Based on what you insisted me, i used idletimeout to delete flows, but my
controller is not receiving my packetIn message automatically, when station
moves to different AP, I am including my controller code, Let me know if i
need add a loop to direct the packetIn message to controller or am i
missing with some logic in my code?
# Copyright (C) 2011 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 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 = {}
@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
#
# We specify NO BUFFER to max_len of the output action due to
# OVS bug. At this moment, if we specify a lesser number, e.g.,
# 128, OVS will send Packet-In with invalid buffer_id and
# truncated packet data. In that case, we cannot output packets
# correctly. The bug has been fixed in OVS v2.1.0.
match = parser.OFPMatch()
actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
ofproto.OFPCML_NO_BUFFER)]
self.add_flow(datapath, 0, match, actions)
def add_flow(self, datapath, priority, match, actions, 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, idle_timeout=50,
priority=priority, match=match,
instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath,
idle_timeout=50, priority=priority,
match=match, instructions=inst)
datapath.send_msg(mod)
def del_flow(self, datapath, match):
ofproto = datapath.ofproto
mod = datapath.ofproto_parser.OFPFlowMod(datapath=datapath,
match=match, cookie=0,
command=ofproto.OFPFC_DELETE, idle_timeout=0, hard_timeout=0,
priority=priority)
datapath.send_msg(mod)
"""
def add_flow1(self, datapath, priority, match, actions,
buffer_id=buffer_id):
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, idle_timeout=50,
priority=2000, match=match,
instructions=inst)
else:
mod = parser.OFPFlowMod(datapath=datapath,
idle_timeout=50, priority=2000,
match=match, instructions=inst)
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
ofproto = datapath.ofproto
parser = datapath.ofproto_parser
in_port = msg.match['in_port']
pkt = packet.Packet(msg.data)
eth = pkt.get_protocols(ethernet.ethernet)[0]
dst = eth.dst
src = eth.src
dpid = datapath.id
self.mac_to_port.setdefault(dpid, {})
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 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_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.del_flow(datapath, match)
self.add_flow(datapath, 1, match, actions, msg.buffer_id)
return
else:
self.del_flow(datapath, match)
self.add_flow(datapath, 2, match, actions, msg.buffer_id)
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)
On Mon, Apr 24, 2017 at 1:10 PM, Yi Tseng <[email protected]> wrote:
> Hi
>
>
>
> *Please don't drop mailing list*
> If flows had been removed, the controller should received PacketIn message
> again, the simple switch application should install new flow into the
> switch.
>
> --
> Yi
>
> 2017-04-24 11:03 GMT-07:00 varun hrithik <[email protected]>:
>
>> yeah, removing flows is fine, i want t know how those flows can be added
>> to the new ap, such that when a station is in between two APs( i.e, if the
>> station are connected to two APs at the same time) , new AP should be able
>> to connect wid station, so that new flows are created.
>>
>> On Mon, Apr 24, 2017 at 12:47 PM, Yi Tseng <[email protected]> wrote:
>>
>>> Hi,
>>>
>>> I think the easiest way is to set idle timeout for every flow, if any
>>> host move to another device(AP), the original flow will be removed.
>>>
>>> --
>>> Yi
>>>
>>> 2017-04-24 9:00 GMT-07:00 varun hrithik <[email protected]>:
>>>
>>>> I have created a topolgy which has 5 stations moving around 5 access
>>>> points using mininet-wifi (tool) extension of mininet which allows GUI
>>>> format of wireless network simualtion.
>>>> Now im trying to handle mobility of those moving stations using ryu
>>>> controller example code (simple_switch_13.py),
>>>>
>>>> NOW THE PROBLEM IS,
>>>>
>>>> When the stations are inbetween two accespoints which have access range
>>>> overlapped, the packets are not getting transferred from one ap to another
>>>> (mobility is not working), so i want to know how to add and delete flows
>>>> in the ryu controller code(simple_switch_13.py), so that my mobility works.
>>>>
>>>> SORRY FOR THE BIG QUESTION !
>>>>
>>>> Thank you
>>>> Varun Siripurapu
>>>>
>>>> ------------------------------------------------------------
>>>> ------------------
>>>> Check out the vibrant tech community on one of the world's most
>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>>> _______________________________________________
>>>> Ryu-devel mailing list
>>>> [email protected]
>>>> https://lists.sourceforge.net/lists/listinfo/ryu-devel
>>>>
>>>>
>>>
>>>
>>> --
>>> Yi Tseng (a.k.a Takeshi)
>>> Taiwan National Chiao Tung University
>>> Department of Computer Science
>>> W2CNLab
>>>
>>> https://takeshi.tw
>>>
>>
>>
>
>
> --
> Yi Tseng (a.k.a Takeshi)
> Taiwan National Chiao Tung University
> Department of Computer Science
> W2CNLab
>
> https://takeshi.tw
>
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