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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.config import Config
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
from vyos import airbag
airbag.enable()
config_file = r'/tmp/pimd.frr'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
pim_conf = {
'pim_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 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 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
if os.path.exists(config_file):
call("vtysh -d pimd -f " + config_file)
os.remove(config_file)
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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