openstack/os-ken
Code Issues Proposed changes
62170fba87
os-ken/ryu/app/rest_router.py
YAMAMOTO Takashi 242f3023ea rest_router: make pep8 comfortable 
Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
2013-09-02 14:01:17 +09:00

1860 lines
66 KiB
Python
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# 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 logging
import socket
import struct
import json
from webob import Response
from ryu.app.wsgi import ControllerBase
from ryu.app.wsgi import WSGIApplication
from ryu.base import app_manager
from ryu.controller import dpset
from ryu.controller import ofp_event
from ryu.controller.handler import set_ev_cls
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.exception import OFPUnknownVersion
from ryu.exception import RyuException
from ryu.lib import dpid as dpid_lib
from ryu.lib import hub
from ryu.lib import mac as mac_lib
from ryu.lib import addrconv
from ryu.lib.packet import arp
from ryu.lib.packet import ethernet
from ryu.lib.packet import icmp
from ryu.lib.packet import ipv4
from ryu.lib.packet import packet
from ryu.lib.packet import tcp
from ryu.lib.packet import udp
from ryu.lib.packet import vlan
from ryu.ofproto import ether
from ryu.ofproto import inet
from ryu.ofproto import ofproto_v1_0
from ryu.ofproto import ofproto_v1_2
#=============================
# REST API
#=============================
#
# Note: specify switch and vlan group, as follows.
# {switch_id} : 'all' or switchID
# {vlan_id} : 'all' or vlanID
#
#
## 1. get address data and routing data.
#
# * get data of no vlan
# GET /router/{switch_id}
#
# * get data of specific vlan group
# GET /router/{switch_id}/{vlan_id}
#
#
## 2. set address data or routing data.
#
# * set data of no vlan
# POST /router/{switch_id}
#
# * set data of specific vlan group
# POST /router/{switch_id}/{vlan_id}
#
# case1: set address data.
# parameter = {"address": "A.B.C.D/M"}
# case2-1: set static route.
# parameter = {"destination": "A.B.C.D/M", "gateway": "E.F.G.H"}
# case2-2: set default route.
# parameter = {"gateway": "E.F.G.H"}
#
#
## 3. delete address data or routing data.
#
# * delete data of no vlan
# DELETE /router/{switch_id}
#
# * delete data of specific vlan group
# DELETE /router/{switch_id}/{vlan_id}
#
# case1: delete address data.
# parameter = {"address_id": "<int>"} or {"address_id": "all"}
# case2: delete routing data.
# parameter = {"route_id": "<int>"} or {"route_id": "all"}
#
#
UINT16_MAX = 0xffff
UINT32_MAX = 0xffffffff
UINT64_MAX = 0xffffffffffffffff
ETHERNET = ethernet.ethernet.__name__
VLAN = vlan.vlan.__name__
IPV4 = ipv4.ipv4.__name__
ARP = arp.arp.__name__
ICMP = icmp.icmp.__name__
TCP = tcp.tcp.__name__
UDP = udp.udp.__name__
MAX_SUSPENDPACKETS = 50 # Threshold of the packet suspends thread count.
ARP_REPLY_TIMER = 2 # sec
OFP_REPLY_TIMER = 1.0 # sec
CHK_ROUTING_TBL_INTERVAL = 1800 # sec
SWITCHID_PATTERN = dpid_lib.DPID_PATTERN + r'|all'
VLANID_PATTERN = r'[0-9]{1,4}|all'
VLANID_NONE = 0
VLANID_MIN = 2
VLANID_MAX = 4094
COOKIE_DEFAULT_ID = 0
COOKIE_SHIFT_VLANID = 32
COOKIE_SHIFT_ROUTEID = 16
DEFAULT_ROUTE = '0.0.0.0/0'
IDLE_TIMEOUT = 1800 # sec
DEFAULT_TTL = 64
REST_COMMAND_RESULT = 'command_result'
REST_RESULT = 'result'
REST_DETAILS = 'details'
REST_OK = 'success'
REST_NG = 'failure'
REST_ALL = 'all'
REST_SWITCHID = 'switch_id'
REST_VLANID = 'vlan_id'
REST_NW = 'internal_network'
REST_ADDRESSID = 'address_id'
REST_ADDRESS = 'address'
REST_ROUTEID = 'route_id'
REST_ROUTE = 'route'
REST_DESTINATION = 'destination'
REST_GATEWAY = 'gateway'
PRIORITY_VLAN_SHIFT = 1000
PRIORITY_NETMASK_SHIFT = 32
PRIORITY_NORMAL = 0
PRIORITY_ARP_HANDLING = 1
PRIORITY_DEFAULT_ROUTING = 1
PRIORITY_MAC_LEARNING = 2
PRIORITY_STATIC_ROUTING = 2
PRIORITY_IMPLICIT_ROUTING = 3
PRIORITY_L2_SWITCHING = 4
PRIORITY_IP_HANDLING = 5
PRIORITY_TYPE_ROUTE = 'priority_route'
def get_priority(priority_type, vid=0, route=None):
log_msg = None
priority = priority_type
if priority_type == PRIORITY_TYPE_ROUTE:
assert route is not None
if route.dst_ip:
priority_type = PRIORITY_STATIC_ROUTING
priority = priority_type + route.netmask
log_msg = 'static routing'
else:
priority_type = PRIORITY_DEFAULT_ROUTING
priority = priority_type
log_msg = 'default routing'
if vid or priority_type == PRIORITY_IP_HANDLING:
priority += PRIORITY_VLAN_SHIFT
if priority_type > PRIORITY_STATIC_ROUTING:
priority += PRIORITY_NETMASK_SHIFT
if log_msg is None:
return priority
else:
return priority, log_msg
def get_priority_type(priority, vid):
if vid:
priority -= PRIORITY_VLAN_SHIFT
return priority
class NotFoundError(RyuException):
message = 'Router SW is not connected. : switch_id=%(switch_id)s'
class CommandFailure(RyuException):
pass
class RestRouterAPI(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_0.OFP_VERSION,
ofproto_v1_2.OFP_VERSION]
_CONTEXTS = {'dpset': dpset.DPSet,
'wsgi': WSGIApplication}
def __init__(self, *args, **kwargs):
super(RestRouterAPI, self).__init__(*args, **kwargs)
# logger configure
RouterController.set_logger(self.logger)
wsgi = kwargs['wsgi']
self.waiters = {}
self.data = {'waiters': self.waiters}
mapper = wsgi.mapper
wsgi.registory['RouterController'] = self.data
requirements = {'switch_id': SWITCHID_PATTERN,
'vlan_id': VLANID_PATTERN}
# For no vlan data
path = '/router/{switch_id}'
mapper.connect('router', path, controller=RouterController,
requirements=requirements,
action='get_data',
conditions=dict(method=['GET']))
mapper.connect('router', path, controller=RouterController,
requirements=requirements,
action='set_data',
conditions=dict(method=['POST']))
mapper.connect('router', path, controller=RouterController,
requirements=requirements,
action='delete_data',
conditions=dict(method=['DELETE']))
# For vlan data
path = '/router/{switch_id}/{vlan_id}'
mapper.connect('router', path, controller=RouterController,
requirements=requirements,
action='get_vlan_data',
conditions=dict(method=['GET']))
mapper.connect('router', path, controller=RouterController,
requirements=requirements,
action='set_vlan_data',
conditions=dict(method=['POST']))
mapper.connect('router', path, controller=RouterController,
requirements=requirements,
action='delete_vlan_data',
conditions=dict(method=['DELETE']))
@set_ev_cls(dpset.EventDP, dpset.DPSET_EV_DISPATCHER)
def datapath_handler(self, ev):
if ev.enter:
RouterController.register_router(ev.dp)
else:
RouterController.unregister_router(ev.dp)
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def packet_in_handler(self, ev):
RouterController.packet_in_handler(ev.msg)
def _stats_reply_handler(self, ev):
msg = ev.msg
dp = msg.datapath
if (dp.id not in self.waiters
or msg.xid not in self.waiters[dp.id]):
return
event, msgs = self.waiters[dp.id][msg.xid]
msgs.append(msg)
if msg.flags & dp.ofproto.OFPSF_REPLY_MORE:
return
del self.waiters[dp.id][msg.xid]
event.set()
# for OpenFlow version1.0
@set_ev_cls(ofp_event.EventOFPFlowStatsReply, MAIN_DISPATCHER)
def stats_reply_handler_v1_0(self, ev):
self._stats_reply_handler(ev)
# for OpenFlow version1.2
@set_ev_cls(ofp_event.EventOFPStatsReply, MAIN_DISPATCHER)
def stats_reply_handler_v1_2(self, ev):
self._stats_reply_handler(ev)
#TODO: Update routing table when port status is changed.
# REST command template
def rest_command(func):
def _rest_command(*args, **kwargs):
try:
msg = func(*args, **kwargs)
return Response(content_type='application/json',
body=json.dumps(msg))
except SyntaxError as e:
status = 400
details = e.msg
except (ValueError, NameError) as e:
status = 400
details = e.message
except NotFoundError as msg:
status = 404
details = str(msg)
msg = {REST_RESULT: REST_NG,
REST_DETAILS: details}
return Response(status=status, body=json.dumps(msg))
return _rest_command
class RouterController(ControllerBase):
_ROUTER_LIST = {}
_LOGGER = None
def __init__(self, req, link, data, **config):
super(RouterController, self).__init__(req, link, data, **config)
self.waiters = data['waiters']
@classmethod
def set_logger(cls, logger):
cls._LOGGER = logger
cls._LOGGER.propagate = False
hdlr = logging.StreamHandler()
fmt_str = '[RT][%(levelname)s] switch_id=%(sw_id)s: %(message)s'
hdlr.setFormatter(logging.Formatter(fmt_str))
cls._LOGGER.addHandler(hdlr)
@classmethod
def register_router(cls, dp):
dpid = {'sw_id': dpid_lib.dpid_to_str(dp.id)}
try:
router = Router(dp, cls._LOGGER)
except OFPUnknownVersion as message:
cls._LOGGER.error(str(message), extra=dpid)
return
cls._ROUTER_LIST.setdefault(dp.id, router)
cls._LOGGER.info('Join as router.', extra=dpid)
@classmethod
def unregister_router(cls, dp):
if dp.id in cls._ROUTER_LIST:
cls._ROUTER_LIST[dp.id].delete()
del cls._ROUTER_LIST[dp.id]
dpid = {'sw_id': dpid_lib.dpid_to_str(dp.id)}
cls._LOGGER.info('Leave router.', extra=dpid)
@classmethod
def packet_in_handler(cls, msg):
dp_id = msg.datapath.id
if dp_id in cls._ROUTER_LIST:
router = cls._ROUTER_LIST[dp_id]
router.packet_in_handler(msg)
# GET /router/{switch_id}
@rest_command
def get_data(self, req, switch_id, **_kwargs):
return self._access_router(switch_id, VLANID_NONE,
'get_data', req.body)
# GET /router/{switch_id}/{vlan_id}
@rest_command
def get_vlan_data(self, req, switch_id, vlan_id, **_kwargs):
return self._access_router(switch_id, vlan_id,
'get_data', req.body)
# POST /router/{switch_id}
@rest_command
def set_data(self, req, switch_id, **_kwargs):
return self._access_router(switch_id, VLANID_NONE,
'set_data', req.body)
# POST /router/{switch_id}/{vlan_id}
@rest_command
def set_vlan_data(self, req, switch_id, vlan_id, **_kwargs):
return self._access_router(switch_id, vlan_id,
'set_data', req.body)
# DELETE /router/{switch_id}
@rest_command
def delete_data(self, req, switch_id, **_kwargs):
return self._access_router(switch_id, VLANID_NONE,
'delete_data', req.body)
# DELETE /router/{switch_id}/{vlan_id}
@rest_command
def delete_vlan_data(self, req, switch_id, vlan_id, **_kwargs):
return self._access_router(switch_id, vlan_id,
'delete_data', req.body)
def _access_router(self, switch_id, vlan_id, func, rest_param):
rest_message = []
routers = self._get_router(switch_id)
param = eval(rest_param) if rest_param else {}
for router in routers.values():
function = getattr(router, func)
data = function(vlan_id, param, self.waiters)
rest_message.append(data)
return rest_message
def _get_router(self, switch_id):
routers = {}
if switch_id == REST_ALL:
routers = self._ROUTER_LIST
else:
sw_id = dpid_lib.str_to_dpid(switch_id)
if sw_id in self._ROUTER_LIST:
routers = {sw_id: self._ROUTER_LIST[sw_id]}
if routers:
return routers
else:
raise NotFoundError(switch_id=switch_id)
class Router(dict):
def __init__(self, dp, logger):
super(Router, self).__init__()
self.dp = dp
self.dpid_str = dpid_lib.dpid_to_str(dp.id)
self.sw_id = {'sw_id': self.dpid_str}
self.logger = logger
self.port_data = PortData(dp.ports)
ofctl = OfCtl.factory(dp, logger)
cookie = COOKIE_DEFAULT_ID
# Set SW config: TTL error packet in (only OFPv1.2)
ofctl.set_sw_config_for_ttl()
# Set flow: ARP handling (packet in)
priority = get_priority(PRIORITY_ARP_HANDLING)
ofctl.set_packetin_flow(cookie, priority, dl_type=ether.ETH_TYPE_ARP)
self.logger.info('Set ARP handling (packet in) flow [cookie=0x%x]',
cookie, extra=self.sw_id)
# Set flow: L2 switching (normal)
priority = get_priority(PRIORITY_NORMAL)
ofctl.set_normal_flow(cookie, priority)
self.logger.info('Set L2 switching (normal) flow [cookie=0x%x]',
cookie, extra=self.sw_id)
# Set VlanRouter for vid=None.
vlan_router = VlanRouter(VLANID_NONE, dp, self.port_data, logger)
self[VLANID_NONE] = vlan_router
# Start cyclic routing table check.
self.thread = hub.spawn(self._cyclic_update_routing_tbl)
self.logger.info('Start cyclic routing table update.',
extra=self.sw_id)
def delete(self):
hub.kill(self.thread)
self.thread.wait()
self.logger.info('Stop cyclic routing table update.',
extra=self.sw_id)
def _get_vlan_router(self, vlan_id):
vlan_routers = []
if vlan_id == REST_ALL:
vlan_routers = self.values()
else:
vlan_id = int(vlan_id)
if (vlan_id != VLANID_NONE and
(vlan_id < VLANID_MIN or VLANID_MAX < vlan_id)):
msg = 'Invalid {vlan_id} value. Set [%d-%d]'
raise ValueError(msg % (VLANID_MIN, VLANID_MAX))
elif vlan_id in self:
vlan_routers = [self[vlan_id]]
return vlan_routers
def _add_vlan_router(self, vlan_id):
vlan_id = int(vlan_id)
if vlan_id not in self:
vlan_router = VlanRouter(vlan_id, self.dp, self.port_data,
self.logger)
self[vlan_id] = vlan_router
return self[vlan_id]
def _del_vlan_router(self, vlan_id, waiters):
# Remove unnecessary VlanRouter.
if vlan_id == VLANID_NONE:
return
vlan_router = self[vlan_id]
if (len(vlan_router.address_data) == 0
and len(vlan_router.routing_tbl) == 0):
vlan_router.delete(waiters)
del self[vlan_id]
def get_data(self, vlan_id, dummy1, dummy2):
vlan_routers = self._get_vlan_router(vlan_id)
if vlan_routers:
msgs = [vlan_router.get_data() for vlan_router in vlan_routers]
else:
msgs = [{REST_VLANID: vlan_id}]
return {REST_SWITCHID: self.dpid_str,
REST_NW: msgs}
def set_data(self, vlan_id, param, waiters):
vlan_routers = self._get_vlan_router(vlan_id)
if not vlan_routers:
vlan_routers = [self._add_vlan_router(vlan_id)]
msgs = []
for vlan_router in vlan_routers:
try:
msg = vlan_router.set_data(param)
msgs.append(msg)
if msg[REST_RESULT] == REST_NG:
# Data setting is failure.
self._del_vlan_router(vlan_router.vlan_id, waiters)
except ValueError as err_msg:
# Data setting is failure.
self._del_vlan_router(vlan_router.vlan_id, waiters)
raise err_msg
return {REST_SWITCHID: self.dpid_str,
REST_COMMAND_RESULT: msgs}
def delete_data(self, vlan_id, param, waiters):
msgs = []
vlan_routers = self._get_vlan_router(vlan_id)
if vlan_routers:
for vlan_router in vlan_routers:
msg = vlan_router.delete_data(param, waiters)
if msg:
msgs.append(msg)
# Check unnecessary VlanRouter.
self._del_vlan_router(vlan_router.vlan_id, waiters)
if not msgs:
msgs = [{REST_RESULT: REST_NG,
REST_DETAILS: 'Data is nothing.'}]
return {REST_SWITCHID: self.dpid_str,
REST_COMMAND_RESULT: msgs}
def packet_in_handler(self, msg):
pkt = packet.Packet(msg.data)
#TODO: Packet library convert to string
#self.logger.debug('Packet in = %s', str(pkt), self.sw_id)
header_list = dict((p.protocol_name, p)
for p in pkt.protocols if type(p) != str)
if header_list:
# Check vlan-tag
vlan_id = VLANID_NONE
if VLAN in header_list:
vlan_id = header_list[VLAN].vid
# Event dispatch
if vlan_id in self:
self[vlan_id].packet_in_handler(msg, header_list)
else:
self.logger.debug('Drop unknown vlan packet. [vlan_id=%d]',
vlan_id, extra=self.sw_id)
def _cyclic_update_routing_tbl(self):
while True:
# send ARP to all gateways.
for vlan_router in self.values():
vlan_router.send_arp_all_gw()
hub.sleep(1)
hub.sleep(CHK_ROUTING_TBL_INTERVAL)
class VlanRouter(object):
def __init__(self, vlan_id, dp, port_data, logger):
super(VlanRouter, self).__init__()
self.vlan_id = vlan_id
self.dp = dp
self.sw_id = {'sw_id': dpid_lib.dpid_to_str(dp.id)}
self.logger = logger
self.port_data = port_data
self.address_data = AddressData()
self.routing_tbl = RoutingTable()
self.packet_buffer = SuspendPacketList(self.send_icmp_unreach_error)
self.ofctl = OfCtl.factory(dp, logger)
# Set flow: default route (drop)
self._set_defaultroute_drop()
def delete(self, waiters):
# Delete flow.
msgs = self.ofctl.get_all_flow(waiters)
for msg in msgs:
for stats in msg.body:
vlan_id = VlanRouter._cookie_to_id(REST_VLANID, stats.cookie)
if vlan_id == self.vlan_id:
self.ofctl.delete_flow(stats)
assert len(self.packet_buffer) == 0
@staticmethod
def _cookie_to_id(id_type, cookie):
if id_type == REST_VLANID:
rest_id = cookie >> COOKIE_SHIFT_VLANID
elif id_type == REST_ADDRESSID:
rest_id = cookie & UINT32_MAX
else:
assert id_type == REST_ROUTEID
rest_id = (cookie & UINT32_MAX) >> COOKIE_SHIFT_ROUTEID
return rest_id
def _id_to_cookie(self, id_type, rest_id):
vid = self.vlan_id << COOKIE_SHIFT_VLANID
if id_type == REST_VLANID:
cookie = rest_id << COOKIE_SHIFT_VLANID
elif id_type == REST_ADDRESSID:
cookie = vid + rest_id
else:
assert id_type == REST_ROUTEID
cookie = vid + (rest_id << COOKIE_SHIFT_ROUTEID)
return cookie
def _get_priority(self, priority_type, route=None):
return get_priority(priority_type, vid=self.vlan_id, route=route)
def _response(self, msg):
if msg and self.vlan_id:
msg.setdefault(REST_VLANID, self.vlan_id)
return msg
def get_data(self):
address_data = self._get_address_data()
routing_data = self._get_routing_data()
data = {}
if address_data[REST_ADDRESS]:
data.update(address_data)
if routing_data[REST_ROUTE]:
data.update(routing_data)
return self._response(data)
def _get_address_data(self):
address_data = []
for value in self.address_data.values():
default_gw = ip_addr_ntoa(value.default_gw)
address = '%s/%d' % (default_gw, value.netmask)
data = {REST_ADDRESSID: value.address_id,
REST_ADDRESS: address}
address_data.append(data)
return {REST_ADDRESS: address_data}
def _get_routing_data(self):
routing_data = []
for key, value in self.routing_tbl.items():
if value.gateway_mac is not None:
gateway = ip_addr_ntoa(value.gateway_ip)
data = {REST_ROUTEID: value.route_id,
REST_DESTINATION: key,
REST_GATEWAY: gateway}
routing_data.append(data)
return {REST_ROUTE: routing_data}
def set_data(self, data):
details = None
try:
# Set address data
if REST_ADDRESS in data:
address = data[REST_ADDRESS]
address_id = self._set_address_data(address)
details = 'Add address [address_id=%d]' % address_id
# Set routing data
elif REST_GATEWAY in data:
gateway = data[REST_GATEWAY]
if REST_DESTINATION in data:
destination = data[REST_DESTINATION]
else:
destination = DEFAULT_ROUTE
route_id = self._set_routing_data(destination, gateway)
details = 'Add route [route_id=%d]' % route_id
except CommandFailure as err_msg:
msg = {REST_RESULT: REST_NG, REST_DETAILS: str(err_msg)}
return self._response(msg)
if details is not None:
msg = {REST_RESULT: REST_OK, REST_DETAILS: details}
return self._response(msg)
else:
raise ValueError('Invalid parameter.')
def _set_address_data(self, address):
address = self.address_data.add(address)
cookie = self._id_to_cookie(REST_ADDRESSID, address.address_id)
# Set flow: host MAC learning (packet in)
priority = self._get_priority(PRIORITY_MAC_LEARNING)
self.ofctl.set_packetin_flow(cookie, priority,
dl_type=ether.ETH_TYPE_IP,
dl_vlan=self.vlan_id,
dst_ip=address.nw_addr,
dst_mask=address.netmask)
log_msg = 'Set host MAC learning (packet in) flow [cookie=0x%x]'
self.logger.info(log_msg, cookie, extra=self.sw_id)
# set Flow: IP handling(PacketIn)
priority = self._get_priority(PRIORITY_IP_HANDLING)
self.ofctl.set_packetin_flow(cookie, priority,
dl_type=ether.ETH_TYPE_IP,
dl_vlan=self.vlan_id,
dst_ip=address.default_gw)
self.logger.info('Set IP handling (packet in) flow [cookie=0x%x]',
cookie, extra=self.sw_id)
# Set flow: L2 switching (normal)
outport = self.ofctl.dp.ofproto.OFPP_NORMAL
priority = self._get_priority(PRIORITY_L2_SWITCHING)
self.ofctl.set_routing_flow(
cookie, priority, outport, dl_vlan=self.vlan_id,
nw_src=address.nw_addr, src_mask=address.netmask,
nw_dst=address.nw_addr, dst_mask=address.netmask)
self.logger.info('Set L2 switching (normal) flow [cookie=0x%x]',
cookie, extra=self.sw_id)
# Send GARP
self.send_arp_request(address.default_gw, address.default_gw)
return address.address_id
def _set_routing_data(self, destination, gateway):
err_msg = 'Invalid [%s] value.' % REST_GATEWAY
dst_ip = ip_addr_aton(gateway, err_msg=err_msg)
address = self.address_data.get_data(ip=dst_ip)
if address is None:
msg = 'Gateway=%s\'s address is not registered.' % gateway
raise CommandFailure(msg=msg)
elif dst_ip == address.default_gw:
msg = 'Gateway=%s is used as default gateway of address_id=%d'\
% (gateway, address.address_id)
raise CommandFailure(msg=msg)
else:
src_ip = address.default_gw
route = self.routing_tbl.add(destination, gateway)
self._set_route_packetin(route)
self.send_arp_request(src_ip, dst_ip)
return route.route_id
def _set_defaultroute_drop(self):
cookie = self._id_to_cookie(REST_VLANID, self.vlan_id)
priority = self._get_priority(PRIORITY_DEFAULT_ROUTING)
outport = None # for drop
self.ofctl.set_routing_flow(cookie, priority, outport,
dl_vlan=self.vlan_id)
self.logger.info('Set default route (drop) flow [cookie=0x%x]',
cookie, extra=self.sw_id)
def _set_route_packetin(self, route):
cookie = self._id_to_cookie(REST_ROUTEID, route.route_id)
priority, log_msg = self._get_priority(PRIORITY_TYPE_ROUTE,
route=route)
self.ofctl.set_packetin_flow(cookie, priority,
dl_type=ether.ETH_TYPE_IP,
dl_vlan=self.vlan_id,
dst_ip=route.dst_ip,
dst_mask=route.netmask)
self.logger.info('Set %s (packet in) flow [cookie=0x%x]', log_msg,
cookie, extra=self.sw_id)
def delete_data(self, data, waiters):
if REST_ROUTEID in data:
route_id = data[REST_ROUTEID]
msg = self._delete_routing_data(route_id, waiters)
elif REST_ADDRESSID in data:
address_id = data[REST_ADDRESSID]
msg = self._delete_address_data(address_id, waiters)
else:
raise ValueError('Invalid parameter.')
return self._response(msg)
def _delete_address_data(self, address_id, waiters):
if address_id != REST_ALL:
try:
address_id = int(address_id)
except ValueError as e:
err_msg = 'Invalid [%s] value. %s'
raise ValueError(err_msg % (REST_ADDRESSID, e.message))
skip_ids = self._chk_addr_relation_route(address_id)
# Get all flow.
delete_list = []
msgs = self.ofctl.get_all_flow(waiters)
max_id = UINT16_MAX
for msg in msgs:
for stats in msg.body:
vlan_id = VlanRouter._cookie_to_id(REST_VLANID, stats.cookie)
if vlan_id != self.vlan_id:
continue
addr_id = VlanRouter._cookie_to_id(REST_ADDRESSID,
stats.cookie)
if addr_id in skip_ids:
continue
elif address_id == REST_ALL:
if addr_id <= COOKIE_DEFAULT_ID or max_id < addr_id:
continue
elif address_id != addr_id:
continue
delete_list.append(stats)
delete_ids = []
for flow_stats in delete_list:
# Delete flow
self.ofctl.delete_flow(flow_stats)
address_id = VlanRouter._cookie_to_id(REST_ADDRESSID,
flow_stats.cookie)
del_address = self.address_data.get_data(addr_id=address_id)
if del_address is not None:
# Clean up suspend packet threads.
self.packet_buffer.delete(del_addr=del_address)
# Delete data.
self.address_data.delete(address_id)
if address_id not in delete_ids:
delete_ids.append(address_id)
msg = {}
if delete_ids:
delete_ids = ','.join(str(addr_id) for addr_id in delete_ids)
details = 'Delete address [address_id=%s]' % delete_ids
msg = {REST_RESULT: REST_OK, REST_DETAILS: details}
if skip_ids:
skip_ids = ','.join(str(addr_id) for addr_id in skip_ids)
details = 'Skip delete (related route exist) [address_id=%s]'\
% skip_ids
if msg:
msg[REST_DETAILS] += ', %s' % details
else:
msg = {REST_RESULT: REST_NG, REST_DETAILS: details}
return msg
def _delete_routing_data(self, route_id, waiters):
if route_id != REST_ALL:
try:
route_id = int(route_id)
except ValueError as e:
err_msg = 'Invalid [%s] value. %s'
raise ValueError(err_msg % (REST_ROUTEID, e.message))
# Get all flow.
msgs = self.ofctl.get_all_flow(waiters)
delete_list = []
for msg in msgs:
for stats in msg.body:
vlan_id = VlanRouter._cookie_to_id(REST_VLANID, stats.cookie)
if vlan_id != self.vlan_id:
continue
rt_id = VlanRouter._cookie_to_id(REST_ROUTEID, stats.cookie)
if route_id == REST_ALL:
if rt_id == COOKIE_DEFAULT_ID:
continue
elif route_id != rt_id:
continue
delete_list.append(stats)
# Delete flow.
delete_ids = []
for flow_stats in delete_list:
self.ofctl.delete_flow(flow_stats)
route_id = VlanRouter._cookie_to_id(REST_ROUTEID,
flow_stats.cookie)
self.routing_tbl.delete(route_id)
if route_id not in delete_ids:
delete_ids.append(route_id)
# case: Default route deleted. -> set flow (drop)
route_type = get_priority_type(flow_stats.priority,
vid=self.vlan_id)
if route_type == PRIORITY_DEFAULT_ROUTING:
self._set_defaultroute_drop()
msg = {}
if delete_ids:
delete_ids = ','.join(str(route_id) for route_id in delete_ids)
details = 'Delete route [route_id=%s]' % delete_ids
msg = {REST_RESULT: REST_OK, REST_DETAILS: details}
return msg
def _chk_addr_relation_route(self, address_id):
# Check exist of related routing data.
relate_list = []
gateways = self.routing_tbl.get_gateways()
for gateway in gateways:
address = self.address_data.get_data(ip=gateway)
if address is not None:
if (address_id == REST_ALL
and address.address_id not in relate_list):
relate_list.append(address.address_id)
elif address.address_id == address_id:
relate_list = [address_id]
break
return relate_list
def packet_in_handler(self, msg, header_list):
# Check invalid TTL (only OpenFlow V1.2)
ofproto = self.dp.ofproto
if ofproto.OFP_VERSION == ofproto_v1_2.OFP_VERSION:
if msg.reason == ofproto.OFPR_INVALID_TTL:
self._packetin_invalid_ttl(msg, header_list)
return
# Analyze event type.
if ARP in header_list:
self._packetin_arp(msg, header_list)
return
if IPV4 in header_list:
rt_ports = self.address_data.get_default_gw()
if header_list[IPV4].dst in rt_ports:
# Packet to router's port.
if ICMP in header_list:
if header_list[ICMP].type == icmp.ICMP_ECHO_REQUEST:
self._packetin_icmp_req(msg, header_list)
return
elif TCP in header_list or UDP in header_list:
self._packetin_tcp_udp(msg, header_list)
return
else:
# Packet to internal host or gateway router.
self._packetin_to_node(msg, header_list)
return
def _packetin_arp(self, msg, header_list):
src_addr = self.address_data.get_data(ip=header_list[ARP].src_ip)
if src_addr is None:
return
# case: Receive ARP from the gateway
# Update routing table.
# case: Receive ARP from an internal host
# Learning host MAC.
gw_flg = self._update_routing_tbl(msg, header_list)
if gw_flg is False:
self._learning_host_mac(msg, header_list)
# ARP packet handling.
in_port = self.ofctl.get_packetin_inport(msg)
src_ip = header_list[ARP].src_ip
dst_ip = header_list[ARP].dst_ip
srcip = ip_addr_ntoa(src_ip)
dstip = ip_addr_ntoa(dst_ip)
rt_ports = self.address_data.get_default_gw()
if src_ip == dst_ip:
# GARP -> packet forward (normal)
output = self.ofctl.dp.ofproto.OFPP_NORMAL
self.ofctl.send_packet_out(in_port, output, msg.data)
self.logger.info('Receive GARP from [%s].', srcip,
extra=self.sw_id)
self.logger.info('Send GARP (normal).', extra=self.sw_id)
elif dst_ip not in rt_ports:
dst_addr = self.address_data.get_data(ip=dst_ip)
if (dst_addr is not None and
src_addr.address_id == dst_addr.address_id):
# ARP from internal host -> packet forward (normal)
output = self.ofctl.dp.ofproto.OFPP_NORMAL
self.ofctl.send_packet_out(in_port, output, msg.data)
self.logger.info('Receive ARP from an internal host [%s].',
srcip, extra=self.sw_id)
self.logger.info('Send ARP (normal)', extra=self.sw_id)
else:
if header_list[ARP].opcode == arp.ARP_REQUEST:
# ARP request to router port -> send ARP reply
src_mac = header_list[ARP].src_mac
dst_mac = self.port_data[in_port].mac
arp_target_mac = dst_mac
output = in_port
in_port = self.ofctl.dp.ofproto.OFPP_CONTROLLER
self.ofctl.send_arp(arp.ARP_REPLY, self.vlan_id,
dst_mac, src_mac, dst_ip, src_ip,
arp_target_mac, in_port, output)
log_msg = 'Receive ARP request from [%s] to router port [%s].'
self.logger.info(log_msg, srcip, dstip, extra=self.sw_id)
self.logger.info('Send ARP reply to [%s]', srcip,
extra=self.sw_id)
elif header_list[ARP].opcode == arp.ARP_REPLY:
# ARP reply to router port -> suspend packets forward
log_msg = 'Receive ARP reply from [%s] to router port [%s].'
self.logger.info(log_msg, srcip, dstip, extra=self.sw_id)
packet_list = self.packet_buffer.get_data(src_ip)
if packet_list:
# stop ARP reply wait thread.
for suspend_packet in packet_list:
self.packet_buffer.delete(pkt=suspend_packet)
# send suspend packet.
output = self.ofctl.dp.ofproto.OFPP_TABLE
for suspend_packet in packet_list:
self.ofctl.send_packet_out(suspend_packet.in_port,
output,
suspend_packet.data)
self.logger.info('Send suspend packet to [%s].',
srcip, extra=self.sw_id)
def _packetin_icmp_req(self, msg, header_list):
# Send ICMP echo reply.
in_port = self.ofctl.get_packetin_inport(msg)
self.ofctl.send_icmp(in_port, header_list, self.vlan_id,
icmp.ICMP_ECHO_REPLY,
icmp.ICMP_ECHO_REPLY_CODE,
icmp_data=header_list[ICMP].data)
srcip = ip_addr_ntoa(header_list[IPV4].src)
dstip = ip_addr_ntoa(header_list[IPV4].dst)
log_msg = 'Receive ICMP echo request from [%s] to router port [%s].'
self.logger.info(log_msg, srcip, dstip, extra=self.sw_id)
self.logger.info('Send ICMP echo reply to [%s].', srcip,
extra=self.sw_id)
def _packetin_tcp_udp(self, msg, header_list):
# Send ICMP port unreach error.
in_port = self.ofctl.get_packetin_inport(msg)
self.ofctl.send_icmp(in_port, header_list, self.vlan_id,
icmp.ICMP_DEST_UNREACH,
icmp.ICMP_PORT_UNREACH_CODE,
msg_data=msg.data)
srcip = ip_addr_ntoa(header_list[IPV4].src)
dstip = ip_addr_ntoa(header_list[IPV4].dst)
self.logger.info('Receive TCP/UDP from [%s] to router port [%s].',
srcip, dstip, extra=self.sw_id)
self.logger.info('Send ICMP destination unreachable to [%s].', srcip,
extra=self.sw_id)
def _packetin_to_node(self, msg, header_list):
if len(self.packet_buffer) >= MAX_SUSPENDPACKETS:
self.logger.info('Packet is dropped, MAX_SUSPENDPACKETS exceeded.',
extra=self.sw_id)
return
# Send ARP request to get node MAC address.
in_port = self.ofctl.get_packetin_inport(msg)
src_ip = None
dst_ip = header_list[IPV4].dst
srcip = ip_addr_ntoa(header_list[IPV4].src)
dstip = ip_addr_ntoa(dst_ip)
address = self.address_data.get_data(ip=dst_ip)
if address is not None:
log_msg = 'Receive IP packet from [%s] to an internal host [%s].'
self.logger.info(log_msg, srcip, dstip, extra=self.sw_id)
src_ip = address.default_gw
else:
route = self.routing_tbl.get_data(dst_ip=dst_ip)
if route is not None:
log_msg = 'Receive IP packet from [%s] to [%s].'
self.logger.info(log_msg, srcip, dstip, extra=self.sw_id)
gw_address = self.address_data.get_data(ip=route.gateway_ip)
if gw_address is not None:
src_ip = gw_address.default_gw
dst_ip = route.gateway_ip
if src_ip is not None:
self.packet_buffer.add(in_port, header_list, msg.data)
self.send_arp_request(src_ip, dst_ip, in_port=in_port)
self.logger.info('Send ARP request (flood)', extra=self.sw_id)
def _packetin_invalid_ttl(self, msg, header_list):
# Send ICMP TTL error.
srcip = ip_addr_ntoa(header_list[IPV4].src)
self.logger.info('Receive invalid ttl packet from [%s].', srcip,
extra=self.sw_id)
in_port = self.ofctl.get_packetin_inport(msg)
src_ip = self._get_send_port_ip(header_list)
if src_ip is not None:
self.ofctl.send_icmp(in_port, header_list, self.vlan_id,
icmp.ICMP_TIME_EXCEEDED,
icmp.ICMP_TTL_EXPIRED_CODE,
msg_data=msg.data, src_ip=src_ip)
self.logger.info('Send ICMP time exceeded to [%s].', srcip,
extra=self.sw_id)
def send_arp_all_gw(self):
gateways = self.routing_tbl.get_gateways()
for gateway in gateways:
address = self.address_data.get_data(ip=gateway)
self.send_arp_request(address.default_gw, gateway)
def send_arp_request(self, src_ip, dst_ip, in_port=None):
# Send ARP request from all ports.
for send_port in self.port_data.values():
if in_port is None or in_port != send_port.port_no:
src_mac = send_port.mac
dst_mac = mac_lib.BROADCAST_STR
arp_target_mac = mac_lib.DONTCARE_STR
inport = self.ofctl.dp.ofproto.OFPP_CONTROLLER
output = send_port.port_no
self.ofctl.send_arp(arp.ARP_REQUEST, self.vlan_id,
src_mac, dst_mac, src_ip, dst_ip,
arp_target_mac, inport, output)
def send_icmp_unreach_error(self, packet_buffer):
# Send ICMP host unreach error.
self.logger.info('ARP reply wait timer was timed out.',
extra=self.sw_id)
src_ip = self._get_send_port_ip(packet_buffer.header_list)
if src_ip is not None:
self.ofctl.send_icmp(packet_buffer.in_port,
packet_buffer.header_list,
self.vlan_id,
icmp.ICMP_DEST_UNREACH,
icmp.ICMP_HOST_UNREACH_CODE,
msg_data=packet_buffer.data,
src_ip=src_ip)
dstip = ip_addr_ntoa(packet_buffer.dst_ip)
self.logger.info('Send ICMP destination unreachable to [%s].',
dstip, extra=self.sw_id)
def _update_routing_tbl(self, msg, header_list):
# Set flow: routing to gateway.
out_port = self.ofctl.get_packetin_inport(msg)
src_mac = header_list[ARP].src_mac
dst_mac = self.port_data[out_port].mac
src_ip = header_list[ARP].src_ip
gateway_flg = False
for key, value in self.routing_tbl.items():
if value.gateway_ip == src_ip:
gateway_flg = True
if value.gateway_mac == src_mac:
continue
self.routing_tbl[key].gateway_mac = src_mac
cookie = self._id_to_cookie(REST_ROUTEID, value.route_id)
priority, log_msg = self._get_priority(PRIORITY_TYPE_ROUTE,
route=value)
self.ofctl.set_routing_flow(cookie, priority, out_port,
dl_vlan=self.vlan_id,
src_mac=dst_mac,
dst_mac=src_mac,
nw_dst=value.dst_ip,
dst_mask=value.netmask,
dec_ttl=True)
self.logger.info('Set %s flow [cookie=0x%x]', log_msg, cookie,
extra=self.sw_id)
return gateway_flg
def _learning_host_mac(self, msg, header_list):
# Set flow: routing to internal Host.
out_port = self.ofctl.get_packetin_inport(msg)
src_mac = header_list[ARP].src_mac
dst_mac = self.port_data[out_port].mac
src_ip = header_list[ARP].src_ip
gateways = self.routing_tbl.get_gateways()
if src_ip not in gateways:
address = self.address_data.get_data(ip=src_ip)
if address is not None:
cookie = self._id_to_cookie(REST_ADDRESSID, address.address_id)
priority = self._get_priority(PRIORITY_IMPLICIT_ROUTING)
self.ofctl.set_routing_flow(cookie, priority,
out_port, dl_vlan=self.vlan_id,
src_mac=dst_mac, dst_mac=src_mac,
nw_dst=src_ip,
idle_timeout=IDLE_TIMEOUT,
dec_ttl=True)
self.logger.info('Set implicit routing flow [cookie=0x%x]',
cookie, extra=self.sw_id)
def _get_send_port_ip(self, header_list):
try:
src_mac = header_list[ETHERNET].src
if IPV4 in header_list:
src_ip = header_list[IPV4].src
else:
src_ip = header_list[ARP].src_ip
except KeyError:
self.logger.debug('Receive unsupported packet.', extra=self.sw_id)
return None
address = self.address_data.get_data(ip=src_ip)
if address is not None:
return address.default_gw
else:
route = self.routing_tbl.get_data(gw_mac=src_mac)
if route is not None:
address = self.address_data.get_data(ip=route.gateway_ip)
if address is not None:
return address.default_gw
self.logger.debug('Receive packet from unknown IP[%s].',
ip_addr_ntoa(src_ip), extra=self.sw_id)
return None
class PortData(dict):
def __init__(self, ports):
super(PortData, self).__init__()
for port in ports.values():
data = Port(port.port_no, port.hw_addr)
self[port.port_no] = data
class Port(object):
def __init__(self, port_no, hw_addr):
super(Port, self).__init__()
self.port_no = port_no
self.mac = hw_addr
class AddressData(dict):
def __init__(self):
super(AddressData, self).__init__()
self.address_id = 1
def add(self, address):
err_msg = 'Invalid [%s] value.' % REST_ADDRESS
nw_addr, mask, default_gw = nw_addr_aton(address, err_msg=err_msg)
# Check overlaps
for other in self.values():
other_mask = mask_ntob(other.netmask)
add_mask = mask_ntob(mask, err_msg=err_msg)
if (other.nw_addr == ipv4_apply_mask(default_gw, other.netmask) or
nw_addr == ipv4_apply_mask(other.default_gw, mask,
err_msg)):
msg = 'Address overlaps [address_id=%d]' % other.address_id
raise CommandFailure(msg=msg)
address = Address(self.address_id, nw_addr, mask, default_gw)
ip_str = ip_addr_ntoa(nw_addr)
key = '%s/%d' % (ip_str, mask)
self[key] = address
self.address_id += 1
self.address_id &= UINT32_MAX
if self.address_id == COOKIE_DEFAULT_ID:
self.address_id = 1
return address
def delete(self, address_id):
for key, value in self.items():
if value.address_id == address_id:
del self[key]
return
def get_default_gw(self):
return [address.default_gw for address in self.values()]
def get_data(self, addr_id=None, ip=None):
for address in self.values():
if addr_id is not None:
if addr_id == address.address_id:
return address
else:
assert ip is not None
if ipv4_apply_mask(ip, address.netmask) == address.nw_addr:
return address
return None
class Address(object):
def __init__(self, address_id, nw_addr, netmask, default_gw):
super(Address, self).__init__()
self.address_id = address_id
self.nw_addr = nw_addr
self.netmask = netmask
self.default_gw = default_gw
def __contains__(self, ip):
return bool(ipv4_apply_mask(ip, self.netmask) == self.nw_addr)
class RoutingTable(dict):
def __init__(self):
super(RoutingTable, self).__init__()
self.route_id = 1
def add(self, dst_nw_addr, gateway_ip):
err_msg = 'Invalid [%s] value.'
if dst_nw_addr == DEFAULT_ROUTE:
dst_ip = 0
netmask = 0
else:
dst_ip, netmask, dummy = nw_addr_aton(
dst_nw_addr, err_msg=err_msg % REST_DESTINATION)
gateway_ip = ip_addr_aton(gateway_ip, err_msg=err_msg % REST_GATEWAY)
# Check overlaps
overlap_route = None
if dst_nw_addr == DEFAULT_ROUTE:
if DEFAULT_ROUTE in self:
overlap_route = self[DEFAULT_ROUTE].route_id
elif dst_nw_addr in self:
overlap_route = self[dst_nw_addr].route_id
if overlap_route is not None:
msg = 'Destination overlaps [route_id=%d]' % overlap_route
raise CommandFailure(msg=msg)
routing_data = Route(self.route_id, dst_ip, netmask, gateway_ip)
ip_str = ip_addr_ntoa(dst_ip)
key = '%s/%d' % (ip_str, netmask)
self[key] = routing_data
self.route_id += 1
self.route_id &= UINT32_MAX
if self.route_id == COOKIE_DEFAULT_ID:
self.route_id = 1
return routing_data
def delete(self, route_id):
for key, value in self.items():
if value.route_id == route_id:
del self[key]
return
def get_gateways(self):
return [routing_data.gateway_ip for routing_data in self.values()]
def get_data(self, gw_mac=None, dst_ip=None):
if gw_mac is not None:
for route in self.values():
if gw_mac == route.gateway_mac:
return route
return None
elif dst_ip is not None:
get_route = None
mask = 0
for route in self.values():
if ipv4_apply_mask(dst_ip, route.netmask) == route.dst_ip:
# For longest match
if mask < route.netmask:
get_route = route
mask = route.netmask
if get_route is None:
get_route = self.get(DEFAULT_ROUTE, None)
return get_route
else:
return None
class Route(object):
def __init__(self, route_id, dst_ip, netmask, gateway_ip):
super(Route, self).__init__()
self.route_id = route_id
self.dst_ip = dst_ip
self.netmask = netmask
self.gateway_ip = gateway_ip
self.gateway_mac = None
class SuspendPacketList(list):
def __init__(self, timeout_function):
super(SuspendPacketList, self).__init__()
self.timeout_function = timeout_function
def add(self, in_port, header_list, data):
suspend_pkt = SuspendPacket(in_port, header_list, data,
self.wait_arp_reply_timer)
self.append(suspend_pkt)
def delete(self, pkt=None, del_addr=None):
if pkt is not None:
del_list = [pkt]
else:
assert del_addr is not None
del_list = [pkt for pkt in self if pkt.dst_ip in del_addr]
for pkt in del_list:
self.remove(pkt)
hub.kill(pkt.wait_thread)
pkt.wait_thread.wait()
def get_data(self, dst_ip):
return [pkt for pkt in self if pkt.dst_ip == dst_ip]
def wait_arp_reply_timer(self, suspend_pkt):
hub.sleep(ARP_REPLY_TIMER)
if suspend_pkt in self:
self.timeout_function(suspend_pkt)
self.delete(pkt=suspend_pkt)
class SuspendPacket(object):
def __init__(self, in_port, header_list, data, timer):
super(SuspendPacket, self).__init__()
self.in_port = in_port
self.dst_ip = header_list[IPV4].dst
self.header_list = header_list
self.data = data
# Start ARP reply wait timer.
self.wait_thread = hub.spawn(timer, self)
class OfCtl(object):
_OF_VERSIONS = {}
@staticmethod
def register_of_version(version):
def _register_of_version(cls):
OfCtl._OF_VERSIONS.setdefault(version, cls)
return cls
return _register_of_version
@staticmethod
def factory(dp, logger):
of_version = dp.ofproto.OFP_VERSION
if of_version in OfCtl._OF_VERSIONS:
ofctl = OfCtl._OF_VERSIONS[of_version](dp, logger)
else:
raise OFPUnknownVersion(version=of_version)
return ofctl
def __init__(self, dp, logger):
super(OfCtl, self).__init__()
self.dp = dp
self.sw_id = {'sw_id': dpid_lib.dpid_to_str(dp.id)}
self.logger = logger
def set_sw_config_for_ttl(self):
# OpenFlow v1_2 only.
pass
def set_flow(self, cookie, priority, dl_type=0, dl_dst=0, dl_vlan=0,
nw_src=0, src_mask=32, nw_dst=0, dst_mask=32,
nw_proto=0, idle_timeout=0, actions=None):
# Abstract method
raise NotImplementedError()
def send_arp(self, arp_opcode, vlan_id, src_mac, dst_mac,
src_ip, dst_ip, arp_target_mac, in_port, output):
# Generate ARP packet
if vlan_id != VLANID_NONE:
ether_proto = ether.ETH_TYPE_8021Q
pcp = 0
cfi = 0
vlan_ether = ether.ETH_TYPE_ARP
v = vlan.vlan(pcp, cfi, vlan_id, vlan_ether)
else:
ether_proto = ether.ETH_TYPE_ARP
hwtype = 1
arp_proto = ether.ETH_TYPE_IP
hlen = 6
plen = 4
pkt = packet.Packet()
e = ethernet.ethernet(dst_mac, src_mac, ether_proto)
a = arp.arp(hwtype, arp_proto, hlen, plen, arp_opcode,
src_mac, src_ip, arp_target_mac, dst_ip)
pkt.add_protocol(e)
if vlan_id != VLANID_NONE:
pkt.add_protocol(v)
pkt.add_protocol(a)
pkt.serialize()
# Send packet out
self.send_packet_out(in_port, output, pkt.data, data_str=str(pkt))
def send_icmp(self, in_port, protocol_list, vlan_id, icmp_type,
icmp_code, icmp_data=None, msg_data=None, src_ip=None):
# Generate ICMP reply packet
csum = 0
offset = ethernet.ethernet._MIN_LEN
if vlan_id != VLANID_NONE:
ether_proto = ether.ETH_TYPE_8021Q
pcp = 0
cfi = 0
vlan_ether = ether.ETH_TYPE_IP
v = vlan.vlan(pcp, cfi, vlan_id, vlan_ether)
offset += vlan.vlan._MIN_LEN
else:
ether_proto = ether.ETH_TYPE_IP
eth = protocol_list[ETHERNET]
e = ethernet.ethernet(eth.src, eth.dst, ether_proto)
if icmp_data is None and msg_data is not None:
ip_datagram = msg_data[offset:]
if icmp_type == icmp.ICMP_DEST_UNREACH:
icmp_data = icmp.dest_unreach(data_len=len(ip_datagram),
data=ip_datagram)
elif icmp_type == icmp.ICMP_TIME_EXCEEDED:
icmp_data = icmp.TimeExceeded(data_len=len(ip_datagram),
data=ip_datagram)
ic = icmp.icmp(icmp_type, icmp_code, csum, data=icmp_data)
ip = protocol_list[IPV4]
if src_ip is None:
src_ip = ip.dst
ip_total_length = ip.header_length * 4 + ic._MIN_LEN
if ic.data is not None:
ip_total_length += ic.data._MIN_LEN
if ic.data.data is not None:
ip_total_length += + len(ic.data.data)
i = ipv4.ipv4(ip.version, ip.header_length, ip.tos,
ip_total_length, ip.identification, ip.flags,
ip.offset, DEFAULT_TTL, inet.IPPROTO_ICMP, csum,
src_ip, ip.src)
pkt = packet.Packet()
pkt.add_protocol(e)
if vlan_id != VLANID_NONE:
pkt.add_protocol(v)
pkt.add_protocol(i)
pkt.add_protocol(ic)
pkt.serialize()
# Send packet out
self.send_packet_out(in_port, self.dp.ofproto.OFPP_IN_PORT,
pkt.data, data_str=str(pkt))
def send_packet_out(self, in_port, output, data, data_str=None):
actions = [self.dp.ofproto_parser.OFPActionOutput(output, 0)]
self.dp.send_packet_out(buffer_id=UINT32_MAX, in_port=in_port,
actions=actions, data=data)
#TODO: Packet library convert to string
#if data_str is None:
# data_str = str(packet.Packet(data))
#self.logger.debug('Packet out = %s', data_str, extra=self.sw_id)
def set_normal_flow(self, cookie, priority):
out_port = self.dp.ofproto.OFPP_NORMAL
actions = [self.dp.ofproto_parser.OFPActionOutput(out_port, 0)]
self.set_flow(cookie, priority, actions=actions)
def set_packetin_flow(self, cookie, priority, dl_type=0, dl_dst=0,
dl_vlan=0, dst_ip=0, dst_mask=32, nw_proto=0):
miss_send_len = UINT16_MAX
actions = [self.dp.ofproto_parser.OFPActionOutput(
self.dp.ofproto.OFPP_CONTROLLER, miss_send_len)]
self.set_flow(cookie, priority, dl_type=dl_type, dl_dst=dl_dst,
dl_vlan=dl_vlan, nw_dst=dst_ip, dst_mask=dst_mask,
nw_proto=nw_proto, actions=actions)
def send_stats_request(self, stats, waiters):
self.dp.set_xid(stats)
waiters_per_dp = waiters.setdefault(self.dp.id, {})
event = hub.Event()
msgs = []
waiters_per_dp[stats.xid] = (event, msgs)
self.dp.send_msg(stats)
try:
event.wait(timeout=OFP_REPLY_TIMER)
except hub.Timeout:
del waiters_per_dp[stats.xid]
return msgs
@OfCtl.register_of_version(ofproto_v1_0.OFP_VERSION)
class OfCtl_v1_0(OfCtl):
def __init__(self, dp, logger):
super(OfCtl_v1_0, self).__init__(dp, logger)
def get_packetin_inport(self, msg):
return msg.in_port
def get_all_flow(self, waiters):
ofp = self.dp.ofproto
ofp_parser = self.dp.ofproto_parser
match = ofp_parser.OFPMatch(ofp.OFPFW_ALL, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0)
stats = ofp_parser.OFPFlowStatsRequest(self.dp, 0, match,
0xff, ofp.OFPP_NONE)
return self.send_stats_request(stats, waiters)
def set_flow(self, cookie, priority, dl_type=0, dl_dst=0, dl_vlan=0,
nw_src=0, src_mask=32, nw_dst=0, dst_mask=32,
nw_proto=0, idle_timeout=0, actions=None):
ofp = self.dp.ofproto
ofp_parser = self.dp.ofproto_parser
cmd = ofp.OFPFC_ADD
# Match
wildcards = ofp.OFPFW_ALL
if dl_type:
wildcards &= ~ofp.OFPFW_DL_TYPE
if dl_dst:
wildcards &= ~ofp.OFPFW_DL_DST
if dl_vlan:
wildcards &= ~ofp.OFPFW_DL_VLAN
if nw_src:
v = (32 - src_mask) << ofp.OFPFW_NW_SRC_SHIFT | \
~ofp.OFPFW_NW_SRC_MASK
wildcards &= v
nw_src = ipv4_text_to_int(nw_src),
if nw_dst:
v = (32 - dst_mask) << ofp.OFPFW_NW_DST_SHIFT | \
~ofp.OFPFW_NW_DST_MASK
wildcards &= v
nw_dst = ipv4_text_to_int(nw_dst),
if nw_proto:
wildcards &= ~ofp.OFPFW_NW_PROTO
match = ofp_parser.OFPMatch(wildcards, 0, 0, dl_dst, dl_vlan, 0,
dl_type, 0, nw_proto,
nw_src, nw_dst, 0, 0)
actions = actions or []
m = ofp_parser.OFPFlowMod(self.dp, match, cookie, cmd,
idle_timeout=idle_timeout,
priority=priority, actions=actions)
self.dp.send_msg(m)
def set_routing_flow(self, cookie, priority, outport, dl_vlan=0,
nw_src=0, src_mask=32, nw_dst=0, dst_mask=32,
src_mac=0, dst_mac=0, idle_timeout=0, **dummy):
ofp_parser = self.dp.ofproto_parser
dl_type = ether.ETH_TYPE_IP
# Decrement TTL value is not supported at OpenFlow V1.0
actions = []
if src_mac:
actions.append(ofp_parser.OFPActionSetDlSrc(
mac_lib.haddr_to_bin(src_mac)))
if dst_mac:
actions.append(ofp_parser.OFPActionSetDlDst(
mac_lib.haddr_to_bin(dst_mac)))
if outport is not None:
actions.append(ofp_parser.OFPActionOutput(outport))
self.set_flow(cookie, priority, dl_type=dl_type, dl_vlan=dl_vlan,
nw_src=nw_src, src_mask=src_mask,
nw_dst=nw_dst, dst_mask=dst_mask,
idle_timeout=idle_timeout, actions=actions)
def delete_flow(self, flow_stats):
match = flow_stats.match
cookie = flow_stats.cookie
cmd = self.dp.ofproto.OFPFC_DELETE_STRICT
priority = flow_stats.priority
actions = []
flow_mod = self.dp.ofproto_parser.OFPFlowMod(
self.dp, match, cookie, cmd, priority=priority, actions=actions)
self.dp.send_msg(flow_mod)
self.logger.info('Delete flow [cookie=0x%x]', cookie, extra=self.sw_id)
@OfCtl.register_of_version(ofproto_v1_2.OFP_VERSION)
class OfCtl_v1_2(OfCtl):
def __init__(self, dp, logger):
super(OfCtl_v1_2, self).__init__(dp, logger)
def set_sw_config_for_ttl(self):
flags = self.dp.ofproto.OFPC_INVALID_TTL_TO_CONTROLLER
miss_send_len = UINT16_MAX
m = self.dp.ofproto_parser.OFPSetConfig(self.dp, flags,
miss_send_len)
self.dp.send_msg(m)
self.logger.info('Set SW config for TTL error packet in.',
extra=self.sw_id)
def get_packetin_inport(self, msg):
in_port = self.dp.ofproto.OFPP_ANY
for match_field in msg.match.fields:
if match_field.header == self.dp.ofproto.OXM_OF_IN_PORT:
in_port = match_field.value
break
return in_port
def get_all_flow(self, waiters):
ofp = self.dp.ofproto
ofp_parser = self.dp.ofproto_parser
match = ofp_parser.OFPMatch()
stats = ofp_parser.OFPFlowStatsRequest(self.dp, 0, ofp.OFPP_ANY,
ofp.OFPG_ANY, 0, 0, match)
return self.send_stats_request(stats, waiters)
def set_flow(self, cookie, priority, dl_type=0, dl_dst=0, dl_vlan=0,
nw_src=0, src_mask=32, nw_dst=0, dst_mask=32,
nw_proto=0, idle_timeout=0, actions=None):
ofp = self.dp.ofproto
ofp_parser = self.dp.ofproto_parser
cmd = ofp.OFPFC_ADD
# Match
match = ofp_parser.OFPMatch()
if dl_type:
match.set_dl_type(dl_type)
if dl_dst:
match.set_dl_dst(dl_dst)
if dl_vlan:
match.set_vlan_vid(dl_vlan)
if nw_src:
match.set_ipv4_src_masked(ipv4_text_to_int(nw_src),
mask_ntob(src_mask))
if nw_dst:
match.set_ipv4_dst_masked(ipv4_text_to_int(nw_dst),
mask_ntob(dst_mask))
if nw_proto:
if dl_type == ether.ETH_TYPE_IP:
match.set_ip_proto(nw_proto)
elif dl_type == ether.ETH_TYPE_ARP:
match.set_arp_opcode(nw_proto)
# Instructions
actions = actions or []
inst = [ofp_parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS,
actions)]
m = ofp_parser.OFPFlowMod(self.dp, cookie, 0, 0, cmd, idle_timeout,
0, priority, UINT32_MAX, ofp.OFPP_ANY,
ofp.OFPG_ANY, 0, match, inst)
self.dp.send_msg(m)
def set_routing_flow(self, cookie, priority, outport, dl_vlan=0,
nw_src=0, src_mask=32, nw_dst=0, dst_mask=32,
src_mac=0, dst_mac=0, idle_timeout=0, dec_ttl=False):
ofp = self.dp.ofproto
ofp_parser = self.dp.ofproto_parser
dl_type = ether.ETH_TYPE_IP
actions = []
if dec_ttl:
actions.append(ofp_parser.OFPActionDecNwTtl())
if src_mac:
set_src = ofp_parser.OFPMatchField.make(ofp.OXM_OF_ETH_SRC,
src_mac)
actions.append(ofp_parser.OFPActionSetField(set_src))
if dst_mac:
set_dst = ofp_parser.OFPMatchField.make(ofp.OXM_OF_ETH_DST,
dst_mac)
actions.append(ofp_parser.OFPActionSetField(set_dst))
if outport is not None:
actions.append(ofp_parser.OFPActionOutput(outport, 0))
self.set_flow(cookie, priority, dl_type=dl_type, dl_vlan=dl_vlan,
nw_src=nw_src, src_mask=src_mask,
nw_dst=nw_dst, dst_mask=dst_mask,
idle_timeout=idle_timeout, actions=actions)
def delete_flow(self, flow_stats):
ofp = self.dp.ofproto
ofp_parser = self.dp.ofproto_parser
cmd = ofp.OFPFC_DELETE
cookie = flow_stats.cookie
cookie_mask = UINT64_MAX
match = ofp_parser.OFPMatch()
inst = []
flow_mod = ofp_parser.OFPFlowMod(self.dp, cookie, cookie_mask, 0, cmd,
0, 0, 0, UINT32_MAX, ofp.OFPP_ANY,
ofp.OFPG_ANY, 0, match, inst)
self.dp.send_msg(flow_mod)
self.logger.info('Delete flow [cookie=0x%x]', cookie, extra=self.sw_id)
def ip_addr_aton(ip_str, err_msg=None):
try:
return addrconv.ipv4.bin_to_text(socket.inet_aton(ip_str))
except (struct.error, socket.error) as e:
if err_msg is not None:
e.message = '%s %s' % (err_msg, e.message)
raise ValueError(e.message)
def ip_addr_ntoa(ip):
return socket.inet_ntoa(addrconv.ipv4.text_to_bin(ip))
def mask_ntob(mask, err_msg=None):
try:
return (UINT32_MAX << (32 - mask)) & UINT32_MAX
except ValueError:
msg = 'illegal netmask'
if err_msg is not None:
msg = '%s %s' % (err_msg, msg)
raise ValueError(msg)
def ipv4_apply_mask(address, prefix_len, err_msg=None):
import itertools
assert isinstance(address, str)
address_int = ipv4_text_to_int(address)
return ipv4_int_to_text(address_int & mask_ntob(prefix_len, err_msg))
def ipv4_int_to_text(ip_int):
assert isinstance(ip_int, (int, long))
return addrconv.ipv4.bin_to_text(struct.pack('!I', ip_int))
def ipv4_text_to_int(ip_text):
if ip_text == 0:
return ip_text
assert isinstance(ip_text, str)
return struct.unpack('!I', addrconv.ipv4.text_to_bin(ip_text))[0]
def nw_addr_aton(nw_addr, err_msg=None):
ip_mask = nw_addr.split('/')
default_route = ip_addr_aton(ip_mask[0], err_msg=err_msg)
netmask = 32
if len(ip_mask) == 2:
try:
netmask = int(ip_mask[1])
except ValueError as e:
if err_msg is not None:
e.message = '%s %s' % (err_msg, e.message)
raise ValueError(e.message)
if netmask < 0:
msg = 'illegal netmask'
if err_msg is not None:
msg = '%s %s' % (err_msg, msg)
raise ValueError(msg)
nw_addr = ipv4_apply_mask(default_route, netmask, err_msg)
return nw_addr, netmask, default_route
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