def actions_to_ryu(actions, rule):
""" Converts a list of actions to a list of ryu actions
This returns both a instruction list and any extra messages that
are required to install the instructions such as group mod messages.
Currently this is not smart about reusing groups.
actions: A iterable list actions such as ActionSet, ActionList,
or Bucket.
rule: The rule being converted
return: A tuple ([actions], [extra messages])
"""
ret = []
extra_messages = []
for action in actions:
if action[0] == 'OUTPUT':
ret.append(parser.OFPActionOutput(action[1]))
elif action[0] == 'COPY_TTL_OUT':
ret.append(parser.OFPActionCopyTtlOut())
elif action[0] == 'COPY_TTL_IN':
ret.append(parser.OFPActionCopyTtlIn())
elif action[0] == 'SET_MPLS_TTL':
ret.append(parser.OFPActionSetMplsTtl(action[1]))
elif action[0] == 'DEC_MPLS_TTL':
ret.append(parser.OFPActionDecMplsTtl())
elif action[0] == 'PUSH_VLAN':
ret.append(parser.OFPActionPushVlan(action[1]))
elif action[0] == 'POP_VLAN':
ret.append(parser.OFPActionPopVlan())
elif action[0] == 'PUSH_MPLS':
ret.append(parser.OFPActionPushMpls(action[1]))
elif action[0] == 'POP_MPLS':
ret.append(parser.OFPActionPopMpls(action[1]))
elif action[0] == 'SET_QUEUE':
ret.append(parser.OFPActionSetQueue(action[1]))
elif action[0] == 'GROUP':
if isinstance(action[1], Group):
group_id, extra = group_to_ryu(action[1], rule)
ret.append(parser.OFPActionGroup(group_id))
extra_messages += extra
else:
ret.append(parser.OFPActionGroup(action[1]))
elif action[0] == 'SET_NW_TTL':
ret.append(parser.OFPActionSetNwTtl(action[1]))
elif action[0] == 'DEC_NW_TTL':
ret.append(parser.OFPActionDecNwTtl())
elif action[0] == 'SET_FIELD':
set_field = {action[1][0].lower(): action[1][1]}
ret.append(parser.OFPActionSetField(**set_field))
elif action[0] == 'PUSH_PBB':
ret.append(parser.OFPActionPushPbb(action[1]))
elif action[0] == 'POP_PBB':
ret.append(parser.OFPActionPopPbb())
else:
assert not "GGRR"
return (ret, extra_messages)
def flow_example_groups(self, dp):
# a flow to correctly forward all traffic to m1, but implemented using
# group tables
# you can specify multiple buckets, and each bucket can perform multple
# actions
buckets = [
parser.OFPBucket(actions=[parser.OFPActionOutput(4)]),
]
# create the group
# docs: https://ryu.readthedocs.io/en/latest/ofproto_v1_3_ref.html#ryu.ofproto.ofproto_v1_3_parser.OFPGroupMod
dp.send_msg(
parser.OFPGroupMod(dp,
command=ofproto.OFPGC_ADD,
type_=ofproto.OFPGT_SELECT,
group_id=1,
buckets=buckets))
# create a match to send packets to the new group
match = parser.OFPMatch(eth_type=ether_types.ETH_TYPE_IP,
ipv4_dst='44.0.0.0/8')
# you've been using this all along, see: self.program_flow in cockpit.py
instructions = [
parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
[parser.OFPActionGroup(group_id=1)])
]
dp.send_msg(
parser.OFPFlowMod(dp,
match=match,
instructions=instructions,
priority=1))
def _switch_features_handler(self, ev):
datapath = ev.msg.datapath
# set group table
self.send_group_mod(datapath)
match = parser.OFPMatch(in_port = 1)
actions = [parser.OFPActionGroup(group_id = 1)]
self.program_flow(datapath, match, actions, priority = 10, hard_timeout = 0, idle_timeout = 0)
def _switch_features_handler(self, ev):
datapath = ev.msg.datapath
self.datapaths[datapath.id] = datapath
self.statistics.append({})
# All packets with a destination address in the IP address range 22.0.0.0/8 are expected to arrive at host H2
match = parser.OFPMatch(eth_type=ether_types.ETH_TYPE_IP,
ipv4_src=('11.0.0.0', '255.0.0.0'),
ipv4_dst=('22.0.0.0', '255.0.0.0'))
actions = [parser.OFPActionOutput(2)]
self.program_flow(datapath,
match,
actions,
priority=20,
hard_timeout=0,
idle_timeout=0)
# All packets with a destination address in the IP address range 33.0.0.0/8 are expected to arrive at host H3
match = parser.OFPMatch(eth_type=ether_types.ETH_TYPE_IP,
ipv4_src=('11.0.0.0', '255.0.0.0'),
ipv4_dst=('33.0.0.0', '255.0.0.0'))
actions = [parser.OFPActionOutput(3)]
self.program_flow(datapath,
match,
actions,
priority=20,
hard_timeout=0,
idle_timeout=0)
# traffic destined to 44.0.0.0/8 should be forwarded in such a way that the overall traffic is evenly distributed among the two hosts H2 and H3
# set group table
self.send_group_mod(datapath)
match = parser.OFPMatch(eth_type=ether_types.ETH_TYPE_IP,
ipv4_src=('11.0.0.0', '255.0.0.0'),
ipv4_dst=('44.0.0.0', '255.0.0.0'))
actions = [parser.OFPActionGroup(group_id=1)]
self.program_flow(datapath,
match,
actions,
priority=10,
hard_timeout=0,
idle_timeout=0)
def group_act(group_id):
"""Return an action to run a group."""
return parser.OFPActionGroup(group_id)
def install_probing(self, datapath):
'''Redirect node rules'''
if datapath.id == 2:
'''Packet duplication group entry'''
buckets = []
actions = [
ofparser.OFPActionSetField(mpls_label=17),
ofparser.OFPActionOutput(port=3)
]
buckets.append(ofparser.OFPBucket(actions=actions))
actions = [
ofparser.OFPActionSetField(mpls_label=100),
ofparser.OFPActionOutput(port=1)
]
buckets.append(ofparser.OFPBucket(actions=actions))
req = ofparser.OFPGroupMod(datapath=datapath,
type_=ofproto.OFPGT_ALL,
group_id=0,
buckets=buckets)
datapath.send_msg(req)
'''Probing rule: packet duplicated in both primary and detour path'''
match = ofparser.OFPMatch(in_port=2,
state=100,
eth_dst="00:00:00:00:00:06",
eth_src="00:00:00:00:00:01",
eth_type=0x8847)
actions = [
osparser.OFPExpActionSetState(state=17,
table_id=0,
hard_timeout=10,
hard_rollback=100),
ofparser.OFPActionGroup(0)
]
self.add_flow(datapath=datapath,
table_id=0,
priority=10,
match=match,
actions=actions)
'''Match on probe packet: switch back to the primary path'''
match = ofparser.OFPMatch(in_port=1,
mpls_label=100,
eth_dst="00:00:00:00:00:06",
eth_src="00:00:00:00:00:01",
eth_type=0x8847)
actions = [osparser.OFPExpActionSetState(state=0, table_id=0)]
self.add_flow(datapath=datapath,
table_id=0,
priority=10,
match=match,
actions=actions)
'''Failure: switch on the detour path and set probing timeout'''
match = ofparser.OFPMatch(in_port=1,
mpls_label=17,
eth_dst="00:00:00:00:00:06",
eth_src="00:00:00:00:00:01",
eth_type=0x8847)
actions = [
osparser.OFPExpActionSetState(state=17,
table_id=0,
hard_timeout=10,
hard_rollback=100),
ofparser.OFPActionOutput(port=3)
]
self.add_flow(datapath=datapath,
table_id=0,
priority=10,
match=match,
actions=actions,
command=ofproto.OFPFC_MODIFY)
'''Detect node rules'''
if datapath.id == 3:
'''Probe handler group entry'''
buckets = []
actions = [ofparser.OFPActionOutput(port=2)]
buckets.append(ofparser.OFPBucket(watch_port=2, actions=actions))
actions = []
buckets.append(ofparser.OFPBucket(watch_port=1, actions=actions))
req = ofparser.OFPGroupMod(datapath=datapath,
type_=ofproto.OFPGT_FF,
group_id=0,
buckets=buckets)
datapath.send_msg(req)
'''Probe handler: if the link is up, the probe packet will be forwarded toward the next node, otherwise drop'''
match = ofparser.OFPMatch(in_port=1,
state=0,
mpls_label=100,
eth_dst="00:00:00:00:00:06",
eth_src="00:00:00:00:00:01",
eth_type=0x8847)
actions = [ofparser.OFPActionGroup(group_id=0)]
self.add_flow(datapath=datapath,
table_id=0,
priority=100,
match=match,
actions=actions)
'''It sends back a probe packet coming from the no more "unreachable node"'''
match = ofparser.OFPMatch(in_port=2,
state=0,
mpls_label=100,
eth_dst="00:00:00:00:00:06",
eth_src="00:00:00:00:00:01",
eth_type=0x8847)
actions = [ofparser.OFPActionOutput(1)]
self.add_flow(datapath=datapath,
table_id=0,
priority=10,
match=match,
actions=actions)
'''Unreachable node'''
if datapath.id == 4:
'''probe handler: it sends back a probe message coming from the previous node'''
match = ofparser.OFPMatch(in_port=1,
state=0,
mpls_label=100,
eth_dst="00:00:00:00:00:06",
eth_src="00:00:00:00:00:01",
eth_type=0x8847)
actions = [ofparser.OFPActionOutput(ofproto.OFPP_IN_PORT)]
self.add_flow(datapath=datapath,
table_id=0,
priority=100,
match=match,
actions=actions)
def group_act(group_id):
return parser.OFPActionGroup(group_id)
def install_spines(self, datapath):
######################### TABLE 1 CONFIG ###############
req = bebaparser.OFPExpMsgConfigureStatefulTable(datapath=datapath,
table_id=0,
stateful=1)
datapath.send_msg(req)
""" Set lookup extractor = {eth_dst} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_L_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=0)
datapath.send_msg(req)
""" Set update extractor = {eth_dst} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_U_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=0)
datapath.send_msg(req)
# mpls extractor
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=0,
field=ofproto.OXM_OF_MPLS_LABEL)
datapath.send_msg(req)
# timestamp extractor
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=1,
field=bebaproto.OXM_EXP_TIMESTAMP)
datapath.send_msg(req)
# packet length extractor
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=2,
field=bebaproto.OXM_EXP_PKT_LEN)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_GTE,
condition_id=0,
table_id=0,
operand_1_hf_id=1,
operand_2_fd_id=4)
datapath.send_msg(req)
########################### TABLE 1: MEASURING #####################
for i in LEAVES:
if i == 1:
out_ports = [2, 3]
elif i == 2:
out_ports = [1, 3]
elif i == 3:
out_ports = [1, 2]
buckets = []
actions = [
bebaparser.OFPExpActionWriteContextToField(
src_type=bebaproto.SOURCE_TYPE_GLOBAL_DATA_VAR,
src_id=4,
dst_field=ofproto.OXM_OF_MPLS_LABEL),
ofparser.OFPActionOutput(out_ports[0])
]
buckets.append(ofparser.OFPBucket(actions=actions))
actions = [
bebaparser.OFPExpActionWriteContextToField(
src_type=bebaproto.SOURCE_TYPE_GLOBAL_DATA_VAR,
src_id=5,
dst_field=ofproto.OXM_OF_MPLS_LABEL),
ofparser.OFPActionOutput(out_ports[1])
]
buckets.append(ofparser.OFPBucket(actions=actions))
# send the group action
req = ofparser.OFPGroupMod(datapath=datapath,
type_=ofproto.OFPGT_ALL,
group_id=i,
buckets=buckets)
datapath.send_msg(req)
match = ofparser.OFPMatch(in_port=i, eth_type=0x8847)
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=4,
operand_1_hf_id=0,
operand_2_gd_id=out_ports[0]),
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=5,
operand_1_hf_id=0,
operand_2_gd_id=out_ports[1]),
ofparser.OFPActionGroup(i)
]
self.add_flow(datapath=datapath,
priority=600,
table_id=0,
match=match,
actions=actions)
# first packet of a flow
match = ofparser.OFPMatch(state=0, in_port=i)
actions = [
bebaparser.OFPExpActionSetState(table_id=0,
state=1,
idle_timeout=2),
# saves timestamp
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_hf_id=1,
operand_2_cost=PROBE_FREQ)
]
insts = [
ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions),
ofparser.OFPInstructionGotoTable(1)
]
mod = ofparser.OFPFlowMod(datapath=datapath,
table_id=0,
priority=500,
match=match,
instructions=insts)
datapath.send_msg(mod)
# simple forwarding packets go to second table to forward
match = ofparser.OFPMatch(state=1, in_port=i, condition0=1)
actions = [ # calculates deltaT: FDV[1]=HF[1]-FDV[0]=TS_NOW - TS_LAST
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=1,
operand_1_hf_id=1,
operand_2_fd_id=0),
# calculates rate: R = (bytes / deltaT_ms) * 8 [kb/s]
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_MUL,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_cost=8),
# stores the result in FDV[3]: THE FLOW ESTIMATED RATE
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_DIV,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_fd_id=1),
# calculates ewma
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_EWMA,
output_fd_id=3,
operand_1_fd_id=3,
operand_2_cost=ALPHA,
operand_3_fd_id=2),
# saves current timestamp
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=0,
operand_1_hf_id=1,
operand_2_cost=0),
# saves timestamp + probe freq
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_hf_id=1,
operand_2_cost=PROBE_FREQ),
# reset byte counter
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_fd_id=2),
# saves in GDV[i] the ewma
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=i,
operand_1_fd_id=3,
operand_2_cost=0)
]
instructions = [
ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions),
ofparser.OFPInstructionGotoTable(1)
]
mod = ofparser.OFPFlowMod(datapath=datapath,
priority=0,
table_id=0,
match=match,
instructions=instructions)
datapath.send_msg(mod)
match = ofparser.OFPMatch(state=1, in_port=i, condition0=0)
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_hf_id=2)
]
instructions = [
ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions),
ofparser.OFPInstructionGotoTable(1)
]
mod = ofparser.OFPFlowMod(datapath=datapath,
priority=0,
table_id=0,
match=match,
instructions=instructions)
datapath.send_msg(mod)
######################## TABLE 2: FORWARDING ################
for i in LEAVES:
match = ofparser.OFPMatch(eth_dst=MAC_ADDRS[i - 1])
actions = [ofparser.OFPActionOutput(i)]
self.add_flow(datapath=datapath,
table_id=1,
priority=0,
match=match,
actions=actions)
def install_leaves(self, datapath):
##################################### TABLE 0: DISPATCHING ##################################################
######################### TABLE 0 CONFIG ###############
req = bebaparser.OFPExpMsgConfigureStatefulTable(datapath=datapath,
table_id=0,
stateful=1)
datapath.send_msg(req)
""" Set lookup extractor = {eth_dst} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_L_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=0)
datapath.send_msg(req)
""" Set update extractor = {eth_dst} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_U_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=0)
datapath.send_msg(req)
""" Field extractor for mpls label """
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=0,
field=ofproto.OXM_OF_MPLS_LABEL)
datapath.send_msg(req)
""" Field extractor for timestamp """
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=1,
field=bebaproto.OXM_EXP_TIMESTAMP)
datapath.send_msg(req)
""" Packet counter_max for designing probe frequency """
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath, table_id=0, global_data_variable_id=0, value=9)
datapath.send_msg(req)
""" Condition C0: if counter reaches counter_max, then trigger probe sending """
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
table_id=0,
condition_id=0,
condition=bebaproto.CONDITION_GTE,
operand_1_fd_id=0,
operand_2_gd_id=0)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
table_id=0,
condition_id=3,
condition=bebaproto.CONDITION_GTE,
operand_1_fd_id=0,
operand_2_gd_id=0)
datapath.send_msg(req)
##################################### TABLE 0 FLOWS ##################################################
""" RECEIVE PROBE ACTION """
""" When a probe is received tab0 sends it to tab3"""
""" match: MPLS """
""" no action """
""" instruction: goto tab3"""
match = ofparser.OFPMatch(eth_type=0x8847)
instructions = [ofparser.OFPInstructionGotoTable(3)]
mod = ofparser.OFPFlowMod(datapath=datapath,
table_id=0,
priority=200,
match=match,
instructions=instructions)
datapath.send_msg(mod)
for i in UPPER_PORTS:
""" Writes metadata 1 if C0 is true (i.e. if it's time to send probe) to inform the Util Table (2) """
match = ofparser.OFPMatch(in_port=i, condition0=1)
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=0,
operand_1_fd_id=0,
operand_2_gd_id=0),
ofparser.OFPActionPushMpls()
] #push mpls for tab 2
instructions = [
ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions),
ofparser.OFPInstructionWriteMetadata(metadata=1,
metadata_mask=0xffffffff),
ofparser.OFPInstructionGotoTable(2)
]
mod = ofparser.OFPFlowMod(datapath=datapath,
table_id=0,
priority=50,
match=match,
instructions=instructions)
datapath.send_msg(mod)
""" If C0 is false, update the counter (i++) and go to Util Table for ewma measuring """
match = ofparser.OFPMatch(in_port=i, condition0=0)
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=0,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=0,
operand_1_fd_id=0,
operand_2_cost=1)
]
instructions = [
ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions),
ofparser.OFPInstructionGotoTable(2)
]
mod = ofparser.OFPFlowMod(datapath=datapath,
table_id=0,
priority=30,
match=match,
instructions=instructions)
datapath.send_msg(mod)
""" For packets from down ports (attached to hosts): go to ToR Discovery table (1) """
for i in DOWN_PORTS:
match = ofparser.OFPMatch(in_port=i)
instructions = [ofparser.OFPInstructionGotoTable(1)]
mod = ofparser.OFPFlowMod(datapath=datapath,
table_id=0,
priority=0,
match=match,
instructions=instructions)
datapath.send_msg(mod)
for i in [0, 1]:
match = ofparser.OFPMatch(in_port=3,
eth_type=0x0800,
ip_proto=6,
tcp_dst=10000 + i)
actions = [ofparser.OFPActionOutput(i + 1)]
self.add_flow(datapath=datapath,
table_id=0,
priority=200,
match=match,
actions=actions)
match = ofparser.OFPMatch(in_port=3,
eth_type=0x0800,
ip_proto=6,
tcp_src=10000 + i)
actions = [ofparser.OFPActionOutput(i + 1)]
self.add_flow(datapath=datapath,
table_id=0,
priority=200,
match=match,
actions=actions)
######################## TABLE 1 ToR DISCOVERY #########################################################
# this cycle writes metadata specifying to which leaf belongs the packet
for i in LEAVES:
if (i != datapath.id):
match = ofparser.OFPMatch(eth_dst=MAC_ADDRS[i - 1])
instructions = [
ofparser.OFPInstructionWriteMetadata(
metadata=i, metadata_mask=0xffffffff),
ofparser.OFPInstructionGotoTable(3)
]
mod = ofparser.OFPFlowMod(datapath=datapath,
table_id=1,
priority=0,
match=match,
instructions=instructions)
datapath.send_msg(mod)
######################### TABLE 2: ACTIVE PROBING ######################################################
################### TABLE 2 CONFIG #########
req = bebaparser.OFPExpMsgConfigureStatefulTable(datapath=datapath,
table_id=2,
stateful=1)
datapath.send_msg(req)
""" Set lookup extractor = {IN_PORT} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_L_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=2)
datapath.send_msg(req)
""" Set update extractor = {IN_PORT} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_U_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=2)
datapath.send_msg(req)
# multiply factor: convert to kbit/s
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=2,
global_data_variable_id=0,
value=8000)
datapath.send_msg(req)
# number of averaging samples
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath, table_id=2, global_data_variable_id=3, value=40)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=2,
extractor_id=1,
field=bebaproto.OXM_EXP_TIMESTAMP)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=2,
extractor_id=2,
field=bebaproto.OXM_EXP_PKT_LEN)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_GTE,
condition_id=0,
table_id=2,
operand_1_fd_id=4,
operand_2_gd_id=3)
datapath.send_msg(req)
############################### TABLE 2 FLOWS #############################
""" For every packet coming from spine ports, calculates ewma """
for i in UPPER_PORTS:
#simply ewma measuring
match = ofparser.OFPMatch(in_port=i, condition0=1)
actions_ewma_1 = [ #calculates deltaT: FDV[1]=HF[1]-FDV[0]=TS_NOW - TS_LAST
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=1,
operand_1_hf_id=1,
operand_2_fd_id=0),
#calculates rate: R = (bytes / deltaT_us) * 1000 kB/s
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_MUL,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_gd_id=0),
#stores the result in FDV[3]: THE FLOW ESTIMATED RATE
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_DIV,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_fd_id=1),
#calculates ewma
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_EWMA,
output_fd_id=3,
operand_1_fd_id=3,
operand_2_cost=bebaproto.EWMA_PARAM_0250,
operand_3_fd_id=2),
#saves current timestamp
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=0,
operand_1_hf_id=1,
operand_2_cost=0),
#counter returns to zero
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=4,
operand_1_fd_id=4,
operand_2_fd_id=4),
# saves in GDV[i] the ewma
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=i,
operand_1_fd_id=3,
operand_2_cost=0)
]
self.add_flow(datapath=datapath,
table_id=2,
priority=30,
match=match,
actions=actions_ewma_1 +
[ofparser.OFPActionOutput(3)])
match = ofparser.OFPMatch(in_port=i, condition0=0)
actions_ewma_2 = [
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_hf_id=2),
bebaparser.OFPExpActionSetDataVariable(
table_id=2,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_fd_id=4,
operand_2_cost=1)
]
self.add_flow(datapath=datapath,
table_id=2,
priority=30,
match=match,
actions=actions_ewma_2 +
[ofparser.OFPActionOutput(3)])
""" PROBES: When it matches metadata=1 it means that this packet has to be duplicated to piggyback on it the probe """
#group mod for packet duplication and probing
buckets = []
actions1 = [
ofparser.OFPActionSetField(mpls_tc=datapath.id), #the GDV[i]
bebaparser.OFPExpActionWriteContextToField(
src_type=bebaproto.SOURCE_TYPE_GLOBAL_DATA_VAR,
src_id=i,
dst_field=ofproto.OXM_OF_MPLS_LABEL),
ofparser.OFPActionOutput(ofproto.OFPP_IN_PORT)
]
buckets.append(ofparser.OFPBucket(actions=actions1))
actions1 = [
ofparser.OFPActionSetField(
mpls_tc=datapath.id), #the GDV[other]
bebaparser.OFPExpActionWriteContextToField(
src_type=bebaproto.SOURCE_TYPE_GLOBAL_DATA_VAR,
src_id=(1 if i == 2 else 2),
dst_field=ofproto.OXM_OF_MPLS_LABEL),
ofparser.OFPActionOutput((1 if i == 2 else 2))
]
buckets.append(ofparser.OFPBucket(actions=actions1))
req = ofparser.OFPGroupMod(datapath=datapath,
type_=ofproto.OFPGT_ALL,
group_id=i,
buckets=buckets)
datapath.send_msg(req)
# actual match and actions: group action, popMpls() and output(3)
match = ofparser.OFPMatch(in_port=i, eth_type=0x8847, metadata=1)
actions = [
ofparser.OFPActionGroup(i),
ofparser.OFPActionPopMpls(),
ofparser.OFPActionOutput(3)
]
self.add_flow(datapath=datapath,
table_id=2,
priority=100,
match=match,
actions=actions)
for j in [0, 1]:
match = ofparser.OFPMatch(in_port=i,
eth_type=0x0800,
ip_proto=6,
tcp_dst=10000 + j,
condition0=1)
actions = actions_ewma_1 + [ofparser.OFPActionOutput(3)]
self.add_flow(datapath=datapath,
table_id=2,
priority=150,
match=match,
actions=actions)
match = ofparser.OFPMatch(in_port=i,
eth_type=0x0800,
ip_proto=6,
tcp_src=10000 + j,
condition0=1)
actions = actions_ewma_1 + [ofparser.OFPActionOutput(3)]
self.add_flow(datapath=datapath,
table_id=2,
priority=150,
match=match,
actions=actions)
match = ofparser.OFPMatch(in_port=i,
eth_type=0x0800,
ip_proto=6,
tcp_dst=10000 + j,
condition0=0)
actions = actions_ewma_2 + [ofparser.OFPActionOutput(3)]
self.add_flow(datapath=datapath,
table_id=2,
priority=150,
match=match,
actions=actions)
match = ofparser.OFPMatch(in_port=i,
eth_type=0x0800,
ip_proto=6,
tcp_src=10000 + j,
condition0=0)
actions = actions_ewma_2 + [ofparser.OFPActionOutput(3)]
self.add_flow(datapath=datapath,
table_id=2,
priority=150,
match=match,
actions=actions)
######################## TABLE 3: FORWARDING ##############################################################
######################## TABLE 3 CONFIG #####################################################################
##### GDV[1] contains path utilization to dest 1 on port 1
##### GDV[2] contains path utilization to dest 2 on port 1
##### GDV[3] contains path utilization to dest 1 on port 2
##### GDV[4] contains path utilization to dest 2 on port 2
req = bebaparser.OFPExpMsgConfigureStatefulTable(datapath=datapath,
table_id=3,
stateful=1)
datapath.send_msg(req)
""" Set lookup extractor = {ETH_DST IP_PROTO TCP_DST} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_L_EXTRACTOR,
fields=[
ofproto.OXM_OF_IPV4_SRC, ofproto.OXM_OF_IPV4_DST,
ofproto.OXM_OF_TCP_SRC, ofproto.OXM_OF_TCP_DST
],
table_id=3)
datapath.send_msg(req)
""" Set update extractor = {} """
req = bebaparser.OFPExpMsgKeyExtract(
datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_U_EXTRACTOR,
fields=[
ofproto.OXM_OF_IPV4_SRC, ofproto.OXM_OF_IPV4_DST,
ofproto.OXM_OF_TCP_SRC, ofproto.OXM_OF_TCP_DST
],
table_id=3)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=3,
extractor_id=0,
field=ofproto.OXM_OF_MPLS_LABEL)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=3,
extractor_id=1,
field=bebaproto.OXM_EXP_TIMESTAMP)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=3,
extractor_id=2,
field=bebaproto.OXM_EXP_PKT_LEN)
datapath.send_msg(req)
# GDV[0] = multiply factor
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=3,
global_data_variable_id=0,
value=8000)
datapath.send_msg(req)
# GDV[6] = packets needed for average
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=3,
global_data_variable_id=6,
value=40 - 1)
datapath.send_msg(req)
# GDV[5] = elephant flow threshold
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=3,
global_data_variable_id=5,
value=2000) # 2000 kb/s
datapath.send_msg(req)
# Lower flow threshold
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=3,
global_data_variable_id=7,
value=300)
datapath.send_msg(req)
for i in [1, 2, 3]:
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=3,
global_data_variable_id=i,
value=0)
datapath.send_msg(req)
#################################### TABLE 3 FLOWS ###################################
# many conditions as the number of LEAVES-1
# for i in LEAVES except datapath.id: create condition[i]
# in the case of 2 Spines. For more spines the configuration becomes more complex
for destLeaf in [1, 2]:
# C[destinationLeaf]: which port is less utilized?
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_LTE,
condition_id=destLeaf,
table_id=3,
operand_1_gd_id=destLeaf,
operand_2_gd_id=destLeaf + 2)
datapath.send_msg(req)
# C[0], has the flow exceeded threshold? i.e. flow_rate >= threshold => FDV[3] >= GDV[5]
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_GTE,
condition_id=0,
table_id=3,
operand_1_fd_id=3,
operand_2_gd_id=5)
datapath.send_msg(req)
# C[3], is the other flow lower than a value? FDV[4] < GDV[7] ?
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_LTE,
condition_id=3,
table_id=3,
operand_1_fd_id=4,
operand_2_gd_id=7)
datapath.send_msg(req)
# C[4]: did the counter reach counterMax? FDV[5] = GDV[6] ?
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_EQ,
condition_id=4,
table_id=3,
operand_1_fd_id=5,
operand_2_gd_id=6)
datapath.send_msg(req)
# leaf number dependent flows
if datapath.id == 1:
#LEAF 1 new flows: fetch the destination leaf and check the appropriate condition
match1true = ofparser.OFPMatch(metadata=2, condition1=1,
state=0) #dst=2, port 1
match2true = ofparser.OFPMatch(metadata=3, condition2=1,
state=0) #dst=3, port 1
match1false = ofparser.OFPMatch(metadata=2, condition1=0,
state=0) #dst=2, port 2
match2false = ofparser.OFPMatch(metadata=3, condition2=0,
state=0) #dst=3, port 2
elif datapath.id == 2:
#LEAF 2 new flows: fetch the destination leaf and check the appropriate condition
match1true = ofparser.OFPMatch(metadata=1, condition1=1,
state=0) #dst=1, port 1
match2true = ofparser.OFPMatch(metadata=3, condition2=1,
state=0) #dst=3, port 1
match1false = ofparser.OFPMatch(metadata=1, condition1=0,
state=0) #dst=1, port 2
match2false = ofparser.OFPMatch(metadata=3, condition2=0,
state=0) #dst=3, port 2
elif datapath.id == 3:
#LEAF 3 new flows: fetch the destination leaf and check the appropriate condition
match1true = ofparser.OFPMatch(metadata=1, condition1=1,
state=0) #dst=1, port 1
match2true = ofparser.OFPMatch(metadata=2, condition2=1,
state=0) #dst=2, port 1
match1false = ofparser.OFPMatch(metadata=1, condition1=0,
state=0) #dst=1, port 2
match2false = ofparser.OFPMatch(metadata=2, condition2=0,
state=0) #dst=2, port 2
#if port 1 is better, set_state(1) and output 1
actions_true = [
bebaparser.OFPExpActionSetState(state=1,
table_id=3,
idle_timeout=5),
ofparser.OFPActionOutput(1)
]
#if port 2 is better, set_state(2) and output 2
actions_false = [
bebaparser.OFPExpActionSetState(state=2,
table_id=3,
idle_timeout=5),
ofparser.OFPActionOutput(2)
]
self.add_flow(datapath=datapath,
table_id=3,
priority=20,
match=match1true,
actions=actions_true)
self.add_flow(datapath=datapath,
table_id=3,
priority=20,
match=match2true,
actions=actions_true)
self.add_flow(datapath=datapath,
table_id=3,
priority=20,
match=match1false,
actions=actions_false)
self.add_flow(datapath=datapath,
table_id=3,
priority=20,
match=match2false,
actions=actions_false)
""" extract external probes' data and store in GDVs """
match = ofparser.OFPMatch(eth_type=0x8847, mpls_tc=datapath.id)
self.add_flow(datapath=datapath,
table_id=3,
priority=300,
match=match,
actions=[])
for i in UPPER_PORTS:
for leafNo in LEAVES:
match = ofparser.OFPMatch(in_port=i,
eth_type=0x8847,
mpls_tc=leafNo)
""" actions: save in GDVs external probes' data """
if datapath.id == 1:
if leafNo == 2:
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=(1 if i == 1 else 3),
operand_1_hf_id=0,
operand_2_cost=0)
]
elif leafNo == 3:
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=(2 if i == 1 else 4),
operand_1_hf_id=0,
operand_2_cost=0)
]
elif datapath.id == 2:
if leafNo == 1:
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=(1 if i == 1 else 3),
operand_1_hf_id=0,
operand_2_cost=0)
]
elif leafNo == 3:
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=(2 if i == 1 else 4),
operand_1_hf_id=0,
operand_2_cost=0)
]
elif datapath.id == 3:
if leafNo == 1:
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=(1 if i == 1 else 3),
operand_1_hf_id=0,
operand_2_cost=0)
]
elif leafNo == 2:
actions = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_gd_id=(2 if i == 1 else 4),
operand_1_hf_id=0,
operand_2_cost=0)
]
self.add_flow(datapath=datapath,
table_id=3,
priority=200,
match=match,
actions=actions)
for s in UPPER_PORTS:
for metadata in LEAVES:
# normal conditions, installed flows continue flowing, calculates ewma if counter reaches max
match = ofparser.OFPMatch(in_port=3,
state=s,
metadata=metadata,
condition4=1)
actions_ewma = [ #calculates deltaT: FDV[1]=HF[1]-FDV[0]=TS_NOW - TS_LAST
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=1,
operand_1_hf_id=1,
operand_2_fd_id=0),
#calculates rate: R = (bytes / deltaT_us) * 1000 kB/s
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_MUL,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_gd_id=0),
#stores the result in FDV[3]: THE FLOW ESTIMATED RATE
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_DIV,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_fd_id=1),
#calculates ewma
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_EWMA,
output_fd_id=3,
operand_1_fd_id=3,
operand_2_cost=bebaproto.EWMA_PARAM_0250,
operand_3_fd_id=2),
#saves current timestamp
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=0,
operand_1_hf_id=1,
operand_2_cost=0),
#counter returns to zero
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUB,
output_fd_id=5,
operand_1_fd_id=5,
operand_2_fd_id=5)
]
# FDV[4] = flow's alternative path utilization
if datapath.id == 1:
if metadata == 2:
actions_ewma += [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_gd_id=(1 if s == 2 else 3),
operand_2_cost=0)
]
elif metadata == 3:
actions_ewma += [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_gd_id=(2 if s == 2 else 4),
operand_2_cost=0)
]
elif datapath.id == 2:
if metadata == 1:
actions_ewma += [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_gd_id=(1 if s == 2 else 3),
operand_2_cost=0)
]
elif metadata == 3:
actions_ewma += [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_gd_id=(2 if s == 2 else 4),
operand_2_cost=0)
]
elif datapath.id == 3:
if metadata == 1:
actions_ewma += [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_gd_id=(1 if s == 2 else 3),
operand_2_cost=0)
]
elif metadata == 2:
actions_ewma += [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=4,
operand_1_gd_id=(2 if s == 2 else 4),
operand_2_cost=0)
]
actions = actions_ewma + [ofparser.OFPActionOutput(s)]
self.add_flow(datapath=datapath,
table_id=3,
priority=30,
match=match,
actions=actions)
# normal conditions
match = ofparser.OFPMatch(in_port=3,
state=s,
metadata=metadata,
condition4=0)
actions_ewma_bg = [
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=2,
operand_1_fd_id=2,
operand_2_hf_id=2),
bebaparser.OFPExpActionSetDataVariable(
table_id=3,
opcode=bebaproto.OPCODE_SUM,
output_fd_id=5,
operand_1_fd_id=5,
operand_2_cost=1)
]
actions = actions_ewma_bg + [ofparser.OFPActionOutput(s)]
self.add_flow(datapath=datapath,
table_id=3,
priority=30,
match=match,
actions=actions)
########### match for extended states: same thing as in normal states but evaluate condition0 ##########
match = ofparser.OFPMatch(in_port=3,
state=s + (1 << 5),
metadata=metadata,
condition0=1,
condition4=1)
actions = actions_ewma + [ofparser.OFPActionOutput(s)]
self.add_flow(datapath=datapath,
table_id=3,
priority=35,
match=match,
actions=actions)
match = ofparser.OFPMatch(in_port=3,
state=s + (1 << 5),
metadata=metadata,
condition0=1,
condition4=0)
actions = actions_ewma_bg + [ofparser.OFPActionOutput(s)]
self.add_flow(datapath=datapath,
table_id=3,
priority=35,
match=match,
actions=actions)
############# condition[0] and [3] are verified, (i.e. big flow) change port ###########
match = ofparser.OFPMatch(in_port=3,
state=s,
condition0=1,
condition3=1)
actions = [
bebaparser.OFPExpActionSetState(
state=(1 if s == 2 else 2) + (1 << 5),
table_id=3,
idle_timeout=5),
ofparser.OFPActionOutput(1 if s == 2 else 2)
]
self.add_flow(datapath=datapath,
table_id=3,
priority=40,
match=match,
actions=actions)
########### if the flow returns to a rate under the threshold #############################
match = ofparser.OFPMatch(in_port=3,
state=s + (1 << 5),
condition0=0)
actions = [
bebaparser.OFPExpActionSetState(state=s,
table_id=3,
idle_timeout=5),
ofparser.OFPActionOutput(s)
]
self.add_flow(datapath=datapath,
table_id=3,
priority=50,
match=match,
actions=actions)
def install_spines(self, datapath):
######################### TABLE 1 CONFIG ###############
req = bebaparser.OFPExpMsgConfigureStatefulTable(
datapath=datapath,
table_id=0,
stateful=1)
datapath.send_msg(req)
""" Set lookup extractor = {eth_dst} """
req = bebaparser.OFPExpMsgKeyExtract(datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_L_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=0)
datapath.send_msg(req)
""" Set update extractor = {eth_dst} """
req = bebaparser.OFPExpMsgKeyExtract(datapath=datapath,
command=bebaproto.OFPSC_EXP_SET_U_EXTRACTOR,
fields=[ofproto.OXM_OF_IN_PORT],
table_id=0)
datapath.send_msg(req)
# multiply factor
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=0,
global_data_variable_id=0,
value=8000)
datapath.send_msg(req)
# averaging points
req = bebaparser.OFPExpMsgsSetGlobalDataVariable(
datapath=datapath,
table_id=0,
global_data_variable_id=1,
value=AVG_SAMPLES)
datapath.send_msg(req)
# mpls extractor
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=0,
field=ofproto.OXM_OF_MPLS_LABEL
)
datapath.send_msg(req)
# timestamp
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=1,
field=bebaproto.OXM_EXP_TIMESTAMP
)
datapath.send_msg(req)
# packet lenght
req = bebaparser.OFPExpMsgHeaderFieldExtract(
datapath=datapath,
table_id=0,
extractor_id=2,
field=bebaproto.OXM_EXP_PKT_LEN)
datapath.send_msg(req)
req = bebaparser.OFPExpMsgSetCondition(
datapath=datapath,
condition=bebaproto.CONDITION_GTE,
condition_id=0,
table_id=0,
operand_1_fd_id=4,
operand_2_gd_id=1)
datapath.send_msg(req)
########################### TABLE 1: MEASURING #####################
for i in LEAVES:
if i == 1:
out_ports = [6, 7]
elif i == 2:
out_ports = [5, 7]
elif i == 3:
out_ports = [5, 6]
buckets = []
actions = [
bebaparser.OFPExpActionWriteContextToField(src_type=bebaproto.SOURCE_TYPE_GLOBAL_DATA_VAR, src_id=3,
dst_field=ofproto.OXM_OF_MPLS_LABEL),
ofparser.OFPActionOutput(out_ports[0] - 4)]
buckets.append(ofparser.OFPBucket(actions=actions))
actions = [
bebaparser.OFPExpActionWriteContextToField(src_type=bebaproto.SOURCE_TYPE_GLOBAL_DATA_VAR, src_id=4,
dst_field=ofproto.OXM_OF_MPLS_LABEL),
ofparser.OFPActionOutput(out_ports[1] - 4)]
buckets.append(ofparser.OFPBucket(actions=actions))
# send the group action
req = ofparser.OFPGroupMod(datapath=datapath,
type_=ofproto.OFPGT_ALL,
group_id=i,
buckets=buckets)
datapath.send_msg(req)
match = ofparser.OFPMatch(in_port=i, eth_type=0x8847)
actions = [bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUM, output_gd_id=3,
operand_1_hf_id=0, operand_2_gd_id=out_ports[0]),
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUM, output_gd_id=4,
operand_1_hf_id=0, operand_2_gd_id=out_ports[1]),
ofparser.OFPActionGroup(i)]
self.add_flow(datapath=datapath, priority=100, table_id=0, match=match, actions=actions)
# simple forwarding packets go to second table to forward
match = ofparser.OFPMatch(in_port=i, condition0=1)
actions = [ # calculates deltaT: FDV[1]=HF[1]-FDV[0]=TS_NOW - TS_LAST
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUB, output_fd_id=1,
operand_1_hf_id=1, operand_2_fd_id=0),
# calculates rate: R = (bytes / deltaT_us) * 1000 kB/s
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_MUL, output_fd_id=2,
operand_1_fd_id=2, operand_2_gd_id=0),
# stores the result in FDV[3]: THE FLOW ESTIMATED RATE
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_DIV, output_fd_id=2,
operand_1_fd_id=2, operand_2_fd_id=1),
# calculates ewma
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_EWMA, output_fd_id=3,
operand_1_fd_id=3, operand_2_cost=bebaproto.EWMA_PARAM_0375,
operand_3_fd_id=2),
# saves current timestamp
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUM, output_fd_id=0,
operand_1_hf_id=1, operand_2_cost=0),
# counter returns to zero
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUB, output_fd_id=4,
operand_1_fd_id=4, operand_2_fd_id=4),
# saves in GDV[i+4] the ewma port[1,2,3]->[5,6,7]
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUM, output_gd_id=i + 4,
operand_1_fd_id=3, operand_2_cost=0)]
instructions = [ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions),
ofparser.OFPInstructionGotoTable(1)]
mod = ofparser.OFPFlowMod(datapath=datapath, priority=0, table_id=0, match=match, instructions=instructions)
datapath.send_msg(mod)
match = ofparser.OFPMatch(in_port=i, condition0=0)
actions = [bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUM, output_fd_id=2,
operand_1_fd_id=2, operand_2_hf_id=2),
bebaparser.OFPExpActionSetDataVariable(table_id=0, opcode=bebaproto.OPCODE_SUM, output_fd_id=4,
operand_1_fd_id=4, operand_2_cost=1)]
instructions = [ofparser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, actions),
ofparser.OFPInstructionGotoTable(1)]
mod = ofparser.OFPFlowMod(datapath=datapath, priority=0, table_id=0, match=match, instructions=instructions)
datapath.send_msg(mod)
######################## TABLE 2: FORWARDING ################
for i in LEAVES:
match = ofparser.OFPMatch(eth_dst=MAC_ADDRS[i - 1])
actions = [ofparser.OFPActionOutput(i)]
self.add_flow(datapath=datapath, table_id=1, priority=0, match=match, actions=actions)
def add_switch(self,ev):
""" Switch enter event
When a new switch is added to the network is it
the job of the init module to delete all previous
flows and install the table miss flows.
"""
new_datapath = ev.switch.dp
# Delete all previous flows in all tables, we can't
# just delete all flows since the topology discovery
# service also installs flows and runs before this
# module. Instead does this controller only add rules
# with cookie set to 1, which the following lines will
# delete.
for table in [0,1]:
delete_msg = parser.OFPFlowMod(
datapath=new_datapath,
table_id=table,
cookie=1,
cookie_mask=1,
command=ofproto.OFPFC_DELETE,
out_port=ofproto.OFPP_ANY,
out_group=ofproto.OFPG_ANY,
match=parser.OFPMatch(),
instructions=[]
)
new_datapath.send_msg(delete_msg)
# Add flowtable 0 table miss entry
add_msg_0 = parser.OFPFlowMod(
datapath=new_datapath,
table_id=0,
priority=0,
cookie=1,
command=ofproto.OFPFC_ADD,
match=parser.OFPMatch(),
instructions=[
parser.OFPInstructionGotoTable(1),
parser.OFPInstructionActions(
type_=ofproto.OFPIT_WRITE_ACTIONS,
actions=[parser.OFPActionGroup(group_id=0)]
)
]
)
new_datapath.send_msg(add_msg_0)
# Add flowtable 1 table miss entry
add_msg_1 = parser.OFPFlowMod(
datapath=new_datapath,
table_id=1,
priority=0,
cookie=1,
command=ofproto.OFPFC_ADD,
match=parser.OFPMatch(),
instructions=[
parser.OFPInstructionActions(
type_=ofproto.OFPIT_APPLY_ACTIONS,
actions=[parser.OFPActionOutput(ofproto.OFPP_CONTROLLER)]
)
]
)
new_datapath.send_msg(add_msg_1)
def switch_features_handler(self, ev):
msg = ev.msg
datapath = msg.datapath
LOG.info("Configuring switch %d..." % datapath.id)
""" Set table 0 as stateful """
req = osparser.OFPExpMsgConfigureStatefulTable(datapath=datapath,
table_id=0,
stateful=1)
datapath.send_msg(req)
""" Set lookup extractor = {ip_src, ip_dst, tcp_src, tcp_dst} """
req = osparser.OFPExpMsgKeyExtract(datapath=datapath,
command=osproto.OFPSC_EXP_SET_L_EXTRACTOR,
fields=[ofproto.OXM_OF_IPV4_SRC,ofproto.OXM_OF_IPV4_DST,ofproto.OXM_OF_TCP_SRC,ofproto.OXM_OF_TCP_DST],
table_id=0)
datapath.send_msg(req)
""" Set update extractor = {ip_src, ip_dst, tcp_src, tcp_dst} (same as lookup) """
req = osparser.OFPExpMsgKeyExtract(datapath=datapath,
command=osproto.OFPSC_EXP_SET_U_EXTRACTOR,
fields=[ofproto.OXM_OF_IPV4_SRC,ofproto.OXM_OF_IPV4_DST,ofproto.OXM_OF_TCP_SRC,ofproto.OXM_OF_TCP_DST],
table_id=0)
datapath.send_msg(req)
""" Group table setup """
buckets = []
# Action Bucket: <PWD port_i , SetState(i-1)
for port in range(2,SWITCH_PORTS+1):
max_len = 2000
dest_ip=self.int_to_ip_str(port)
dest_eth=self.int_to_mac_str(port)
dest_tcp=(port)*100
actions = [ osparser.OFPExpActionSetState(state=port, table_id=0),
ofparser.OFPActionSetField(ipv4_dst=dest_ip),
ofparser.OFPActionSetField(eth_dst=dest_eth),
ofparser.OFPActionSetField(tcp_dst=dest_tcp),
ofparser.OFPActionOutput(port=port, max_len=max_len) ]
buckets.append(ofparser.OFPBucket(weight=100,
watch_port=ofproto.OFPP_ANY,
watch_group=ofproto.OFPG_ANY,
actions=actions))
req = ofparser.OFPGroupMod(datapath=datapath,
command=ofproto.OFPGC_ADD,
type_=ofproto.OFPGT_SELECT,
group_id=1,
buckets=buckets)
datapath.send_msg(req)
""" ARP packets flooding """
match = ofparser.OFPMatch(eth_type=0x0806)
actions = [ofparser.OFPActionOutput(port=ofproto.OFPP_FLOOD)]
self.add_flow(datapath=datapath, table_id=0, priority=100,
match=match, actions=actions)
""" Reverse path flow """
for in_port in range(2, SWITCH_PORTS + 1):
src_ip=self.int_to_ip_str(in_port)
src_eth=self.int_to_mac_str(in_port)
src_tcp=in_port*100
# we need to match an IPv4 (0x800) TCP (6) packet to do SetField()
match = ofparser.OFPMatch(in_port=in_port, eth_type=0x800, ip_proto=6, ipv4_src=src_ip,eth_src=src_eth,tcp_src=src_tcp)
actions = [ofparser.OFPActionSetField(ipv4_src="10.0.0.2"),
ofparser.OFPActionSetField(eth_src="00:00:00:00:00:02"),
ofparser.OFPActionSetField(tcp_src=80),
ofparser.OFPActionOutput(port=1, max_len=0)]
self.add_flow(datapath=datapath, table_id=0, priority=100,
match=match, actions=actions)
""" Forwarding consistency rules"""
match = ofparser.OFPMatch(in_port=1, state=0, eth_type=0x800, ip_proto=6)
actions = [ofparser.OFPActionGroup(1)]
self.add_flow(datapath=datapath, table_id=0, priority=100,
match=match, actions=actions)
for state in range(2,SWITCH_PORTS+1):
dest_ip=self.int_to_ip_str(state)
dest_eth=self.int_to_mac_str(state)
dest_tcp=(state)*100
match = ofparser.OFPMatch(in_port=1, state=state, eth_type=0x800, ip_proto=6)
actions = [ ofparser.OFPActionSetField(ipv4_dst=dest_ip),
ofparser.OFPActionSetField(eth_dst=dest_eth),
ofparser.OFPActionSetField(tcp_dst=dest_tcp),
ofparser.OFPActionOutput(port=state, max_len=0)]
self.add_flow(datapath=datapath, table_id=0, priority=100,
match=match, actions=actions)