On Tue, 12 Feb 2013 11:12:46 +0100
Jeremias Blendin <jerem...@blendin.org> wrote:
> while Ryu supports OpenFlow 1.0, 1.2 and 1.3, the simple_switch.py example
> works with OpenFlow 1.0 only (search for v1_0 in the source code for
> details).
> As LINC switch uses OpenFlow 1.3 by default, and does not support OpenFlow
> 1.0, you get that "closed because of bad_initial_message" output.
>
> A patch for OF 1.2 compatibility for simple_switch.py was posted on this
> list
> some time ago. Using that and setting the backend to linc_us3 in the
> LINC switches sys.config should make it work.
The attached code works with OVS OF1.2 and OF1.3. But maybe this
doesn't work with other switches about OF1.3 since OF1.3 sends no
packet_in by default.
# 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.
import logging
import struct
from ryu.base import app_manager
from ryu.controller import mac_to_port
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_2
from ryu.ofproto import ofproto_v1_3
from ryu.lib.mac import haddr_to_str
LOG = logging.getLogger('ryu.app.simple_switch')
class SimpleSwitch(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_2.OFP_VERSION, ofproto_v1_3.OFP_VERSION]
def __init__(self, *args, **kwargs):
super(SimpleSwitch, self).__init__(*args, **kwargs)
self.mac_to_port = {}
def add_flow(self, dp, in_port, dst, actions):
ofproto = dp.ofproto
match = dp.ofproto_parser.OFPMatch()
match.set_in_port(in_port)
match.set_dl_dst(dst)
inst = [dp.ofproto_parser.OFPInstructionActions(
ofproto.OFPIT_APPLY_ACTIONS, actions)]
mod = dp.ofproto_parser.OFPFlowMod(dp, 0, 0, 0,
ofproto.OFPFC_ADD,
0, 0, 0, 0xffffffff,
ofproto.OFPP_ANY, 0xffffffff,
0, match, inst)
dp.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
dst, src, _eth_type = struct.unpack_from('!6s6sH', buffer(msg.data), 0)
dpid = datapath.id
self.mac_to_port.setdefault(dpid, {})
for field in msg.match.fields:
if field.header == ofproto.OXM_OF_IN_PORT:
in_port = field.value
LOG.info("packet in %s %s %s %s",
dpid, haddr_to_str(src), haddr_to_str(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 = [datapath.ofproto_parser.OFPActionOutput(out_port, 0)]
# install a flow to avoid packet_in next time
if out_port != ofproto.OFPP_FLOOD:
self.add_flow(datapath, in_port, dst, actions)
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath, buffer_id=msg.buffer_id, in_port=in_port,
actions=actions)
datapath.send_msg(out)
@set_ev_cls(ofp_event.EventOFPPortStatus, MAIN_DISPATCHER)
def _port_status_handler(self, ev):
msg = ev.msg
reason = msg.reason
port_no = msg.desc.port_no
ofproto = msg.datapath.ofproto
if reason == ofproto.OFPPR_ADD:
LOG.info("port added %s", port_no)
elif reason == ofproto.OFPPR_DELETE:
LOG.info("port deleted %s", port_no)
elif reason == ofproto.OFPPR_MODIFY:
LOG.info("port modified %s", port_no)
else:
LOG.info("Illeagal port state %s %s", port_no, reason)
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