diff options
| -rw-r--r-- | interface-definitions/dhcpv6-relay.xml | 92 | ||||
| -rwxr-xr-x | src/conf_mode/dhcpv6_relay.py | 121 |
2 files changed, 213 insertions, 0 deletions
diff --git a/interface-definitions/dhcpv6-relay.xml b/interface-definitions/dhcpv6-relay.xml new file mode 100644 index 000000000..d6e6daf51 --- /dev/null +++ b/interface-definitions/dhcpv6-relay.xml @@ -0,0 +1,92 @@ +<?xml version="1.0"?> +<!-- DHCPv6 relay configuration --> +<interfaceDefinition> + <node name="service"> + <children> + <node name="dhcpv6-relay" owner="${vyos_conf_scripts_dir}/dhcpv6_relay.py"> + <properties> + <help>DHCPv6 Relay Agent parameters</help> + <priority>900</priority> + </properties> + <children> + <tagNode name="listen-interface"> + <properties> + <help>Interface for DHCPv6 Relay Agent to listen for requests</help> + <completionHelp> + <script>${vyos_completion_dir}/list_interfaces.py</script> + </completionHelp> + </properties> + <children> + <leafNode name="address"> + <properties> + <help>IPv6 address on listen-interface listen for requests on</help> + <valueHelp> + <format>ipv6</format> + <description>IPv6 address on listen interface</description> + </valueHelp> + <constraint> + <validator name="ipv6-address"/> + </constraint> + </properties> + </leafNode> + </children> + </tagNode> + <leafNode name="listen-port"> + <properties> + <help>UDP port to listen for requests on</help> + <valueHelp> + <format>1-65535</format> + <description>Port to listen on</description> + </valueHelp> + <constraint> + <validator name="numeric" argument="--range 1-65535"/> + </constraint> + <constraintErrorMessage>port must be a value between 1 and 65535</constraintErrorMessage> + </properties> + </leafNode> + <leafNode name="max-hop-count"> + <properties> + <help>Maximum hop count for which requests will be processed</help> + <valueHelp> + <format>1-255</format> + <description>Hop count (default: 10)</description> + </valueHelp> + <constraint> + <validator name="numeric" argument="--range 1-255"/> + </constraint> + <constraintErrorMessage>max-hop-count must be a value between 1 and 255</constraintErrorMessage> + </properties> + </leafNode> + <tagNode name="upstream-interface"> + <properties> + <help>Interface for DHCPv6 Relay Agent forward requests out</help> + <completionHelp> + <script>${vyos_completion_dir}/list_interfaces.py</script> + </completionHelp> + </properties> + <children> + <leafNode name="address"> + <properties> + <help>IPv6 address to forward requests to</help> + <valueHelp> + <format>ipv6</format> + <description>IPv6 address of the DHCP server</description> + </valueHelp> + <constraint> + <validator name="ipv6-address"/> + </constraint> + </properties> + </leafNode> + </children> + </tagNode> + <leafNode name="use-interface-id-option"> + <properties> + <help>Option to set DHCPv6 interface-ID option</help> + <valueless/> + </properties> + </leafNode> + </children> + </node> + </children> + </node> +</interfaceDefinition> diff --git a/src/conf_mode/dhcpv6_relay.py b/src/conf_mode/dhcpv6_relay.py new file mode 100755 index 000000000..982320d18 --- /dev/null +++ b/src/conf_mode/dhcpv6_relay.py @@ -0,0 +1,121 @@ +#!/usr/bin/env python3 +# +# Copyright (C) 2018 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 os +import jinja2 + +from vyos.config import Config +from vyos import ConfigError + +config_file = r'/etc/default/isc-dhcpv6-relay' + +# Please be careful if you edit the template. +config_tmpl = """ +### Autogenerated by dhcpv6_relay.py ### + +# Defaults for isc-dhcpv6-relay initscript sourced by /etc/init.d/isc-dhcpv6-relay + +OPTIONS="-6 -l {{ listen_addr | join('-l ') }} -p {{ port }} {{ options | join(' ') }} -u {{ upstream_addr | join('-u ') }}" +""" + +default_config_data = { + 'listen_addr': [], + 'upstream_addr': [], + 'port': '547', + 'options': [], +} + +def get_config(): + relay = default_config_data + conf = Config() + if not conf.exists('service dhcpv6-relay'): + return None + else: + conf.set_level('service dhcpv6-relay') + + # Network interfaces/address to listen on for DHCPv6 query(s) + if conf.exists('listen-interface'): + interfaces = conf.list_nodes('listen-interface') + for intf in interfaces: + addr = conf.return_value('listen-interface {0} address'.format(intf)) + listen = addr + '%' + intf + relay['listen_addr'].append(listen) + + # Upstream interface/address for remote DHCPv6 server + if conf.exists('upstream-interface'): + interfaces = conf.list_nodes('upstream-interface') + for intf in interfaces: + addr = conf.return_value('upstream-interface {0} address'.format(intf)) + server = addr + '%' + intf + relay['upstream_addr'].append(server) + + # Listen and transmit on port <xy>. This is mostly useful for debugging + # purposes. Default is port 67 for DHCPv4/BOOTP, or port 547 for DHCPv6. + if conf.exists('listen-port'): + relay['port'] = conf.return_value('listen-port') + + # Maximum hop count. When forwarding packets, dhcrelay discards packets + # which have reached a hop count of COUNT. Default is 10. Maximum is 255. + if conf.exists('max-hop-count'): + count = '-c ' + conf.return_value('max-hop-count') + relay['options'].append(count) + + if conf.exists('use-interface-id-option'): + relay['options'].append('-I') + + return relay + +def verify(relay): + # bail out early - looks like removal from running config + if relay is None: + return None + + return None + +def generate(relay): + # bail out early - looks like removal from running config + if relay is None: + return None + + tmpl = jinja2.Template(config_tmpl) + config_text = tmpl.render(relay) + with open(config_file, 'w') as f: + f.write(config_text) + + return None + +def apply(relay): + if relay is not None: + os.system('sudo systemctl restart isc-dhcpv6-relay.service') + else: + # DHCPv6 relay support is removed in the commit + os.system('sudo systemctl stop isc-dhcpv6-relay.service') + os.unlink(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) |