134 lines
4.9 KiB
Python
134 lines
4.9 KiB
Python
# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import struct
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from os_ken.base import app_manager
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from os_ken.controller.handler import MAIN_DISPATCHER
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from os_ken.controller.handler import set_ev_cls
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from os_ken.ofproto import ofproto_v1_0
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from os_ken.lib import dpid as dpid_lib
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from os_ken.lib import stplib
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from os_ken.lib.mac import haddr_to_str
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class SimpleSwitchStp(app_manager.OSKenApp):
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OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
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_CONTEXTS = {'stplib': stplib.Stp}
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def __init__(self, *args, **kwargs):
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super(SimpleSwitchStp, self).__init__(*args, **kwargs)
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self.mac_to_port = {}
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self.stp = kwargs['stplib']
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# Sample of stplib config.
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# please refer to stplib.Stp.set_config() for details.
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"""
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config = {dpid_lib.str_to_dpid('0000000000000001'):
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{'bridge': {'priority': 0x8000,
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'max_age': 10},
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'ports': {1: {'priority': 0x80},
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2: {'priority': 0x90}}},
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dpid_lib.str_to_dpid('0000000000000002'):
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{'bridge': {'priority': 0x9000}}}
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self.stp.set_config(config)
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"""
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def add_flow(self, datapath, in_port, dst, actions):
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ofproto = datapath.ofproto
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wildcards = ofproto_v1_0.OFPFW_ALL
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wildcards &= ~ofproto_v1_0.OFPFW_IN_PORT
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wildcards &= ~ofproto_v1_0.OFPFW_DL_DST
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match = datapath.ofproto_parser.OFPMatch(
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wildcards, in_port, 0, dst,
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0, 0, 0, 0, 0, 0, 0, 0, 0)
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mod = datapath.ofproto_parser.OFPFlowMod(
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datapath=datapath, match=match, cookie=0,
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command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
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priority=ofproto.OFP_DEFAULT_PRIORITY,
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flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
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datapath.send_msg(mod)
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def delete_flow(self, datapath):
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ofproto = datapath.ofproto
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wildcards = ofproto_v1_0.OFPFW_ALL
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match = datapath.ofproto_parser.OFPMatch(
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wildcards, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
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mod = datapath.ofproto_parser.OFPFlowMod(
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datapath=datapath, match=match, cookie=0,
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command=ofproto.OFPFC_DELETE)
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datapath.send_msg(mod)
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@set_ev_cls(stplib.EventPacketIn, MAIN_DISPATCHER)
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def packet_in_handler(self, ev):
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msg = ev.msg
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datapath = msg.datapath
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ofproto = datapath.ofproto
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dst, src, _eth_type = struct.unpack_from('!6s6sH', buffer(msg.data), 0)
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dpid = datapath.id
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self.mac_to_port.setdefault(dpid, {})
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self.logger.debug("packet in %s %s %s %s",
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dpid, haddr_to_str(src), haddr_to_str(dst),
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msg.in_port)
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# learn a mac address to avoid FLOOD next time.
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self.mac_to_port[dpid][src] = msg.in_port
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if dst in self.mac_to_port[dpid]:
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out_port = self.mac_to_port[dpid][dst]
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else:
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out_port = ofproto.OFPP_FLOOD
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actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
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# install a flow to avoid packet_in next time
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if out_port != ofproto.OFPP_FLOOD:
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self.add_flow(datapath, msg.in_port, dst, actions)
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out = datapath.ofproto_parser.OFPPacketOut(
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datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
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actions=actions)
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datapath.send_msg(out)
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@set_ev_cls(stplib.EventTopologyChange, MAIN_DISPATCHER)
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def _topology_change_handler(self, ev):
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dp = ev.dp
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dpid_str = dpid_lib.dpid_to_str(dp.id)
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msg = 'Receive topology change event. Flush MAC table.'
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self.logger.debug("[dpid=%s] %s", dpid_str, msg)
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if dp.id in self.mac_to_port:
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del self.mac_to_port[dp.id]
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self.delete_flow(dp)
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@set_ev_cls(stplib.EventPortStateChange, MAIN_DISPATCHER)
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def _port_state_change_handler(self, ev):
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dpid_str = dpid_lib.dpid_to_str(ev.dp.id)
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of_state = {stplib.PORT_STATE_DISABLE: 'DISABLE',
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stplib.PORT_STATE_BLOCK: 'BLOCK',
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stplib.PORT_STATE_LISTEN: 'LISTEN',
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stplib.PORT_STATE_LEARN: 'LEARN',
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stplib.PORT_STATE_FORWARD: 'FORWARD'}
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self.logger.debug("[dpid=%s][port=%d] state=%s",
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dpid_str, ev.port_no, of_state[ev.port_state])
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