1 files changed, 120 insertions, 0 deletions
diff --git a/src/conf_mode/interfaces-vxlan.py b/src/conf_mode/interfaces-vxlan.py
new file mode 100755
index 000000000..47c0bdcb8
--- /dev/null
+++ b/src/conf_mode/interfaces-vxlan.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019-2020 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 netifaces import interfaces
+
+from vyos.config import Config
+from vyos.configdict import get_interface_dict
+from vyos.configverify import verify_address
+from vyos.configverify import verify_bridge_delete
+from vyos.configverify import verify_source_interface
+from vyos.ifconfig import VXLANIf, Interface
+from vyos import ConfigError
+from vyos import airbag
+airbag.enable()
+
+def get_config():
+    """
+    Retrive CLI config as dictionary. Dictionary can never be empty, as at least the
+    interface name will be added or a deleted flag
+    """
+    conf = Config()
+    base = ['interfaces', 'vxlan']
+    vxlan = get_interface_dict(conf, base)
+
+    # VXLAN is "special" the default MTU is 1492 - update accordingly
+    # as the config_level is already st in get_interface_dict() - we can use []
+    tmp = conf.get_config_dict([], key_mangling=('-', '_'), get_first_key=True)
+    if 'mtu' not in tmp:
+        vxlan['mtu'] = '1450'
+
+    return vxlan
+
+def verify(vxlan):
+    if 'deleted' in vxlan:
+        verify_bridge_delete(vxlan)
+        return None
+
+    if int(vxlan['mtu']) < 1500:
+        print('WARNING: RFC7348 recommends VXLAN tunnels preserve a 1500 byte MTU')
+
+    if 'group' in vxlan:
+        if 'source_interface' not in vxlan:
+            raise ConfigError('Multicast VXLAN requires an underlaying interface ')
+
+        verify_source_interface(vxlan)
+
+    if not any(tmp in ['group', 'remote', 'source_address'] for tmp in vxlan):
+        raise ConfigError('Group, remote or source-address must be configured')
+
+    if 'vni' not in vxlan:
+        raise ConfigError('Must configure VNI for VXLAN')
+
+    if 'source_interface' in vxlan:
+        # VXLAN adds a 50 byte overhead - we need to check the underlaying MTU
+        # if our configured MTU is at least 50 bytes less
+        underlay_mtu = int(Interface(vxlan['source_interface']).get_mtu())
+        if underlay_mtu < (int(vxlan['mtu']) + 50):
+            raise ConfigError('VXLAN has a 50 byte overhead, underlaying device ' \
+                              f'MTU is to small ({underlay_mtu} bytes)')
+
+    verify_address(vxlan)
+    return None
+
+
+def generate(vxlan):
+    return None
+
+
+def apply(vxlan):
+    # Check if the VXLAN interface already exists
+    if vxlan['ifname'] in interfaces():
+        v = VXLANIf(vxlan['ifname'])
+        # VXLAN is super picky and the tunnel always needs to be recreated,
+        # thus we can simply always delete it first.
+        v.remove()
+
+    if 'deleted' not in vxlan:
+        # VXLAN 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(VXLANIf.get_config())
+
+        # Assign VXLAN instance configuration parameters to config dict
+        for tmp in ['vni', 'group', 'source_address', 'source_interface', 'remote', 'port']:
+            if tmp in vxlan:
+                conf[tmp] = vxlan[tmp]
+
+        # Finally create the new interface
+        v = VXLANIf(vxlan['ifname'], **conf)
+        v.update(vxlan)
+
+    return None
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)