diff options
author | Thomas Boros <tomas.boros92@gmail.com> | 2017-11-28 10:42:11 +0900 |
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committer | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2017-11-28 10:48:26 +0900 |
commit | 9aa56ef3bdf8ef6adeaf5c20418de603b69f3658 (patch) | |
tree | 2c5224286c870286e122170f5857ee8c26ad1bb7 | |
parent | 4d2638791024e5b7eb71047c4416793c1d74023c (diff) |
app: added simple switch with openflow 1.5 support
Signed-off-by: Thomas Boros <tomas.boros92@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
-rw-r--r-- | ryu/app/simple_switch_15.py | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/ryu/app/simple_switch_15.py b/ryu/app/simple_switch_15.py new file mode 100644 index 00000000..6a86ba79 --- /dev/null +++ b/ryu/app/simple_switch_15.py @@ -0,0 +1,107 @@ +# 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_5 +from ryu.lib.packet import packet +from ryu.lib.packet import ethernet +from ryu.lib.packet import ether_types + + +class SimpleSwitch15(app_manager.RyuApp): + OFP_VERSIONS = [ofproto_v1_5.OFP_VERSION] + + def __init__(self, *args, **kwargs): + super(SimpleSwitch15, 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): + ofproto = datapath.ofproto + parser = datapath.ofproto_parser + + inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS, + actions)] + + mod = parser.OFPFlowMod(datapath=datapath, priority=priority, + match=match, instructions=inst) + 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 + in_port = msg.match['in_port'] + + 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 + + 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) + self.add_flow(datapath, 1, match, actions) + + data = None + if msg.buffer_id == ofproto.OFP_NO_BUFFER: + data = msg.data + + match = parser.OFPMatch(in_port=in_port) + + out = parser.OFPPacketOut(datapath=datapath, buffer_id=msg.buffer_id, + match=match, actions=actions, data=data) + datapath.send_msg(out) |