1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from netifaces import interfaces
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.configdict import node_changed
from vyos.configdict import leaf_node_changed
from vyos.template import render
from vyos.util import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['policy']
pbr = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
for route in ['local_route', 'local_route6']:
dict_id = 'rule_remove' if route == 'local_route' else 'rule6_remove'
route_key = 'local-route' if route == 'local_route' else 'local-route6'
base_rule = base + [route_key, 'rule']
# delete policy local-route
dict = {}
tmp = node_changed(conf, base_rule, key_mangling=('-', '_'))
if tmp:
for rule in (tmp or []):
src = leaf_node_changed(conf, base_rule + [rule, 'source'])
fwmk = leaf_node_changed(conf, base_rule + [rule, 'fwmark'])
iif = leaf_node_changed(conf, base_rule + [rule, 'inbound-interface'])
dst = leaf_node_changed(conf, base_rule + [rule, 'destination'])
rule_def = {}
if src:
rule_def = dict_merge({'source' : src}, rule_def)
if fwmk:
rule_def = dict_merge({'fwmark' : fwmk}, rule_def)
if iif:
rule_def = dict_merge({'inbound_interface' : iif}, rule_def)
if dst:
rule_def = dict_merge({'destination' : dst}, rule_def)
dict = dict_merge({dict_id : {rule : rule_def}}, dict)
pbr.update(dict)
if not route in pbr:
continue
# delete policy local-route rule x source x.x.x.x
# delete policy local-route rule x fwmark x
# delete policy local-route rule x destination x.x.x.x
if 'rule' in pbr[route]:
for rule, rule_config in pbr[route]['rule'].items():
src = leaf_node_changed(conf, base_rule + [rule, 'source'])
fwmk = leaf_node_changed(conf, base_rule + [rule, 'fwmark'])
iif = leaf_node_changed(conf, base_rule + [rule, 'inbound-interface'])
dst = leaf_node_changed(conf, base_rule + [rule, 'destination'])
# keep track of changes in configuration
# otherwise we might remove an existing node although nothing else has changed
changed = False
rule_def = {}
# src is None if there are no changes to src
if src is None:
# if src hasn't changed, include it in the removal selector
# if a new selector is added, we have to remove all previous rules without this selector
# to make sure we remove all previous rules with this source(s), it will be included
if 'source' in rule_config:
rule_def = dict_merge({'source': rule_config['source']}, rule_def)
else:
# if src is not None, it's previous content will be returned
# this can be an empty array if it's just being set, or the previous value
# either way, something has to be changed and we only want to remove previous values
changed = True
# set the old value for removal if it's not empty
if len(src) > 0:
rule_def = dict_merge({'source' : src}, rule_def)
if fwmk is None:
if 'fwmark' in rule_config:
rule_def = dict_merge({'fwmark': [rule_config['fwmark']]}, rule_def)
else:
changed = True
if len(fwmk) > 0:
rule_def = dict_merge({'fwmark' : fwmk}, rule_def)
if iif is None:
if 'inbound_interface' in rule_config:
rule_def = dict_merge({'inbound_interface': [rule_config['inbound_interface']]}, rule_def)
else:
changed = True
if len(iif) > 0:
rule_def = dict_merge({'inbound_interface' : iif}, rule_def)
if dst is None:
if 'destination' in rule_config:
rule_def = dict_merge({'destination': rule_config['destination']}, rule_def)
else:
changed = True
if len(dst) > 0:
rule_def = dict_merge({'destination' : dst}, rule_def)
if changed:
dict = dict_merge({dict_id : {rule : rule_def}}, dict)
pbr.update(dict)
return pbr
def verify(pbr):
# bail out early - looks like removal from running config
if not pbr:
return None
for route in ['local_route', 'local_route6']:
if not route in pbr:
continue
pbr_route = pbr[route]
if 'rule' in pbr_route:
for rule in pbr_route['rule']:
if 'source' not in pbr_route['rule'][rule] \
and 'destination' not in pbr_route['rule'][rule] \
and 'fwmark' not in pbr_route['rule'][rule] \
and 'inbound_interface' not in pbr_route['rule'][rule]:
raise ConfigError('Source or destination address or fwmark or inbound-interface is required!')
else:
if 'set' not in pbr_route['rule'][rule] or 'table' not in pbr_route['rule'][rule]['set']:
raise ConfigError('Table set is required!')
if 'inbound_interface' in pbr_route['rule'][rule]:
interface = pbr_route['rule'][rule]['inbound_interface']
if interface not in interfaces():
raise ConfigError(f'Interface "{interface}" does not exist')
return None
def generate(pbr):
if not pbr:
return None
return None
def apply(pbr):
if not pbr:
return None
# Delete old rule if needed
for rule_rm in ['rule_remove', 'rule6_remove']:
if rule_rm in pbr:
v6 = " -6" if rule_rm == 'rule6_remove' else ""
for rule, rule_config in pbr[rule_rm].items():
rule_config['source'] = rule_config['source'] if 'source' in rule_config else ['']
for src in rule_config['source']:
f_src = '' if src == '' else f' from {src} '
rule_config['destination'] = rule_config['destination'] if 'destination' in rule_config else ['']
for dst in rule_config['destination']:
f_dst = '' if dst == '' else f' to {dst} '
rule_config['fwmark'] = rule_config['fwmark'] if 'fwmark' in rule_config else ['']
for fwmk in rule_config['fwmark']:
f_fwmk = '' if fwmk == '' else f' fwmark {fwmk} '
rule_config['inbound_interface'] = rule_config['inbound_interface'] if 'inbound_interface' in rule_config else ['']
for iif in rule_config['inbound_interface']:
f_iif = '' if iif == '' else f' iif {iif} '
call(f'ip{v6} rule del prio {rule} {f_src}{f_dst}{f_fwmk}{f_iif}')
# Generate new config
for route in ['local_route', 'local_route6']:
if not route in pbr:
continue
v6 = " -6" if route == 'local_route6' else ""
pbr_route = pbr[route]
if 'rule' in pbr_route:
for rule, rule_config in pbr_route['rule'].items():
table = rule_config['set']['table']
rule_config['source'] = rule_config['source'] if 'source' in rule_config else ['all']
for src in rule_config['source'] or ['all']:
f_src = '' if src == '' else f' from {src} '
rule_config['destination'] = rule_config['destination'] if 'destination' in rule_config else ['all']
for dst in rule_config['destination']:
f_dst = '' if dst == '' else f' to {dst} '
f_fwmk = ''
if 'fwmark' in rule_config:
fwmk = rule_config['fwmark']
f_fwmk = f' fwmark {fwmk} '
f_iif = ''
if 'inbound_interface' in rule_config:
iif = rule_config['inbound_interface']
f_iif = f' iif {iif} '
call(f'ip{v6} rule add prio {rule} {f_src}{f_dst}{f_fwmk}{f_iif} lookup {table}')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
