#!/usr/bin/env python3 # # Copyright (C) 2020 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 sys import exit from vyos.config import Config from vyos import ConfigError from vyos.util import call, process_named_running from vyos.template import render from signal import SIGTERM from vyos import airbag airbag.enable() # Required to use the full path to pimd, in another case daemon will not be started pimd_cmd = f'/usr/lib/frr/pimd -d -F traditional --daemon -A 127.0.0.1' config_file = r'/tmp/pimd.frr' def get_config(config=None): if config: conf = config else: conf = Config() pim_conf = { 'pim_conf' : False, 'igmp_conf' : False, 'igmp_proxy_conf' : False, 'old_pim' : { 'ifaces' : {}, 'rp' : {} }, 'pim' : { 'ifaces' : {}, 'rp' : {} } } if not (conf.exists('protocols pim') or conf.exists_effective('protocols pim')): return None if conf.exists('protocols igmp-proxy'): pim_conf['igmp_proxy_conf'] = True if conf.exists('protocols igmp'): pim_conf['igmp_conf'] = True if conf.exists('protocols pim'): pim_conf['pim_conf'] = True conf.set_level('protocols pim') # Get interfaces for iface in conf.list_effective_nodes('interface'): pim_conf['old_pim']['ifaces'].update({ iface : { 'hello' : conf.return_effective_value('interface {0} hello'.format(iface)), 'dr_prio' : conf.return_effective_value('interface {0} dr-priority'.format(iface)) } }) for iface in conf.list_nodes('interface'): pim_conf['pim']['ifaces'].update({ iface : { 'hello' : conf.return_value('interface {0} hello'.format(iface)), 'dr_prio' : conf.return_value('interface {0} dr-priority'.format(iface)), } }) conf.set_level('protocols pim rp') # Get RPs addresses for rp_addr in conf.list_effective_nodes('address'): pim_conf['old_pim']['rp'][rp_addr] = conf.return_effective_values('address {0} group'.format(rp_addr)) for rp_addr in conf.list_nodes('address'): pim_conf['pim']['rp'][rp_addr] = conf.return_values('address {0} group'.format(rp_addr)) # Get RP keep-alive-timer if conf.exists_effective('rp keep-alive-timer'): pim_conf['old_pim']['rp_keep_alive'] = conf.return_effective_value('rp keep-alive-timer') if conf.exists('rp keep-alive-timer'): pim_conf['pim']['rp_keep_alive'] = conf.return_value('rp keep-alive-timer') return pim_conf def verify(pim): if pim is None: return None if pim['pim_conf']: # Check conflict with IGMP-Proxy if pim['igmp_proxy_conf']: raise ConfigError(f"IGMP proxy and PIM cannot be both configured at the same time") # Check interfaces if not pim['pim']['ifaces']: raise ConfigError(f"PIM require defined interfaces!") if not pim['pim']['rp']: raise ConfigError(f"RP address required") # Check unique multicast groups uniq_groups = [] for rp_addr in pim['pim']['rp']: if not pim['pim']['rp'][rp_addr]: raise ConfigError(f"Group should be specified for RP " + rp_addr) for group in pim['pim']['rp'][rp_addr]: if (group in uniq_groups): raise ConfigError(f"Group range " + group + " specified cannot exact match another") # Check, is this multicast group gr_addr = group.split('/') if IPv4Address(gr_addr[0]) < IPv4Address('224.0.0.0'): raise ConfigError(group + " not a multicast group") uniq_groups.extend(pim['pim']['rp'][rp_addr]) def generate(pim): if pim is None: return None render(config_file, 'frr/pimd.frr.tmpl', pim) return None def apply(pim): if pim is None: return None pim_pid = process_named_running('pimd') if pim['igmp_conf'] or pim['pim_conf']: if not pim_pid: call(pimd_cmd) if os.path.exists(config_file): call("vtysh -d pimd -f " + config_file) os.remove(config_file) elif pim_pid: os.kill(int(pim_pid), SIGTERM) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)