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Diffstat (limited to 'src/conf_mode/protocols_pim.py')
| -rw-r--r-- | src/conf_mode/protocols_pim.py | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_pim.py b/src/conf_mode/protocols_pim.py new file mode 100644 index 0000000..79294a1 --- /dev/null +++ b/src/conf_mode/protocols_pim.py @@ -0,0 +1,172 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2020-2024 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 ipaddress import IPv4Address +from ipaddress import IPv4Network +from signal import SIGTERM +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.utils.process import process_named_running +from vyos.utils.process import call +from vyos.template import render_to_string +from vyos import ConfigError +from vyos import frr +from vyos import airbag +airbag.enable() + +RESERVED_MC_NET = '224.0.0.0/24' + + +def get_config(config=None): + if config: + conf = config + else: + conf = Config() + + base = ['protocols', 'pim'] + + pim = conf.get_config_dict(base, key_mangling=('-', '_'), + get_first_key=True, no_tag_node_value_mangle=True) + + # We can not run both IGMP proxy and PIM at the same time - get IGMP + # proxy status + if conf.exists(['protocols', 'igmp-proxy']): + pim.update({'igmp_proxy_enabled' : {}}) + + # 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: + pim['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): + pim.update({'deleted' : ''}) + return pim + + # 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(**pim.kwargs, recursive=True) + + # 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. + for interface in pim.get('interface', []): + # We need to reload the defaults on every pass b/c of + # hello-multiplier dependency on dead-interval + # If hello-multiplier is set, we need to remove the default from + # dead-interval. + if 'igmp' not in pim['interface'][interface]: + del default_values['interface'][interface]['igmp'] + + pim = config_dict_merge(default_values, pim) + return pim + +def verify(pim): + if not pim or 'deleted' in pim: + return None + + if 'igmp_proxy_enabled' in pim: + raise ConfigError('IGMP proxy and PIM cannot be configured at the same time!') + + if 'interface' not in pim: + raise ConfigError('PIM require defined interfaces!') + + for interface, interface_config in pim['interface'].items(): + verify_interface_exists(pim, interface) + + # Check join group in reserved net + if 'igmp' in interface_config and 'join' in interface_config['igmp']: + for join_addr in interface_config['igmp']['join']: + if IPv4Address(join_addr) in IPv4Network(RESERVED_MC_NET): + raise ConfigError(f'Groups within {RESERVED_MC_NET} are reserved and cannot be joined!') + + if 'rp' in pim: + if 'address' not in pim['rp']: + raise ConfigError('PIM rendezvous point needs to be defined!') + + # Check unique multicast groups + unique = [] + pim_base_error = 'PIM rendezvous point group' + for address, address_config in pim['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 IPv4Network(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(pim): + if not pim or 'deleted' in pim: + return None + pim['frr_pimd_config'] = render_to_string('frr/pimd.frr.j2', pim) + return None + +def apply(pim): + pim_daemon = 'pimd' + pim_pid = process_named_running(pim_daemon) + + if not pim or 'deleted' in pim: + if 'deleted' in pim: + os.kill(int(pim_pid), SIGTERM) + + return None + + if not pim_pid: + call('/usr/lib/frr/pimd -d -F traditional --daemon -A 127.0.0.1') + + # Save original configuration prior to starting any commit actions + frr_cfg = frr.FRRConfig() + + frr_cfg.load_configuration(pim_daemon) + frr_cfg.modify_section(f'^ip pim') + frr_cfg.modify_section(f'^ip igmp') + + for key in ['interface', 'interface_removed']: + if key not in pim: + continue + for interface in pim[key]: + frr_cfg.modify_section(f'^interface {interface}', stop_pattern='^exit', remove_stop_mark=True) + + if 'frr_pimd_config' in pim: + frr_cfg.add_before(frr.default_add_before, pim['frr_pimd_config']) + frr_cfg.commit_configuration(pim_daemon) + return None + +if __name__ == '__main__': + try: + c = get_config() + verify(c) + generate(c) + apply(c) + except ConfigError as e: + print(e) + exit(1) |