geneve: T1799: add Generic Network Virtualization Encapsulation

1 files changed, 150 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces-geneve.py b/src/conf_mode/interfaces-geneve.py
new file mode 100755
index 000000000..94f88ad6d
--- /dev/null
+++ b/src/conf_mode/interfaces-geneve.py
@@ -0,0 +1,150 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 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.configdict import list_diff
+from vyos.config import Config
+from vyos.ifconfig import GeneveIf, Interface
+from vyos.interfaces import get_type_of_interface
+from vyos import ConfigError
+from netifaces import interfaces
+
+default_config_data = {
+    'address': [],
+    'deleted': False,
+    'description': '',
+    'disable': False,
+    'intf': '',
+    'mtu': 1450,
+    'remote': ''
+}
+
+def get_config():
+    geneve = deepcopy(default_config_data)
+    conf = Config()
+
+    # determine tagNode instance
+    try:
+        geneve['intf'] = os.environ['VYOS_TAGNODE_VALUE']
+    except KeyError as E:
+        print("Interface not specified")
+
+    # Check if interface has been removed
+    if not conf.exists('interfaces geneve ' + geneve['intf']):
+        geneve['deleted'] = True
+        return geneve
+
+    # set new configuration level
+    conf.set_level('interfaces geneve ' + geneve['intf'])
+
+    # retrieve configured interface addresses
+    if conf.exists('address'):
+        geneve['address'] = conf.return_values('address')
+
+    # retrieve interface description
+    if conf.exists('description'):
+        geneve['description'] = conf.return_value('description')
+
+    # Disable this interface
+    if conf.exists('disable'):
+        geneve['disable'] = True
+
+    # Maximum Transmission Unit (MTU)
+    if conf.exists('mtu'):
+        geneve['mtu'] = int(conf.return_value('mtu'))
+
+    # Remote address of GENEVE tunnel
+    if conf.exists('remote'):
+        geneve['remote'] = conf.return_value('remote')
+
+    # Virtual Network Identifier
+    if conf.exists('vni'):
+        geneve['vni'] = conf.return_value('vni')
+
+    return geneve
+
+
+def verify(geneve):
+    if geneve['deleted']:
+        # bail out early
+        return None
+
+    if not geneve['remote']:
+        raise ConfigError('GENEVE remote must be configured')
+
+    if not geneve['vni']:
+        raise ConfigError('GENEVE VNI must be configured')
+
+    return None
+
+
+def generate(geneve):
+    return None
+
+
+def apply(geneve):
+    # Check if GENEVE interface already exists
+    if geneve['intf'] in interfaces():
+        v = GeneveIf(geneve['intf'])
+        # GENEVE is super picky and the tunnel always needs to be recreated,
+        # thus we can simply always delete it first.
+        v.remove()
+
+    if not geneve['deleted']:
+        # GENEVE interface needs to be created on-block
+        # instead of passing a ton of arguments, I just use a dict
+        # that is managed by vyos.ifconfig
+        conf = deepcopy(GeneveIf.get_config())
+
+        # Assign GENEVE instance configuration parameters to config dict
+        conf['vni'] = geneve['vni']
+        conf['remote'] = geneve['remote']
+
+        # Finally create the new interface
+        v = GeneveIf(geneve['intf'], config=conf)
+        # update interface description used e.g. by SNMP
+        v.set_alias(geneve['description'])
+        # Maximum Transfer Unit (MTU)
+        v.set_mtu(geneve['mtu'])
+
+        # Configure interface address(es) - no need to implicitly delete the
+        # old addresses as they have already been removed by deleting the
+        # interface above
+        for addr in geneve['address']:
+            v.add_addr(addr)
+
+        # As the bond interface is always disabled first when changing
+        # parameters we will only re-enable the interface if it is not
+        # administratively disabled
+        if not geneve['disable']:
+            v.set_state('up')
+
+    return None
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)