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protocols_igmp.py
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protocols_igmp.py
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#!/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 import ConfigError
from vyos.config import Config
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/igmp.frr'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
igmp_conf = {
'igmp_conf' : False,
'pim_conf' : False,
'igmp_proxy_conf' : False,
'old_ifaces' : {},
'ifaces' : {}
}
if not (conf.exists('protocols igmp') or conf.exists_effective('protocols igmp')):
return None
if conf.exists('protocols igmp-proxy'):
igmp_conf['igmp_proxy_conf'] = True
if conf.exists('protocols pim'):
igmp_conf['pim_conf'] = True
if conf.exists('protocols igmp'):
igmp_conf['igmp_conf'] = True
conf.set_level('protocols igmp')
# # Get interfaces
for iface in conf.list_effective_nodes('interface'):
igmp_conf['old_ifaces'].update({
iface : {
'version' : conf.return_effective_value('interface {0} version'.format(iface)),
'query_interval' : conf.return_effective_value('interface {0} query-interval'.format(iface)),
'query_max_resp_time' : conf.return_effective_value('interface {0} query-max-response-time'.format(iface)),
'gr_join' : {}
}
})
for gr_join in conf.list_effective_nodes('interface {0} join'.format(iface)):
igmp_conf['old_ifaces'][iface]['gr_join'][gr_join] = conf.return_effective_values('interface {0} join {1} source'.format(iface, gr_join))
for iface in conf.list_nodes('interface'):
igmp_conf['ifaces'].update({
iface : {
'version' : conf.return_value('interface {0} version'.format(iface)),
'query_interval' : conf.return_value('interface {0} query-interval'.format(iface)),
'query_max_resp_time' : conf.return_value('interface {0} query-max-response-time'.format(iface)),
'gr_join' : {}
}
})
for gr_join in conf.list_nodes('interface {0} join'.format(iface)):
igmp_conf['ifaces'][iface]['gr_join'][gr_join] = conf.return_values('interface {0} join {1} source'.format(iface, gr_join))
return igmp_conf
def verify(igmp):
if igmp is None:
return None
if igmp['igmp_conf']:
# Check conflict with IGMP-Proxy
if igmp['igmp_proxy_conf']:
raise ConfigError(f"IGMP proxy and PIM cannot be both configured at the same time")
# Check interfaces
if not igmp['ifaces']:
raise ConfigError(f"IGMP require defined interfaces!")
# Check, is this multicast group
for intfc in igmp['ifaces']:
for gr_addr in igmp['ifaces'][intfc]['gr_join']:
if IPv4Address(gr_addr) < IPv4Address('224.0.0.0'):
raise ConfigError(gr_addr + " not a multicast group")
def generate(igmp):
if igmp is None:
return None
render(config_file, 'frr/igmp.frr.tmpl', igmp)
return None
def apply(igmp):
if igmp is None:
return None
pim_pid = process_named_running('pimd')
if igmp['igmp_conf'] or igmp['pim_conf']:
if not pim_pid:
call(pimd_cmd)
if os.path.exists(config_file):
call(f'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)

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