|
1
|
|
|
"""kytos/flow_manager NApp installs, lists and deletes switch flows.""" |
|
2
|
1 |
|
from collections import OrderedDict |
|
3
|
|
|
|
|
4
|
1 |
|
from flask import jsonify, request |
|
5
|
|
|
|
|
6
|
1 |
|
from kytos.core import KytosEvent, KytosNApp, log, rest |
|
7
|
1 |
|
from kytos.core.helpers import listen_to |
|
8
|
1 |
|
from napps.kytos.flow_manager.storehouse import StoreHouse |
|
9
|
1 |
|
from napps.kytos.of_core.flow import FlowFactory |
|
10
|
|
|
|
|
11
|
1 |
|
from .exceptions import InvalidCommandError |
|
12
|
1 |
|
from .settings import FLOWS_DICT_MAX_SIZE |
|
13
|
|
|
|
|
14
|
|
|
|
|
15
|
1 |
|
class Main(KytosNApp): |
|
16
|
|
|
"""Main class to be used by Kytos controller.""" |
|
17
|
|
|
|
|
18
|
1 |
|
def setup(self): |
|
19
|
|
|
"""Replace the 'init' method for the KytosApp subclass. |
|
20
|
|
|
|
|
21
|
|
|
The setup method is automatically called by the run method. |
|
22
|
|
|
Users shouldn't call this method directly. |
|
23
|
|
|
""" |
|
24
|
1 |
|
log.debug("flow-manager starting") |
|
25
|
1 |
|
self._flow_mods_sent = OrderedDict() |
|
26
|
1 |
|
self._flow_mods_sent_max_size = FLOWS_DICT_MAX_SIZE |
|
27
|
|
|
|
|
28
|
|
|
# object to save and load flows |
|
29
|
1 |
|
self.storehouse = StoreHouse(self.controller) |
|
30
|
1 |
|
self.stored_flows = {} |
|
31
|
1 |
|
self.resended_flows = [] |
|
32
|
|
|
|
|
33
|
1 |
|
def execute(self): |
|
34
|
|
|
"""Run once on NApp 'start' or in a loop. |
|
35
|
|
|
|
|
36
|
|
|
The execute method is called by the run method of KytosNApp class. |
|
37
|
|
|
Users shouldn't call this method directly. |
|
38
|
|
|
""" |
|
39
|
|
|
self._load_flows() |
|
40
|
|
|
|
|
41
|
1 |
|
def shutdown(self): |
|
42
|
|
|
"""Shutdown routine of the NApp.""" |
|
43
|
|
|
log.debug("flow-manager stopping") |
|
44
|
|
|
|
|
45
|
1 |
|
@listen_to('kytos/topology.port.created') |
|
46
|
|
|
def resend_stored_flows(self, event): |
|
47
|
|
|
"""Resend stored Flows.""" |
|
48
|
1 |
|
dpid = str(event.content['switch']) |
|
49
|
1 |
|
switch = self.controller.get_switch_by_dpid(dpid) |
|
50
|
1 |
|
if dpid in self.resended_flows: |
|
51
|
|
|
log.debug(f'Flow already resended to Switch {dpid}') |
|
52
|
|
|
return |
|
53
|
1 |
|
if dpid in self.stored_flows: |
|
54
|
1 |
|
try: |
|
55
|
1 |
|
flow_list = self.stored_flows[dpid]['flow_list'] |
|
56
|
|
|
except KeyError as error: |
|
57
|
|
|
log.info(f'Error to resend stored flow:{error}') |
|
58
|
|
|
return |
|
59
|
1 |
|
for flow in flow_list: |
|
60
|
1 |
|
command = flow['command'] |
|
61
|
1 |
|
flows_dict = flow['data'] |
|
62
|
1 |
|
self._install_flows(command, flows_dict, [switch]) |
|
63
|
1 |
|
self.resended_flows.append(dpid) |
|
64
|
1 |
|
log.info(f'Flows resended to Switch {dpid}') |
|
65
|
|
|
|
|
66
|
|
|
# pylint: disable=attribute-defined-outside-init |
|
67
|
1 |
|
def _load_flows(self): |
|
68
|
|
|
"""Load stored flows.""" |
|
69
|
1 |
|
try: |
|
70
|
1 |
|
data = self.storehouse.get_data()['flow_persistence'] |
|
71
|
1 |
|
if 'id' in data: |
|
72
|
|
|
del data['id'] |
|
73
|
1 |
|
self.stored_flows = data |
|
74
|
|
|
|
|
75
|
|
|
except (KeyError) as error: |
|
76
|
|
|
log.info(f'There are no flows to load : {error}') |
|
77
|
|
|
return |
|
78
|
1 |
|
log.info('Flows loaded.') |
|
79
|
|
|
|
|
80
|
1 |
|
@staticmethod |
|
81
|
|
|
def _generate_match_fields(flows): |
|
82
|
|
|
"""Generate flow match fields.""" |
|
83
|
1 |
|
match_fields = {} |
|
84
|
1 |
|
for fields in flows['flows']: |
|
85
|
1 |
|
if 'priority' in fields: |
|
86
|
1 |
|
match_fields['priority'] = fields['priority'] |
|
87
|
1 |
|
if 'cookie' in fields: |
|
88
|
1 |
|
match_fields['cookie'] = fields['cookie'] |
|
89
|
1 |
|
if 'match' in fields: |
|
90
|
1 |
|
for field, value in fields['match'].items(): |
|
91
|
1 |
|
match_fields[field] = value |
|
92
|
1 |
|
return match_fields |
|
93
|
|
|
|
|
94
|
1 |
|
def _flows_change(self, command, flows, switches): |
|
95
|
|
|
"""Store changed flows.""" |
|
96
|
1 |
|
store_box_updated = self.stored_flows.copy() |
|
97
|
1 |
|
for switch in switches: |
|
98
|
1 |
|
new_flow = {} |
|
99
|
1 |
|
flow_list = [] |
|
100
|
1 |
|
new_flow['command'] = command |
|
101
|
|
|
# The fields to check if the flow is already stored. |
|
102
|
1 |
|
new_flow['match_fields'] = self._generate_match_fields(flows) |
|
103
|
1 |
|
new_flow['data'] = flows |
|
104
|
|
|
|
|
105
|
1 |
|
if switch.id not in store_box_updated: |
|
106
|
|
|
# Switch not stored, add to box. |
|
107
|
1 |
|
flow_list.append(new_flow) |
|
108
|
1 |
|
store_box_updated[switch.id] = {"flow_list": flow_list} |
|
109
|
1 |
|
continue |
|
110
|
|
|
|
|
111
|
1 |
|
stored_flows = store_box_updated[switch.id]['flow_list'] |
|
112
|
|
|
|
|
113
|
|
|
# Check if flow already stored |
|
114
|
1 |
|
for stored_flow in stored_flows: |
|
115
|
1 |
|
if new_flow['match_fields'] == stored_flow['match_fields']: |
|
116
|
|
|
if new_flow['command'] == stored_flow['command']: |
|
117
|
|
|
log.info('Data already stored') |
|
118
|
|
|
return |
|
119
|
|
|
else: |
|
120
|
|
|
# Command conflict. Remove the old flow. |
|
121
|
|
|
# Example: Instruction to add new flow but exist |
|
122
|
|
|
# a stored instruction to remove this flow. |
|
123
|
|
|
# Remove old, and save the new instruction. |
|
124
|
|
|
stored_flow['command'] = new_flow['command'] |
|
125
|
|
|
stored_flows.remove(stored_flow) |
|
126
|
|
|
break |
|
127
|
|
|
|
|
128
|
1 |
|
stored_flows.append(new_flow) |
|
129
|
1 |
|
store_box_updated[switch.id]['flow_list'] = stored_flows |
|
130
|
|
|
|
|
131
|
1 |
|
store_box_updated['id'] = 'flow_persistence' |
|
132
|
1 |
|
self.storehouse.save_flow(store_box_updated) |
|
133
|
1 |
|
del store_box_updated['id'] |
|
134
|
1 |
|
self.stored_flows = store_box_updated.copy() |
|
135
|
|
|
|
|
136
|
1 |
|
@rest('v2/flows') |
|
137
|
1 |
|
@rest('v2/flows/<dpid>') |
|
138
|
1 |
|
def list(self, dpid=None): |
|
139
|
|
|
"""Retrieve all flows from a switch identified by dpid. |
|
140
|
|
|
|
|
141
|
|
|
If no dpid is specified, return all flows from all switches. |
|
142
|
|
|
""" |
|
143
|
1 |
|
if dpid is None: |
|
144
|
1 |
|
switches = self.controller.switches.values() |
|
145
|
|
|
else: |
|
146
|
1 |
|
switches = [self.controller.get_switch_by_dpid(dpid)] |
|
147
|
|
|
|
|
148
|
1 |
|
switch_flows = {} |
|
149
|
|
|
|
|
150
|
1 |
|
for switch in switches: |
|
151
|
1 |
|
flows_dict = [flow.as_dict() for flow in switch.flows] |
|
152
|
1 |
|
switch_flows[switch.dpid] = {'flows': flows_dict} |
|
153
|
|
|
|
|
154
|
1 |
|
return jsonify(switch_flows) |
|
155
|
|
|
|
|
156
|
1 |
|
@rest('v2/flows', methods=['POST']) |
|
157
|
1 |
|
@rest('v2/flows/<dpid>', methods=['POST']) |
|
158
|
1 |
|
def add(self, dpid=None): |
|
159
|
|
|
"""Install new flows in the switch identified by dpid. |
|
160
|
|
|
|
|
161
|
|
|
If no dpid is specified, install flows in all switches. |
|
162
|
|
|
""" |
|
163
|
1 |
|
return self._send_flow_mods_from_request(dpid, "add") |
|
164
|
|
|
|
|
165
|
1 |
|
@rest('v2/delete', methods=['POST']) |
|
166
|
1 |
|
@rest('v2/delete/<dpid>', methods=['POST']) |
|
167
|
1 |
|
@rest('v2/flows', methods=['DELETE']) |
|
168
|
1 |
|
@rest('v2/flows/<dpid>', methods=['DELETE']) |
|
169
|
1 |
|
def delete(self, dpid=None): |
|
170
|
|
|
"""Delete existing flows in the switch identified by dpid. |
|
171
|
|
|
|
|
172
|
|
|
If no dpid is specified, delete flows from all switches. |
|
173
|
|
|
""" |
|
174
|
1 |
|
return self._send_flow_mods_from_request(dpid, "delete") |
|
175
|
|
|
|
|
176
|
1 |
|
def _get_all_switches_enabled(self): |
|
177
|
|
|
"""Get a list of all switches enabled.""" |
|
178
|
1 |
|
switches = self.controller.switches.values() |
|
179
|
1 |
|
return [switch for switch in switches if switch.is_enabled()] |
|
180
|
|
|
|
|
181
|
1 |
|
def _send_flow_mods_from_request(self, dpid, command, flows_dict=None): |
|
182
|
|
|
"""Install FlowsMods from request.""" |
|
183
|
1 |
|
if flows_dict is None: |
|
184
|
1 |
|
flows_dict = request.get_json() |
|
185
|
|
|
|
|
186
|
1 |
|
if flows_dict is None: |
|
187
|
1 |
|
return jsonify({"response": 'flows dict is none.'}), 404 |
|
188
|
|
|
|
|
189
|
1 |
|
if dpid: |
|
190
|
1 |
|
switch = self.controller.get_switch_by_dpid(dpid) |
|
191
|
1 |
|
if not switch: |
|
192
|
1 |
|
return jsonify({"response": 'dpid not found.'}), 404 |
|
193
|
1 |
|
elif switch.is_enabled() is False: |
|
194
|
1 |
|
return jsonify({"response": 'switch is disabled.'}), 404 |
|
195
|
|
|
else: |
|
196
|
1 |
|
self._install_flows(command, flows_dict, [switch]) |
|
197
|
|
|
else: |
|
198
|
1 |
|
self._install_flows(command, flows_dict, |
|
199
|
|
|
self._get_all_switches_enabled()) |
|
200
|
|
|
|
|
201
|
1 |
|
return jsonify({"response": "FlowMod Messages Sent"}) |
|
202
|
|
|
|
|
203
|
1 |
|
def _install_flows(self, command, flows_dict, switches=[]): |
|
204
|
|
|
"""Execute all procedures to install flows in the switches. |
|
205
|
|
|
|
|
206
|
|
|
Args: |
|
207
|
|
|
command: Flow command to be installed |
|
208
|
|
|
flows_dict: Dictionary with flows to be installed in the switches. |
|
209
|
|
|
switches: A list of switches |
|
210
|
|
|
""" |
|
211
|
1 |
|
for switch in switches: |
|
212
|
1 |
|
serializer = FlowFactory.get_class(switch) |
|
213
|
1 |
|
flows = flows_dict.get('flows', []) |
|
214
|
1 |
|
for flow_dict in flows: |
|
215
|
1 |
|
flow = serializer.from_dict(flow_dict, switch) |
|
216
|
1 |
|
if command == "delete": |
|
217
|
|
|
flow_mod = flow.as_of_delete_flow_mod() |
|
218
|
1 |
|
elif command == "add": |
|
219
|
1 |
|
flow_mod = flow.as_of_add_flow_mod() |
|
220
|
|
|
else: |
|
221
|
|
|
raise InvalidCommandError |
|
222
|
1 |
|
self._send_flow_mod(flow.switch, flow_mod) |
|
223
|
1 |
|
self._add_flow_mod_sent(flow_mod.header.xid, flow) |
|
224
|
|
|
|
|
225
|
1 |
|
self._send_napp_event(switch, flow, command) |
|
226
|
1 |
|
self._flows_change(command, flows_dict, switches) |
|
227
|
|
|
|
|
228
|
1 |
|
def _add_flow_mod_sent(self, xid, flow): |
|
229
|
|
|
"""Add the flow mod to the list of flow mods sent.""" |
|
230
|
1 |
|
if len(self._flow_mods_sent) >= self._flow_mods_sent_max_size: |
|
231
|
|
|
self._flow_mods_sent.popitem(last=False) |
|
232
|
1 |
|
self._flow_mods_sent[xid] = flow |
|
233
|
|
|
|
|
234
|
1 |
|
def _send_flow_mod(self, switch, flow_mod): |
|
235
|
1 |
|
event_name = 'kytos/flow_manager.messages.out.ofpt_flow_mod' |
|
236
|
|
|
|
|
237
|
1 |
|
content = {'destination': switch.connection, |
|
238
|
|
|
'message': flow_mod} |
|
239
|
|
|
|
|
240
|
1 |
|
event = KytosEvent(name=event_name, content=content) |
|
241
|
1 |
|
self.controller.buffers.msg_out.put(event) |
|
242
|
|
|
|
|
243
|
1 |
|
def _send_napp_event(self, switch, flow, command, **kwargs): |
|
244
|
|
|
"""Send an Event to other apps informing about a FlowMod.""" |
|
245
|
1 |
|
if command == 'add': |
|
246
|
1 |
|
name = 'kytos/flow_manager.flow.added' |
|
247
|
1 |
|
elif command == 'delete': |
|
248
|
1 |
|
name = 'kytos/flow_manager.flow.removed' |
|
249
|
1 |
|
elif command == 'error': |
|
250
|
1 |
|
name = 'kytos/flow_manager.flow.error' |
|
251
|
|
|
else: |
|
252
|
|
|
raise InvalidCommandError |
|
253
|
1 |
|
content = {'datapath': switch, |
|
254
|
|
|
'flow': flow} |
|
255
|
1 |
|
content.update(kwargs) |
|
256
|
1 |
|
event_app = KytosEvent(name, content) |
|
257
|
1 |
|
self.controller.buffers.app.put(event_app) |
|
258
|
|
|
|
|
259
|
1 |
|
@listen_to('.*.of_core.*.ofpt_error') |
|
260
|
|
|
def handle_errors(self, event): |
|
261
|
|
|
"""Receive OpenFlow error and send a event. |
|
262
|
|
|
|
|
263
|
|
|
The event is sent only if the error is related to a request made |
|
264
|
|
|
by flow_manager. |
|
265
|
|
|
""" |
|
266
|
1 |
|
xid = event.content["message"].header.xid.value |
|
267
|
1 |
|
error_type = event.content["message"].error_type |
|
268
|
1 |
|
error_code = event.content["message"].code |
|
269
|
1 |
|
try: |
|
270
|
1 |
|
flow = self._flow_mods_sent[xid] |
|
271
|
|
|
except KeyError: |
|
272
|
|
|
pass |
|
273
|
|
|
else: |
|
274
|
1 |
|
self._send_napp_event(flow.switch, flow, 'error', |
|
275
|
|
|
error_type=error_type, error_code=error_code) |
|
276
|
|
|
|
kytos /
flow_manager
