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protocols_pim.py
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protocols_pim.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 sys
import jinja2
import copy
import os
import vyos.validate
from ipaddress import IPv4Address
from vyos import ConfigError
from vyos.config import Config
config_file = r'/tmp/pimd.frr'
# Please be careful if you edit the template.
config_tmpl = """
!
{% for rp_addr in old_pim.rp -%}
{% for group in old_pim.rp[rp_addr] -%}
no ip pim rp {{ rp_addr }} {{ group }}
{% endfor -%}
{% endfor -%}
{% if old_pim.rp_keep_alive -%}
no ip pim rp keep-alive-timer {{ old_pim.rp_keep_alive }}
{% endif -%}
{% for iface in old_pim.ifaces -%}
interface {{ iface }}
no ip pim
!
{% endfor -%}
{% for iface in pim.ifaces -%}
interface {{ iface }}
{% if pim.ifaces[iface].hello -%}
ip pim hello {{ pim.ifaces[iface].hello }}
{% endif -%}
ip pim
!
{% endfor -%}
{% for rp_addr in pim.rp -%}
{% for group in pim.rp[rp_addr] -%}
ip pim rp {{ rp_addr }} {{ group }}
{% endfor -%}
{% endfor -%}
{% if pim.rp_keep_alive -%}
ip pim rp keep-alive-timer {{ pim.rp_keep_alive }}
{% endif -%}
!
"""
def get_config():
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))
}
})
for iface in conf.list_nodes('interface'):
pim_conf['pim']['ifaces'].update({
iface : {
'hello' : conf.return_value('interface {0} hello'.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
tmpl = jinja2.Template(config_tmpl)
config_text = tmpl.render(pim)
with open(config_file, 'w') as f:
f.write(config_text)
return None
def apply(pim):
if pim is None:
return None
if os.path.exists(config_file):
os.system("sudo 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)
sys.exit(1)

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