1 # Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
16 from ryu.base import app_manager
17 from ryu.controller import ofp_event
18 from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
19 from ryu.controller.handler import set_ev_cls
20 from ryu.ofproto import ofproto_v1_3
21 from ryu.lib.packet import packet
22 from ryu.lib.packet import ethernet
23 from ryu.lib.packet import ether_types
26 class SimpleSwitch13(app_manager.RyuApp):
27 OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
29 def __init__(self, *args, **kwargs):
30 super(SimpleSwitch13, self).__init__(*args, **kwargs)
33 @set_ev_cls(ofp_event.EventOFPSwitchFeatures, CONFIG_DISPATCHER)
34 def switch_features_handler(self, ev):
35 datapath = ev.msg.datapath
36 ofproto = datapath.ofproto
37 parser = datapath.ofproto_parser
39 # install table-miss flow entry
41 # We specify NO BUFFER to max_len of the output action due to
42 # OVS bug. At this moment, if we specify a lesser number, e.g.,
43 # 128, OVS will send Packet-In with invalid buffer_id and
44 # truncated packet data. In that case, we cannot output packets
45 # correctly. The bug has been fixed in OVS v2.1.0.
46 match = parser.OFPMatch()
47 actions = [parser.OFPActionOutput(ofproto.OFPP_CONTROLLER,
48 ofproto.OFPCML_NO_BUFFER)]
49 self.add_flow(datapath, 0, match, actions)
51 def add_flow(self, datapath, priority, match, actions, buffer_id=None):
52 ofproto = datapath.ofproto
53 parser = datapath.ofproto_parser
55 inst = [parser.OFPInstructionActions(ofproto.OFPIT_APPLY_ACTIONS,
58 mod = parser.OFPFlowMod(datapath=datapath, buffer_id=buffer_id,
59 priority=priority, match=match,
62 mod = parser.OFPFlowMod(datapath=datapath, priority=priority,
63 match=match, instructions=inst)
64 datapath.send_msg(mod)
66 @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
67 def _packet_in_handler(self, ev):
68 # If you hit this you might want to increase
69 # the "miss_send_length" of your switch
70 if ev.msg.msg_len < ev.msg.total_len:
71 self.logger.debug("packet truncated: only %s of %s bytes",
72 ev.msg.msg_len, ev.msg.total_len)
74 datapath = msg.datapath
75 ofproto = datapath.ofproto
76 parser = datapath.ofproto_parser
77 in_port = msg.match['in_port']
79 pkt = packet.Packet(msg.data)
80 eth = pkt.get_protocols(ethernet.ethernet)[0]
82 if eth.ethertype == ether_types.ETH_TYPE_LLDP:
89 self.mac_to_port.setdefault(dpid, {})
91 self.logger.info("packet in %s %s %s %s", dpid, src, dst, in_port)
93 # learn a mac address to avoid FLOOD next time.
94 self.mac_to_port[dpid][src] = in_port
96 if dst in self.mac_to_port[dpid]:
97 out_port = self.mac_to_port[dpid][dst]
99 out_port = ofproto.OFPP_FLOOD
101 actions = [parser.OFPActionOutput(out_port)]
103 # install a flow to avoid packet_in next time
104 if out_port != ofproto.OFPP_FLOOD:
105 match = parser.OFPMatch(in_port=in_port, eth_dst=dst, eth_src=src)
106 # verify if we have a valid buffer_id, if yes avoid to send both
107 # flow_mod & packet_out
108 if msg.buffer_id != ofproto.OFP_NO_BUFFER:
109 self.add_flow(datapath, 1, match, actions, msg.buffer_id)
112 self.add_flow(datapath, 1, match, actions)
114 if msg.buffer_id == ofproto.OFP_NO_BUFFER:
117 out = parser.OFPPacketOut(datapath=datapath, buffer_id=msg.buffer_id,
118 in_port=in_port, actions=actions, data=data)
119 datapath.send_msg(out)