-
Notifications
You must be signed in to change notification settings - Fork 54
/
ryu_multipath_yens.py
572 lines (482 loc) · 19.7 KB
/
ryu_multipath_yens.py
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
from ryu.base import app_manager
from ryu.controller import mac_to_port
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.mac import haddr_to_bin
from ryu.lib.packet import in_proto
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import arp
from ryu.lib.packet import ipv4
from ryu.lib.packet import ipv6
from ryu.lib.packet import icmp
from ryu.lib.packet import ether_types
from ryu.lib import mac
from ryu.lib import hub
from ryu.lib import ip
from ryu.topology.api import get_switch, get_link
from ryu.app.wsgi import ControllerBase
from ryu.topology import event
from collections import defaultdict
from operator import itemgetter
import os
import random
import time
# Cisco Reference bandwidth = 1 Gbps
REFERENCE_BW = 10000000
DEFAULT_BW = 10000000
MAX_PATHS = float('Inf')
class ProjectController(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(ProjectController, self).__init__(*args, **kwargs)
self.mac_to_port = {}
self.topology_api_app = self
self.datapath_list = {}
self.arp_table = {}
self.switches = []
self.hosts = {}
self.multipath_group_ids = {}
self.group_ids = []
self.adjacency = defaultdict(dict)
self.bandwidths = defaultdict(lambda: defaultdict(lambda: DEFAULT_BW))
# Fake addresses only known to the controller
self.controller_ip = "10.0.0.100"
self.controller_mac = "dd:dd:dd:dd:dd:df"
self.ping_mac = "de:dd:dd:dd:de:dd"
self.ping_ip = "10.0.0.99"
self.delay = defaultdict(lambda: defaultdict(lambda: 0))
self.replied = []
def monitor_link(self, s1, s2):
'''
Monitors link latency between two switches.
Sends ping packet every 0.5 second.
'''
while True:
self.send_ping_packet(s1, s2)
hub.sleep(0.5)
self.logger.info('Stop monitoring link %s %s' % (s1.dpid, s2.dpid))
def monitor_link_controller(self, s1):
'''
Monitors link latency between two switches.
Sends ping packet every 0.5 second.
'''
while True:
self.send_ping_packet_controller(s1)
hub.sleep(0.5)
def send_ping_packet_controller(self, s1):
'''
Send a ping/ICMP packet between two switches.
Uses ryu's packet library.
Uses a fake MAC and IP address only known to controller.
'''
datapath = s1
dst_mac = self.ping_mac
dst_ip = self.ping_ip
out_port = datapath.ofproto.OFPP_CONTROLLER
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=ether_types.ETH_TYPE_IP,
src=self.controller_mac,
dst=dst_mac))
pkt.add_protocol(ipv4.ipv4(proto=in_proto.IPPROTO_ICMP,
src=self.controller_ip,
dst=dst_ip))
echo_payload = '%s;%s;%f' % (s1.id, 0, time.time())
payload = icmp.echo(data=echo_payload)
pkt.add_protocol(icmp.icmp(data=payload))
pkt.serialize()
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath,
buffer_id=datapath.ofproto.OFP_NO_BUFFER,
data=pkt.data,
in_port=datapath.ofproto.OFPP_CONTROLLER,
actions=actions
)
datapath.send_msg(out)
def send_ping_packet(self, s1, s2):
'''
Send a ping/ICMP packet between two switches.
Uses ryu's packet library.
Uses a fake MAC and IP address only known to controller.
'''
datapath = self.datapath_list[int(s1.dpid)]
dst_mac = self.ping_mac
dst_ip = self.ping_ip
out_port = s1.port_no
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
pkt = packet.Packet()
pkt.add_protocol(ethernet.ethernet(ethertype=ether_types.ETH_TYPE_IP,
src=self.controller_mac,
dst=dst_mac))
pkt.add_protocol(ipv4.ipv4(proto=in_proto.IPPROTO_ICMP,
src=self.controller_ip,
dst=dst_ip))
echo_payload = '%s;%s;%f' % (s1.dpid, s2.dpid, time.time())
payload = icmp.echo(data=echo_payload)
pkt.add_protocol(icmp.icmp(data=payload))
pkt.serialize()
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath,
buffer_id=datapath.ofproto.OFP_NO_BUFFER,
data=pkt.data,
in_port=datapath.ofproto.OFPP_CONTROLLER,
actions=actions
)
datapath.send_msg(out)
def ping_packet_handler(self, pkt):
'''
Handler function when ping packet arrives.
Extracts the data from the packet and calculates the latency.
'''
icmp_packet = pkt.get_protocol(icmp.icmp)
echo_payload = icmp_packet.data
payload = echo_payload.data
info = payload.split(';')
s1 = info[0]
s2 = info[1]
latency = (time.time() - float(info[2])) * 1000 # in ms
# print "s%s to s%s latency = %f ms" % (s1, s2, latency)
self.delay[int(s1)][int(s2)] = latency
def minimum_distance(self, distance, Q):
min = float('Inf')
node = 0
for v in Q:
if distance[v] < min:
min = distance[v]
node = v
return node
def path(self, previous, node_start, node_end):
r=[]
p=node_end
r.append(p)
q=previous[p]
while q is not None:
if q == node_start:
r.append(q)
break
p=q
r.append(p)
q=previous[p]
r.reverse()
if node_start==node_end:
path=[node_start]
else:
path=r
return r
def dijkstra(self,graph, node_start, node_end=None):
distances = {}
previous = {}
distances = defaultdict(lambda: float('Inf'))
previous = defaultdict(lambda: None)
distances[node_start]=0
Q=set(switches)
while len(Q)>0:
u = minimum_distance(distances, Q)
Q.remove(u)
for p in switches:
if graph[u][p]!=None:
w = delay[u][p]
if distances[u] + w < distances[p]:
distances[p] = distances[u] + w
previous[p] = u
if node_end:
return {'cost': distances[node_end],
'path': path(previous, node_start, node_end)}
else:
return (distances, previous)
def get_paths(self, src,dst,first_port,final_port,max_k=2):
print "YenKSP is called"
print "src=",src," dst=",dst, " first_port=", first_port, " final_port=", final_port, " max_k=", max_k
adjacency2=defaultdict(lambda:defaultdict(lambda:None))
distances, previous = dijkstra(self.adjacency,src)
A = [{'cost': distances[dst],
'path': path(previous, src, dst)}]
B = []
#print "distances=", distances
#print "previous=", previous
#print "A=", A
if not A[0]['path']: return A
try:
for k in range(1, max_k):
adjacency2=copy.deepcopy(self.adjacency)
#print "k=", k, " adjacency2=", adjacency2
for i in range(0, len(A[-1]['path']) - 1):
node_spur = A[-1]['path'][i]
path_root = A[-1]['path'][:i+1]
#print "node_spur=", node_spur, " path_root=", path_root
for path_k in A:
curr_path = path_k['path']
#print "curr_path=", curr_path, " i=", i
if len(curr_path) > i and path_root == curr_path[:i+1]:
adjacency2[curr_path[i]][curr_path[i+1]]=None
#print "link[", curr_path[i],"][", curr_path[i+1], "] is removed"
path_spur = dijkstra(adjacency2, node_spur, dst)
#print "path_spur=", path_spur
if path_spur['path']:
path_total = path_root[:-1] + path_spur['path']
#print "path_total=", path_total
dist_total = distances[node_spur] + path_spur['cost']
#print "dist_total=", path_total
potential_k = {'cost': dist_total, 'path': path_total}
#print "potential_k=", potential_k
if not (potential_k in B):
B.append(potential_k)
#print "B=", B
if len(B):
B = sorted(B, key=itemgetter('cost'))
#print "after sorting, B=", B
A.append(B[0])
B.pop(0)
#print "after poping out the first element, B=", B, " A=", A
else:
break
except:
pass
tmp=[]
print "YenKSP->"
for path_k in A:
print path_k
tmp.append(path_k)
return map(lambda x: x['path'], A)
def get_link_cost(self, s1, s2):
'''
Get the link cost between two switches
'''
e1 = self.adjacency[s1][s2]
e2 = self.adjacency[s2][s1]
bl = min(self.bandwidths[s1][e1], self.bandwidths[s2][e2])
ew = REFERENCE_BW/bl
return ew
def get_path_cost(self, path):
'''
Get the path cost
'''
cost = 0
for i in range(len(path) - 1):
cost += self.get_link_cost(path[i], path[i+1])
return cost
def get_optimal_paths(self, src, dst):
'''
Get the n-most optimal paths according to MAX_PATHS
'''
paths = self.get_paths(src, dst)
paths_count = len(paths) if len(
paths) < MAX_PATHS else MAX_PATHS
return sorted(paths, key=lambda x: self.get_path_cost(x))[0:(paths_count)]
def add_ports_to_paths(self, paths, first_port, last_port):
'''
Add the ports that connects the switches for all paths
'''
paths_p = []
for path in paths:
p = {}
in_port = first_port
for s1, s2 in zip(path[:-1], path[1:]):
out_port = self.adjacency[s1][s2]
p[s1] = (in_port, out_port)
in_port = self.adjacency[s2][s1]
p[path[-1]] = (in_port, last_port)
paths_p.append(p)
return paths_p
def generate_openflow_gid(self):
'''
Returns a random OpenFlow group id
'''
n = random.randint(0, 2**32)
while n in self.group_ids:
n = random.randint(0, 2**32)
return n
def install_paths(self, src, first_port, dst, last_port, ip_src, ip_dst):
computation_start = time.time()
paths = self.get_paths(src, dst)
pw = []
for path in paths:
pw.append(self.get_path_cost(path))
print path, "cost = ", pw[len(pw) - 1]
sum_of_pw = sum(pw)
paths_with_ports = self.add_ports_to_paths(paths, first_port, last_port)
switches_in_paths = set().union(*paths)
for node in switches_in_paths:
dp = self.datapath_list[node]
ofp = dp.ofproto
ofp_parser = dp.ofproto_parser
ports = defaultdict(list)
actions = []
i = 0
for path in paths_with_ports:
if node in path:
in_port = path[node][0]
out_port = path[node][1]
if (out_port, pw[i]) not in ports[in_port]:
ports[in_port].append((out_port, pw[i]))
i += 1
for in_port in ports:
match_ip = ofp_parser.OFPMatch(
eth_type=0x0800,
ipv4_src=ip_src,
ipv4_dst=ip_dst
)
match_arp = ofp_parser.OFPMatch(
eth_type=0x0806,
arp_spa=ip_src,
arp_tpa=ip_dst
)
out_ports = ports[in_port]
print out_ports
if len(out_ports) > 1:
group_id = None
group_new = False
if (node, src, dst) not in self.multipath_group_ids:
group_new = True
self.multipath_group_ids[
node, src, dst] = self.generate_openflow_gid()
group_id = self.multipath_group_ids[node, src, dst]
buckets = []
# print "node at ",node," out ports : ",out_ports
for port, weight in out_ports:
bucket_weight = int(round((1 - weight/sum_of_pw) * 10))
bucket_action = [ofp_parser.OFPActionOutput(port)]
buckets.append(
ofp_parser.OFPBucket(
weight=bucket_weight,
watch_port=port,
watch_group=ofp.OFPG_ANY,
actions=bucket_action
)
)
if group_new:
req = ofp_parser.OFPGroupMod(
dp, ofp.OFPGC_ADD, ofp.OFPGT_SELECT, group_id,
buckets
)
dp.send_msg(req)
else:
req = ofp_parser.OFPGroupMod(
dp, ofp.OFPGC_MODIFY, ofp.OFPGT_SELECT,
group_id, buckets)
dp.send_msg(req)
actions = [ofp_parser.OFPActionGroup(group_id)]
self.add_flow(dp, 32768, match_ip, actions)
self.add_flow(dp, 1, match_arp, actions)
elif len(out_ports) == 1:
actions = [ofp_parser.OFPActionOutput(out_ports[0][0])]
self.add_flow(dp, 32768, match_ip, actions)
self.add_flow(dp, 1, match_arp, actions)
print "Path installation finished in ", time.time() - computation_start
return paths_with_ports[0][src][1]
def add_flow(self, datapath, priority, match, actions, buffer_id=None):
# print "Adding flow ", match, actions
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
if buffer_id:
mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
priority=priority, match=match,
instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def _switch_features_handler(self, ev):
print "switch_features_handler is called"
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0, match, actions)
@set_ev_cls(ofp_event.EventOFPPortDescStatsReply, MAIN_DISPATCHER)
def port_desc_stats_reply_handler(self, ev):
switch = ev.msg.datapath
for p in ev.msg.body:
self.bandwidths[switch.id][p.port_no] = p.curr_speed
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
pkt = packet.Packet(msg.data)
eth = pkt.get_protocol(ethernet.ethernet)
arp_pkt = pkt.get_protocol(arp.arp)
# avoid broadcast from LLDP
if eth.ethertype == 35020:
return
if pkt.get_protocol(ipv6.ipv6): # Drop the IPV6 Packets.
match = parser.OFPMatch(eth_type=eth.ethertype)
actions = []
self.add_flow(datapath, 1, match, actions)
return None
dst = eth.dst
src = eth.src
dpid = datapath.id
if dst == self.ping_mac:
# ping packet arrives
self.ping_packet_handler(pkt)
return
if src not in self.hosts:
self.hosts[src] = (dpid, in_port)
out_port = ofproto.OFPP_FLOOD
if arp_pkt:
# print dpid, pkt
src_ip = arp_pkt.src_ip
dst_ip = arp_pkt.dst_ip
if arp_pkt.opcode == arp.ARP_REPLY:
self.arp_table[src_ip] = src
h1 = self.hosts[src]
h2 = self.hosts[dst]
out_port = self.install_paths(h1[0], h1[1], h2[0], h2[1], src_ip, dst_ip)
self.install_paths(h2[0], h2[1], h1[0], h1[1], dst_ip, src_ip) # reverse
elif arp_pkt.opcode == arp.ARP_REQUEST:
if dst_ip in self.arp_table:
self.arp_table[src_ip] = src
dst_mac = self.arp_table[dst_ip]
h1 = self.hosts[src]
h2 = self.hosts[dst_mac]
out_port = self.install_paths(h1[0], h1[1], h2[0], h2[1], src_ip, dst_ip)
self.install_paths(h2[0], h2[1], h1[0], h1[1], dst_ip, src_ip) # reverse
print pkt
actions = [parser.OFPActionOutput(out_port)]
data = None
if msg.buffer_id == ofproto.OFP_NO_BUFFER:
data = msg.data
out = parser.OFPPacketOut(
datapath=datapath, buffer_id=msg.buffer_id, in_port=in_port,
actions=actions, data=data)
datapath.send_msg(out)
@set_ev_cls(event.EventSwitchEnter)
def switch_enter_handler(self, event):
switch = event.switch.dp
ofp_parser = switch.ofproto_parser
if switch.id not in self.switches:
self.switches.append(switch.id)
self.datapath_list[switch.id] = switch
# Request port/link descriptions, useful for obtaining bandwidth
req = ofp_parser.OFPPortDescStatsRequest(switch)
switch.send_msg(req)
hub.spawn(self.monitor_link_controller, switch)
@set_ev_cls(event.EventSwitchLeave, MAIN_DISPATCHER)
def switch_leave_handler(self, event):
print event
switch = event.switch.dp.id
if switch in self.switches:
del self.switches[switch]
del self.datapath_list[switch]
del self.adjacency[switch]
@set_ev_cls(event.EventLinkAdd, MAIN_DISPATCHER)
def link_add_handler(self, event):
s1 = event.link.src
s2 = event.link.dst
self.adjacency[s1.dpid][s2.dpid] = s1.port_no
self.adjacency[s2.dpid][s1.dpid] = s2.port_no
hub.spawn(self.monitor_link, s1, s2)
@set_ev_cls(event.EventLinkDelete, MAIN_DISPATCHER)
def link_delete_handler(self, event):
return