onos.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 ##
   5 # Copyright 2016, I2T Research Group (UPV/EHU)
   6 # This file is part of openvim
   7 # All Rights Reserved.
   8 #
   9 # Licensed under the Apache License, Version 2.0 (the "License"); you may
  10 # not use this file except in compliance with the License. You may obtain
  11 # a copy of the License at
  12 #
  13 #         http://www.apache.org/licenses/LICENSE-2.0
  14 #
  15 # Unless required by applicable law or agreed to in writing, software
  16 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  17 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  18 # License for the specific language governing permissions and limitations
  19 # under the License.
  20 #
  21 # For those usages not covered by the Apache License, Version 2.0 please
  22 # contact with: alaitz.mendiola@ehu.eus or alaitz.mendiola@gmail.com
  23 ##
  24
  25 '''
  26 ImplementS the pluging for the Open Network Operating System (ONOS) openflow
  27 controller. It creates the class OF_conn to create dataplane connections
  28 with static rules based on packet destination MAC address
  29 '''
  30
  31 __author__="Alaitz Mendiola"
  32 __date__ ="$22-nov-2016$"
  33
  34
  35 import json
  36 import requests
  37 import base64
  38 import logging
  39
  40 class OF_conn():
  41     '''ONOS connector. No MAC learning is used'''
  42     def __init__(self, params):
  43         ''' Constructor.
  44             Params: dictionary with the following keys:
  45                 of_dpid:     DPID to use for this controller ?? Does a controller have a dpid?
  46                 of_ip:       controller IP address
  47                 of_port:     controller TCP port
  48                 of_user:     user credentials, can be missing or None
  49                 of_password: password credentials
  50                 of_debug:    debug level for logging. Default to ERROR
  51                 other keys are ignored
  52             Raise an exception if same parameter is missing or wrong
  53         '''
  54         #check params
  55
  56         if "of_ip" not in params or params["of_ip"]==None or "of_port" not in params or params["of_port"]==None:
  57             raise ValueError("IP address and port must be provided")
  58         #internal variables
  59         self.name = "onos"
  60         self.headers = {'content-type':'application/json',
  61                         'accept':'application/json',
  62         }
  63
  64         self.auth="None"
  65         self.pp2ofi={}  # From Physical Port to OpenFlow Index
  66         self.ofi2pp={}  # From OpenFlow Index to Physical Port
  67
  68         self.dpid = str(params["of_dpid"])
  69         self.id = 'of:'+str(self.dpid.replace(':', ''))
  70         self.url = "http://%s:%s/onos/v1/" %( str(params["of_ip"]), str(params["of_port"] ) )
  71
  72         # TODO This may not be straightforward
  73         if "of_user" in params and params["of_user"]!=None:
  74             if not params.get("of_password"):
  75                 of_password=""
  76             else:
  77                 of_password=str(params["of_password"])
  78             self.auth = base64.b64encode(str(params["of_user"])+":"+of_password)
  79             self.headers['authorization'] = 'Basic ' + self.auth
  80
  81
  82         self.logger = logging.getLogger('vim.OF.onos')
  83         self.logger.setLevel( getattr(logging, params.get("of_debug", "ERROR")) )
  84
  85     def get_of_switches(self):
  86         ''' Obtain a a list of switches or DPID detected by this controller
  87             Return
  88                 >=0, list:      list length, and a list where each element a tuple pair (DPID, IP address)
  89                 <0, text_error: if fails
  90         '''
  91         try:
  92             self.headers['content-type'] = 'text/plain'
  93             of_response = requests.get(self.url + "devices", headers=self.headers)
  94             error_text = "Openflow response %d: %s" % (of_response.status_code, of_response.text)
  95             if of_response.status_code != 200:
  96                 self.logger.warning("get_of_switches " + error_text)
  97                 return -1, error_text
  98
  99             self.logger.debug("get_of_switches " + error_text)
 100             info = of_response.json()
 101
 102             if type(info) != dict:
 103                 self.logger.error("get_of_switches. Unexpected response, not a dict: %s", str(info))
 104                 return -1, "Unexpected response, not a dict. Wrong version?"
 105
 106             node_list = info.get('devices')
 107
 108             if type(node_list) is not list:
 109                 self.logger.error(
 110                     "get_of_switches. Unexpected response, at 'devices', not found or not a list: %s",
 111                     str(type(node_list)))
 112                 return -1, "Unexpected response, at 'devices', not found or not a list. Wrong version?"
 113
 114             switch_list = []
 115             for node in node_list:
 116                 node_id = node.get('id')
 117                 if node_id is None:
 118                     self.logger.error("get_of_switches. Unexpected response at 'device':'id', not found: %s",
 119                                       str(node))
 120                     return -1, "Unexpected response at 'device':'id', not found . Wrong version?"
 121
 122                 node_ip_address = node.get('annotations').get('managementAddress')
 123                 if node_ip_address is None:
 124                     self.logger.error(
 125                         "get_of_switches. Unexpected response at 'device':'managementAddress', not found: %s",
 126                         str(node))
 127                     return -1, "Unexpected response at 'device':'managementAddress', not found. Wrong version?"
 128
 129                 node_id_hex = hex(int(node_id.split(':')[1])).split('x')[1].zfill(16)
 130
 131                 switch_list.append(
 132                     (':'.join(a + b for a, b in zip(node_id_hex[::2], node_id_hex[1::2])), node_ip_address))
 133
 134             return len(switch_list), switch_list
 135
 136         except (requests.exceptions.RequestException, ValueError) as e:
 137             # ValueError in the case that JSON can not be decoded
 138             error_text = type(e).__name__ + ": " + str(e)
 139             self.logger.error("get_of_switches " + error_text)
 140             return -1, error_text
 141
 142
 143
 144     def obtain_port_correspondence(self):
 145         '''Obtain the correspondence between physical and openflow port names
 146         return:
 147              0, dictionary: with physical name as key, openflow name as value
 148             -1, error_text: if fails
 149         '''
 150         try:
 151             self.headers['content-type'] = 'text/plain'
 152             of_response = requests.get(self.url + "devices/" + self.id + "/ports", headers=self.headers)
 153             error_text = "Openflow response %d: %s" % (of_response.status_code, of_response.text)
 154             if of_response.status_code != 200:
 155                 self.logger.warning("obtain_port_correspondence " + error_text)
 156                 return -1, error_text
 157
 158             self.logger.debug("obtain_port_correspondence " + error_text)
 159             info = of_response.json()
 160
 161             node_connector_list = info.get('ports')
 162             if type(node_connector_list) is not list:
 163                 self.logger.error(
 164                     "obtain_port_correspondence. Unexpected response at 'ports', not found or not a list: %s",
 165                     str(node_connector_list))
 166                 return -1, "Unexpected response at 'ports', not found  or not a list. Wrong version?"
 167
 168             for node_connector in node_connector_list:
 169                 if (node_connector['port'] != "local"):
 170                     self.pp2ofi[str(node_connector['annotations']['portName'])] = str(node_connector['port'])
 171                     self.ofi2pp[str(node_connector['port'])] = str(node_connector['annotations']['portName'])
 172
 173             node_ip_address = info['annotations']['managementAddress']
 174             if node_ip_address is None:
 175                 self.logger.error(
 176                     "obtain_port_correspondence. Unexpected response at 'managementAddress', not found: %s",
 177                     str(self.id))
 178                 return -1, "Unexpected response at 'managementAddress', not found. Wrong version?"
 179             self.ip_address = node_ip_address
 180
 181             # print self.name, ": obtain_port_correspondence ports:", self.pp2ofi
 182             return 0, self.pp2ofi
 183
 184         except (requests.exceptions.RequestException, ValueError) as e:
 185             # ValueError in the case that JSON can not be decoded
 186             error_text = type(e).__name__ + ": " + str(e)
 187             self.logger.error("obtain_port_correspondence " + error_text)
 188             return -1, error_text
 189
 190     def get_of_rules(self, translate_of_ports=True):
 191         ''' Obtain the rules inserted at openflow controller
 192             Params:
 193                 translate_of_ports: if True it translates ports from openflow index to physical switch name
 194             Return:
 195                 0, dict if ok: with the rule name as key and value is another dictionary with the following content:
 196                     priority: rule priority
 197                     name:         rule name (present also as the master dict key)
 198                     ingress_port: match input port of the rule
 199                     dst_mac:      match destination mac address of the rule, can be missing or None if not apply
 200                     vlan_id:      match vlan tag of the rule, can be missing or None if not apply
 201                     actions:      list of actions, composed by a pair tuples:
 202                         (vlan, None/int): for stripping/setting a vlan tag
 203                         (out, port):      send to this port
 204                     switch:       DPID, all
 205                 -1, text_error if fails
 206         '''
 207
 208
 209         if len(self.ofi2pp) == 0:
 210             r, c = self.obtain_port_correspondence()
 211             if r < 0:
 212                 return r, c
 213         # get rules
 214         try:
 215             of_response = requests.get(self.url + "flows/" + self.id, headers=self.headers)
 216             error_text = "Openflow response %d: %s" % (of_response.status_code, of_response.text)
 217
 218             # The configured page does not exist if there are no rules installed. In that case we return an empty dict
 219             if of_response.status_code == 404:
 220                 return 0, {}
 221
 222             elif of_response.status_code != 200:
 223                 self.logger.warning("get_of_rules " + error_text)
 224                 return -1, error_text
 225             self.logger.debug("get_of_rules " + error_text)
 226
 227             info = of_response.json()
 228
 229             if type(info) != dict:
 230                 self.logger.error("get_of_rules. Unexpected response, not a dict: %s", str(info))
 231                 return -1, "Unexpected openflow response, not a dict. Wrong version?"
 232
 233             flow_list = info.get('flows')
 234
 235             if flow_list is None:
 236                 return 0, {}
 237
 238             if type(flow_list) is not list:
 239                 self.logger.error(
 240                     "get_of_rules. Unexpected response at 'flows', not a list: %s",
 241                     str(type(flow_list)))
 242                 return -1, "Unexpected response at 'flows', not a list. Wrong version?"
 243
 244             rules = dict() # Response dictionary
 245
 246             for flow in flow_list:
 247                 if not ('id' in flow and 'selector' in flow and 'treatment' in flow and \
 248                                     'instructions' in flow['treatment'] and 'criteria' in \
 249                                     flow['selector']):
 250                     return -1, "unexpected openflow response, one or more elements are missing. Wrong version?"
 251
 252                 rule = dict()
 253                 rule['switch'] = self.dpid
 254                 rule['priority'] = flow.get('priority')
 255                 rule['name'] = flow['id']
 256
 257                 for criteria in flow['selector']['criteria']:
 258                     if criteria['type'] == 'IN_PORT':
 259                         in_port = str(criteria['port'])
 260                         if in_port != "CONTROLLER":
 261                             if not in_port in self.ofi2pp:
 262                                 return -1, "Error: Ingress port " + in_port + " is not in switch port list"
 263                             if translate_of_ports:
 264                                 in_port = self.ofi2pp[in_port]
 265                         rule['ingress_port'] = in_port
 266
 267                     elif criteria['type'] == 'VLAN_VID':
 268                         rule['vlan_id'] = criteria['vlanId']
 269
 270                     elif criteria['type'] == 'ETH_DST':
 271                         rule['dst_mac'] = str(criteria['mac']).lower()
 272
 273                 actions = []
 274                 for instruction in flow['treatment']['instructions']:
 275                     if instruction['type'] == "OUTPUT":
 276                         out_port = str(instruction['port'])
 277                         if out_port != "CONTROLLER":
 278                             if not out_port in self.ofi2pp:
 279                                 return -1, "Error: Output port " + out_port + " is not in switch port list"
 280
 281                             if translate_of_ports:
 282                                 out_port = self.ofi2pp[out_port]
 283
 284                         actions.append( ('out', out_port) )
 285
 286                     if instruction['type'] == "L2MODIFICATION" and instruction['subtype'] == "VLAN_POP":
 287                         actions.append( ('vlan', 'None') )
 288                     if instruction['type'] == "L2MODIFICATION" and instruction['subtype'] == "VLAN_ID":
 289                         actions.append( ('vlan', instruction['vlanId']) )
 290
 291                 rule['actions'] = actions
 292                 rules[flow['id']] = dict(rule)
 293
 294             return 0, rules
 295
 296         except (requests.exceptions.RequestException, ValueError) as e:
 297             # ValueError in the case that JSON can not be decoded
 298             error_text = type(e).__name__ + ": " + str(e)
 299             self.logger.error("get_of_rules " + error_text)
 300             return -1, error_text
 301
 302     def del_flow(self, flow_name):
 303         ''' Delete an existing rule
 304             Params: flow_name, this is the rule name
 305             Return
 306                 0, None if ok
 307                 -1, text_error if fails
 308         '''
 309
 310         try:
 311             self.headers['content-type'] = None
 312             of_response = requests.delete(self.url + "flows/" + self.id + "/" + flow_name, headers=self.headers)
 313             error_text = "Openflow response %d: %s" % (of_response.status_code, of_response.text)
 314
 315             if of_response.status_code != 204:
 316                 self.logger.warning("del_flow " + error_text)
 317                 return -1 , error_text
 318             self.logger.debug("del_flow OK " + error_text)
 319             return 0, None
 320
 321         except requests.exceptions.RequestException as e:
 322             error_text = type(e).__name__ + ": " + str(e)
 323             self.logger.error("del_flow " + error_text)
 324             return -1, error_text
 325
 326     def new_flow(self, data):
 327         ''' Insert a new static rule
 328             Params: data: dictionary with the following content:
 329                 priority:     rule priority
 330                 name:         rule name
 331                 ingress_port: match input port of the rule
 332                 dst_mac:      match destination mac address of the rule, missing or None if not apply
 333                 vlan_id:      match vlan tag of the rule, missing or None if not apply
 334                 actions:      list of actions, composed by a pair tuples with these posibilities:
 335                     ('vlan', None/int): for stripping/setting a vlan tag
 336                     ('out', port):      send to this port
 337             Return
 338                 0, None if ok
 339                 -1, text_error if fails
 340         '''
 341
 342         if len(self.pp2ofi) == 0:
 343             r,c = self.obtain_port_correspondence()
 344             if r<0:
 345                 return r,c
 346         try:
 347             # Build the dictionary with the flow rule information for ONOS
 348             flow = dict()
 349             #flow['id'] = data['name']
 350             flow['tableId'] = 0
 351             flow['priority'] = data.get('priority')
 352             flow['timeout'] = 0
 353             flow['isPermanent'] = "true"
 354             flow['appId'] = 10 # FIXME We should create an appId for OSM
 355             flow['selector'] = dict()
 356             flow['selector']['criteria'] = list()
 357
 358             # Flow rule matching criteria
 359             if not data['ingress_port'] in self.pp2ofi:
 360                 error_text = 'Error. Port ' + data['ingress_port'] + ' is not present in the switch'
 361                 self.logger.warning("new_flow " + error_text)
 362                 return -1, error_text
 363
 364             ingress_port_criteria = dict()
 365             ingress_port_criteria['type'] = "IN_PORT"
 366             ingress_port_criteria['port'] = self.pp2ofi[data['ingress_port']]
 367             flow['selector']['criteria'].append(ingress_port_criteria)
 368
 369             if 'dst_mac' in data:
 370                 dst_mac_criteria = dict()
 371                 dst_mac_criteria["type"] = "ETH_DST"
 372                 dst_mac_criteria["mac"] = data['dst_mac']
 373                 flow['selector']['criteria'].append(dst_mac_criteria)
 374
 375             if data.get('vlan_id'):
 376                 vlan_criteria = dict()
 377                 vlan_criteria["type"] = "VLAN_VID"
 378                 vlan_criteria["vlanId"] = int(data['vlan_id'])
 379                 flow['selector']['criteria'].append(vlan_criteria)
 380
 381             # Flow rule treatment
 382             flow['treatment'] = dict()
 383             flow['treatment']['instructions'] = list()
 384             flow['treatment']['deferred'] = list()
 385
 386             for action in data['actions']:
 387                 new_action = dict()
 388                 if  action[0] == "vlan":
 389                     new_action['type'] = "L2MODIFICATION"
 390                     if action[1] == None:
 391                         new_action['subtype'] = "VLAN_POP"
 392                     else:
 393                         new_action['subtype'] = "VLAN_ID"
 394                         new_action['vlanId'] = int(action[1])
 395                 elif action[0] == 'out':
 396                     new_action['type'] = "OUTPUT"
 397                     if not action[1] in self.pp2ofi:
 398                         error_msj = 'Port '+ action[1] + ' is not present in the switch'
 399                         return -1, error_msj
 400                     new_action['port'] = self.pp2ofi[action[1]]
 401                 else:
 402                     error_msj = "Unknown item '%s' in action list" % action[0]
 403                     self.logger.error("new_flow " + error_msj)
 404                     return -1, error_msj
 405
 406                 flow['treatment']['instructions'].append(new_action)
 407
 408             self.headers['content-type'] = 'application/json'
 409             path = self.url + "flows/" + self.id
 410             of_response = requests.post(path, headers=self.headers, data=json.dumps(flow) )
 411
 412             error_text = "Openflow response %d: %s" % (of_response.status_code, of_response.text)
 413             if of_response.status_code != 201:
 414                 self.logger.warning("new_flow " + error_text)
 415                 return -1 , error_text
 416
 417
 418             flowId = of_response.headers['location'][path.__len__() + 1:]
 419
 420             data['name'] = flowId
 421
 422             self.logger.debug("new_flow OK " + error_text)
 423             return 0, None
 424
 425         except requests.exceptions.RequestException as e:
 426             error_text = type(e).__name__ + ": " + str(e)
 427             self.logger.error("new_flow " + error_text)
 428             return -1, error_text
 429
 430     def clear_all_flows(self):
 431         ''' Delete all existing rules
 432             Return:
 433                 0, None if ok
 434                 -1, text_error if fails
 435         '''
 436         try:
 437             c, rules = self.get_of_rules(True)
 438             if c < 0:
 439                 return -1, "Error retrieving the flows"
 440
 441             for rule in rules:
 442                 self.del_flow(rule)
 443
 444             self.logger.debug("clear_all_flows OK ")
 445             return 0, None
 446
 447         except requests.exceptions.RequestException as e:
 448             error_text = type(e).__name__ + ": " + str(e)
 449             self.logger.error("clear_all_flows " + error_text)
 450             return -1, error_text
 451
 452