os-ken/ryu/app/simple_switch_stp.py
Yuichi Ito d0cd13a660 stplib: reduce unnecessary constant
and correct the inaccurate dispatchers.

Signed-off-by: Yuichi Ito <ito.yuichi0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
2014-03-30 10:43:52 +09:00

134 lines
4.9 KiB
Python

# Copyright (C) 2013 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 struct
from ryu.base import app_manager
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.ofproto import ofproto_v1_0
from ryu.lib import dpid as dpid_lib
from ryu.lib import stplib
from ryu.lib.mac import haddr_to_str
class SimpleSwitchStp(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION]
_CONTEXTS = {'stplib': stplib.Stp}
def __init__(self, *args, **kwargs):
super(SimpleSwitchStp, self).__init__(*args, **kwargs)
self.mac_to_port = {}
self.stp = kwargs['stplib']
# Sample of stplib config.
# please refer to stplib.Stp.set_config() for details.
"""
config = {dpid_lib.str_to_dpid('0000000000000001'):
{'bridge': {'priority': 0x8000,
'max_age': 10},
'ports': {1: {'priority': 0x80},
2: {'priority': 0x90}}},
dpid_lib.str_to_dpid('0000000000000002'):
{'bridge': {'priority': 0x9000}}}
self.stp.set_config(config)
"""
def add_flow(self, datapath, in_port, dst, actions):
ofproto = datapath.ofproto
wildcards = ofproto_v1_0.OFPFW_ALL
wildcards &= ~ofproto_v1_0.OFPFW_IN_PORT
wildcards &= ~ofproto_v1_0.OFPFW_DL_DST
match = datapath.ofproto_parser.OFPMatch(
wildcards, in_port, 0, dst,
0, 0, 0, 0, 0, 0, 0, 0, 0)
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0,
command=ofproto.OFPFC_ADD, idle_timeout=0, hard_timeout=0,
priority=ofproto.OFP_DEFAULT_PRIORITY,
flags=ofproto.OFPFF_SEND_FLOW_REM, actions=actions)
datapath.send_msg(mod)
def delete_flow(self, datapath):
ofproto = datapath.ofproto
wildcards = ofproto_v1_0.OFPFW_ALL
match = datapath.ofproto_parser.OFPMatch(
wildcards, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
mod = datapath.ofproto_parser.OFPFlowMod(
datapath=datapath, match=match, cookie=0,
command=ofproto.OFPFC_DELETE)
datapath.send_msg(mod)
@set_ev_cls(stplib.EventPacketIn, 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, {})
self.logger.debug("packet in %s %s %s %s",
dpid, haddr_to_str(src), haddr_to_str(dst),
msg.in_port)
# learn a mac address to avoid FLOOD next time.
self.mac_to_port[dpid][src] = msg.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)]
# install a flow to avoid packet_in next time
if out_port != ofproto.OFPP_FLOOD:
self.add_flow(datapath, msg.in_port, dst, actions)
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
actions=actions)
datapath.send_msg(out)
@set_ev_cls(stplib.EventTopologyChange, MAIN_DISPATCHER)
def _topology_change_handler(self, ev):
dp = ev.dp
dpid_str = dpid_lib.dpid_to_str(dp.id)
msg = 'Receive topology change event. Flush MAC table.'
self.logger.debug("[dpid=%s] %s", dpid_str, msg)
if dp.id in self.mac_to_port:
del self.mac_to_port[dp.id]
self.delete_flow(dp)
@set_ev_cls(stplib.EventPortStateChange, MAIN_DISPATCHER)
def _port_state_change_handler(self, ev):
dpid_str = dpid_lib.dpid_to_str(ev.dp.id)
of_state = {stplib.PORT_STATE_DISABLE: 'DISABLE',
stplib.PORT_STATE_BLOCK: 'BLOCK',
stplib.PORT_STATE_LISTEN: 'LISTEN',
stplib.PORT_STATE_LEARN: 'LEARN',
stplib.PORT_STATE_FORWARD: 'FORWARD'}
self.logger.debug("[dpid=%s][port=%d] state=%s",
dpid_str, ev.port_no, of_state[ev.port_state])