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authorsarthurdev <965089+sarthurdev@users.noreply.github.com>2021-05-31 12:08:48 +0200
committersarthurdev <965089+sarthurdev@users.noreply.github.com>2021-06-06 00:14:10 +0200
commitb3bce6497cc20cad687efc818d679d71d62fbd26 (patch)
tree67ccbd191f824de18d8b39f0694c040c65e38e78 /src/conf_mode/protocols_nhrp.py
parent77866ccb16194a2446b2faccb52ec852aa882b96 (diff)
downloadvyos-1x-b3bce6497cc20cad687efc818d679d71d62fbd26.tar.gz
vyos-1x-b3bce6497cc20cad687efc818d679d71d62fbd26.zip
nhrp: T3599: Migrate NHRP to XML/Python
Diffstat (limited to 'src/conf_mode/protocols_nhrp.py')
-rwxr-xr-xsrc/conf_mode/protocols_nhrp.py122
1 files changed, 122 insertions, 0 deletions
diff --git a/src/conf_mode/protocols_nhrp.py b/src/conf_mode/protocols_nhrp.py
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+++ b/src/conf_mode/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.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 tunnel_conf:
+ chain = f'VYOS_NHRP_{tunnel}_OUT_HOOK'
+ source_address = tunnel_conf['source_address']
+
+ chain_exists = run(f'sudo iptables --check {chain} -j RETURN') == 0
+ if not chain_exists:
+ run(f'sudo iptables --new {chain}')
+ run(f'sudo iptables --append {chain} -p gre -s {source_address} -d 224.0.0.0/4 -j DROP')
+ run(f'sudo iptables --append {chain} -j RETURN')
+ run(f'sudo iptables --insert OUTPUT 2 -j {chain}')
+
+ for tunnel in nhrp['del_tunnels']:
+ chain = f'VYOS_NHRP_{tunnel}_OUT_HOOK'
+ chain_exists = run(f'sudo iptables --check {chain} -j RETURN') == 0
+ if chain_exists:
+ run(f'sudo iptables --delete OUTPUT -j {chain}')
+ run(f'sudo iptables --flush {chain}')
+ run(f'sudo iptables --delete-chain {chain}')
+
+ 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)