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Switch.py
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Switch.py
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import json
import os
from threading import Thread, Timer
from operator import attrgetter
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER, DEAD_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_3
from ryu.lib.packet import packet
from ryu.lib.packet import ethernet
from ryu.lib.packet import ether_types
from ryu.lib import hub
PATH = os.path.dirname(__file__)
class SimpleSwitch13(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSwitch13, self).__init__(*args, **kwargs)
self.mac_to_port = {}
self.src_to_meter = {}
self.meter_to_src = {}
self.n_meter = {}
self.port_to_meter = {}
with open(PATH + '/subs.json') as data_file:
self.subs = json.load(data_file)
self.max_rate = 40000
self.default_rate = 2000
self.sleep = 10
self.rate_request = {}
self.rate_allocated = {}
self.rate_used = {}
self.rate_used_mod = {}
self.datapaths = {}
self.monitor_thread = hub.spawn(self._monitor)
self.meter_speed = {}
self.meter_prev = {}
self.time_prev = {}
@set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
def _switch_features_handler(self, ev):
datapath = ev.msg.datapath
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
# install table-miss flow entry
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
match = parser.OFPMatch()
self._add_flow(datapath, 0, match, actions, 1)
# add resubmit flow
inst = [parser.OFPInstructionGotoTable(1)]
mod = parser.OFPFlowMod(datapath=datapath, priority=0, match=match,
instructions=inst, table_id=0)
datapath.send_msg(mod)
@set_ev_cls(ofp_event.EventOFPStateChange,
[MAIN_DISPATCHER, DEAD_DISPATCHER])
def _state_change_handler(self, ev):
datapath = ev.datapath
if ev.state == MAIN_DISPATCHER:
if not datapath.id in self.datapaths:
self.logger.debug('register datapath: %016x', datapath.id)
self.datapaths[datapath.id] = datapath
# Datapath's dictionaries for BW measurement
self.meter_speed[datapath.id] = {}
self.meter_prev[datapath.id] = {}
self.time_prev[datapath.id] = {}
# Switch's dictionaries
self.n_meter[datapath.id] = 0
self.mac_to_port[datapath.id] = {}
self.src_to_meter[datapath.id] = {}
self.port_to_meter[datapath.id] = {}
self.meter_to_src[datapath.id] = {}
self.rate_request[datapath.id] = {}
self.rate_allocated[datapath.id] = {}
self.rate_used[datapath.id] = {}
self.rate_used_mod[datapath.id] = {}
elif ev.state == DEAD_DISPATCHER:
if datapath.id in self.datapaths:
self.logger.debug('unregister datapath: %016x', datapath.id)
# Deleting datapath's dictionaries
del self.datapaths[datapath.id]
del self.meter_speed[datapath.id]
del self.meter_prev[datapath.id]
del self.time_prev[datapath.id]
# Deleting switch's dictionaries
del self.mac_to_port[datapath.id]
del self.n_meter[datapath.id]
del self.src_to_meter[datapath.id]
del self.port_to_meter[datapath.id]
del self.meter_to_src[datapath.id]
del self.rate_request[datapath.id]
del self.rate_allocated[datapath.id]
del self.rate_used[datapath.id]
del self.rate_used_mod[datapath.id]
def _monitor(self):
while True:
for dp in self.datapaths.values():
self._request_stats(dp)
hub.sleep(self.sleep)
def _get_speed(self, now, pre, period):
return 8*((now-pre)/(period*1000.0))
def _request_stats(self, datapath):
self.logger.debug('send stats request: %016x', datapath.id)
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
req = parser.OFPMeterStatsRequest(datapath, 0, ofproto.OFPM_ALL)
datapath.send_msg(req)
@set_ev_cls(ofp_event.EventOFPMeterStatsReply, MAIN_DISPATCHER)
def _meter_stats_reply_handler(self, ev):
body = ev.msg.body
dpid = ev.msg.datapath.id
self.logger.info('datapath meter_id kbps ')
self.logger.info('---------------- -------- --------')
modified_ports = []
for stat in sorted(body, key=attrgetter('meter_id')):
if stat.meter_id in self.time_prev[dpid]:
sleep = float(stat.duration_sec) + (stat.duration_nsec / 10.0**9) - self.time_prev[dpid][stat.meter_id]
self.meter_speed[dpid][stat.meter_id] = self._get_speed(stat.byte_in_count, self.meter_prev[dpid][stat.meter_id], sleep)
else:
self.meter_speed[dpid][stat.meter_id] = 0
self.time_prev[dpid][stat.meter_id] = float(stat.duration_sec) + (stat.duration_nsec / 10.0**9)
self.meter_prev[dpid][stat.meter_id] = stat.byte_in_count
self.logger.info("%016x %08x %6.1f",dpid, stat.meter_id, self.meter_speed[dpid][stat.meter_id])
if stat.meter_id in self.meter_to_src[dpid]:
src = self.meter_to_src[dpid][stat.meter_id]
port = self.mac_to_port[dpid][src]
self.rate_used[dpid].setdefault(port, {})
self.rate_used_mod[dpid].setdefault(port, {})
self.rate_used[dpid][port][src] = self.meter_speed[dpid][stat.meter_id]
if (self.rate_used[dpid][port][src] >= int(self.rate_allocated[dpid][port][src]*0.7)
and (self.rate_allocated[dpid][port][src] < self.rate_request[dpid][port][src])):
if int(self.rate_allocated[dpid][port][src]*1.5) < self.rate_request[dpid][port][src]:
self.rate_used_mod[dpid][port][src] = int(self.rate_allocated[dpid][port][src]*1.5)
else:
self.rate_used_mod[dpid][port][src] = self.rate_request[dpid][port][src]
if port not in modified_ports:
modified_ports.append(port)
else:
self.rate_used_mod[dpid][port][src] = self.rate_used[dpid][port][src]
for port in modified_ports:
hub.spawn(self._mod_port_meters, dpid, port)
def _mod_port_meters(self, dpid, in_port):
self.logger.debug('Datapath: %s modifying port %d meters', dpid, in_port)
datapath = self.datapaths[dpid]
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
cmd = ofproto.OFPMC_MODIFY
prev_allocated = self.rate_allocated[dpid].get(in_port, {})
self.rate_allocated[dpid][in_port] = self._rate_control(dpid, in_port)
for src in self.rate_allocated[dpid][in_port]:
if prev_allocated.get(src, 0) != self.rate_allocated[dpid][in_port][src]:
rate = self.rate_allocated[dpid][in_port][src]
match = parser.OFPMatch(in_port=self.mac_to_port[dpid][src], eth_src=src)
self._mod_meter_entry(datapath, cmd, self.src_to_meter[dpid][src], rate)
def _mod_meter_entry(self, dp, cmd, meter_id, rate, burst_size = 0):
flags = dp.ofproto.OFPMF_KBPS
bands = [dp.ofproto_parser.OFPMeterBandDrop(rate, burst_size)]
meter_mod = dp.ofproto_parser.OFPMeterMod(dp, cmd, flags, meter_id, bands)
if cmd == dp.ofproto.OFPMC_MODIFY and meter_id in self.time_prev[dp.id]:
self.time_prev[dp.id][meter_id] = 0
self.meter_prev[dp.id][meter_id] = 0
dp.send_msg(meter_mod)
def _add_flow(self, datapath, priority, match, actions, table, idle_to=0, buffer_id=None):
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, table_id=table,
idle_timeout = idle_to)
else:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
match=match, instructions=inst, table_id=table,
idle_timeout = idle_to)
datapath.send_msg(mod)
def _add_qos(self, datapath, priority, match, meter_id, rate, idle_to=0):
self._add_qos_meter(datapath, meter_id, rate)
self._add_qos_flow(datapath, priority, match, meter_id, idle_to)
self.logger.debug('qos added')
def _add_qos_meter(self, datapath, meter_id, rate):
ofproto = datapath.ofproto
cmd = ofproto.OFPMC_ADD
self._mod_meter_entry(datapath, cmd, meter_id, rate)
def _add_qos_flow(self, datapath, priority, match, meter_id, idle_to):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
inst = [parser.OFPInstructionMeter(meter_id), parser.OFPInstructionGotoTable(1)]
if idle_to == 0:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority, match=match,
instructions=inst, table_id=0, idle_timeout=idle_to)
else:
mod = parser.OFPFlowMod(datapath=datapath, priority=priority, match=match,
flags=ofproto.OFPFF_SEND_FLOW_REM, instructions=inst,
table_id=0, idle_timeout=idle_to)
datapath.send_msg(mod)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
# If you hit this you might want to increase
# the "miss_send_length" of your switch
if ev.msg.msg_len < ev.msg.total_len:
self.logger.debug("packet truncated: only %s of %s bytes",
ev.msg.msg_len, ev.msg.total_len)
msg = ev.msg
datapath = msg.datapath
dpid = datapath.id
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
# ignore local port (4294967294)
if in_port == 0xfffffffe:
return
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
if eth.ethertype == ether_types.ETH_TYPE_LLDP:
# ignore lldp packet
return
dst = eth.dst
src = eth.src
self.rate_request[dpid].setdefault(in_port, {})
self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
# search if it is from a new in_port
if in_port not in self.port_to_meter[dpid]:
# add in_port's default meter
self.logger.debug('adding qos to port: %s', in_port)
self.n_meter[dpid] += 1
self.port_to_meter[dpid][in_port] = self.n_meter[dpid]
match = parser.OFPMatch(in_port=in_port)
# run thread to avoid performance decreasing
t1 = Timer(0.5, self._add_qos, args=[datapath, 1, match, self.n_meter[dpid], self.default_rate])
t1.start()
# search if there is a rule for the src
if src in self.subs:
# search if there is a existing meter already
if src not in self.src_to_meter[dpid]:
self.n_meter[dpid] += 1
self.src_to_meter[dpid][src] = self.n_meter[dpid]
self.meter_to_src[dpid][self.n_meter[dpid]] = src
t2 = Timer(0.5, self._new_sub, args=[datapath, src, in_port])
t2.start()
# learn a mac address to avoid FLOOD next time.
self.mac_to_port[dpid][src] = in_port
if dst in self.mac_to_port[dpid]:
out_port = self.mac_to_port[dpid][dst]
else:
out_port = ofproto.OFPP_FLOOD
actions = [parser.OFPActionOutput(out_port)]
# install a flow to avoid packet_in next time
if out_port != ofproto.OFPP_FLOOD:
match = parser.OFPMatch(in_port=in_port, eth_src=src, eth_dst=dst)
# verify if we have a valid buffer_id, if yes avoid to send both
# flow_mod & packet_out
if msg.buffer_id != ofproto.OFP_NO_BUFFER:
self._add_flow(datapath, 1, match, actions, 1, idle_to=30, buffer_id=msg.buffer_id)
return
else:
self._add_flow(datapath, 1, match, actions, 1, idle_to=30)
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)
def _new_sub(self, datapath, src, in_port):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
dpid = datapath.id
# recalculate rate allocated to in_port
self.rate_request[dpid][in_port][src] = int(self.subs[src])
prev_allocated = self.rate_allocated[dpid].get(in_port, {})
self.rate_allocated[dpid][in_port] = self._rate_control(dpid, in_port)
# add meter and flow
self.logger.debug('adding qos to src: %s', src)
rate = self.rate_allocated[dpid][in_port][src]
match = parser.OFPMatch(in_port=in_port, eth_src=src)
self._add_qos(datapath, 2, match, self.src_to_meter[dpid][src], rate, 30)
# modify the others in_port's meters
for src2 in self.rate_allocated[dpid][in_port]:
if src != src2 and prev_allocated.get(src2, 0) != self.rate_allocated[dpid][in_port][src2]:
self.logger.debug('modifying qos to src: %s', src2)
cmd = ofproto.OFPMC_MODIFY
rate = self.rate_allocated[dpid][in_port][src2]
match = parser.OFPMatch(in_port=self.mac_to_port[dpid][src2], eth_src=src2)
self._mod_meter_entry(datapath, cmd, self.src_to_meter[dpid][src2], rate)
def _rate_control(self, dpid, in_port):
bandwith = self.max_rate
requested = self.rate_request[dpid][in_port]
used = self.rate_used_mod[dpid].get(in_port, {})
allocated = {}
totalRequested = sum(requested.values())
totalUsed = sum(used.values())
partOfWhole = 0
leftOver = 0
minRate = 2000
K_f = 1.5
R_f = 0.5
if totalRequested < bandwith:
allocated = requested.copy()
leftOver = bandwith - totalRequested
else:
requestedMod = requested.copy()
defaultRate = []
for src in requested:
tmp = int((used.get(src, requested[src]*R_f/K_f)*K_f))
if tmp < requested[src]:
requestedMod[src] = tmp
if requestedMod[src] < minRate:
requestedMod[src] = minRate
defaultRate.append(src)
totalRequested = sum(requestedMod.values())
if totalRequested < bandwith:
allocated = requestedMod
leftOver = bandwith - totalRequested
else:
partOfWhole = int(bandwith/len(requestedMod))
leftOver = bandwith % len(requestedMod)
for src in requestedMod:
if partOfWhole > requestedMod[src]:
allocated[src] = requestedMod[src]
leftOver += partOfWhole - requestedMod[src]
else:
allocated[src] = partOfWhole
while leftOver > 0 and len(defaultRate) != len(allocated):
stillNeed = 0
for src in requestedMod:
if (requested[src] - allocated[src]) > 0:
stillNeed += 1
if stillNeed < leftOver:
for src in requestedMod:
if requested[src] - allocated[src] > 0 and src not in defaultRate:
allocated[src]+=1
leftOver-=1
else:
maxDiff = 0
tempI = ''
for src in requested:
if requested[src] - allocated[src] > maxDiff and src not in defaultRate:
maxDiff = requested[src] - allocated[src]
tempI = src
allocated[tempI] += 1
leftOver -= 1
return allocated
@set_ev_cls(ofp_event.EventOFPFlowRemoved, MAIN_DISPATCHER)
def flow_removed_handler(self, ev):
msg = ev.msg
dp = msg.datapath
dpid = dp.id
ofp = dp.ofproto
parser = dp.ofproto_parser
src = msg.match.get('eth_src', None)
in_port = msg.match.get('in_port', None)
mid = self.src_to_meter[dpid][src]
# deleting dictionaries
del self.meter_speed[dpid][mid]
if mid in self.meter_prev[dpid]:
del self.meter_prev[dpid][mid]
del self.time_prev[dpid][mid]
del self.meter_to_src[dpid][mid]
del self.src_to_meter[dpid][src]
del self.rate_request[dpid][in_port][src]
del self.rate_allocated[dpid][in_port][src]
del self.rate_used[dpid][in_port][src]
del self.rate_used_mod[dpid][in_port][src]
# deleting meter
cmd = ofp.OFPMC_DELETE
self._mod_meter_entry(dp, cmd, mid, 0)
# modifying other meters
self._mod_port_meters(dpid, in_port)
if msg.reason == ofp.OFPRR_IDLE_TIMEOUT:
reason = 'IDLE TIMEOUT'
elif msg.reason == ofp.OFPRR_HARD_TIMEOUT:
reason = 'HARD TIMEOUT'
elif msg.reason == ofp.OFPRR_DELETE:
reason = 'DELETE'
elif msg.reason == ofp.OFPRR_GROUP_DELETE:
reason = 'GROUP DELETE'
else:
reason = 'unknown'
self.logger.debug('OFPFlowRemoved received: '
'cookie=%d priority=%d reason=%s table_id=%d '
'duration_sec=%d duration_nsec=%d '
'idle_timeout=%d hard_timeout=%d '
'packet_count=%d byte_count=%d match.fields=%s',
msg.cookie, msg.priority, reason, msg.table_id,
msg.duration_sec, msg.duration_nsec,
msg.idle_timeout, msg.hard_timeout,
msg.packet_count, msg.byte_count, msg.match)