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protocols_nhrp.py
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protocols_nhrp.py
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#!/usr/bin/env python3
#
# Copyright (C) 2021 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/>.
from vyos.config import Config
from vyos.configdict import node_changed
from vyos.firewall import find_nftables_rule
from vyos.firewall import remove_nftables_rule
from vyos.template import render
from vyos.util import process_named_running
from vyos.util import run
from vyos import ConfigError
from vyos import airbag
airbag.enable()
opennhrp_conf = '/run/opennhrp/opennhrp.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['protocols', 'nhrp']
nhrp = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
nhrp['del_tunnels'] = node_changed(conf, base + ['tunnel'], key_mangling=('-', '_'))
if not conf.exists(base):
return nhrp
nhrp['if_tunnel'] = conf.get_config_dict(['interfaces', 'tunnel'], key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
nhrp['profile_map'] = {}
profile = conf.get_config_dict(['vpn', 'ipsec', 'profile'], key_mangling=('-', '_'),
get_first_key=True, no_tag_node_value_mangle=True)
for name, profile_conf in profile.items():
if 'bind' in profile_conf and 'tunnel' in profile_conf['bind']:
interfaces = profile_conf['bind']['tunnel']
if isinstance(interfaces, str):
interfaces = [interfaces]
for interface in interfaces:
nhrp['profile_map'][interface] = name
return nhrp
def verify(nhrp):
if 'tunnel' in nhrp:
for name, nhrp_conf in nhrp['tunnel'].items():
if not nhrp['if_tunnel'] or name not in nhrp['if_tunnel']:
raise ConfigError(f'Tunnel interface "{name}" does not exist')
tunnel_conf = nhrp['if_tunnel'][name]
if 'encapsulation' not in tunnel_conf or tunnel_conf['encapsulation'] != 'gre':
raise ConfigError(f'Tunnel "{name}" is not an mGRE tunnel')
if 'remote' in tunnel_conf:
raise ConfigError(f'Tunnel "{name}" cannot have a remote address defined')
if 'map' in nhrp_conf:
for map_name, map_conf in nhrp_conf['map'].items():
if 'nbma_address' not in map_conf:
raise ConfigError(f'nbma-address missing on map {map_name} on tunnel {name}')
if 'dynamic_map' in nhrp_conf:
for map_name, map_conf in nhrp_conf['dynamic_map'].items():
if 'nbma_domain_name' not in map_conf:
raise ConfigError(f'nbma-domain-name missing on dynamic-map {map_name} on tunnel {name}')
return None
def generate(nhrp):
render(opennhrp_conf, 'nhrp/opennhrp.conf.tmpl', nhrp)
return None
def apply(nhrp):
if 'tunnel' in nhrp:
for tunnel, tunnel_conf in nhrp['tunnel'].items():
if 'source_address' in nhrp['if_tunnel'][tunnel]:
comment = f'VYOS_NHRP_{tunnel}'
source_address = nhrp['if_tunnel'][tunnel]['source_address']
rule_handle = find_nftables_rule('ip filter', 'VYOS_FW_OUTPUT', ['ip protocol gre', f'ip saddr {source_address}', 'ip daddr 224.0.0.0/4'])
if not rule_handle:
run(f'sudo nft insert rule ip filter VYOS_FW_OUTPUT ip protocol gre ip saddr {source_address} ip daddr 224.0.0.0/4 counter drop comment "{comment}"')
for tunnel in nhrp['del_tunnels']:
comment = f'VYOS_NHRP_{tunnel}'
rule_handle = find_nftables_rule('ip filter', 'VYOS_FW_OUTPUT', [f'comment "{comment}"'])
if rule_handle:
remove_nftables_rule('ip filter', 'VYOS_FW_OUTPUT', rule_handle)
action = 'restart' if nhrp and 'tunnel' in nhrp else 'stop'
run(f'systemctl {action} opennhrp')
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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