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#!/usr/bin/env python3
#
# Copyright (C) 2023 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/>.
from ipaddress import IPv6Address
from ipaddress import IPv6Network
from sys import exit
from vyos.config import Config
from vyos.config import config_dict_merge
from vyos.configdict import node_changed
from vyos.configverify import verify_interface_exists
from vyos.template import render_to_string
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()
base = ['protocols', 'pim6']
pim6 = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True, with_recursive_defaults=True)
# 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:
pim6['interface_removed'] = list(interfaces_removed)
# Bail out early if configuration tree does no longer exist. this must
# be done after retrieving the list of interfaces to be removed.
if not conf.exists(base):
pim6.update({'deleted' : ''})
return pim6
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_values = conf.get_config_defaults(**pim6.kwargs, recursive=True)
pim6 = config_dict_merge(default_values, pim6)
return pim6
def verify(pim6):
if not pim6 or 'deleted' in pim6:
return
for interface, interface_config in pim6.get('interface', {}).items():
verify_interface_exists(interface)
if 'mld' in interface_config:
mld = interface_config['mld']
for group in mld.get('join', {}).keys():
# Validate multicast group address
if not IPv6Address(group).is_multicast:
raise ConfigError(f"{group} is not a multicast group")
if 'rp' in pim6:
if 'address' not in pim6['rp']:
raise ConfigError('PIM6 rendezvous point needs to be defined!')
# Check unique multicast groups
unique = []
pim_base_error = 'PIM6 rendezvous point group'
if {'address', 'prefix-list6'} <= set(pim6['rp']):
raise ConfigError(f'{pim_base_error} supports either address or a prefix-list!')
for address, address_config in pim6['rp']['address'].items():
if 'group' not in address_config:
raise ConfigError(f'{pim_base_error} should be defined for "{address}"!')
# Check if it is a multicast group
for gr_addr in address_config['group']:
if not IPv6Network(gr_addr).is_multicast:
raise ConfigError(f'{pim_base_error} "{gr_addr}" is not a multicast group!')
if gr_addr in unique:
raise ConfigError(f'{pim_base_error} must be unique!')
unique.append(gr_addr)
def generate(pim6):
if not pim6 or 'deleted' in pim6:
return
pim6['new_frr_config'] = render_to_string('frr/pim6d.frr.j2', pim6)
return None
def apply(pim6):
if pim6 is None:
return
pim6_daemon = 'pim6d'
# Save original configuration prior to starting any commit actions
frr_cfg = frr.FRRConfig()
frr_cfg.load_configuration(pim6_daemon)
for key in ['interface', 'interface_removed']:
if key not in pim6:
continue
for interface in pim6[key]:
frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True)
if 'new_frr_config' in pim6:
frr_cfg.add_before(frr.default_add_before, pim6['new_frr_config'])
frr_cfg.commit_configuration(pim6_daemon)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)
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