1 files changed, 112 insertions, 0 deletions
diff --git a/src/conf_mode/dhcpv6_relay.py b/src/conf_mode/dhcpv6_relay.py
new file mode 100755
index 000000000..6ef290bf0
--- /dev/null
+++ b/src/conf_mode/dhcpv6_relay.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2018-2020 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 sys import exit
+from copy import deepcopy
+
+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'/run/dhcp-relay/dhcpv6.conf'
+
+default_config_data = {
+    'listen_addr': [],
+    'upstream_addr': [],
+    'options': [],
+}
+
+def get_config():
+    relay = deepcopy(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:
+            if conf.exists('listen-interface {0} address'.format(intf)):
+                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:
+            addresses = conf.return_values('upstream-interface {0} address'.format(intf))
+            for addr in addresses:
+                server = addr + '%' + intf
+                relay['upstream_addr'].append(server)
+
+    # 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
+
+    if len(relay['listen_addr']) == 0 or len(relay['upstream_addr']) == 0:
+        raise ConfigError('Must set at least one listen and upstream interface addresses.')
+
+    return None
+
+def generate(relay):
+    # bail out early - looks like removal from running config
+    if relay is None:
+        return None
+
+    render(config_file, 'dhcpv6-relay/config.tmpl', relay)
+    return None
+
+def apply(relay):
+    if relay is not None:
+        call('systemctl restart isc-dhcp-relay6.service')
+    else:
+        # DHCPv6 relay support is removed in the commit
+        call('systemctl stop isc-dhcp-relay6.service')
+        if os.path.exists(config_file):
+            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)
+        exit(1)