HI All,
I am doing a simple experiment to add a default table miss flow entry to a
hardware OpenFlow Switch. Below are the details of the tools I am using
Controller : RYU
OpenFlow Switch : FortiCore 3700E
OF_version : 1.3
I am using the example code (example_switch_13.py) available in ryu/app.
*ERROR :*
loading app ryu/ryu/app/example_switch_13.py
loading app ryu.controller.ofp_handler
instantiating app ryu/ryu/app/example_switch_13.py of ExampleSwitch13
instantiating app ryu.controller.ofp_handler of OFPHandler
BRICK ExampleSwitch13
CONSUMES EventOFPPacketIn
CONSUMES EventOFPSwitchFeatures
BRICK ofp_event
PROVIDES EventOFPPacketIn TO {'ExampleSwitch13': set(['main'])}
PROVIDES EventOFPSwitchFeatures TO {'ExampleSwitch13': set(['config'])}
CONSUMES EventOFPSwitchFeatures
CONSUMES EventOFPErrorMsg
CONSUMES EventOFPEchoRequest
CONSUMES EventOFPEchoReply
CONSUMES EventOFPHello
CONSUMES EventOFPPortStatus
CONSUMES EventOFPPortDescStatsReply
connected socket:<eventlet.greenio.base.GreenSocket object at
0x7fddad9259d0> address:('10.2.1.35', 25656)
hello ev <ryu.controller.ofp_event.EventOFPHello object at 0x7fddad932290>
move onto config mode
EVENT ofp_event->ExampleSwitch13 EventOFPSwitchFeatures
switch features ev version=0x4,msg_type=0x6,msg_len=0x20,xid=0xa5440ccd,
OFPSwitchFeatures(auxiliary_id=0,capabilities=5,datapath_
id=158796421868064,n_buffers=0,n_tables=1)
This is the port : 4294967293
Buffer Id is : 65535
Actions : [OFPActionOutput(len=16,max_len=65535,port=6633,type=0)]
Instructions : [OFPInstructionActions(actions=[OFPActionOutput(len=
16,max_len=65535,port=6633,type=0)],type=4)]
modification : version=None,msg_type=None,msg_len=None,xid=None,
OFPFlowMod(buffer_id=65535,command=0,cookie=0,cookie_
mask=0,flags=0,hard_timeout=0,idle_timeout=0,instructions=[
OFPInstructionActions(actions=[OFPActionOutput(len=16,max_
len=65535,port=6633,type=0)],type=4)],match=OFPMatch(oxm_
fields={}),out_group=0,out_port=0,priority=0,table_id=0)
move onto main mode
EventOFPErrorMsg received.
version=0x4, msg_type=0x1, msg_len=0x4c, xid=0xa5440ccf
`-- msg_type: OFPT_ERROR(1)
OFPErrorMsg(type=0x5, code=0x0, data=b'\x04\x0e\x00\x50\xa5\
x44\x0c\xcf\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\x00\x01\x00\x04\x00\x00\x00\x00\x00\x04\x00\x18\x00\x00\x00\x00')
|-- type: OFPET_FLOW_MOD_FAILED(5)
|-- code: OFPFMFC_UNKNOWN(0)
`-- data: version=0x4, msg_type=0xe, msg_len=0x50, xid=0xa5440ccf
`-- msg_type: OFPT_FLOW_MOD(14)
Modified Application Script is attached. I have printed out the values of
the variables however I am not able to figure out whats going wrong when I
am sending the* flow_mod. *
Can someone please suggest me how i can resolve this error ?
Thanks in advance.
# Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from ryu.base import app_manager
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.packet import packet
from ryu.lib.packet import ethernet
class ExampleSwitch13(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(ExampleSwitch13, self).__init__(*args, **kwargs)
# initialize mac address table.
self.mac_to_port = {}
@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
print
print
print "This is the port : ", str(ofproto.OFPP_CONTROLLER)
print "Buffer Id is : ", ofproto.OFPCML_NO_BUFFER
print
print
# install the table-miss flow entry.
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(6633,
ofproto.OFPCML_NO_BUFFER)]
print
print "Actions : ", actions
print
self.add_flow(datapath, 0, match, actions)
def add_flow(self, datapath, priority, match, actions):
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
# construct flow_mod message and send it.
inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
actions)]
print
print "Instructions : ", inst
print
mod = parser.OFPFlowMod(datapath=datapath, table_id=0,priority=priority,
buffer_id=ofproto.OFPCML_NO_BUFFER, match=match, instructions=inst)
print
print "modification : ", mod
print
datapath.send_msg(mod)
@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
# get Datapath ID to identify OpenFlow switches.
dpid = datapath.id
self.mac_to_port.setdefault(dpid, {})
# analyse the received packets using the packet library.
pkt = packet.Packet(msg.data)
eth_pkt = pkt.get_protocol(ethernet.ethernet)
dst = eth_pkt.dst
src = eth_pkt.src
# get the received port number from packet_in message.
in_port = msg.match['in_port']
self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
# learn a mac address to avoid FLOOD next time.
self.mac_to_port[dpid][src] = in_port
# if the destination mac address is already learned,
# decide which port to output the packet, otherwise FLOOD.
if dst in self.mac_to_port[dpid]:
out_port = self.mac_to_port[dpid][dst]
else:
out_port = ofproto.OFPP_FLOOD
# construct action list.
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_dst=dst)
self.add_flow(datapath, 1, match, actions)
# construct packet_out message and send it.
out = parser.OFPPacketOut(datapath=datapath,
buffer_id=ofproto.OFP_NO_BUFFER,
in_port=in_port, actions=actions,
data=msg.data)
datapath.send_msg(out)
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