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
|
#!/usr/bin/env python3
#
# Copyright (C) 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 sys import argv
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.configdict import node_changed
from vyos.configverify import verify_common_route_maps
from vyos.configverify import verify_route_map
from vyos.configverify import verify_interface_exists
from vyos.template import render_to_string
from vyos.ifconfig import Interface
from vyos.util import dict_search
from vyos.util import get_interface_config
from vyos.xml import defaults
from vyos import ConfigError
from vyos import frr
from vyos import airbag
airbag.enable()
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
vrf = None
if len(argv) > 1:
vrf = argv[1]
base_path = ['protocols', 'ospfv3']
# eqivalent of the C foo ? 'a' : 'b' statement
base = vrf and ['vrf', 'name', vrf, 'protocols', 'ospfv3'] or base_path
ospfv3 = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# Assign the name of our VRF context. This MUST be done before the return
# statement below, else on deletion we will delete the default instance
# instead of the VRF instance.
if vrf: ospfv3['vrf'] = vrf
# FRR has VRF support for different routing daemons. As interfaces belong
# to VRFs - or the global VRF, we need to check for changed interfaces so
# that they will be properly rendered for the FRR config. Also this eases
# removal of interfaces from the running configuration.
interfaces_removed = node_changed(conf, base + ['interface'])
if interfaces_removed:
ospfv3['interface_removed'] = list(interfaces_removed)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
ospfv3.update({'deleted' : ''})
return ospfv3
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
# XXX: Note that we can not call defaults(base), as defaults does not work
# on an instance of a tag node. As we use the exact same CLI definition for
# both the non-vrf and vrf version this is absolutely safe!
default_values = defaults(base_path)
# We have to cleanup the default dict, as default values could enable features
# which are not explicitly enabled on the CLI. Example: default-information
# originate comes with a default metric-type of 2, which will enable the
# entire default-information originate tree, even when not set via CLI so we
# need to check this first and probably drop that key.
if dict_search('default_information.originate', ospfv3) is None:
del default_values['default_information']
# XXX: T2665: we currently have no nice way for defaults under tag nodes,
# clean them out and add them manually :(
del default_values['interface']
# merge in remaining default values
ospfv3 = dict_merge(default_values, ospfv3)
# We also need some additional information from the config, prefix-lists
# and route-maps for instance. They will be used in verify().
#
# XXX: one MUST always call this without the key_mangling() option! See
# vyos.configverify.verify_common_route_maps() for more information.
tmp = conf.get_config_dict(['policy'])
# Merge policy dict into "regular" config dict
ospfv3 = dict_merge(tmp, ospfv3)
return ospfv3
def verify(ospfv3):
if not ospfv3:
return None
verify_common_route_maps(ospfv3)
# As we can have a default-information route-map, we need to validate it!
route_map_name = dict_search('default_information.originate.route_map', ospfv3)
if route_map_name: verify_route_map(route_map_name, ospfv3)
if 'area' in ospfv3:
for area, area_config in ospfv3['area'].items():
if 'area_type' in area_config:
if len(area_config['area_type']) > 1:
raise ConfigError(f'Can only configure one area-type for OSPFv3 area "{area}"!')
if 'range' in area_config:
for range, range_config in area_config['range'].items():
if {'not_advertise', 'advertise'} <= range_config.keys():
raise ConfigError(f'"not-advertise" and "advertise" for "range {range}" cannot be both configured at the same time!')
if 'interface' in ospfv3:
for interface, interface_config in ospfv3['interface'].items():
verify_interface_exists(interface)
if 'ifmtu' in interface_config:
mtu = Interface(interface).get_mtu()
if int(interface_config['ifmtu']) > int(mtu):
raise ConfigError(f'OSPFv3 ifmtu can not exceed physical MTU of "{mtu}"')
# If interface specific options are set, we must ensure that the
# interface is bound to our requesting VRF. Due to the VyOS
# priorities the interface is bound to the VRF after creation of
# the VRF itself, and before any routing protocol is configured.
if 'vrf' in ospfv3:
vrf = ospfv3['vrf']
tmp = get_interface_config(interface)
if 'master' not in tmp or tmp['master'] != vrf:
raise ConfigError(f'Interface {interface} is not a member of VRF {vrf}!')
return None
def generate(ospfv3):
if not ospfv3 or 'deleted' in ospfv3:
return None
ospfv3['new_frr_config'] = render_to_string('frr/ospf6d.frr.j2', ospfv3)
return None
def apply(ospfv3):
ospf6_daemon = 'ospf6d'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
# Generate empty helper string which can be ammended to FRR commands, it
# will be either empty (default VRF) or contain the "vrf <name" statement
vrf = ''
if 'vrf' in ospfv3:
vrf = ' vrf ' + ospfv3['vrf']
frr_cfg.load_configuration(ospf6_daemon)
frr_cfg.modify_section(f'^router ospf6{vrf}', stop_pattern='^exit', remove_stop_mark=True)
for key in ['interface', 'interface_removed']:
if key not in ospfv3:
continue
for interface in ospfv3[key]:
frr_cfg.modify_section(f'^interface {interface}{vrf}', stop_pattern='^exit', remove_stop_mark=True)
if 'new_frr_config' in ospfv3:
frr_cfg.add_before(frr.default_add_before, ospfv3['new_frr_config'])
frr_cfg.commit_configuration(ospf6_daemon)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
