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#!/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 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_interface_exists
from vyos.util import call
from vyos.util import dict_search
from vyos.util import get_interface_config
from vyos.template import render_to_string
from vyos import ConfigError
from vyos import frr
from vyos import airbag
airbag.enable()
frr_daemon = 'isisd'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
vrf = None
if len(argv) > 1:
vrf = argv[1]
base_path = ['protocols', 'isis']
# eqivalent of the C foo ? 'a' : 'b' statement
base = vrf and ['vrf', 'name', vrf, 'protocols', 'isis'] or base_path
isis = 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: isis['vrf'] = vrf
# As we no re-use this Python handler for both VRF and non VRF instances for
# IS-IS we need to find out if any interfaces changed so properly adjust
# the FRR configuration and not by acctident change interfaces from a
# different VRF.
interfaces_removed = node_changed(conf, base + ['interface'])
if interfaces_removed:
isis['interface_removed'] = list(interfaces_removed)
# Bail out early if configuration tree does not exist
if not conf.exists(base):
isis.update({'deleted' : ''})
return isis
# We also need some additional information from the config, prefix-lists
# and route-maps for instance. They will be used in verify()
base = ['policy']
tmp = conf.get_config_dict(base, key_mangling=('-', '_'))
# Merge policy dict into OSPF dict
isis = dict_merge(tmp, isis)
return isis
def verify(isis):
# bail out early - looks like removal from running config
if not isis or 'deleted' in isis:
return None
if 'domain' not in isis:
raise ConfigError('Routing domain name/tag must be set!')
if 'net' not in isis:
raise ConfigError('Network entity is mandatory!')
# last byte in IS-IS area address must be 0
tmp = isis['net'].split('.')
if int(tmp[-1]) != 0:
raise ConfigError('Last byte of IS-IS network entity title must always be 0!')
# If interface not set
if 'interface' not in isis:
raise ConfigError('Interface used for routing updates is mandatory!')
for interface in isis['interface']:
verify_interface_exists(interface)
if 'vrf' in isis:
# 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.
vrf = isis['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}!')
# If md5 and plaintext-password set at the same time
if 'area_password' in isis:
if {'md5', 'plaintext_password'} <= set(isis['encryption']):
raise ConfigError('Can not use both md5 and plaintext-password for ISIS area-password!')
# If one param from delay set, but not set others
if 'spf_delay_ietf' in isis:
required_timers = ['holddown', 'init_delay', 'long_delay', 'short_delay', 'time_to_learn']
exist_timers = []
for elm_timer in required_timers:
if elm_timer in isis['spf_delay_ietf']:
exist_timers.append(elm_timer)
exist_timers = set(required_timers).difference(set(exist_timers))
if len(exist_timers) > 0:
raise ConfigError('All types of delay must be specified: ' + ', '.join(exist_timers).replace('_', '-'))
# If Redistribute set, but level don't set
if 'redistribute' in isis:
proc_level = isis.get('level','').replace('-','_')
for afi in ['ipv4']:
if afi not in isis['redistribute']:
continue
for proto, proto_config in isis['redistribute'][afi].items():
if 'level_1' not in proto_config and 'level_2' not in proto_config:
raise ConfigError(f'Redistribute level-1 or level-2 should be specified in ' \
f'"protocols isis {process} redistribute {afi} {proto}"!')
for redistr_level, redistr_config in proto_config.items():
if proc_level and proc_level != 'level_1_2' and proc_level != redistr_level:
raise ConfigError(f'"protocols isis {process} redistribute {afi} {proto} {redistr_level}" ' \
f'can not be used with \"protocols isis {process} level {proc_level}\"')
if 'route_map' in redistr_config:
name = redistr_config['route_map']
tmp = name.replace('-', '_')
if dict_search(f'policy.route_map.{tmp}', isis) == None:
raise ConfigError(f'Route-map {name} does not exist!')
# Segment routing checks
if dict_search('segment_routing.global_block', isis):
high_label_value = dict_search('segment_routing.global_block.high_label_value', isis)
low_label_value = dict_search('segment_routing.global_block.low_label_value', isis)
# If segment routing global block high value is blank, throw error
if (low_label_value and not high_label_value) or (high_label_value and not low_label_value):
raise ConfigError('Segment routing global block requires both low and high value!')
# If segment routing global block low value is higher than the high value, throw error
if int(low_label_value) > int(high_label_value):
raise ConfigError('Segment routing global block low value must be lower than high value')
if dict_search('segment_routing.local_block', isis):
high_label_value = dict_search('segment_routing.local_block.high_label_value', isis)
low_label_value = dict_search('segment_routing.local_block.low_label_value', isis)
# If segment routing local block high value is blank, throw error
if (low_label_value and not high_label_value) or (high_label_value and not low_label_value):
raise ConfigError('Segment routing local block requires both high and low value!')
# If segment routing local block low value is higher than the high value, throw error
if int(low_label_value) > int(high_label_value):
raise ConfigError('Segment routing local block low value must be lower than high value')
return None
def generate(isis):
if not isis or 'deleted' in isis:
isis['new_frr_config'] = ''
return None
isis['new_frr_config'] = render_to_string('frr/isis.frr.tmpl', isis)
return None
def apply(isis):
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(frr_daemon)
# 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 isis:
vrf = 'vrf ' + isis['vrf']
frr_cfg.modify_section(f'^router isis \S+ {vrf}', '')
for key in ['interface', 'interface_removed']:
if key not in isis:
continue
for interface in isis[key]:
frr_cfg.modify_section(f'^interface {interface}{vrf}$', '')
frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', isis['new_frr_config'])
frr_cfg.commit_configuration(frr_daemon)
# If FRR config is blank, rerun the blank commit x times due to frr-reload
# behavior/bug not properly clearing out on one commit.
if isis['new_frr_config'] == '':
for a in range(5):
frr_cfg.commit_configuration(frr_daemon)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
|
