error( '*** Error: could not extract CPU fraction: %s\n' %
line )
return None
cpu_fractions.append( float( m.group( 1 ) ) )
output( '*** Results: %s\n' % cpu_fractions )
return cpu_fractions
# BL: I think this can be rewritten now that we have
# a real link class.
def configLinkStatus( self, src, dst, status ):
"""Change status of src <-> dst links.
src: node name
dst: node name
status: string {up, down}"""
if src not in self.nameToNode:
error( 'src not in network: %s\n' % src )
elif dst not in self.nameToNode:
error( 'dst not in network: %s\n' % dst )
else:
if type( src ) is str:
src = self.nameToNode[ src ]
if type( dst ) is str:
dst = self.nameToNode[ dst ]
connections = src.connectionsTo( dst )
if len( connections ) == 0:
error( 'src and dst not connected: %s %s\n' % ( src, dst) )
for srcIntf, dstIntf in connections:
result = srcIntf.ifconfig( status )
if result:
error( 'link src status change failed: %s\n' % result )
result = dstIntf.ifconfig( status )
if result:
error( 'link dst status change failed: %s\n' % result )
def interact( self ):
"Start network and run our simple CLI."
self.start()
result = CLI( self )
self.stop()
return result
inited = False
@classmethod
def init( cls ):
"Initialize Mininet"
if cls.inited:
return
ensureRoot()
fixLimits()
cls.inited = True
class MininetWithControlNet( Mininet ):
"""Control network support:
Create an explicit control network. Currently this is only
used/usable with the user datapath.
Notes:
1. If the controller and switches are in the same (e.g. root)
namespace, they can just use the loopback connection.
2. If we can get unix domain sockets to work, we can use them
instead of an explicit control network.
3. Inst
6511
ead of routing, we could bridge or use 'in-band' control.
4. Even if we dispense with this in general, it could still be
useful for people who wish to simulate a separate control
network (since real networks may need one!)
5. Basically nobody ever used this code, so it has been moved
into its own class.
6. Ultimately we may wish to extend this to allow us to create a
control network which every node's control interface is
attached to."""
def configureControlNetwork( self ):
"Configure control network."
self.configureRoutedControlNetwork()
# We still need to figure out the right way to pass
# in the control network location.
def configureRoutedControlNetwork( self, ip='192.168.123.1',
prefixLen=16 ):
"""Configure a routed control network on controller and switches.
For use with the user datapath only right now."""
controller = self.controllers[ 0 ]
info( controller.name + ' <->' )
cip = ip
snum = ipParse( ip )
for switch in self.switches:
info( ' ' + switch.name )
link = self.link( switch, controller, port1=0 )
sintf, cintf = link.intf1, link.intf2
switch.controlIntf = sintf
snum += 1
while snum & 0xff in [ 0, 255 ]:
snum += 1
sip = ipStr( snum )
cintf.setIP( cip, prefixLen )
sintf.setIP( sip, prefixLen )
controller.setHostRoute( sip, cintf )
switch.setHostRoute( cip, sintf )
info( '\n' )
info( '*** Testing control network\n' )
while not cintf.isUp():
info( '*** Waiting for', cintf, 'to come up\n' )
sleep( 1 )
for switch in self.switches:
while not sintf.isUp():
info( '*** Waiting for', sintf, 'to come up\n' )
sleep( 1 )
if self.ping( hosts=[ switch, controller ] ) != 0:
error( '*** Error: control network test failed\n' )
exit( 1 )
info( '\n' )